基于RS与GIS的福建长汀县土壤侵蚀时空变化研究

Spatiotemporal Change of Soil Erosion in Changting County of Fujian Province Based on RIS and GIS

在遥感影像解译福建长汀1988、2000、2007年土壤侵蚀数据及相关研究数据的支持下,基于RS与GIS技术,分析了研究区近20年中土壤侵蚀的时空变化及与不同地理因子间的相关分异规律.结果表明:1)研究区土壤侵蚀总体好转,特别是2000—2007年间,强度以上的侵蚀面积大幅下降.2)研究区土壤侵蚀与坡度相关性不明显,缓坡是研究区土壤侵蚀严重区域,这与该地带多为坡耕地,人类活动影响剧烈有关,土壤侵蚀主要发生在侵蚀性红壤、粗骨性红壤、粗骨性黄壤等分布区,由于利用方式改变造成水稻土分布区也出现高侵蚀率.3)植被覆盖度的不断增加与土壤侵蚀强度及侵蚀面积呈显著的负相关关系.

Based on RS and GIS,the paper analyzes the spatiotemporal changes of soil erosion in Changting county ofFujian province from 1988 to 2007.The results are shown in the following aspects.（1） The soil erosion area at Changting county presents a decreasing trend from 1988 to 2007,especially from 2000 to 2007,and the intensity of acute and extremely intense soil erosion reduces evidently.（2）The soil erosion are mainly distributed in erosed red soil,skeletal red soil and skeletal yellow soil.With the change of the land utilization,the paddy soil areas are hit by high erosion rate.（3） There is no obvious correlation between the soil erosion with slope.The serious erosion area is on the Gentle-slope ploughing land,where the people intensely work on.（4）There is negative correlation between vegetation coverage degree and soil erosion intensity.In a word,the soil erosion in Changting county is influenced intensively by the human activities.