ISSN e: 2007-4018 / ISSN print: 2007-4018

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Vol. XXIII, issue 1 January - April 2017

ISSN: ppub: 2007-3828 epub: 2007-4018

Scientific article

Analysis of land use change in an urban ecosystem in the drainage area of the Grijalva river, Mexico

http://dx.doi.org/10.5154/r.rchscfa.2016.03.018

Palomeque-De la Cruz, Miguel Á. 1 ; Galindo-Alcántara, Adalberto 1 * ; Escalona-Maurice, Miguel J. 2 ; Ruiz-Acosta, Silvia del C. 3 ; Sánchez-Martínez, Alberto J. 1 ; Pérez-Sánchez, Eunice 1

  • 1Universidad Juárez Autónoma de Tabasco, División Académica de Ciencias Biológicas. km 0.5 carretera Villahermosa-Cárdenas entronque a Bosques de Saloya. C. P. 86150. Villahermosa Tabasco, México.
  • 2Colegio de Postgraduados, Campus Montecillo. km 36.5 carretera México-Texcoco. C. P. 56230. Montecillo, Texcoco, Estado de México, México.
  • 3Instituto Tecnológico de la Zona Olmeca. Prolongación Ignacio Zaragoza s/n. C. P. 86720. Villa Ocuiltzapotlán, Centro, Tabasco. México.

Corresponding author. Email: aga2003a@hotmail.com

Received: March 31, 2016; Accepted: November 09, 2016

This is an open-access article distributed under the terms of the Creative Commons Attribution License view the permissions of this license

Abstract

The land use change was analyzed based on the effect of the urban growth of Villahermosa city, Tabasco, on arboreal vegetation and aquatic ecosystems. A multitemporal analysis was carried out using the Land Change Modeler for Ecological Sustainability and the CrossTab module of IDRISI Selva® software and change rates were calculated. According to the results, for almost three decades (1984-2008), a total of 4,008 ha of land occupied by arboreal vegetation and 289 ha of wetland were lost, due to the accelerated growth of grasslands and urban areas. Stochastic transition models (Markov chains and cellular automata) projected a loss of 1,171 ha of arboreal vegetation and 247 ha of wetland between 2008 and 2030. This trend is likely to be sustained by the relentless growth of grassland and urban area.

Keywords:Woodlands; wetlands; urban growth; Markov chain; cellular automata.

Introduction

Urbanization, one of the main socio-environmental processes, is conceptualized in general terms as the transformation of land into urban environments (Angeoletto et al., 2015). Urbanization causes desertification, deforestation, loss of biodiversity and emission of greenhouse gases that contribute to climate change. Land change by urban growth accounts for about 47 % of the planet, only Africa accounts for 65 % of the world’s degraded soil (Biro, Pradhan, Buchroithner, & Makeschin, 2013). In Europe and Asia, land use change has contributed to landscape fragmentation, and in America, large forest coverages have been lost and about 50 % of wetland areas have disappeared (Mitsch, Goseelink, & Anderson, 2009).

Forests, deserts and wetlands near urban ecosystems are deteriorating in Mexico; for example, in Mexico City, an extensive area of natural reserves has become an urban area and more than 30 % of wetlands have disappeared (Torres‐Vera, Prol‐Ledesma, & García‐ López, 2009; Zepeda-Gómez, Nemiga, Lot-Helgueras, Madrigal-Uribe, 2012). In the decade of the 70’s, the beginning of the oil boom was added to the economic impulse and consequent urban growth in the southeastern cities of the country, including Villahermosa (Bazant, 2010). In this field, from 1993 to 2007, the forest area decreased from 36 to 9 % in the basin of Grijalva-Usumacinta (Kolb & Galicia 2012). The loss of vegetation and wetland cover in the basin has been linked to city growth, deforestation for livestock use, and logging and oil exploitation (Kolb, Mas, & Galicia, 2013; Perevochtchikova & Lezama, 2010). In the case of Villahermosa, urban expansion was based on the filling and fragmentation of wetlands (Díaz-Perera, 2014).

