Results show that the visible difference of runoff yield and sediment yield and land cover pattern were found in the up of Huanjian, Heshuichuan and Ruihe.
结果表明：流域北部的环江上游、合水川与汭河的径流量和输沙量以及土地覆被空间格局分布差异显著；
Land cover and its natural alteration, which play an important role in climate system and biochemistry pattern in globe scale, have brought tremendous effect to global entironment.
土地覆盖和土地覆盖的自然变更，在地球系统的气候和生物化学全球尺度模式中扮演着重要角色，对全球生态环境产生着巨大的影响。
The vegetation cover is scattered, and the steep slopes are intensively cultivated, leading to severe soil erosion. In addition, the land use pattern is very complex.
根据川中丘陵区的景观特征和土地利用格局，认为地块应为该区土壤侵蚀研究的基本单元；
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