摘要
在广泛收集资料的基础上,利用平均碳密度方法,估算了西藏草地生态系统中17类草地植被的碳贮量,并分析了其影响因子。结果表明:(1)17类草地植被总面积为8 205.194×10~4hm^2,草地植被总碳贮量为189.367 TgC,草地植被平均碳密度为2.308 t/hm^2,不同草地植被类型差异较大,在0.396～20.471 t/hm^2之间波动;(2)从区域分布来看,阿里、那曲、日喀则3地区,既是西藏草地主要的分布区,分布面积占西藏草地总面积的84.156%,又是西藏草地生态系统碳贮量的主要贮藏库,其中植被碳贮量占整个17类草地植被碳贮量的60.278%;(3)采用逐步回归模型和主成分分析方法,分析了气候因子对西藏草地植被碳贮量的影响程度,指出降水对草地植被碳贮量的贡献大于气温。
On the basis of far-flung collecting of databases in Tibet grassland and making use of average carbon density method to assess 17 vegetation carbon reserve of grassland ecosystem and analyzed its relationship with climatic factors. The results showed that. （1） The total area of 17 grassland vegetations was 8 205. 194× 10^4 hm^2 , the grassland vegetations total carbon store was 189. 367 TgC, the average carbon density of grassland Vegetations was 2 307. 892, between 395. 977 kg/hm^2 and 20 471. 161 kg/hm^2 changing, and existed diversity in different grassland vegetations. （2） From the regional distributing, Ali, Naqu and Rikaze not only the mainly grassland regions that proportion was 84. 156 M of Tibet grassland but also was the mostly carbon pool of Tibet grassland ecosystem carbon store, which vegetations carbon store proportion was 60. 278% of all 17 vegetations carbon store. （3） Used stepwise regression and principal components method to analyze the factors of climate to compact on the Tibet vegetation carbon reserve, and showed that the precipitation function bigger than temperature factors.
出处
《水土保持学报》
CSCD
北大核心
2008年第3期120-125,共6页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(40661007)
关键词
西藏草地
植被
碳贮量
影响因子
Tibet grassland
vegetation
carbon reserve
function factor
