Comparative Study On Functional Efficience The Main Cropping Patterns Of Rice Paddy In Hunan

The study analyzed the rice ecosystem of Hunan. The particular data of the main local cropping system was gathered extensively by the statistical data, field investigation and questionnaire survey. Twelve kinds of representative typical rice paddy ecosystem in Hunan were comprehensive evaluation by weight exponential method, and their energy, nutrient equilibrium and economic effects were analyzed by inciting the former research production and inspecting in doors.Results was followed:1 Analyzing 12 cropping patterns from energy balance angle can know: the ratio of inorganic input to organic input in Hunan field ecosystem was 4:5 and 2/3 energy was outputted as economic products. It was most of organic inputting into field in whole Hunan rice ecosystem. In the middle of artificial supplemental energy investing, flue-cured tobacco - late rice inputted inorganic energy with bigger proportion, capsicum - single late rice inputted organic energy with bigger proportion, elephant grass and rape/watermelon-single late rice can input most energy, and had hight2 Analyzing 12 cropping patterns from nutrient balanced angle can know: fertilizer of Hunan field was used with relatively high proportion. Nutrient inputting was mainly on the fact, and throwing field benefit was generally better, but phosphorus benefit was relatively lower benefit phosphorus. The highest benefit of throwing field was white-gourd - single late rice, the lowest was rape - rice - rice and flue-cured tobacco - single late rice.3 There was higher output value in Hunan field ecosystem in terms of economic benefits of 12 cropping patterns, and the net output accounts for about 4/5 of the gross output value. Cost of Hunan field was mainly materialization cost, accounting for 1/3 total cost, capsicum -single late rice and potato - mid-season rice had the most heavy of Cost investing, rape / watermelon - late rice was a kind of good pattern with high output value. As a kind of traditional cropping pattern. Oil - rice - rice, its gross output value, net output and proportionthat the net output account for among the gross output value were all minimum as to other planting modes.4 Hunan 12 cropping patterns gave a mark to be 24.37 equally the average economic benefits marked, to be 25.7 equally ecological benefits, and social benefit give a mark as 6.36 equally. Each plant the order of the comprehensive benefit of the pattern: elephant grass > rape / water-melon - the single late rice> wax gourd - single and late rice> capsicum - single late rice> soybean + maize - single late rice> soybean - single and late rice> maize - single late rice> potato mid-season rice> rape mid-season rice >peanut - single and late>, flue-cured tobacco - late rice> oil - rice - rice.