摘要
以桂西北喀斯特区域——广西环江县为研究区,基于景观结构信息对研究区的生态环境脆弱度进行评价。将灰关联分析法应用于指标体系的构建,选取破碎度、分维数、聚集度、土壤侵蚀指数、植被覆盖指数和喀斯特地貌面积比作为评价指标,计算了研究区的景观类型脆弱度和区域生态环境脆弱度,并对结果进行半变异函数分析和空间插值分析,揭示了研究区生态环境脆弱度的空间分布特征。研究结果表明:(1)研究区林地景观脆弱度最高,其次为未利用地和耕地;(2)半变异函数分析表明,区域生态环境脆弱度指数具有明显的空间相关性,相关距离在25km左右,区域脆弱度的空间变异在15km以内表现出明显的各向同性,15km以外表现出各向异性;(3)区域生态环境脆弱度整体上表现出从东北到西南逐渐增大的趋势,局部随着高程的增加表现出"高-中-低-中-高"的变化特征,地质和地形是该区生态环境脆弱度空间格局的两大控制因素。
The eco-environment vulnerability assessment was conducted in Huanjiang, a karst region of northwest Guangxi, based on the landscape structure. Grey relational grade analysis was adopted to study the assessment index system, and we finally selected fragmentation, perimeter-area fraetal dimension, aggregation index, area proportion of karst landforms, soil erosion index and vegetation coverage index as the evaluation factors to construct the eco-environment vulnerability model to evaluate the vulnerability of landscape types and the regional eco-environment vulnerability degree, semi-variogram analysis and ordinary Kriging interpolation were conducted to get the distribution map of regional eco-environment vulnerability. The results showed that ： （ 1 ） The vulnerability of the landscapes of forest lands was the highest, followed by unused land and farmland; （2）The semi-variogram analysis showed that the regional eco-environment vulnerability had a relatively good spatial autocorrelation in the study area, and the range of autocorrelation extended to about 25km. The spatial variability of the regional eco-environment vulnerability was in an obvious isotropy within 15km, but existed distinct anisotropy character outside 15km; （3）From the global aspect, the regional vulnerability index was higher in southwest area than that in northeast area, and it was highly related to the elevation. This showed that geology and topography of the study area were the dominant factors affecting the spatial pattern of the regional eco-environment vulnerability.
出处
《生态学报》
CAS
CSCD
北大核心
2009年第2期749-757,共9页
Acta Ecologica Sinica
基金
中国科学院西部行动计划(KZCX2-XB2-08)
国家重点基础研究发展计划(973计划)课题资助项目(2006CB403208)
中国科学院知识创新工程青年人才领域前沿资助项目(ISACX-LYQY-QN-0704)
关键词
喀斯特
景观结构
生态环境脆弱性
空间变异
广西
karst
landscape spatial structure
eco-environment vulnerability
spatial variation
Guangxi
