Dryland does most in global carbon cycling because it occupies 40% of the earths surface.

干旱土壤占全球陆地总面积的40 %，因此，它在全球碳循环中占有重要的地位。

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In north of China, Latosol-like soils which were exposed to the earths surface were developed from red Paleosol and red paleo-weathered crust.

现今出露于中国北方地表的红色土壤是在红色古土壤和红色古风化壳上发育的，而且大多经历了不连续的成土过程。

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The earths surface observation is extended to the region beyond the source with a methodof sphere surrounding three-dimensional finite source.

用梭形旋转曲面包围三维有界场源，将位场的地表观测值延拓到场源之外的空间区域。

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