##article.highlights##
- Density was analyzed for mixed-species stands at UMAFOR 1005 “Santiago Papasquiaro y Anexos” in Durango, Mexico.
- Reineke’s model adjust to the density of mixed-species stands
- The stochastic frontier regression with normal-truncated approach models best the maximum density line.
- The density management diagram helps to prescribe thinning in mixed-species stands.
- Thinning can be applied with cutting intensities greater than 30 %.
Abstract
Introduction: Stand density affects productivity and the structure and functions of forests.
Objectives: To compare maximum density lines for mixed-species forests adjusted with Ordinary least Squares (OLS) and Stochastic Frontier Regression (SFR); and generate a density management diagram (DMD) to prescribe thinning.
Materials and methods: The data was obtained in mixed-species stands from the Forest Management Unit 1005 “Santiago Papasquiaro y Anexos” in Durango, Mexico. The density-size relationship was established using the Reineke’s model. The maximum density line was adjusted with OLS and SFR, the latter with the half-normal (H-N), normal-exponential (N-E) and normal-truncated (N-T) approaches. The DMD was constructed with the SFR equation with the normal-truncated distribution approach.
Results and discussion: The maximum density line, modeled through SFR with N-T approach showed better fit to the upper limit of the maximum density of the mixed-species stand data. DMD suggests that thinning for these stands can be applied with high cutting intensities, contrary to conventional practices, where rarely more than 30 % of the basal area or volume is cut.
Conclusion: The maximum density line for mixed-species forests in Durango, Mexico, was generated with stochastic frontier regression, as a normal-truncated model.
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