| The three gorges projects construction had far-reaching effect to the storehouse district ecosystem. In case the unsuitable management will be able to arouse the ecosystem deteriorate in three gorges storehouse district in some degree. As a matter of fact, since some unrightful farming tillage on the cultivated land of slope, the ecosystem of storehouse district has been damaged.The Changjiang River is directly runed after Shizhu county 22km., there are 52 rivers in Shizhu county drift into the Changjiang River and Wujiang River. The Shizhu county pertains to the farming county of mountain area, it also is the great county of Chinese traditional medicine manufacture. One of the main properties was Coptis chinensis Franch in Shizhu county, ten thousand peasant householies depend on it. 2001 Year counts that the result makes known, The Coptis chinensis Franch value of output has seizied Shizhu county farming total output value 15-20%, 12% of whole county GDP. The planting pattern of Coptis chinensis Franch was chopping forest to build shed in Shizhu county many years ago.The method of build wood shed growing Coptis chinensis Franch, when grew 1hm2 Coptis chinensis Franch, require 150m3 timber, choping3hm2 woodland.This paper investigated the soil state and soil fertility changes of planting Coptis chinensis Franch in the interest of the selection Coptis chinensis Franch pattern to supplys the scientific foundation; at the same time to supplys furthermore scientific knowledge of rightful pattern growing of Scale manufacture, accelerate the Shizhu county Coptis chinensis Franch development.Moreoverin the interest of Chongqing the Coptis chinensis Franch ought to grow that the district economy to supply the development pattern.Finally in the interest of the district in the three gorges storehouse ecology environment security and the ecology economic system is reconstruct suppling the basic theory foundation.This research adopted the method of interior test and outside test. We established the minisize district on the Coptis chinensis Franch to observe soil erosion and erosion state in the growing process of Coptis chinensis Franch. Interior analysis of the sampling was used by the USLE equation forecaste the soil erosion of the Coptis chinensis Franch land; At the same time we had tested the soil physical property, soil fertility, soil exchangeable base foundation distributes of the two Coptis chinensis Franch planting pattern.The result of forcarst by the USLE equation as follows : Erosion modulus was 8.8835t hm-2 a-1 on L2, 6.1004 t hm-2 a-1 on G2, soil errosion intensity was of tiny degree; erosion modulus was 35.5601 t hm-2 a-1 on L1, 45.18941 hm-2 a-1 on G, soil errosion intensity was of strong degree; erosion modulus was 68.7429t hm-2 a-1 on G6, 62.73121 hm-2 a-1 on G1, soil errosion intensity was of superstrong degree; erosion modulus was 80.8018t hm-2 a-1 on L6, erosion intensity was of intensity degree; soil erosion amount of GC2 , L3 , L, G3 were 0 .Above analysis made known, soil erosion was chiefly happened on the first year of Coptis chinensis Franch growed , secondly was on the derelict land and the tilth.; If we growed tri-leaf on the land after the Coptis chinensis Franch harvests would decrease erosion obviously. Contrastd with the woodland, the cultivated land is the main erosion source of Shizhu county.The result of the farm observes have been known, we observed runoff on L6 and G in the same rainfallbut the forcast result by USLE that the soil erosion was 0 except for L2-L3 , L, G3 ,GC2. The result of the farm observed made known, soil erosion were chiefly happened on derelict land and tilth.The earth mechanical analysis as follows:: The soil disperses coefficient was decreasing with the growing years, >0.25mm and <0.01mm soil aggregate was increased with the growing years.Soil organic matter and total nitrogen have been desclined a little in the pattern of woodland, but enhanced obviously in the pattern of cultivated land. Although the content of phosphorus a...
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