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《RESOURCES AND ENUIRONMENT IN THE YANGTZA BASIN》 1999-02
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CHARACTERISTICS OF INTEGRATED AGROECOSYSTEM AND ITS CONSTRUCTION IN THREE GONGES RESERVOIR AREA

Yang linzhang; Li Yundong(Institute of Soil Science, The Chinese Academy of Sciences, Nanjing, 210008) Zheng Qinyu ;Wu Wenbin(China Southwest Agricultural University, Chongqing , 630716)  
A field experiment was conducted to deal with the characteristics of integrated agroecosystems in Three Gorges Reservoir Area in upper region of Yangtze River. Based on ecological principle and intercropping technology, several integrated agroecosystems such as wheat - malie-sweatpotato, wheat-vegetable, citrus intercropped with wheat and different rice rotation systems weredeveloped in this region. The experimental results revealed that the output and economic benefitof wheat intercropped with vegetable were increased by 40% - 47% compared to the normalwheatrmaize-sweat potato cropping system in upland soils. The rice yield in single riceduck-fish system reached at 9 540 kg/hm2, 12. 5 % higher than rice alone system. The economic ratio of output/input was 3. 92 in rice-fish system, 3. 81 in rice-duck-fish system and 4. 72in rice-straw berry system, respectively, which was 50% higher than the rice alone system.Additionally, the harmful effects infected by injurious insects were retarded at great extent inrice-fish or rice-duck system and the harmful weed in rice field was reduced, so that the pestifcide and herbicide application could be reduced in these systems. By practising rice-duck orrice-duck-fish system for several years the soil properties were improved, especially the organicmatter and total nitrogen content, available nitrogen and phosphorous in rice field were increasedsignificantly. Therefore, to develop different lute.rcropping systems in upland and different riceoriented rotation systems in rice field can increase the crop yields and get a high economic benefit,so that the Income of local farmers can be increased at some extent.
【Fund】: 中科院“九五”重大项目!长江流域农业可持续发展途径研究KZ951-A1-202-02;;国务院三峡建设委员会的资助
【CateGory Index】: S181
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