福建省毛竹林碳贮量的空间自相关分析

Spatial autocorrelation analysis on carbon storage of Phyllostachys edulis forest in Fujian Province

以1985年、1996年和2006年福建省毛竹〔Phyllostachys edulis(Carr.)J.Houz.〕林资源二类清查资料为基础数据估算福建省毛竹林碳贮量,在此基础上,采用空间自相关分析法对福建省毛竹林碳贮量的空间分布规律和空间自相关关系进行研究。结果表明:1985年、1996年和2006年福建省毛竹林碳贮量的空间分布特征相似,均呈现闽西和闽北区域较高、闽东和闽南区域较低的规律;并随时间的推移毛竹林碳贮量逐渐增加。1985年、1996年和2006年福建省毛竹林碳贮量的全局空间自相关指数Moran’s I分别为0.36、0.38和0.41,Z值分别为4.98、5.32和5.57,说明福建省毛竹林碳贮量呈现显著的正空间自相关性,具有明显的集聚现象,且随时间推移集聚现象越来越明显。局部空间自相关分析结果表明:闽西和闽北区域毛竹林碳贮量的空间分布呈现显著的"高-高"正相关集聚特点,而闽东和闽南区域则呈现显著的"低-低"正相关集聚特点,其他少数区域则呈现"高-低"或"低-高"负相关集聚特点。研究结果显示:福建省毛竹林碳贮量的分布格局与各地区毛竹林的发展状况有关。

Taking secondary inventory data of Phyllostachys edulis（ Carr.） J. Houz. forest resources of Fujian Province in 1985,1996 and 2006 as basic data,carbon storage of P. edulis forest in Fujian Province was estimated. On this basis,its spatial distribution regularity and spatial autocorrelation relation were researched by spatial autocorrelation analysis method. The results show that spatial distribution characteristics of carbon storage of P. edulis forest of Fujian Province in 1985,1996 and2006 are similar with a regularity of higher in west and north areas of Fujian Province and lower in east and south areas of Fujian Province,and carbon storage of P. edulis forest increases gradually as time goes on. Global spatial autocorrelation index Moran＇s I of carbon storage of P. edulis forest of Fujian Province in 1985,1996 and 2006 is 0.36,0.38 and 0.41,respectively,and their Z value is 4.98,5. 32 and5. 57, respectively, meaning that carbon storage of P. edulis forest in Fujian Province appears significantly positive spatial autocorrelation,there is obvious agglomeration phenomenon and it is more and more obvious as time goes on. The results of local spatial autocorrelation analysis show that spatial distribution of carbon storage of P. edulis forest in west and north areas of Fujian Province appears significantly ＂high-high＂positive correlative agglomeration feature,while that in east and south areas of Fujian Province appears significantly ＂low-low＂positive correlative agglomeration feature,that in other minority regions appears ＂high-low ＂ or ＂low-high ＂ negative correlative agglomeration features. It is suggested that distribution pattern of carbon storage of P. edulis forest in Fujian Province is related to development status of P. edulis forest in each area.