Energy Flow Analysis And Present Situation Evaluation Of Different Patterns About Farmland Circulation In Oasis Irrigation Area Of Hexi

The paper was conducted about circular pattern of farmland, the paper adopted the methods of the field measurement, data collection, investigation and questionnaire in order to analyse the characteristics of circular pattern of farmland.6 of 12 categories which was widely distributed, highly profitable and popular promotion were chosen from the 20 circular patterns of farmland. Drawed the picture about circulation pattern and the energy value, and analysed the ecology～economy～social benefits of cyclical pattern of each field. The results showed that:(1) Compared to the other cyclical patterns of farmland, Plantation～breeding～firedamp, installation farming cyclical pattern and the grazing type of breeding～firedamp are the best circular patterns.(2) The priority of evaluating index about plantation～breeding～firedamp is that, output value per unit area, yield per unit area, light use efficiency, net output per capita, water use efficiency, consumption of meat per capita, organic matter balance, per capita grain, phosphorus balance, nitrogen balance, energy input～output ratio,fund input～output ratio, potassium balance;The priority of evaluating index about installation farming cyclical pattern is that, consumption of meat per capita, per capita grain, fund input～output ratio, water use efficiency, output value per unit area , energy input～output ratio, energy input～output ratio, yield per unit area,phosphorus balance,nitrogen balance, potassium balance,light use efficiency;The priority of evaluating index about grazing type of breeding～firedamp is that, output value per unit area, consumption of meat per capita, per capita grain, light use efficiency, net output per capita, water use efficiency, energy input～output ratio,fund input～output ratio, organic matter balance, nitrogen balance, phosphorus balance.(3) Totally the supplementary inorganic energy input of Hexi oasis irrigation was still in higher level than the ratio of organic energy. The energy input～output ratio was higher, if the ratio of organic energy is more than inorganic. In terms of total energy input, Liangzhou is the highest by 5.22×107J/hm2.The ratio of energy output in Minle was higher than Liangzhou, Linze, Minqin. The supplementary of inorganic energy input of Linze was more than Minqin, Liangzhou, Minle. But the supplementary of organic energy input of Minle was the most.The energy input～output ratio of Minle was the most by 4.47 which was 1.06 times than Liangzhou, 1.35 timesthan Linze,1.55 times than Minqin. It had some characteristics as following:①The supplementary of organic was lower.②The supplementary of inorganic was higher than organic.③The energy conversion index was inefficiency, the energy input～output ratio is lower.④The fertility was lower, and the nutrition of soil was imbalance.(4)The characteristics of different cyclical patterns of farmland in Hexi oasis irrigation: apart from individual economic crops, the energy input～output ratio of intercropping patterns was higher than single mode of operation. Except garlic and potatoes, the organic and inorganic ratio was remaining less than 1. That indicates the current cropping pattern of investing was in a relatively high level of inorganic. In variety modes, the inorganic supplementary of economic crops was relatively higher than those common crops. There was no significant difference between the single and multiple cropping pattern. The carrying capacity per unit area of tomatoes, carrots, peppers and potatoes in single cropping pattern were the highest than others. But in multiple cropping pattern the carrying capacity per unit area of Maize～Jujube was the highest than others.(5)The light use efficiency of different circular patterns showed that, in the multiple cropping patterns was higher than single cropping patterns, while the economic cropping patterns was the lowest.