摘要
以湘江流域中上游地区1980和2000年景观图为基础,运用ArcGIS9.0与Fragstats,对湘江流域中上游20年间的景观格局及其变化进行了分析。结果表明:20年间,受人类活动影响,水田与林地景观面积减少,斑块数目增加,破碎度增大,旱地和草地的斑块数减少,破碎度下降,研究区景观整体破碎度降低;优势斑块的连通性下降,景观优势类别对景观整体的控制作用减弱;分析研究区不同高程分带的景观格局变化发现,在上游山地区,有较大面积的林地被开垦为旱地,从而加大了该区水土流失的风险。
Based on the landscape maps of the upper and middle reaches of Xiangjiang River 1980 and 2000, and supported by ArcGIS 9.0 and Fragstats, this paper studied the evolvement of landscape pattern in this region. The results showed that in 2000, paddy field and forestland had smaller areas but more patches, with a higher fragmental degree because of intensive human activities, while dry land and grassland had a decreased number of patches and decreased frag- mental degree, compared with those in 1980. The connectedness and dominance of primary patches were lower, with a weaker controllability on the whole landscape. In the upper reaches, a larger area of forestland had been cultivated into dry land, which could aggravate the risk of soil erosion.
出处
《生态学杂志》
CAS
CSCD
北大核心
2007年第11期1822-1827,共6页
Chinese Journal of Ecology
基金
中国科学院知识创新工程重要方向资助项目(KZCX2-SW-415)
关键词
景观格局
景观指数
演变
湘江流域中上游
GIS
landscape pattern
landscape indices
evolvement
upper and middle reaches of Xiangjiang River
GIS.
