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| Dynamic analysis on the spatial pattern of landscape of small watershed in loess hilly-gully region:A case study of Shanghuang test area in Guyuan |
| Hao Shilong 1,2 , Li Bicheng1, Zhao Xiaomin2, Yu Qiang2 |
| 1.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi;2.College of Land Resource and Environment, Jiangxi Agricultural University, 330045, Nanchang;3.Institute of Geographical Sciences and Natural Resources Research, China Academy of Sciences, 100101, Beijing: China |
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Abstract In order to provide reference for reasonable use of land resource and regional sustainable development in loess plateau, taking Shanghuang test area as the study area, some landscape diversity indexes were attained under the support of GIS technology. Utilizing the indexes such as patch size and amount, average fractal dimension, patch extension index, diversity index, dominance, consistency degree and fragmentation, the dynamic changes of landscape diversity in the loess hilly-gully region during the past 10 years were analyzed. The results showed that the total number of patch increased by from 1995 to 2004, among which, slope farmland and crude grass land decrease by 19 and 12 respectively, the artificial grass land and terrace farmland increase by 15 and 9 respectively, the average area and perimeter of patches decrease by 0.14hm2 and 185hm2 separately, the patch fractal dimension of terrace, crude grass land, woodland, orchard and village decrease in different degrees, slope farmland, artificial grassland, shrub land and unutilized land increase slightly, the irrigable land, plain, arbor land and water area were kept up. The characteristics of landscape heterogeneity are depicted that the consistency degree and diversity index decrease by 5.86 and 0.25 respectively, while the fragmentation and dominance increase by 0.25 and 0.002 respectively. The degree of man-made interference increases by 1.95. The landscape ecosystem mainly composed of farmland and grass has already changed in to highly heterogeneous landscape ecosystem mainly composed of forest and gross. Human activity is the main driving factor for the dynamic changes of spatial pattern of landscape in this test area.
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Received: 17 August 2004
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