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| Spatio-temporal variation of eroded landscape in typical small watershed in the hilly region of red soil: A case study of Zhuxihe Small Watershed in Changting County,Fujian Province |
| Zou Aiping,Chen Zhibiao,Chen Lihui |
| School of Geographical Science,Fujian Normal University,350007,Fuzhou,China |
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Abstract Zhuxihe Small Watershed in the hilly region of red soil was chosen as the typical study area.Based on the soil erosion data of 1999 and 2007,the transfer matrix of eroded landscape types were extracted by using ArcGIS 9.0 software,and the spatio-temporal variation of eroded landscape was analyzed by using barycenter transfer model.The analyse on watershed landscape variation will provide important bases for ecological construction in future.The statistics on areas and percentages of landscape types show that slight erosion has been dominating landscape pattern inlaid by some small pieces of light,moderate,strong,very strong and severe erosion in 1999 and 2007.The analysis on transfer matrix of landscape pattern shows that the areas of slight and light erosion increased,among which the slight erosion in the eastern part of watershed increased most greatly with most stemming from light erosion.It is found that the areas of moderate,strong,very strong and severe erosion decreased,among which the area of severe erosion decreased most rapidly,and it has resulted in the converting of severe erosion into moderate erosion.This phenomenon mainly appears in the sub-watershed of upper reaches of Zhuxihe Small Watershed,including Youwuzhen and Gaopiduan. The study on barycenter transfer model indicates that the barycenter transfer distance of severe erosion was the furthest from 1999 to 2007,the barycenter transfer direction of light,moderate and very strong erosion was southwest,and the barycenter transfer direction of strong erosion was southeast,only the barycenter transfer stern vally direction of slight erosion was northeast.Human activity is the main driving factor for the dynamic variation of spatial pattern of landscape in this area.
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Received: 06 July 2008
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