1901-2008年小兴安岭森林NPP估算

摘要

根据黑龙江省森林收获表、生物量相容性相对生长方程及叶片与细根周转率数据，估算小兴安岭林区森林主要树种净初级生产力( NPP)与年龄的关系，并结合森林生态系统碳循环模型 InTEC 模型和 NPP 与年龄的关系，估算1901—2008年间小兴安岭森林 NPP的时空变化。结果表明：幼龄林 NPP随林分年龄的增长而迅速增加，进入成熟年龄 NPP达到最大，随后逐渐减少，直至达到稳定值；小兴安岭人工林的 NPP大于天然林，天然针叶林的固碳能力大于天然阔叶林与针阔混交林；1901—2008年间小兴安岭森林NPP整体呈现增加趋势，与工业前期1901年相比，2008年小兴安岭森林NPP增加了30%；森林NPP受海拔影响，呈现出中部偏高、北部与南部偏低的趋势。%In this study,net primary productiviby ( NPP ) data at various stand ages for eight major forest types in Xiaoxing’an Mountains in northeast China were estimated from stand yield tables with consideration of the total biomass increment and foliage and fine-root turnovers. Then,we estimated the spatial and temporal changes in NPP according to NPP-age relationships and InTEC model. The results indicated that the forest NPP increased quickly at young ages,reached the maximum value at middle age (10 -40 years old),and then decreased to a relative stable level at old ages. NPP of planted stands in Xiaoxing’an Mountains was larger than the natural forest. Natural coniferous forest can accumulated more carbon than natural broad-leaved mixed forest and natural coniferous and broad-leaved mixed forest. Forest NPP in Xiaoxing’an Mountains in 1901-2008 presented an increase trend,NPP in 2008 increased by 30 percent more than that in 1901. Forest NPP was higher in middle part and lower in northern and southern part because of the elevation effects on NPP.