摘要
植被是综合体现矿区生态环境状况的关键因子。以NDVI值为参数,基于像元二分的遥感估算方法测度了1999—2010年大同矿区的植被覆盖情况。利用Global Moran's I、Getis-Ord General G、Getis-Ord Gi*、Anselin Local Moran I等空间关联指数分别从全局演变和局部效应的视角揭示了矿区植被受煤炭开发等活动扰动的时空演化和内在作用机制。研究结果表明:(1)大同矿区植被盖度变化在空间上呈集聚分布状态,表现出很强的空间自相关性,这一现象在植被盖度最低时期最明显;(2)在植被盖度上升期,其变化的热点区不断减少或向次热点地区分散,矿区植被变化集聚效应越发不显著,总体上呈离散的态势。(3)煤炭开发对矿区植被的扰动呈现整体性特征,与煤炭产量成正比。(4)不同植被类型受煤炭开发扰动呈现不同的变化特征。(5)采用循环工艺的高效高产矿井大规模煤炭开发对植被的扰动作用尚不明显,但长期效应有待进一步研究。
Vegetation is a key factor which comprehensively reflects condition of ecology and environment in mining area. With NDVI index as the parameter, vegetation coverage in Datong coal mining area from 1999 to 2010 were measured based on dimidiate pixel model by remote sensing estimation method. Spatial correlation indexes such as Global Moran＇s I, Getis-Ord General G, Getis-Ord Gi＊ and Anselin Local Moran I were respectively used to reveal the temporal evolution and intrinsic mechanism of vegetation disturbed by coal mining from the global evolution and local effect perspective. Research results showed that： （1） Changing of vegetation coverage in Datong coal mining area presented cluster distribution and strong spatial autocorrelation in space, meanwhile, the phenomenon was absolutely obvious when vegetation coverage was in the lowest period. （2）In the rising period of vegetation coverage, hotspots of vegetation coverage gradually reduced or separated to the secondary hotspots area, clustering effect of vegetation changing became less significantly, which presented discrete state in general. （3） The disturbance of coal mining brought to vegetation showed overall characteristics and in proportion with coal production. （4）Different vegetation types presented different changing characters caused by coal mining.（5）The disturbance effect which large-scale coal mining of high efficiency and large production coal mines adopted circulation techniques brought to vegetation was still inconspicuous, however, the long-term effects need to be further studied.
出处
《生态学报》
CAS
CSCD
北大核心
2013年第21期7035-7043,共9页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(51174287)
国家自然科学基金青年资助项目(41101428
71103182)
江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0942)
江苏高校优势学科建设工程资助项目(SZBF2011-6-B35)
山西省科技重大专项资助项目(20121101008)
关键词
煤矿区
植被盖度
时空效应
图谱分析
coal mine area vegetation coverage spatio-temporal effect graphic analysis
