西宁市城区森林生态系统碳汇服务价值评估

ESTIMATION AND EVALUATION OF FOREST CARBON SINKS VALUE IN CITY——A CASE STUDY OF XINING

以西宁市城区为研究对象,利用生物量转换因子连续函数法,对西宁市城区森林生态系统碳汇服务价值进行了初步评估。结果表明:1)西宁市城区森林生态系统植被总碳库储量约为12.33×104t,其中乔木林活体碳库为8.15×104t,占整个碳库储量64.35%;林下层植被碳库储量为4.18×104t,占整个碳库储量35.75%。林下层植被碳库中,枯落物、灌木、草本层碳库储量分别约为2.6×104t、7665.2t、7805.4t,分别占林下层植被碳库储量的55.45%、21.55%、23%;2)从优势树种碳库储量分析,青杨碳储量最大,其次为青海云杉、油松、柏树类、榆树、旱柳,分别占整个森林生态系统植被碳库储量的45.23%和26.85%、11.92%、7.26%、6.74%、2%;3)西宁市城区森林生态系统碳汇服务价值总值约为964.25×104元人民币;乔木林和林下层分别占65.25%、34.75%;4)从优势树种对总价值的贡献率分析,青杨和青海云杉贡献率最高,其次是油松、柏树类、榆树、旱柳。碳汇价值分别为525.4×104元、341.7×104元、46.8×104元、27.3×104元、20.1×104元、3×104元;分别占总价值的57.37%、31.43%、6.15%、2.75%、2.05%、0.25%。

This study takes Xining city as the reach abject. The carbon stocks of forest ecosystem was estimated using data of Xining forest resources by the biomass conversion factor continuous function method. Based on this, according to our country forest carbon sinks, the optimal price range value, service value to carbon sink of forest ecosystem has carried on the preliminary assessment 10.2-15.3 dollar/t, the results show that： 1 ） the reserves of forest ecosystem in Xining city is about 12.34 ten thousand tons among them. The reserves of the ar- bor forest in vivo is 64.35%, which is about 8.2 ten thousand tons, the reserves of the forest and the lower veg- etation carbon pool is 35.75%, which is about four million 41.8 thousand tons. Among the carbon pool of forest and lower vegetation, litter, shrub and herb layer carbon storage is 26 thousand tons,7665.2 tons,7805.4tons, accounting for 55.45%,21.55%,23% ;2） Analysis of carbon storage of main dominant tree species, poplars, followed by picea crassifolia , Chinese pine, cypress, elm, salilz matsudana, accounting for 45.23%,26.85%, 11.92% ,7.26% ,6.74% ,2% of all. Significantly lower than the world average 86T/hm2 ; 3 ） The value of forest ecosystem carbon sinks in Xining is about 964.3 ten thousand RMB ;4）Analysis on the contribution rate of dom- inant tree species to the value, poplars and picea crassifolia, followed by Chinese pine, cypress, elm, soliz matsudana, their values are 525.4, 341.7,46.8,27.3,20.3,3 ten thousand RMB , accounting for 57.37%, 31.43% ,6.15% ,2.75% ,2.05% ,0.25%.