Maximum density and density management diagram for mixed-species forests in Durango, Mexico

作者：Quinonez-Barraza Geronimo^*; Tamarit-Urias Juan C.; Martinez-Salvador Martin; Garcia-Cuevas Xavier; de los Santos-Posadas Hector M.; Santiago-Garcia Wenceslao

来源：Revista Chapingo, Serie Ciencias Forestales y del Ambiente, 2018, 24(1): 73-90.

DOI：10.5154/r.rchscfa.2017.09.056

• Self-thinning
• growth space
• Stand Density Index
• stochastic frontier regression
• Reineke

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 densitysize 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.

• 出版日期2018-4