基于RS和GIS分析干旱区土地利用/覆盖变化对陆地植被碳储量的影响——以新疆鄯善县绿洲为例  

Analysis based on RS & GIS of the effect of land-use/cover change on vegetation carbon reserves in arid region——A case study on oases of Shanshan,Xinjiang

作　　者：周绪[1] 刘志辉[1] 菊春燕[1] 戴维[1] 易莉[1] 姜红[1] 

机构地区：[1]中山大学环境与工程学院,广东广州510275

出　　处：《干旱地区农业研究》2007年第6期231-236,共6页Agricultural Research in the Arid Areas

基　　金：中日政府合作项目"新疆吐鲁番盆地地下水可持续利用研究"(70361001)

摘　　要：土地利用馒被变化是影响陆地碳循环的一个重要因子。依据鄯善平原绿洲群1990、1999两年9月TM与SPOT4（P）的融合影像以及2004年9月SPOT5（XS／XI）影像数据，采用混合分类法对研究区土地覆被进行分类，估算其变化面积以及林地与各土地覆被类型的面积转换。结果显示：1990～1999年、1999～2004年研究区林地面积年变化率分别为＋4．59％、-1．70％，植被碳库1999年比1990年增加了264．13×10^3t，2004年较之1999年减少了70．75×10^3t，但2004年植被碳储量较1990年上升212．04×10^3t，研究区总体上为一小的净碳汇。15a间天然草地的植被碳储量一直下降，并在后期呈现更为严峻的态势。说明在极端干旱区，生态系统的稳定仍面临极大挑战。如何实现丰富矿产资源的开采与人居生存环境相协调，做好土地、水资源管理与生态环境保护工作，仍需更为深入、审慎的研究。Land use/cover changes have been an important effect on carbon cycle. In this paper, we used multitemporal Landsat TM/SPOT4 （P） merge data and SPOT5 （XS/XI） data to compute the extent of different land cover types and mutual transformation one another in oases plain. The land - cover maps were made by the hybrid classification （method of combining unsupervised classification and supervised classification）, and then the changes were detected. Carbon storages were assessed by using the results of multi-temporal Landsat TM/ SPOT4（P） merge data and SPOT5（XS/XI） data and the published data about carbon storage in vegetation. Results indicate that the change rates of woodland area increased ＋ 4.5 % per year from 1990-1999. Whereas, it decreased - 1.7 % per year from 1999-2004. Carbon storages in vegetation added to 264.13 ×10^3 t from 1990 - 1999 and it reduced to 70.75 × 10^3 t from 1999 - 2004 . However, carbon storage in vegetation was steady increased by 212.04 ×10^3 t for 15 years. Thus, there has been a little carbon sink in the study area. But carbon storage in natural grassland was dramatically diminished, thus the state of local environment has been extremely frail. So, reasonable and scientific supervisionof the land use and environmental protection should be attached special importance.

关 键 词：RS&GIS 干旱区 土地利用馒被变化 陆地植被碳储量 

分 类 号：S127[农业科学—农业基础科学]