The basin of the rivers Grijalva-Usumacinta, located in the coastal plain of the southern Gulf of Mexico, covers 91,345 km2 and represents 4.7 % of the country (Comisión Nacional del Agua [CONAGUA], 2012). Since the seventeenth century, the low drainage area of the basin of the Grijalva River has been transformed by agricultural activities and modifications to the river network (Navarro & Toledo, 2004; Salazar, 2002). Since 1970, land use change has altered natural flood cycles, with consequent disruption of water volumes in rivers and areas of temporary flooding, biogeochemical cycles and trophic dynamics of wetlands, leading to fragmentation and loss of habitat, as well as to the decline of biodiversity and society-environment relations (Pinkus-Rendón & Contreras-Sánchez, 2012; Sánchez et al., 2015).

The city of Villahermosa, capital of the state of Tabasco, is one of the four most important urban ecosystems in the drainage zone of the Grijalva River.

The presence of economic activities such as agriculture and oil exploitation, has allowed it to maintain the state’s political status. Villahermosa has 13 riverine lagoon ecosystems related to the surrounding rivers of Mezcalapa Viejo, Carrizal and Sierra-Grijalva (Sánchez-Colón, Flores- Martínez, Cruz-Leyva, & Velázquez, 2009). The model of excessive growth of the urban ecosystem is associated with the modification of the physiography and the increase of the vulnerability of the floods. In adjacent urban and suburban areas, both wetlands and their temporary floodplains or associated marshes were dried up, rivers changed, floodplains were devastated and forests were deforested (CONAGUA, 2012). However, the lack of data on the measurement of changes in tree cover and wetlands still exists, despite the fact that this information is relevant to support models of land use change that allow to mitigate their loss or seek rehabilitation to restore environmental services and benefits.

The spatial-temporal dynamics estimates the distribution of the change of natural coverages and artificial uses to identify those that show greater environmental pressure (Velázquez et al., 2002); therefore, the study of dynamics is very important for environmental impact assessment and for environmental planning strategies. Land-use change modelers, Markov chains and cellular automata are useful transition models for detecting the factors and consequences involved in land-use change, and predicting spatial scenarios (Eastman, 2012; Reynoso-Santos, Valdez-Lazalde, Escalona-Maurice, De los Santos-Posadas, & Pérez-Hernández, 2016).

The aim of this study was to evaluate the spatial-temporal dynamics in the city of Villahermosa during the period 1984-2008, to estimate the distribution of arboreal vegetation and wetlands. These coverages were selected because they are subject to greater environmental pressure due to urban growth. Based on this, a prospective scenario (2030) based on Markov chains and cellular automata was built.

Materials and methods

Study area

The study was carried out at the boundary of urban influence of the city of Villahermosa (92° 55’ O and 17° 59’ N), which has an area of 20,655 ha and is located in the lower part of the drainage zone of the Grijalva river. The river of the Sierra drains by the east and the carrizal River borders the north. The city has an average height of 10 m and a minimum relief dominated by low floodplain areas and some hills in the East (CONAGUA, 2012).

Database development

Thematic layers of land use were created in vector format in 1984, 2000 and 2008 (1: 75,000, 1: 20,000, 1: 10,000), digitized from black and white aerial photographs using ArcGis® 10.2.2 software (Environmental Systems Research Institute [ESRI], 2016). In order to correct inconsistencies in the pixel size, a transformation was made by means of cartographic restitution (RMS < 0.5, WGS 84), based on the image of 2008 and using the PCI Geomatics® V9.1 software (PCI Geomatics Enterprises, 2003). A total of seven categories of land use were established: (1) arboreal vegetation, (2) wetlands, (3) grassland, (4) wasteland, (5) industrial land, (6) roads and (7) urban land. Along with the digitization, a field study was carried out to verify the defined classes.

Land Use Change Analysis

The multitemporal analysis was performed using the Land Change Modeler for Ecological Sustainability and the CrossTab module of the IDRISI Selva® software, generating a cross tabulation matrix (Eastman, 2012). The periods considered covered from 1984 to 2000 and from 2000 to 2008. The matrices obtained were validated with the Kappa statistic (K) = 0.8963 (1984- 2000) and Kappa (K) = 0.9033 (2000-2008), close to 1.0000, generating a reliable analysis of spatial dynamics. The results include the summary of the matrices showing the surface of each category in comparison with others, in terms of gains, losses and contributions among categories (Eastman, 2012).

