香格里拉市高山松林碳储量空间分异研究

Spatial Differentiation of Carbon Storage for Pinus densata in Shangri-La City

以香格里拉市高山松林为研究对象,构建高山松单木碳储量模型,结合森林资源二类调查数据推算香格里拉市高山松林的碳储量和碳密度,以DEM为数据源,对研究区高山松林碳储量和碳密度的空间分布特征进行分析。研究结果表明,高山松单木碳储量模型以幂函数模型精度最高,决定系数R~2=0.989,均方误差MSE=259.43,可用来进行高山松林碳储量估测;在空间分布上,研究区高山松碳储量集中分布于海拔>2 500~4 000 m地段,在海拔>2 000~2 500 m地段碳储量密度最大,为40.80 t/hm^(2);高山松林碳储量从平坡到险坡的分布呈先增大后减小的趋势,其中,在陡坡上分布最多,在平坡上分布最少;高山松林碳密度随坡度的增大呈先增大后减小的趋势,其中高山松林在急坡上的碳密度最大,为35.94 t/hm^(2),在平坡上的碳密度最小,为30.85 t/hm^(2);高山松林碳储量在平地上分布极少,在阴坡、半阴坡、半阳坡、阳坡上的分布差异不大,呈先增大后减小的趋势,其中,在半阳坡上的分布最多,在阴坡上的分布最少,高山松林碳密度大小在各坡向上相差不大,在半阳坡上最大,为34.40 t/hm^(2),在平地上最小,为32.20 t/hm^(2)。

The Pinus densata forest in Shangri-La was researched to establish a carbon storage estimation model,the carbon storage and carbon density were calculated using forest resource inventory data,and the digital elevvation model(DEM) data was used as the information source to analyze the spatial differentiation characteristics of Pinus densata carbon storage and carbon density.The study results showed that the power function model had the highest accuracy,with a determination coefficient(R~2) of 0.989 and a mean square error(MSE) of 259.43,the model could be used to estimate Pinus densata carbon storage;in spatial distribution,Pinus densata forest carbon storage mainly distributed at altitude of >2 500-4 000 m,carbon density was the largest at an altitude of >2 000-2 500 m,was 40.80 t/hm^(2);from flat slope to risk slope,the distribution of Pinus densata forest carbon storage showed a trend of increase then decrease,most distribution on steep slope,least distribution on flat slope;with the slope increase,Pinus densata forest carbon density showed a trend of increase then decrease,Pinus densata forest carbon density on the steep slope was the largest,was 35.94 t/hm^(2),while carbon density on the flat slope was the smallest,was 30.85 t/hm^(2);few carbon storage distributed on flat land,with little difference in distribution on shaded slopes,half shaded slopes,half sunny slopes and sunny slopes,showing a trend of increase then decrease.The distribution was most on half sunny slopes and least on shady slopes.The carbon density of Pinus densata forests was not significantly different on each slope,with the largest being 34.40 t/hm^(2) on half sunny slopes and the smallest being 32.20 t/hm^(2) on flat land.