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利用1958、1975、1982、2000年4期的土壤侵蚀强度等级图,空间配准及矢量化后,制成栅格分类图。在IDRISI 的CROSSTAB模块下分别计算了1958年到1975年,1975年到1982年及1982年到2000年的土壤侵蚀等级转换矩阵。根据该矩阵对兴国县土壤侵蚀的情况分期地进行了定量分析。结果表明:在研究的时期内,兴国县的土壤侵蚀经历了三个主要过程:1958年到1975年的侵蚀加剧期,1975年到1982年的自然恢复期,1982年到2000年的全面恢复期。到2000年,强度侵蚀的面积明显减少,无明显侵蚀的面积已达到全县面积的74.7%,严重土壤侵蚀状况已基本得到了控制。
The soil erosion intensity maps of 1958, 1975, 1982 and 2000 were used to make a grid classification map after space registration and vectorization. Soil erosion scale conversion matrixes from 1958 to 1975, from 1975 to 1982, and from 1982 to 2000 were calculated under IDRISI’s CROSSTAB module. According to the matrix, the soil erosion in Xingguo County was quantitatively analyzed in stages. The results show that during the study period, soil erosion in Xingguo County went through three major processes: the period of erosion intensified from 1958 to 1975, the period of natural recovery from 1975 to 1982, the period of full recovery from 1982 to 2000 . By the year 2000, the area of intense erosion has obviously decreased, and the area without obvious erosion has reached 74.7% of the total area of the county. The serious soil erosion has basically been brought under control.