Change rates

Land use change rates were calculated using the formula of Palacio-Prieto et al.(2004):

Td = [(S2 / S1) (1 / n) -1] * 100

Projection of land use change (2030)

The probabilities and spatial scenarios of land use change were projected using the combined techniques of transition models: Markov chains and cellular automata. Markov chains were used to calculate the probability of change from one pixel to another and to generate a transition probability matrix and a transition area matrix (Eastman, 2012; Reynoso-Santos et al., 2016). For this calculation, the land use maps of 1984 (Figure 1) and of 2008 (Figure 2) were used, and the MARKOV module of IDRISI Selva® software was used, regarding a 22 year interval (2030). The result was a transition probability matrix and a matrix of transition areas, with a collection of maps representing transition areas for the seven land use categories in 2030.

Figure 1. Land use map of the city of Villahermosa, Tabasco (1984). Scale 1:10,000.

Figure 2. Land use map of the city of Villahermosa, Tabasco (2008). Scale 1:10,000.

Subsequently, the map of 2008 (Figure 2), the transition matrix and the collection of maps of transition areas of 2030, generated with MARKOV, were used as variables to run the cellular automata module (CA-MARKOV) of the software IDRISI Selva® (Eastman, 2012; Reynoso- Santos et al., 2016), to generate the map of 2030 (Figure 3). The suitability of the model was evaluated through a comparison of similarity between the image of 2008 and the projected map of 2030, using the VALIDATE module. The Kappa statistic indicated that Standard K = 0.9081, Kno = 0.9488 and Klocalition = 0.9630 were close to 1.0000; showing precision for the scenarios building. Both images were intersected in the Land Change Modeler and CrossTab modules to obtain the change matrices; thus, gain, loss and contribution between coverages for the map of 2008 and the scenario of 2030 were calculated.

Figure 3. Land use map of the city of Villahermosa (projection 2030). Scale 1:10,000.

Results and discussion

Change analysis of 1984-2000-2008

Table 1 reports the land use areas and change rates by period analyzed. Land use in 1984 was distributed as follows: 44.5 % of the land was occupied by grassland, while 28.6 % and 12.3 % corresponded to arboreal vegetation and wetlands, respectively. By contrast, the urban area occupied 10.6 % of the territory. Figure 1 shows the land use map in Villahermosa of that year, in which it is observed that most of the arboreal vegetation was close to aquatic ecosystems in non-urbanized areas.

Table 1. Land use change and change rate (CR) in Villahermosa, Tabasco.

Category Area 1984 2000 2008 Projection 2030 Period 1984-2000 Period 2000-2008 Period 1984-2008 Period 2008-2030
Area (ha) Area (%) Area (ha) Area (%) Area (ha) Area (%) Area (ha) Area (%) Area (ha) CR (%) Area (ha) CR (%) Area (ha) CR (%) Area (ha)
Arboreal vegetation 5,901 28.6 3,517 17 1,893 9.2 722 3.5 2,384 -3.18 1,624 -7.45 4,008 -4.63 1,171
Wetlands 2,533 12.3 2,457 11.9 2,244 10.9 1,997 9.7 76 -0.19 213 -1.13 289 -0.50 247
Grassland 9,192 44.5 10,699 51.8 11,239 54.4 10,922 52.9 -1,507 0.95 -540 0.62 -2,047 0.84 317
Wastelands 465 2.2 407 2 203 1 84 0.4 58 -0.82 204 -8.36 262 -3.40 119
Industrial land 10 0.05 64 0.3 184 0.9 325 1.6 -54 12.17 -120 14.08 -174 12.81 -141
Roads 373 1.8 387 1.9 435 2.1 476 2.3 -14 0.24 -48 1.46 -62 0.65 -41
Urban land 2,182 10.6 3,124 15.1 4,458 21.6 6,137 29.7 -942 2.27 -1334 4.55 -2,276 3.02 -1,679
Total 20,655 100 20,655 100 20,655 100 20,655 100

In the first period of analysis (1984-2000), arboreal vegetation lost 2,384 ha with a high rate of change of -3.18 %; wetlands lost 76 ha with a change rate of -0.19 %. In contrast, grassland and urban area increased by 1,507 and 942 ha, with change rates of 0.95 and 2.27 %, respectively. Sánchez-Munguía (2005) found that in Tabasco, from 1950 to 2000, about 83,518 ha of wetlands had been lost at a rate of 3,341 ha∙year-1 and that in Villahermosa, the urban advance of 2,296 ha between 1990 and 2000 invaded lagoons and marshes, and freshwater wetlands and cattatil vegetation that functioned as regulating vessels, were removed.

