PROGRESS IN GEOGRAPHY ›› 2009, Vol. 28 ›› Issue (2): 207-215.doi: 10.11820/dlkxjz.2009.02.007

• Original Articles • Previous Articles     Next Articles

Dynamic Analysis of Land Use and Landscape Pattern Changes in Guinan County, Qinghai, in the Past 30 Years

HAN Haihui1, YANG Taibao1,2, WANG Yilin1   

  1. College of Resources and Environment, Lanzhou University, Lanzhou 730000, China;
    2. Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University 730000, China
  • Received:2008-11-01 Revised:2009-02-01 Online:2009-03-25 Published:2009-03-25


Based on Landsat satellite remote sensing data in growth season of 1977,1999 and 2007, we had monitored LUCC in Guinan County from 1977 to 2007 by RS, GIS and landscape ecology. Then, we calculated land use transform matrix and a set of landscape indices to analyse changes. The results show that from 1977 to 2007, noticeable changes in land use and land cover change (LUCC) occurred in Guinan County. There was a decreasing tendency in grassland, especially for high coverage grassland near Mangqu and Senduo, the degradation persisted throughout the 30 years; however the middle coverage grassland was reclaimed to farmland in prophase, then some farmland was returned to middle coverage grassland again in anaphase because of implementation of the national project for returning farmland to rangeland. So, the area of farmland was ascended in prophase and was descended in anaphase, but it kept a decreasing tendency in the mass. Meanwhile, woodland on east and south mountain of Guinan was increased, and the construction of the Longyangxia reservoir led to flooding of some low coverage grassland and rocks. After 2000, the area of sandy land was controlled along with the implementation of the national project. Between 1977 and 1999, the landscape fragmentation and landscape heterogeneity of the study area were increased, and the dominant patch was scattered. After 1999, the trend of landscape fragmentation was slow and the dominant patch was gathered again because of implementation of the project. Those changes in Guinan County were caused by nature and human activity. However, the human's contributions are great, such as the increase of population for human and livestock, such as the unreasonable exploitation of grassland and the excessive grazing.

Key words: Guinan County, land use and land cover change (LUCC), landscape pattern, patch, RS