资源环境科技发展态势分析平台

Mexican oak forests (genus Quercus) are frequently used for traditional charcoal production. Appropriate management programs are needed to ensure their long-term use, while conserving the biodiversity and ecosystem services, and associated benefits. A key variable needed to design these programs is the spatial distribution of standing woody biomass. A state-of-the-art methodology using small format aerial photographs was developed to estimate the total aboveground biomass (AGB) and aboveground woody biomass suitable for charcoal making (WSC) in intensively managed oak forests. We used tree crown area (CA(ap)) measurements from very high-resolution (30 cm) orthorectified small format digital aerial photographs as the predictive variable. The CA(ap) accuracy was validated using field measurements of the crown area (CA(f)). Allometric relationships between: (a) CA(ap) versus AGB, and (b) CA(ap) versus WSC had a high significance level (R-2 > 0.91, p<0.0001). This approach shows that it is possible to obtain sound biomass estimates as a function of the crown area derived from digital small format aerial photographs.