摘要
土地利用/土地覆被变化不仅改变了地表景观结构及其物质循环和能量流动,而且对区域生物多样性和重要生态过程有着极其深刻的影响。通过对怒江流域1985,1995,2000年3个时期的土地利用/覆被空间数据的分析计算,得出近15年来,各土地覆被类型的动态变化信息,并借助景观生态学中的景观格局变化分析模型进一步研究了流域土地覆被变化产生的生态环境效应。研究表明:19852000年怒江流域各土地利用类型及景观格局指数均发生了重要变化。土地利用变化表现出城乡居民工矿用地、耕地、草地明显增加,而林地和未利用地呈减少趋势,反映出流域城镇化进程的加快和生态环境恶化的趋势;景观总体上表现异质性在减小,斑块类型趋于均匀分布的趋势,景观稳定性在降低。
Regional land use/cover changes are an important part of global change, and it directly impacts biological diversity worldwide, contributes to climate change, and affects the ability of biological systems to support human needs by altering ecosystem services. Nujiang watershed is the important region of global bio-diversity and ecological landscape reservation. It is very significant to research the change of land use and cover and its ecological effects in Nujiang watershed. Based on the GIS methods and landscape indices model, ecological environment effect that the regional land covers change produced in study period was analyzed. The conclusions include： land use/cover changes that urban and cultural residences, cultivated land and glass land obviously increase, while forest land showing a tendency to reduce in the watershed in 1985-2000 Reflects the quickening of the watershed urbanization process and trend of deterioration of the ecological environment. Land cover patch spatial pattern in the region has tended to become fragmented. On the whole landscape, the landscape heterogeneity is decreasing and the landscape evenness index is increasing, and the landscape stability is decreased.
出处
《水土保持学报》
CSCD
北大核心
2005年第5期147-151,共5页
Journal of Soil and Water Conservation
基金
国家重点基础研究发展计划(2003CB415105)
