| 鄂尔多斯高原沙地草地荒漠化景观现状的定量分析 |
| 摘要点击 1297 全文点击 1529 投稿时间：2000-11-07 修订日期：2001-03-01 |
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| 中文关键词 荒漠化 植被盖度 半方差 分形 鄂尔多斯高原 |
| 英文关键词 desertification, vegetation cover, semivariance, fractal, Ordos Plateau. |
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| 中文摘要 |
| 基于相互垂直的2条5km长的样线的野外调查,分析了鄂尔多斯高原东南部地区沙地草地的景观现状.对2条样线上的斑块出现的频度的统计分析表明,该地区景观以小尺度斑块为主,有95%以上的斑块直径小于50m,平均斑块直径只有15m,但仍有较大面积的流沙斑块存在.对沿样线的裸地百分比盖度的半方差分析揭示了该区域荒漠化景观依赖于空间尺度的环境异质性,所调查的沿样线裸地百分比盖度的分维,接近于2,说明其空间异质性主要集中在较小的尺度上.这说明该区景观较为稳定,但沙化面积有扩大的趋势. |
| 英文摘要 |
| The landscape condition of the sandy grassland in southeast of Ordos Plateau was analyzed based on the data from field investigation along two intercepting 5 km transects. Summary on frequency of the patches showed that small scale patches were prominent in this area, with 95% of total patches smaller than 50m and average dimension of patches 15m, while there were also a couple of large scale mobile sandy patches. Environmental heterogeneity dependent on spatial scales was revealed by semivarogram in the sampling area. The large fractal dimensions of percent coverage of bare ground, close to 2, indicated dominant small scale spatial variance. This result implies a relative stabilized landscape and also a desertified area. |
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