祁连山地区不同植被生态系统固碳价值量估算及时空演变分析

Estimation of the carbon sequestration value and spatial and temporal evolution of different vegetation ecosystems in Qilian Mountains

基于改进的CASA模型测算祁连山地区植被净初级生产力(NPP)物质量,并进一步基于光合作用方程式、碳循环过程模型估算了研究区2005年、2010年、2015年植被、土壤固碳量及价值,旨在定量分析该区域不同植被生态系统植被、土壤固碳价值时空演变情况,为制定更科学合理的碳管理措施提供科学依据。研究表明:祁连山地区2005-2015年植被、土壤固碳价值呈递增趋势,2005年、2010年、2015年植被、土壤固碳价值分别为515.95、356.56亿元;491.05、404.36亿元;581.55、465.65亿元,土地类型的改变使得植被、土壤固碳分别增长12.72%、30.39%。从空间分布上看,东部植被、土壤固碳量明显高于西部,林地固碳能力最高,单位面积固碳量为10.19t·hm^-2。草地是研究区分布最广的植被,且其对该地区植被、土壤固碳贡献比为51.13%、49.34%。

Based on the improved CASA model,in this paper,the net primary productivity(NPP)quality of vegetation in the Qilian Mountains is estimated,and the vegetation and soil carbon sequestration and value are further estimated in the study area in2005,2010 and2015 based on photosynthesis equation and carbon cycle process model.The quantitative analysis of the spatial and temporal evolution of vegetation and soil carbon sequestration values of various vegetation ecosystems in this region provide a scientific basis for the development of more scientific and rational carbon management measures.The research shows that the value of vegetation and soil carbon sequestration in the Qilian Mountains had increased from2005 to2015.The value of vegetation was515.95×108 yuan,491.05×108 yuan and581.55×108 yuan in2005,2010 and2015;the value of soil carbon sequestration was356.56×108 yuan,404.36×108 yuan and465.65×108 yuan in2005,2010 and2015.The change of land type has increased the soil and soil carbon sequestration by12.72%and30.39%,respectively.From the perspective of spatial distribution,the carbon sequestration in the eastern vegetation and soil is significantly higher than that in the west.The carbon sequestration capacity of the forest is the highest,and the carbon sequestration per unit area is10.19 t·hm^-2.Grassland is the most widely distributed vegetation in the study area,of which the contribution ratio to vegetation and soil carbon sequestration in this area is51.13%and49.34%respectively.