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内蒙古大兴安岭根河森林保护区植被覆盖度变化

闫敏1,李增元1*,陈尔学1,田昕1,谷成燕1,李春梅1,2,范文武1,3   

  1. (1中国林业科学研究院资源信息研究所, 北京 100091; 2 西南林业大学林学院, 昆明 650224; 3福州大学省空间信息工程研究中心, 福州 350002)
  • 出版日期:2016-02-10 发布日期:2016-02-10

Vegetation fractional coverage change in Daxinganling Genhe forest reserve of Inner Mongolia.

YAN Min1, LI Zeng-yuan1*, CHEN Er-xue1, TIAN Xin1, GU Cheng-yan1, LI Chun-mei1,2, FAN Wen-wu1,3   

  1. (1Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China; 2College of Forestry, Southwest Forestry University, Kunming 650224, China; 3Key Laboratory of Spatial Data Mining & Information Sharing of Ministry of Education, Fuzhou University, Fuzhou 350002, China)
  • Online:2016-02-10 Published:2016-02-10

摘要: 基于2000年Landsat-5 TM和2013年GF1两期遥感影像,利用像元二分模型分别进行了内蒙古大兴安岭根河森林保护区植被覆盖度的估算,并对该区13年间植被覆盖度的变化情况及其与地形因子的相关性进行了分析。结果表明:利用像元二分法可准确地估算研究区植被覆盖度(决定系数R2=0.52,相对平方误差RSE=0.54)。两期植被覆盖度与高程正相关性最大,其次为坡度。两期植被覆盖度变化图表明,该地区13年间植被覆盖度总体呈下降趋势,其中高覆盖度的下降最为明显。两期植被覆盖度及其差值随高程的增加而增大,海拔超过1027 m两者均变化缓慢,且植被覆盖度变化主要为正变化。火灾、水系富集、人工抚育频繁等因素对低海拔地区植被覆盖度的下降影响较大。

关键词: 森林植被, 大兴安岭东部地区, 碳储量, 分配, 可加性生物量模型

Abstract: The estimations of thirteenyear interval vegetation fractional coverage (VFC) of Genhe forest reserve area were conducted using Landsat-5 TM data acquired in 2000 and GF-1 images in 2013 based on the dimidiate pixel model. The changes of VFC and the relationships between VFC and topographical factors were analyzed. Validated against the field measurement conducted in August 2013, the estimation of VFC using GF-1 image was reliable (R2=0.52, RSE=0.54). The factor that was most positively correlated to the VFC was the altitude, followed by the slope. The VFC declined generally from 2000 to 2013 and the high level of VFC experienced the most obvious change. In particular, both VFCs in 2000 and 2013, as well as their differences which were mostly positive, increased with the altitude until 1027 m, above which the VFC changed slightly. Forest fires, rich drainage and forest tending had great impacts on the decrease of VFC in the lowaltitude mountainous region.

Key words: the east of Daxing’an Mountains, allocation, forest vegetation, additive biomass model, carbon storage