摘要
以黄河三角洲的垦利县为例,以1987年和2000年遥感影像为基本信息源,利用景观类型空间结构信息破碎度、分维数、分离度和景观类型的敏感度、适宜度构建景观类型脆弱度指数CEVI和区域生态脆弱度指数EVI。利用连续覆盖全区的格网进行空间系统采样,使脆弱指数空间化,生成了两个时期的区域生态脆弱度分布图,并对脆弱度的空间格局与动态特征进行分析。结果表明,研究区未利用地和盐荒地景观脆弱度较高,比较1987年和2000年景观类型的脆弱度,旱田、水田、建设用地和未利用地的CEVI指数减少,林草地、盐荒地和水域景观类型的CEVI呈增长趋势;区域生态脆弱度的空间格局及动态变化与黄河河道和海岸线具有较好的相关性,黄河和海岸线是该区生态脆弱度空间格局的控制因素。
The study area, Kenli County of Shandong Province, China, is located in the Yellow River Delta, the annual temperature and precipitation are 12.3℃ and 557.3 mm respectively, and the ratio of annual evaporation and precipitation is as high as 3.74. The Yellow River is the main freshwater source in the region, however, its stream flow is frequently cut off, its inflow is reduced, the groundwater depth is shallow and its mineralization is high, soil salinization or alkalization is serious, the area of saline or alkaline soil occupies two thirds of the total land area, the land use types are mainly the waters, unused lands, salty wastelands, woodlands grasslands and glebes, the productivity and quality of these lands are low, and the ecological environment is extremely vulnerable. In this paper, a case study on the regional ecological environment vulnerability in Kenli County is carried out, the remote sensing images in 1987 and 2000 are used as the basic information sources to derive the information of spatial structure of landscapes, and the vulnerability indexes of landscapes and the suitability indexes of regional ecological environment are developed by using the fragmentations, fractal dimensions and isolations of the information of spatial structure of landscapes and the sensitivity and suitability of landscape types in the study area. The network covering the whole study area is used to sample the spatial vulnerability of ecological environment, thus, the maps of vulnerability distribution of the ecological environment in two periods are derived, and the spatial patterns and dynamic features of the vulnerability are analyzed. The results show that, in the study area, the vulnerability of the landscapes of unused lands and salty wastelands was high, the vulnerability indexes of the landscapes of glebes, paddy fields, lands for construction and unused lands were reduced in 2000 than that in 1987, but those of woodlands, grasslands, salty wastelands and waters were increased. Moreover, the spatial pattern and dynamic change of the regional ecological environment vulnerability are highly related to the Yellow River channel and the coastline, and the Yellow River and the coastline are the dominant factors affecting the spatial pattern of the regional ecological environment vulnerability.
出处
《干旱区研究》
CSCD
北大核心
2005年第3期317-321,共5页
Arid Zone Research
基金
国家教育部〔(教外司留(2002)247号)〕
山东省科技厅(02BS044)项目资助
关键词
景观
空间结构
生态
脆弱性
黄河三角洲
landscape l spatial structure
ecological environment
vulnerabilityl the Yellow River Delta.
作者简介
王介勇（1978-），山东滕州人：在读硕士，研究方向为土地利用变化及其环境效应．E-mail：jieyongw@163．com
