森林蓄积量调查数据空间化的方法研究  

Methodology for spatialization of timber volume data from forest inventory

作　　者：廖顺宝[1,2] 许立民[1] 

机构地区：[1]河南大学环境与规划学院,河南开封475004 [2]中国科学院地理科学与资源研究所,北京100101

出　　处：《中南林业科技大学学报》2013年第11期1-7,18,共8页Journal of Central South University of Forestry & Technology

基　　金：中国科学院战略性先导科技专项(XDA05050000);环保公益性行业科研专项(201209030)

摘　　要：森林是陆地生态系统的重要组成部分,蓄积量是森林资源调查的基本指标之一。传统的森林蓄积量调查数据一般以行政单元为记录进行表示,因此,难以在更细尺度上反映蓄积量的空间分布及其变化。以20世纪80年代全国森林资源清查数据为例,在国家和省区两个尺度分别分析森林蓄积量与不同土地利用类型面积和不同土地覆被类型面积之间的关系。结果显示:不论在国家尺度还是省区尺度,森林蓄积量与土地覆被类型的相关性(国家尺度R2=0.568 2;省区尺度R2=0.851 1)均优于其与土地利用类型的相关性(国家尺度R2=0.528 3;省区尺度R2=0.775 4),而且分省区模型优于全国整体模型;在此基础上,基于蓄积量与不同森林类型面积之间的线性回归模型,利用回归计算结果与残差修正相结合的方法,计算得到全国1 km×1 km分辨率的森林蓄积量空间化产品,该产品既反映了公里网格尺度上蓄积量的空间变化,又可以利用该产品统计全国及省区、市县的森林蓄积总量;根据本研究的空间化结果进一步计算得到,20世纪80年代全国森林蓄积总量为1.348 6×1010 m3。Forest is a very important part of land ecosystem. Timber volume is one of basic indicators for forest inventory. The timber volume data usually are expressed in attribute tables with administrative divisions as record units, so it is difficult to reflect spatial dynamic of the timber volume in a detail scale. In this study, 1980s＇ forest inventory data of China were used to analyze the relationship between timber volume and area of various kinds of forest （by landcover） or timberland （by landuse） in national and provincial levels respectively. The results from regression analysis demonstrated that the timber volume had closer relationships with landcover （e2 = 0.568 2 at national scale and 0.851 1 at provincial scale） than with landuse （R2 = 0.528 3 at national scale and 0.775 7 at provincial scale） either at national scale or provincial scale, and provincial models were better that national models. Based on the analysis results, the linear regression models between timber volume and area of different forest categories at provincial level were used to calculate the national timber volume product of China at a resolution of lkm by 1 km. And the result from the models computation was rectified with residuals which came from regression analysis at a scale of 1 km by 1 km. The rectified product, which is final product, can not only reflect spatial dynamic of the timber volume at a scale of 1 km by 1 km, but also be used to count total timber volume in light of administrative divisions at national, provincial or county levels. Based on the product there were about 13.486 billion cubic meters of timber volume in China in 1980s.

关 键 词：森林 蓄积量 调查数据 数据空间化 

分 类 号：S758.51[农业科学—森林经理学] S771.8[农业科学—林学]