| "Four-in-one" eco-agricultural model is one kind that has a rapid development in north China in recent years. The model which ingeniously used added-ring technology of the food chain, composed integrated with sunlight greenhouse, animal house, toilet and biogas cellar, the model changed traditional solo planting method into organic combining with planting and breeding together, realized multi-circle utilization of organic matter by ferment function of biogas cellar. The model realized gas producing in pace with manure-accumulation together, and was a production mechanic in whole year combining \\ith planting and breeding which was also good to environment protection in the same field. The model could effectively solve the supplication and utilization of energy resources, could protect eco-emoronment of the rural region, and promote the rural economy to quickly and healthy development as well. It has important significance for agricultural development of rained agricultural region in north China where are also shortage of fuel, fertilizer and forage, have adverse eco-environment, and are backward in economic development.Based on defined "four-in-one" eco-agricultural model as an integrated eco-system. The paper has studied on energy flowing of the "four-in-one" eco-agricultural system in 2001, the results are listed as follow.1. In whole growing season, the input energy of the "four-in-one" eco-agricultural system added up to 1109820MJ, the percent of solar energy and the auxiliary energy are respectively 93.43% and 6.57%; the output energy added up to 25630MJ; the ratio of input/output of energy was 43:1; the sequence of output energy were the breeding system, the ferment system and the planting system, the percentage of output energy were respectively 45.65%, 28.28% and 26.07%.2. In planting system, the harvested fruits were 1321 .Okg, corresponding to 188.89kg dry material and 2240MJ output energy; the produced straw were 1144.26kg, corresponding to 186.07kg dry material and 3500MJ output energy; the roots were 377.10kg, corresponding to 50.23kg dry material and 9400MJ output energy; the total biomass were 2842.36kg, corresponding to 355.19kg dry material and 6680MJ output energy. The average biomass yield was 7.36kg/m:!, and the average economic yield was 3.93 kg/in1. The percentage of the output energy for economic production of total fixed energy was 33.53%. The primary productivity (E%) was 1.37%.3. In breeding system, the input forage was 1451.58kg, corresponding to 17820MJ input energy; the output of pig was 451.44kg, corresponding to 11700MJ output energy; the output of excrement and urine was 3652kg, corresponding to 13100MJ output energy. The ratio of forage/pig was 3.75:1; the ratio of input/output of energy was 1.52:1 ;the ratio of forage/meat was 4.30:1. The forage use efficiency was 21%.4. In the ferment system, the input of excrement and urine was 11448kg, corresponding to 41540MJ input energy; the output of biogas gas was 124.7mJ, corresponding to 2610MJ output energy; the output of biogas slurry was 6000kg, corresponding to 460MJ output energy; the output biogas residues was 3300kg, corresponding to 4180MJ output energy; the total output energy was 7250MJ. The ratio of input/output of energy was 5.72:1; the transform percentage of energy was 17.45%.5. The auxiliary energy included in biological energy subsidies and industry energy subsidies: the biological energy subsidies was main part of auxiliary energy, amount to 88.40%; the most input of industry energy subsidies was indirect industry energy subsidies which was 11.60% of the total auxiliary energy, the direct industry energy subsidies was 0.18%. Besides, organic matter and forage occupied the important part in auxiliary energy, respectively amount to 59.98% and 24.43%.6. In sunlight greenhouse, heat were lost by three ways in the night, including on front side heat loss, soil horizontal conducting heat loss and crevice heat loss. The ratios were 10.6:2.7:1.0.Besides, another experiment was conducted,...
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