Analysis And Optimum Adjustment On The Agricultural Production Structure Of Yellow-river Irrigated Region Of Hetao Plain In Inner Mongolia

Based on lots of investigations in Inner Mongolia Yellow river irrigated region, and analyzing the present agricultural production structure by qualitative analysis and mathematic method. The author analyzed the flow of energy and material by the method of input-output, analyzed the motive factors of agricultural production structure by the Grey relating degree method, and established optimum model and adjusting strategy by taking the fund and lands the liner programming method as controlled conditions.1.Total input and output energy, and ratio of total output to input energy all appeared increasing trends in farm ecosystem, which indicated that the efficiency of the system energy increased gradually. Ratio of inorganic input to total input energy was higher, over 70%, the fertilizer was the most of all, the ratio of organic to total input energy was lower, under 30 %, the ratio of organic to inorganic input energy was out of balance in the farm eco-system, which indicated the farm ecosystem self-sufficient ability was low. The ratio of total output to input energy was all above 1 showed that the farm ecosystem was the output energy system. The nitrogen and phosphorus circulation were positive equilibrium, the potassium was negative in farm ecosystem, thus, the farm ecosystem material cycle was unreasonable.2.Analyzing the agricultural production structure in this region by Grey relating degree method. In plant, the largest effect factor to the total output value of agricultural was fertilizer in Wuyuan county, Hangjinhou county and Linhe city; in Wulate county, the largest effect factor was the power of machinery for agriculture. In animal husbandry, the largest effect factor to the total output value of agricultural was the amount of sheep livestock on hand in Hangjinhou county and Linhe city; in Wuyuan county, the cow livestock inventories was the main effect factor, the second was the sheep industry; the grassland in Wulate county was the largest. Per capital grassland area was the largest factor of all in this region. The affection of plant to animal husbandry output value showed that cereal output was the positive effect to animal husbandry output value at Wuyuan county, Hangjinhou county and Linhe city, plant value was the positive effect to animal husbandry output value at Wuyuan county. Analyzing countryside industry structure to per capital GDP, the first industry output value was the largest effect to per capital GDP at Wuyuan county and Linhe city, the third industry output value was the largest effect to per capital GDP at Hangjinhou county and Wulate county.3.According to the agricultural production structure at 2002 in this region, by using the liner programming, the optimum adjusting strategy was put forward. Should increase the amount of the milk-cow and decrease the amount of oxen. Strengthening the development of sheep industry and decreasing the pigs. Increasing the plant area of maize with the guarantee of the yield of wheat. Increasing the plant area of sunflower in Wuyuan county, Hangjinhou county and Wulate county. In Linhe city and Hangjinhou county, increasing the plant area of vegetable. After optimum adjustment, the ratio of agricultural net profits to actual net profits were 3.56,3.26,5.42,4.18 in Wuyuan county, Hangjinhou county Wulate county and Linhe city.