阿尔泰山落叶松林碳储量与生产力时空特征及其气候成因分析

准确把握阿尔泰山落叶松林固碳的动态变化对于维护阿尔泰山地森林生态系统的稳定性具有重要作用。基于4期(2001、2006、2011、2016年)森林资源连续清查资料,采用一元生物量模型、生物量与生产力关系方程、标准系数法和因子分析法等方法,估算了阿尔泰山落叶松林碳密度、碳储量和生产力(NPP),分析其时空变化特征,并探讨了阿尔泰山落叶松林固碳的气候成因。结果表明:(1)2001—2016年间阿尔泰山落叶松林固碳整体呈增长趋势,但增长幅度不大。(2)阿尔泰山落叶松林碳储量呈"富蕴阿勒泰哈巴河、青河布尔津福海"的分布特征;碳密度及NPP表现出"东南高,西北低"的空间分布格局;垂直分布上,碳储量、碳密度及NPP均呈随海拔升高先增后降的变化特征,在北坡和西北坡最大。(3)阿尔泰山落叶松林碳密度及NPP均随气温的升高而增加,是其主导影响因素。

Spatio-temporal analysis of carbon sequestration and NPP in Larix forest in the Altay Mountains

Understanding the dynamic change in carbon sequestration in Larix forests plays an important role in maintaining the stability of the forest ecosystem in the Altay Mountains. Based on the continuous inventory data of forest resources during four periods (2001,2006,2011,2016), we estimated the carbon density, carbon storage, and productivity, and analyzed the temporal and spatial variation characteristics of Larix forest in the Altay Mountains using a one-element biomass model and an equation between biomass and productivity. At the same time, the climate response mechanism was discussed by the methods of standardized coefficient and factor analysis. The results show that (1) the carbon sequestration of the Larix forest showed a growth trend from 2001 to 2016, but the growth rate was not high. (2) The carbon storage in the Larix forest was in the order of Fuyun > Altay > Habahe, Qinghe > Buerjin > Fuhai; the carbon density and net primary productivity (NPP) were higher in the southeastern area than in the northwestern area. Vertical distribution showed that the carbon storage, carbon density, and NPP first increased and then decreased with elevation and were the highest on the north and northwest slopes. (3) The carbon density and productivity of the Larix forest increased with an increase in air temperature, and air temperature was the dominant climatic factor.