In the period of 2000-2008, the loss of areas of arboreal vegetation (1,624 ha) and wetlands (213 ha) increased compared to the previous period, with wide change rates (-7.45 and -1.13 %, respectively), while grassland (540 ha) and urban areas (1,334 ha) continued to occupy more area, with change rates of 0.62 and 1.46 %, respectively (Table 1).

During the 24 years (1984-2008), arboreal vegetation and wetlands lost 4,008 and 289 ha, respectively. In contrast, grassland and urban areas increased by 2,047 and 2,276 ha (Table 1), respectively, being the greatest impacts of the last three decades reflected in their spatial-temporal dynamics. In the period 1984-2008, the rate of land use change of the arboreal vegetation was of -4.63 %, being greater than that recorded in the Grijalva-Usumacinta basin and country. Kolb and Galicia (2012) observed that the rate of deforestation in the Grijalva-Usumacinta basin was 0.90 % during 1993 and 2007, and reports from the FAO (Food and Agriculture Organization of the United Nations, 2015) reported deforestation rates of -0.3 % in Mexico during 1990 and 2015.

The analysis of land use change shows that Villahermosa is expanding uncontrollably in the face of poor sustainable development, from being a compact city it transformed into a sectorial perimeter and then into a fragmented city, which is common in Latin American cities (Bähr & Borsdorf, 2005). The city shows a growth pattern associated with industrialization, land use regulations, regional economy, population movements, demand for agricultural products and political environment providing total control to the real estate sector and socio-cultural processes (Kolb et al., 2013 Linard, Tatem, & Gilbert, 2013). The territory also has the influence of the relief, the low slope and the roads that facilitate the establishment of new population centers that demand urban infrastructure (Gutiérrez, Condeço-Melhorado, & Martín, 2010; Kolb et al., 2013).

Table 2 reports the losses and gains of surface of the seven categories analyzed in the periods of 1984-2000 and 2000-2008. In the period of 1984-2000, arboreal vegetation gained 0.08 % of its surface area, but it was the category that provided more areas (3.65 %) to other land uses. Grasslands and the urban area were the categories that gained more areas (3.31 and 1.44 %, respectively), although the former also lost 1.05 %, while the latter showed no loss. Of the total wetland area, 0.18 % changed to other uses, while roads gained 0.03 % of their area. Between 2000 and 2008, the pressure on wetlands intensified, as their area decreased by 0.74 %. Similarly, grassland loss (3.31 %) was higher, although 2.26 % of its area was restored. The arboreal vegetation lost 2.61 %, while other categories such as industrial land, roads and urban land recorded an overall growth equivalent to 2.27 % of the surface.

Table 2. Loss and gain of area (1984-2000 and 2000-2008) per category analyzed in Villahermosa, Tabasco.

Category Area 1984 Area 2000 Gains Losses
(ha) (ha) (ha) (%) (ha) (%)
Arboreal vegetation 5,901 3,517 51 0.08 -2,436 -3.65
Wetlands 2,533 2,457 41 0.06 -117 -0.18
Grassland 9,192 10,699 2,210 3.31 -703 -1.05
Wasteland 465 407 83 0.12 -140 -0.21
Industrial land 10 64 54 0.08 0 0
Roads 373 387 19 0.03 -5 -0.01
Urban land 2,182 3,124 959 1.44 -17 -0.03
Category Area 2000 Area 2008 Gains Losses
(ha) (ha) (ha) (%) (ha) (%)
Arboreal vegetation 3,517 1,893 116 0.17 -1,741 -2.61
Wetlands 2,457 2,244 0 0 -215 -0.74
Grassland 10,699 11,239 1,507 2.26 -967 -3.31
Wasteland 407 203 22 0.03 -226 -0.78
Industrial land 64 184 121 0.18 -1 0
Roads 388 435 54 0.08 -6 -0.01
Urban land 3,124 4,458 1,343 2.01 -8 -0.01

