青海省近20年森林植被碳储量变化及其现状分析

CHANGE OF CARBON STORAGE IN FOREST VEGETATION AND CURRENT SITUATION ANALYSIS OF QINGHAI PRONVINCE IN RECCENT 20 YEARS

基于林业生态功能和青海省森林资源清查数据,采用森林植被生物量换算因子连续函数法,系统估算与分析青海省森林植被碳储量、碳密度,研究其近20a碳储量变化并进行现状分析。结果表明:(1)青海省森林碳储量为11 182 642.22t,占同时期全国总碳储量的1.98%,青海省森林生态系统中面积占较大比重的中龄林,其碳储量尚未达到最大,有较大发展空间;(2)青海省近20a天然林类型中碳储量较大的前4种分别是:柏木(Cupressus funebris)、桦木(Betula)、杨树(Populus)、云杉(Picea asperata)天然林,表明这几种天然林在青海省森林植被中占有重要的地位,其集中分布对区域生态功能的发挥起主导作用;(3)所采用的碳储量估算方法尚存不足,在以后计算中应考虑根据不同林分类型的含碳量进行计算。

The forest is one of the important carbon pool in terrestrial ecosystems, it plays an irreplaceable role in reducing the accumulation of greenhouse gases and slowing global warming. So accurately estimating and analysing vasious carbon storage of terrestrial ecosystem , carbon density, realistic assessment of the different types of vegetation and soil carbon storage capacity played the important role played in treasonable evaluation of terrestrial ecosystems in the global carbon cycle. Forest carbon sequestration is the key parameters to researching the relationship between forests and atmospheric carbon exchange and estimateing the forest absorption or the emission of carbon-containing gas. We can study them through traditional harvest method, the method of sample investigation, the method of tree rings, the method of estimation by Remote Sensing, the method of flux measurement and model simulation. The biomass of forest communities is the best indicator of the productivity of the forest. The biomass of forest communities which is also the most direct expression of the level of ecosystems. Forest ecosystem structure and function is also a comprehensive reflection of the quality of the environmental quality of the forest ecosystem. Forest carbon storage is the basic parameters of studying the exchange of carbon between the forest and the atmosphere. Based on ecological function and forest resources inventory data in Qinghai province and the Biomass Expansion Factor （BEF） method we estimated carbon storage and carbon density of forest vegetation in Qinghai Province,China. We found the results showed that the carbon storage of arbor forest in Qinghai Province is 11 182 642.22 t,the date accounting for 1.98% of the same period of the country＇s total carbon storage. Accounting to our analysis, the middle-aged forest type is a larger proportion of carbon storage which have not yet reached the maximum,and if people utilize a better management it will have its development space in forest ecosystem of Qinghai Province. The first four natural forest types in carbon storage of Qinghai Province in the past 20 years are： Chamaecyparis funebris Betula spp Populus Picea asperata,which shows that these types of natural forests in Qinghai forest vegetation occupies an important position. The estimation method of The carbon storage in this paper still have problems that we should consider different forest types and use different methods of calculation.