Study On The Characteristic And Potential Productivity Of The Slope Dry Cultivated Land In Sichuan Province

As a typical agricultural and population province,slope dry cultivated land play a very important effect in agriculture production of Sichuan province.However,there exist serous production and ecology problems under the general influence of natural and artificial factors. The situation such as attenuated cultivate soil,large proportion poor soil,serious soil and water loss and lean soil nutrition not only intensify drought and flood of Sichuan province,but also aggravate the drought and flood of the lower Yangtze Region.Consequently,further research slope dry cultivated land of Sichuan province has very important practical significance.This paper analyze the distribution and utilization condition of slope dry cultivated land,study the use characteristics by the slope farmland and reserve resources of cultivated land investigation platform.After all,the result showed as follow:1.There is a big amount slope dry cultivated land in Sichuan province which account for 52.41% of the whole farmland,thereinto,2～6°dry land amount is 336791.90hm~2 and account for 5.6%of farmland;6～15°dry cultivated land amount is 1270627.11hm~2 and occupy 21.13%of farmland;15～25°dry cultivated land quantity is 1157151.83hm~2 and account for 19.14%of farmland;and the over 25°land amount is 386943.01hm~2 which occupy 6.43%of cultivated land.2.Slope dry cultivated land reduced 439523.57 hm~2 from 1996 to 2004.The decrease part in chengdu plain is in 6～25°slope dry cultivated land;the decrease part in hilly area is in 6～15°and more than 25°slope dry cultivated land;15-25°land increased 20718.22hm~2 in plateau region which cancellated the decrease amount in other grade;decrease part in mountain area is in 15°and over 15°slope dry cultivated land.3.Less content of organic matter,nitrogen,phosphorus in purple soil and yellow soil induce lower soil fertility of Sichuan slope dry cultivated land.4.There is variety utilization methods and multiple cropping patterns in slope dry cultivated 0and.The dry crop which include wheat,maize,sweet potato distributed in hilly and mountain area,and two crops a year or three crops a year are the main farming system.5.There is a lower yield in the lope dry cultivated land,and big gap between the unit area yield of wheat,maize,sweet potato,soybean and the average level of Sichuan province.Production capacity change greatly among different landform areas.The dry crop production of chengdu plain,hilly area and plateau region is higher than mountain area.6.The research estimates the lope dry cultivated land production potentiality by mechanism method.The production potentiality of wheat,maize,sweet potato,soybean are 6456.89 kg/hm~2,8138.89kg/hm~2,16871.78kg/hm~2,4554.33kg/hm~2.There is a certain distance between production potentiality and actual capacity.Dry sloping land has larger production space.Based on these analyses,Some countermeasures were pointed out for ensuring the Sichuan food security and scientific,sustainable utilization of slope dry cultivated land.