泥河沟流域农林复合生态系统景观格局变化研究

以淳化县泥河沟流域为研究对象,利用该区1986年和2004年的土地利用现状图,在A rc/in fo和A rcveiw软件支持下,对该流域18 a来农林复合生态系统景观格局的变化进行了研究。结果表明,除水域不变外,林地、草地和未利用地面积均减少,其他用地面积有所增加,尤其是居民地企业及交通用地增幅最大,达47.48%;流域的斑块数量减少,斑块形状趋于复杂,多样性指数增加,景观的破碎程度加大,景观格局正朝多极化和破碎化方向发展。

Landscape Pattern Variation of Agro-forestry Ecosystem in Nihegou Watershed

Based on the land use map of 1986 and 2004,changes of the agro-forestry ecosystem landscape pattern in Nihegou watershed during the eighteen years were studied by Arcview and Arc/info software in the paper.The results showed that all other kinds of patches except water area changed obviously in area,number,figure etc.The areas of forest land,grassland and non-using land decreased,however,areas of all others increased,especially the residential land and road area increasd by 47.48%.During 18 years,the total number of patches decreased slightly,the shape of patches became more complex.Both diversity index and fragment index increased.The analysis indicated that the landscape pattern of agro-forestry ecosystem in this region was tending towards multipolar and fragmenting development.