Table 3 shows the surface contributions among the seven categories in the two periods evaluated. In the first period (1984-2000), 38 ha of arboreal vegetation were transformed into wetlands and 2,011 ha into grassland. In addition, another 306 ha of arboreal vegetation contributed to the growth of urban areas, industrial areas and roads, and only 29 ha remained as wasteland. Although wetlands gained 38 ha of arboreal vegetation, they gave 113 ha to the grasslands. This last category added another 2,011 ha coming from the arboreal vegetation, but lost 528 ha because of the growth of urban areas, industrial areas and roads. The urban area required 288 ha, 528 ha and 123 ha of arboreal vegetation, grassland and wasteland, respectively. In the second period (2000-2008), arboreal vegetation continued to provide areas to grassland (1,252 ha) and urban area (424 ha). On the other hand, due to the reforestation, arboreal vegetation recovered 77 ha coming from wasteland. The negative trend of the wetlands was maintained by contributing another 212 ha to grassland. This last category expanded with 1,252 ha of arboreal vegetation, although it reduced 102 ha due to the increase of the industrial area. In these eight years, 424 ha of arboreal vegetation, 762 ha of grassland and 141 ha of wasteland were urbanized.

Table 3. Surface contributions (1984-2000 and 2000-2008) among categories analyzed in Villahermosa, Tabasco.

Contributions 1984-2000 (ha) Contributions 2000-2008 (ha)
Category Arboreal vegetation Wetlands Grassland Urban land Category Arboreal vegetation Wetlands Grassland Urban land
Arboreal vegetation 0 38 2,011 288 Arboreal vegetation 0 0 1,252 424
Wetlands -38 0 113 0 Wetlands 0 0 212 0
Grassland -2,011 -113 0 528 Grassland -1,252 -212 0 762
Wasteland -29 0 -39 123 Wasteland 77 0 -14 141
Industrial land -13 0 -41 0 Industrial land -19 0 -102 1
Roads -5 -1 -11 3 Roads -5 0 -48 6
Urban land -288 0 -528 0 Urban land -424 0 -762 0

In this study, deforestation and drastic reduction of wetlands were primarily caused by the transition to grassland for agricultural use and secondly by urbanization. These results agree with Zavala et al. (2009), who found that agricultural activities (60 %), especially grassland for livestock cattle, and urban areas (9.1 %) were dominant in Villahermosa. In the same study, the authors pointed out that 74 % of the landscape was transformed in the years 1984 and 2005 and that areas with arboreal vegetation and the wetlands occupied 25.3 and 5.2 % of the urban territory, respectively.

Between 1940-1996, 95 % of Tabasco forests were lost, due to the increase of areas for agricultural and livestock activities (Zavala & Castillo, 2007). Sánchez-Munguía (2005) analyzed the land use in Tabasco for the period of 1950-2000 and reported that the forest area distributed in ejidos and private property was 538,861 ha in 1950; 10 years later, the area of natural vegetation decreased to 453,411 ha; and in 1970 an accelerated deforestation initiated, leaving 146,485 ha of forest, which were reduced to 71,387 ha in 1980 and 41,079 in 1990. This decrease meant that, in 40 years, forests changed from representing 21.7 % to 1.6 % of the state area. Sánchez- Munguía (2005) linked deforestation between 1950 and 1991 with the increase in the number of heads of cattle, which was the economic activity that replaced the export of banana and other agricultural products before the oil boom (Allub & Michel, 1979).

The trend of land-use change agrees with other studies (Kolb & Galicia, 2013; Perezechchikova & Lezama, 2010; Sánchez-Munguía, 2005; Zavala & Castillo, 2007; Zavala et al., 2009) regarding the replacement of arboreal vegetation and wetlands cover by grassland and urban use; however, different surfaces and rates of change are detected due to the periods of analysis, evaluation methods and study scales. Velázquez et al. (2002) pointed out that the approaches used for the analysis of land use change are not homogeneous and, therefore, the results of different studies are varied in mapping categories and study scales. Thus, in order to compare with greater accuracy and reliability the dynamics of the different ecosystems in Mexico, it is necessary to systematize the mechanisms of evaluation, prediction and monitoring with compatible databases in categories and study scales.

