Dynamic Landscape Pattern of Land Use and Soil and Water Loss in the Ertan Reservoir Area of Yanbian County

CHEN Jun-hua; HE Zheng-wei; XIANG Cheng-hua; XU Huixi; ZHANG Xin-hai; TU Dai-lun

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Dynamic Landscape Pattern of Land Use and Soil and Water Loss in the Ertan Reservoir Area of Yanbian County

- Dynamic Landscape Pattern of Land Use and Soil and Water Loss in the Ertan Reservoir Area of Yanbian County
- Bulletin of Soiland Water Conservation Vol. 27, Issue 5, Pages: 75-80(2008)
- 作者机构：
  
  1. 成都理工大学,四川,成都,610059
  2. 四川省林业科学研究院,四川,成都,610081
  3. 盐边县林业局 , 四川盐边,617100
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2008
- 稿件说明：
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CHEN Jun-hua, HE Zheng-wei, XIANG Cheng-hua, et al. Dynamic Landscape Pattern of Land Use and Soil and Water Loss in the Ertan Reservoir Area of Yanbian County[J]. Bulletin of Soiland Water Conservation, 2008, 27(5): 75-80.
DOI：

CHEN Jun-hua, HE Zheng-wei, XIANG Cheng-hua, et al. Dynamic Landscape Pattern of Land Use and Soil and Water Loss in the Ertan Reservoir Area of Yanbian County[J]. Bulletin of Soiland Water Conservation, 2008, 27(5): 75-80. DOI：

摘要

利用1988

1999和2003年3个时段的TM

ETM+遥感数据

在GIS和FRAGSTAT景观分析软件的支持下

对二滩库区(盐边)的土地利用景观格局和水土流失动态特征进行了定量分析。结果表明

(1)耕地面积减少

所占百分比呈下降趋势

而有林地、灌木林地、草地所占百分比呈上升趋势。(2)耕地的斑块数目增加

平均斑块面积在减少

斑块密度上升;有林地的斑块数目减少

平均斑块面积增加

斑块密度下降;草地的斑块数目不断增加

平均斑块面积增加

斑块密度下降。说明耕地向不断破碎化发展而有林地、草地呈现持续扩张的空间集中化特征。(3)耕地、有林地、灌木林地、疏林地面积加权的平均斑块形状指数略有下降

斑块形状趋于简单化

而草地的该指数上升

斑块形状趋于复杂化。(4)从景观水平上看

景观格局变化总体特征是斑块数增加

拼块平均面积减少

斑块密度增加

最大斑块指数减少

说明景观破碎度增加。蔓延度降低

散布与并列指数增加

说明景观类型的相互关系变得复杂

镶嵌度增加。(5)景观多样性指数和土地利用相对合理指数增加

坡度较大的地区

耕地面积明显减少

相应地林地、草地面积明显增加

整体上土地利用结构趋于合理。(6)研究区强度以上水土流失面积15 a来减少了23.02km

减少率为15.13%

水土流失强度向低层次转变。说明随着水库的修建蓄水

加上天然林保护工程、退耕还林工程的实施

二滩库区的水土流失明显好转

生态环境逐渐得到改善。

Abstract

Based on GIS and landscape pattern theory

dynamic landscape pattern of land use and soil and water loss in the Ertan Reservoir area of Yanbian County were analyzed using translated data from remote sensing images in 1988

1999

and 2003.Results showed that the area percentage of farmland decreased obviously

while the percentage of woodland

bush-land

and grassland increased.The patch number of farmland increased and its mean patch area and patch density decreased.The patch number of woodland decreased

its mean patch area increased

and its patch density decreased.The patch number of grassland and its mean patch area increased and its patch density decreased.The AWMSI of farmland

woodland

bush-land

and sparse forestland decreased slightly and its patch shape became simple.The AWMSI of grassland increased and its patch shape became complicated.In view of the land-level

the general characteristics of landscape pattern change were that the patch number and patch density increased

while the mean patch area and LPI decreased

indicating an increase in fragmentation degree.The CONTAG decreased

while IJI increased

implying an enhanced connectedness of landscape.Landscape diversity and relative land use rationality index increased

indicating that an improved land use structure.Soil and water loss status in the Ertan reservoir area of Yanbian county was improved greatly from 1988 to 2003.

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