东北针阔混交林生物量动态过程及稳定性研究  

Dynamics and Stability of Biomass of Coniferous and Broadleaved Mixed Forests in Northeast China

作　　者：贾勃 王新杰[1] JIA Bo;WANG Xin-jie(College of Forestry,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学林学院,北京100083

出　　处：《林业科学研究》2023年第5期41-49,共9页Forest Research

基　　金：国家重点研发项目;东北天然次生林抚育更新技术研究与示范(2017YFC050410101)。

摘　　要：[目的]探讨东北地区混交林地上生物量动态过程驱动因子,以准确理解森林服务和功能。[方法]基于东北金沟岭林场的110块固定样地,描述了1987—2017年的森林动态变化过程。利用分段结构方程模型来评估森林结构、气候、地形和多样性对地上生物量的森林动态过程(生长、进界和死亡)的影响,并进一步探究生物量动态过程对稳定性的作用。[结果]表明,生物量生长量受到林分断面积(β=0.562)、海拔(β=0.853)和年均温(β=0.820)的正向影响,与胸径基尼系数呈负相关(β=-0.274)。生物量进界增长量随海拔(β=0.913)、年均温(β=0.944)的增加而增加,与胸径变异系数呈显著负相关(β=-0.233)。生物量死亡损失量只与林分断面积(β=0.467)呈显著正相关。另外,本研究还发现,死亡是影响森林生物量稳定性的最重要因素。[结论]总体来看,海拔和年均温是林分生物量变化的重要驱动因素,以后要更加关注死亡树木的情况,从而更好地进行森林经营。[Objective]To explore the driving factors of the dynamic processes of aboveground biomass of mixed forests in Northeast China for accurately understanding the forest services and functions.[Methods]Based on 110 fixed plots in Jingouling Forest Farm in Northeast China,forest dynamics processes from 1987 to 2017 were described.Piecewise structural equation models were used to assess the impact of forest structure,climate,topography and diversity on the dynamic processes(growth,recruitment and mortality)of biomass,and the effects of dynamic processes on stability were further explored.[Result]The results showed that the growth of biomass was positively affected by stand basal area(β=0.562),altitude(β=0.853),and mean annual temperature(β=0.820),and negatively correlated with the Gini coefficient of diameter at breast height(β=−0.274).The increment of tree recruitment was positively associated with altitude(β=0.913),mean annual temperature(β=0.944),and negatively related to the coefficient of variation of diameter at breast height(β=−0.233).The biomass loss was only significantly positively correlated with the stand basal area(β=0.467).In addition,this study also found that mortality was the most important factor affecting the biomass stability.[Conclusion]In general,altitude and MAT plays an important role in the biomass change.We should pay more attention to the situation of dead trees in the future for forest management.

关 键 词：森林动态 多样性 稳定性 分段结构方程模型 

分 类 号：S718.5[农业科学—林学]