森林立地指数的地统计学空间分析  

Spatial pattern analysis of forest ecosystem site index using geostatistical technology

作　　者：曾春阳 唐代生[2,3] 唐嘉锴 

机构地区：[1]广西壮族自治区林业勘测设计院,南宁530011 [2]中南林业科技大学,长沙410004 [3]武汉大学空间信息与数字工程研究中心,武汉430079 [4]衡阳市林业局,衡阳421001

出　　处：《生态学报》2010年第13期3465-3471,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30871962);国家林业局科技司资助项目(069320);湖南省科技厅科技计划重点资助项目(2007[F]4200)

摘　　要：森林生态系统立地质量的评估是森林生态系统经营管理和造林营林的重要理论基础与规划方法,也是研究森林生态系统生产力的重要内容。森林立地指数是一种已被普遍接受的评价森林立地质量的方法,然而由于技术所限,传统的森林立地指数调查方法因其耗时长、花费大,很难大面积的对森林立地指数进行估测和空间分析,地统计学结合地理信息系统技术为研究森林立地及空间格局提供了一条新的途径。以杉木人工林为研究对象,地统计学及地理信息系统技术为手段,根据江西省景德镇枫树山林场杉木立地指数空间分布特点,选取合适的变异函数理论模型,对其森林立地指数进行了估测和空间分析,并在精度验证的基础上对结果进行了评价。研究结果表明,江西省枫树山林场杉木人工林立地指数有中等程度的空间相关。通过模型模拟结果和实测结果对比,K-贝塞耳函数(K-Bessel)模型有较好的拟合效果和较高的精度,说明地统计学在森林立地指数的估测和空间分析中有一定的应用价值。The evaluation of site index and site quality provides not only a fundamental theory but also basic tools for forest ecosystem management and silviculture practice.Site index is a well-received method of evaluating site quality,However,the traditional site index inventory method is very time consuming and cost,It is difficult to apply this method for spatial analysis in large area due to the limitation of technology.Geostatistics which combine with geographic information system provides a new approach for studying forest site index and its spatial pattern.In this study,the site index spatial distribution pattern of Chinese fir plantation forest was describled using geostatistics and geographic information system after choosing appropriate variogram model in Fengshushan Forest Farm in Jiangxi Province,We then evaluated the results through the accuracy assessment.The results show that site index of Chinese fir plantation forest has middle degree spatial correlation.After comparing the estimated results with actual results,the K-Bessel models are confirmed with high accuracy.This study indicates that this new evaluation approach can be used for site index spatial pattern analysis in different forest ecosystems.

关 键 词：立地指数 杉木人工林 地统计学 变异函数模型 

分 类 号：S724[农业科学—林木遗传育种]