Although the land use change modeler detected the accelerated growth of grassland for agricultural use against the declining of arboreal vegetation and wetlands, Sánchez-Munguía (2005) mentioned that in the last decades, there was a notable abandonment of agricultural activity in the territory, reflected in the collapse of the slaughter of cattle in the Frigorífico of Villahermosa. In spite of the decrease of this activity, the transition from grassland to arboreal vegetation by natural regeneration was not recorded; in contrast, only small reforested areas were located. Soil erosion in the Grijalva-Usumacinta basin may explain the lack of natural restoration, as 47.64 % of the area has slopes of more than 8 degrees (Sánchez-Hernández, Mendoza- Palacios, De la Cruz-Reyes, Mendoza-Martínez, & Ramos-Reyes, 2013).

In Tabasco, wetlands have deteriorated due to increased grassland, urban infrastructure and the construction of industrial areas and roads (Estrada, Barba, & Ramos, 2013), despite the fact that such coverage is valued as environmental regulators, flood damping, ecosystems hosting high biodiversity and habitat for resident and migratory species (Henny & Meutia, 2014; Hettiarachchi et al., 2014). With regard to the contamination of wetlands, the discharge of chemical products and the contribution of sediments derived from urban developments have led to hypertrophic conditions since the beginning of the 1990s (Goñi-Arévalo, Hernández- Pérez, Toledo-Gómez, & Pérez, 1991). These conditions have increased in Villahermosa (Hansen, Van Afferden, & Torres-Bejarano, 2007; Sánchez et al., 2012) and in other urban and coastal areas of the basin (Salcedo, Sánchez, De la Lanza, Kamplicher, & Florido, 2012).

Projection of the probabilities of land use change (2030)

By 2030, the replacement of arboreal vegetation by grasslands recorded 0.52 probability, which was followed by 0.13 related to urban growth (Table 4). In this sense, wetlands will disappear to become grasslands with a probability of 0.11; however, grassland will in turn be replaced by the urban area with a probability index of 0.11 (Table 4). Wasteland have a probability of 0.18 of transforming into arboreal vegetation, because these are places suitable for reforestation; however, wasteland will decrease by the growth of the urban area (probability of 0.45).

Table 4. Matrix of land use transition probabilities for 2030 in Villahermosa, Tabasco.

Category Arboreal vegetation Wetlands Grassland Wasteland Industrial land Roads Urban land
Arboreal vegetation 0.321 0.004 0.522 0.004 0.005 0.003 0.137
Wetlands 0.000 0.882 0.116 0.000 0.000 0.000 0.000
Grassland 0.005 0.000 0.856 0.002 0.013 0.004 0.117
Wasteland 0.184 0.000 0.000 0.356 0.000 0.004 0.454
Industrial land 0.000 0.000 0.000 0.000 1.000 0.000 0.000
Roads 0.000 0.000 0.002 0.000 0.000 0.973 0.024
Urban land 0.000 0.000 0.000 0.000 0.000 0.000 0.999

It was detected that the arboreal vegetation and the wetlands will decrease 1,187 and 254 ha, respectively with the model of cellular automata. In contrast, grassland will apparently increase 1,114 ha, as it will lose 1,431 ha. The urban area will continue to accumulate area and will add 6,137 ha in 2030 (Table 5). The contributions between coverages from 2008 to 2030 (Table 6) predicted that the arboreal vegetation will lose 860 ha when replaced by grassland; moreover, 254 ha of wetlands will be transformed into grassland. Likewise, for its imminent expansion, the urban area will invade 316 ha of arboreal vegetation and 1,252 ha of wetlands.

Table 5. Losses and gains of area in the period 2008-2030 in Villahermosa, Tabasco, according to the model of cellular automata.

Category Area 2008 Area 2030 Gains Losses
(ha) (%) (ha) (%) (ha) (%) (ha) (%)
Arboreal vegetation 1,893 9.2 722 3.5 16 0.02 -1,187 -1.78
Wetlands 2,244 10.9 1,997 9.7 7 0.01 -254 -0.38
Grassland 11,239 54.4 10,922 52.9 1,114 1.67 -1431 -2.14
Wasteland 203 1 84 0.4 0 0 -121 -0.018
Industrial land 184 0.9 325 1.6 137 0.2 0 0
Roads 435 2.1 476 2.3 42 0.06 0 0
Urban land 4,458 21.6 6,137 29.7 1,679 2.51 0 0

Table 6. Surface contributions between categories for the period 2008-2030 in Villahermosa, Tabasco.

