This paper describes the guarijios´s agricultural systems of the ejido Burapaco: mahuechi, verano and garden (m-v-g); and small irrigation systems in the Mayo´s middle river basin, Alamos, Sonora. The aim is to gather traditional ecological knowledge of agricultural systems and products for own consumption as food, medicine, rituals products for the reproduction of their material life among other uses. The importance of rescuing such information due to the imminent construction of the dam project Dam Bicentenario Los Pilares, 41 km upstream of the dam Adolfo Ruiz Cortines, to provide water and flood control to the Irrigation District 038 of the Mayo river in Alamos, Sonora. One of the negative impacts is the loss of traditional ecological knowledge,

The investigation on tree diversity was carried out in the town of San Vicente Yogondoy, Pochutla, Oaxaca, Mexico. This town is known for its coffee production related to 65 shade tree species. The aim of the investigation was to learn and measure the richness of the diversity of trees in coffee agro ecosystems. Another aim was to generate information on the utility of these systems as water basins, biodiversity reservoirs, lumber, income and food for the population, and others. For this purpose, we identified and measured trees in 10m2 quadrants in a total of 17 organic coffee plots out of a total of (40%) selected at random. The altitudinal gradient in which the plots are located is between1 000 to 1 700 meters above sea level. The families botanics with the greatest predominance in the coffee plots are Fabaceae, Tiliacae, Euphorbiaceae, Ulmaceae, Lauraceae, Clethraceae and Fagaceae. Likewise, to determine the diversity in detail, three indices were created, namely: the Margalef biodiversity index, the Simpson dominance index, and the Berger-Parker abundance index.   The indices show a medium level of tree diversity, with a Margalef index of 3 on a scale of 5. We recommend taking advantage of the margin to increase the biodiversity in the coffee plantations by planting species for various purposes, including food.

The study was conducted inside the Mixteca region, particularly in the communities of Santa Ana Tamazola, and Santa Maria La Concepcion, both in the municipality of Jolalpan, Pueba. The information obtained was derived from the field instruments referred as semi-structured interviews asides from participant observations and dialogues with key informants. The findings focus on farm families whose economy is based on field-related activities and the extraction of important natural resources from the tropical forest caducifolious, particularly firewood. Some farm families sell the firewood to diversify their activities and restore the family income. It involves dinamic farm families who readjust their life strategies according to the current situation. With the implementation of the Lorena Stove, an estimated $1 122.58 per farm family is saved every year. These savings allow the aquisition of other products that satisfy farm family needs allowing a greater social wellfare and better health for social reproduction.

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