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以重庆南川区为例,利用TM遥感影像、Arcgis和Erdas软件,运用地图代数原理,采用图像数据转移矩阵计算,结果表明从1988年到2000年水土流失增强面积为9605.89 hm~2,减弱面积为79947.85 hm~2;石漠化强度增强面积为15078.92 hm~2,减弱面积为12492.53 hm~2。石漠化是水土流失长期作用的结果,水土流失是石漠化形成过程的阶段性表现,二者在成因上存在因果关系,但在生态治理恢复的过程中,水土流失减弱面积与石漠化减弱面积的变化不同步,在时间上存在滞后关系。造成这种滞后的现象,原因是石漠化土地生态的恢复过程较水土流失土地的长。
Taking Nanchuan District of Chongqing as an example, using TM remote sensing images, Arcgis and Erdas software, using the principle of map algebra and image data transfer matrix, the results show that the area of soil erosion increased from 9605.89 hm ~ 2 from 1988 to 2000, 79947.85 hm ~ 2; the intensity of rocky desertification enhanced area was 15078.92 hm ~ 2, and the weakened area was 12492.53 hm ~ 2. Rocky desertification is the result of the long-term effect of soil and water loss. Soil and water loss is a staged manifestation of the formation of rocky desertification. There is a causal relationship between the two. However, in the process of ecological restoration, the area of erosion and rocky desertification Weakening the area of change is not synchronized, there is time lag relationship. The reason for this lag is that the process of the restoration of land ecology of rocky desertification is longer than that of soil erosion.