Category / Categoría Arboreal vegetation (ha) / Vegetación arbórea(ha) Wetlands (ha) / Humedales (ha) Grassland (ha) / Pastizal (ha) Wasteland (ha) / Terrenos baldíos (ha)
Arboreal vegetation / Vegetación arbórea 0 7 860 316
Wetlands / Humedales -7 0 254 0
Grassland / Pastizal -860 -254 0 1,258
Wasteland / Terrenos baldíos 16 0 0 104
Industrial land / Industrial -4 0 -132 0
Roads / Carreteras 0 0 -41 0
Urban land / Urbano -316 0 -1,252 0

The land-use change model, Markov chains and cellular automata accurately detected the distribution of natural coverages and artificial uses, probabilities and spatial projection of change for year 2030, providing useful information for environmental planning for the city of Villahermosa. Jiménez-Moreno, González- Guillén, Escalona-Maurice, Valdez-Lazalde and Aguirre- Salado (2011) mentioned that it is essential to use one or several models of land use change so that soil authorities and planners can understand the scope of the changes recorded and the risks involved. In addition, the changes recorded allow to identify the factors that are causing them and, therefore, are useful to follow the territorial order.

Conclusions

Urban growth has been characterized by the development of urban and industrial surfaces in natural areas, especially wetlands. In the period analyzed, the urban area increased by almost 5,000 ha, causing a double risk; on the one hand, the loss of natural areas, and on the other hand, perhaps more important, is that it represents high probabilities of flooding for the population settled in this area. Meanwhile, foresight indicates that the loss of natural resources, and in particular of wetlands, will progressively continue to exceed more than 1,000 ha if there is no significant change in the paradigm or a program of land use management. This means that a significant part of the damage to infrastructure and economy due to recurrent floods in the urban area of the low basin is not necessarily a result of surplus precipitation, but instead the damage responds to the loss of wetlands and their use change to become residential areas. Therefore, to avoid scenarios of environmental deterioration in the next two decades, it is necessary to protect the territory with a comprehensive management plan and a legal decree to back it up.

Acknowledgements

  • The authors thank the Consejo Nacional de Ciencia y Tecnología for the scholarship awarded for Ph.D. studies in Ecology and Tropical Systems Management (PNPC), and the Colegio de Postgraduados Campus Montecillos for training on geomatic models for the analysis of land use change.

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Figures:

Figure 1. Land use map of the city of Villahermosa, Tabasco (1984). Scale 1:10,000.
Figure 2. Land use map of the city of Villahermosa, Tabasco (2008). Scale 1:10,000.
Figure 3. Land use map of the city of Villahermosa (projection 2030). Scale 1:10,000.

Tables:

