红壤丘陵区土地利用变化对土壤质量影响

INFLUENCE OF LAND USE CHANGES ON SOIL QUALITY IN HILLY REGION OF RED SOIL

以鄂南红壤丘陵典型区的三个村为代表 ,应用地理信息系统对 1981和 1998年两个时期的土地利用变化和土壤质量进行对比研究 ,分析了土地利用变化对土壤质量的影响。结果表明 :研究区土地利用结构总体上具有农业型特点 ,17a间水田减少了 2 1% ;其余的利用方式则有不同幅度的增加 ,居民地、水域、林地、园地和旱地增加了 4 2 .2 %、99.6 %、8%、5 6 .8%和 8%。土壤质量有从优劣两端向中等靠拢的趋势 ,17a后 、 、 和 等地面积分别减少 18.6 %、12 .2 %、2 9.6 %和 2 5 % ; 等地增幅达 5 1.9%。土地利用方式及管理措施是影响土壤质量演变方向和强度的关键因子 ,园地和林地的土壤质量大多得到明显改善 ,水田的Δ SQI多数呈下降的趋势 ,旱地的土壤质量变化比较复杂 ,与土地利用结构相关。依此 。

In order to analyze the influence of land use changes on soil quality, three villages in Heshengqiao Town were selected as a case study of hilly red soil region in South Hubei. By comparing the soil quality and land use changes from 1981 to 1998 with GIS, the results showed that the land use structure still had agricultural characteristics. During this period the area of paddy field decreased 21%, however residential land, water body, forest, orchard and upland increased 42.2%, 99.6%, 8%, 56.8% and 8% respectively. The area of high and lower classes of soil quality appeared to decrease, while middle class to increase, the first, second, fourth and fifth class decreased in the area by 18.6%, 12.2%, 29.6% and 25% respectively, and the third class increased 51.9%. Land use and management practices greatly affected the change of soil quality, in which orchard and forest land was dominated by improvement, while $ΔSQI$ (change of soil quality index)of paddy soil decreased.The $ΔSQI$ of upland change was very complex, with cropping system being the major factor. According to these results, some suggestions of soil sustainable utilization were proposed.