| At present, soil erosion has already become the global public hazards, threaten human existence and development seriously, Become one of the focused question that every country in the world pays close attention to generally. During present ecological environmental construction, that one in the rural ecological environmental construction must be required to choose suitable agriculture plant mode, and it is also an important measure to the soil and water conservation.Abrupt slope soil erosion of cultivated land is the main base of soil erosion of Three Gorges reservoir area and main source of putting the silt in storage. It is average for erosion modulus 7500 t /( km2·a), average erosion quantity is 94,500,000 t/km2, put quantity more than 18,900,000 t/km2 in storage silt at corroding amount. After building up according to 175 m water level schemes in the Three Gorges reservoir area, the per capita area of cultivated farmland will be by 0. 073 hm2 drops to 0.063 hm2, the cultivated land pressure will be strengthened further.For the new method to probe soil erosion comprehensive administration of cultivated land of abrupt slope of Three Gorges reservoir area, this text uses sustainable development theory, the ecosystem principle, socioeconomic theory to the concrete conditions of the Three Gorges reservoir area, climate, adopt the planting mode that agriculture and forestry compound in the living beings hedge to the comprehensive administration of Three Gorges reservoir area. Because agriculture and forestry compound living beings hedge is greatly influenced by synthesize environmental factors such as stand, weather, soils, topographies, ground forms, etc. It has very strong region quality, so this page is only suitable for the Three Gorges reservoir area, but cannot be the mode generally exist.Observed from this text through the localization for one year in succession from February of 2003 to April of 2004, on taking a sample in the field, analyses in the city, analyses with mathematics appraises and the gray related analyses, through appraising and study and suit the agriculture and forestries of Three Gorges reservoir area compound living beings plants mode by hedge systematically, draw the conclusion: this mode is of highly economic benefit, highly water and soil conservation benefit, raising income and extensively be suit for the administrative skill and mode for the abrupt slope of Three Gorges reservoir area cultivated land utilization and protection. Observe and appraise project including the physics and chemistry nature and benefit to prevent water and soilosing. the result of study shows:1) From the investigation, analysis and appraise of the Agriculture and forestry compound hedge mode in the Three Gorges reservoir area, this mode will make the land resource utilized singly to move towards synthesizing utilizing, effective way which moves towards intensive farming that it is planted, manage extensively that the single cropping moves towards pluralism.(2) The agriculture and forestry compound hedge mode of living beings is traditional crops plant mode, this mode cause to heavy soil and water loosing , erosion amount ,and consume soil land fertility greatly, so it must be changed.(3) Good woods compound living beings conserve water and soil, improve soil, raise land utilization ratio and increase land productivity by hedge mode, reach and get very good ecology, economy and social benefit.(4) The key technology of agriculture and forestry compound hedge mode is choose proper living beings and combine the leading industry in the locality, fully utilize the natural disposition of the looks between species, avoid a gram of quality of looks at the same time, and to make relation coordinate and accelerate material flow and energy flow unblocked flow, give play to greatest benefit.(5) Implement agriculture and forestry compound living beings hedge mode obviously improve soil structure, reduce soil capacity and increase porosity, improve the soil holding skill greatly. Being compare...
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