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《Scientia Agricultura Sinica》 2005-09
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Intercropping Advantage and Contribution of Above-Ground and Below-Ground Interactions in the Barley-Maize Intercropping

LIU Guang-cai1,2,LI Long2,HUANG Gao-bao1,SUN Jian-hao3,GUO Tian-wen3,ZHANG Fu-suo2(1College of Agronomy,Gansu Agricultural University,Lanzhou 730070;2Key Laboratory of Plant and Soil Interactions,Ministry of Education,College of Resources and Environmental Sciences,China Agricultural University,Beijing 100094;3Soil and Fertilizer Institute,Gansu Academy of Agricultural Sciences,Lanzhou 730070 )  
A microplot experiment and a root barrier technique were employed to investigate the intercropping advantage and the relative contribution of above-and below-ground interactions to the yield and nutrient uptaking in the barley-maize intercropping system with or without plastic sheet mulching.The results showed that the land equivalent ratios (LERs) of both grain yield and biomass were around 1 (average 1.06) for the intercropping of barley and maize without plastic sheet mulching,showing a yield disadvantage of the intercropping.In contrast,LERs with plastic sheet mulching were 1.32 for grain yield and 1.30 for biomass,indicating a significant yield advantage of the intercropping.There was no significant advantage of nutrient uptaking in the intercropping of barley and maize without plastic sheet mulching,whereas there was significant advantage of nutrient uptaking in the intercropping with plastic sheet mulching.The contribution of above-ground and below-ground interactions to the intercropping advantage of grain yield were 80% and 20%,respectively,for the intercropping with plastic sheet mulching.Similar results were observed for above-ground biomass.The contribution of above-ground and below-ground interactions to the increase of nutrient uptaking were 50% and 50% for nitrogen,60% and 40% for phosphorus,45% and 55% for potassium respectively,when intercropped maize was mulched with plastic sheet.
【Fund】: 国家重大基础研究发展项目(G1999011707);; 国家自然科学基金项目(30070450)资助
【CateGory Index】: S512.3;S513
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