Table 1. Land use change and change rate (CR) in Villahermosa, Tabasco.
Category Area 1984 2000 2008 Projection 2030 Period 1984-2000 Period 2000-2008 Period 1984-2008 Period 2008-2030
Area (ha) Area (%) Area (ha) Area (%) Area (ha) Area (%) Area (ha) Area (%) Area (ha) CR (%) Area (ha) CR (%) Area (ha) CR (%) Area (ha)
Arboreal vegetation 5,901 28.6 3,517 17 1,893 9.2 722 3.5 2,384 -3.18 1,624 -7.45 4,008 -4.63 1,171
Wetlands 2,533 12.3 2,457 11.9 2,244 10.9 1,997 9.7 76 -0.19 213 -1.13 289 -0.50 247
Grassland 9,192 44.5 10,699 51.8 11,239 54.4 10,922 52.9 -1,507 0.95 -540 0.62 -2,047 0.84 317
Wastelands 465 2.2 407 2 203 1 84 0.4 58 -0.82 204 -8.36 262 -3.40 119
Industrial land 10 0.05 64 0.3 184 0.9 325 1.6 -54 12.17 -120 14.08 -174 12.81 -141
Roads 373 1.8 387 1.9 435 2.1 476 2.3 -14 0.24 -48 1.46 -62 0.65 -41
Urban land 2,182 10.6 3,124 15.1 4,458 21.6 6,137 29.7 -942 2.27 -1334 4.55 -2,276 3.02 -1,679
Total 20,655 100 20,655 100 20,655 100 20,655 100
Table 2. Loss and gain of area (1984-2000 and 2000-2008) per category analyzed in Villahermosa, Tabasco.
Category Area 1984 Area 2000 Gains Losses
(ha) (ha) (ha) (%) (ha) (%)
Arboreal vegetation 5,901 3,517 51 0.08 -2,436 -3.65
Wetlands 2,533 2,457 41 0.06 -117 -0.18
Grassland 9,192 10,699 2,210 3.31 -703 -1.05
Wasteland 465 407 83 0.12 -140 -0.21
Industrial land 10 64 54 0.08 0 0
Roads 373 387 19 0.03 -5 -0.01
Urban land 2,182 3,124 959 1.44 -17 -0.03
Category Area 2000 Area 2008 Gains Losses
(ha) (ha) (ha) (%) (ha) (%)
Arboreal vegetation 3,517 1,893 116 0.17 -1,741 -2.61
Wetlands 2,457 2,244 0 0 -215 -0.74
Grassland 10,699 11,239 1,507 2.26 -967 -3.31
Wasteland 407 203 22 0.03 -226 -0.78
Industrial land 64 184 121 0.18 -1 0
Roads 388 435 54 0.08 -6 -0.01
Urban land 3,124 4,458 1,343 2.01 -8 -0.01
Table 3. Surface contributions (1984-2000 and 2000-2008) among categories analyzed in Villahermosa, Tabasco.
Contributions 1984-2000 (ha) Contributions 2000-2008 (ha)
Category Arboreal vegetation Wetlands Grassland Urban land Category Arboreal vegetation Wetlands Grassland Urban land
Arboreal vegetation 0 38 2,011 288 Arboreal vegetation 0 0 1,252 424
Wetlands -38 0 113 0 Wetlands 0 0 212 0
Grassland -2,011 -113 0 528 Grassland -1,252 -212 0 762
Wasteland -29 0 -39 123 Wasteland 77 0 -14 141
Industrial land -13 0 -41 0 Industrial land -19 0 -102 1
Roads -5 -1 -11 3 Roads -5 0 -48 6
Urban land -288 0 -528 0 Urban land -424 0 -762 0
Table 4. Matrix of land use transition probabilities for 2030 in Villahermosa, Tabasco.
Category Arboreal vegetation Wetlands Grassland Wasteland Industrial land Roads Urban land
Arboreal vegetation 0.321 0.004 0.522 0.004 0.005 0.003 0.137
Wetlands 0.000 0.882 0.116 0.000 0.000 0.000 0.000
Grassland 0.005 0.000 0.856 0.002 0.013 0.004 0.117
Wasteland 0.184 0.000 0.000 0.356 0.000 0.004 0.454
Industrial land 0.000 0.000 0.000 0.000 1.000 0.000 0.000
Roads 0.000 0.000 0.002 0.000 0.000 0.973 0.024
Urban land 0.000 0.000 0.000 0.000 0.000 0.000 0.999
Table 5. Losses and gains of area in the period 2008-2030 in Villahermosa, Tabasco, according to the model of cellular automata.
Category Area 2008 Area 2030 Gains Losses
(ha) (%) (ha) (%) (ha) (%) (ha) (%)
Arboreal vegetation 1,893 9.2 722 3.5 16 0.02 -1,187 -1.78
Wetlands 2,244 10.9 1,997 9.7 7 0.01 -254 -0.38
Grassland 11,239 54.4 10,922 52.9 1,114 1.67 -1431 -2.14
Wasteland 203 1 84 0.4 0 0 -121 -0.018
Industrial land 184 0.9 325 1.6 137 0.2 0 0
Roads 435 2.1 476 2.3 42 0.06 0 0
Urban land 4,458 21.6 6,137 29.7 1,679 2.51 0 0
Table 6. Surface contributions between categories for the period 2008-2030 in Villahermosa, Tabasco.
Category / Categoría Arboreal vegetation (ha) / Vegetación arbórea(ha) Wetlands (ha) / Humedales (ha) Grassland (ha) / Pastizal (ha) Wasteland (ha) / Terrenos baldíos (ha)
Arboreal vegetation / Vegetación arbórea 0 7 860 316
Wetlands / Humedales -7 0 254 0
Grassland / Pastizal -860 -254 0 1,258
Wasteland / Terrenos baldíos 16 0 0 104
Industrial land / Industrial -4 0 -132 0
Roads / Carreteras 0 0 -41 0
Urban land / Urbano -316 0 -1,252 0