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| Effects of water and nitrogen management on soil carbon sequestration and soybean yields in wheat-soybean cropping fields |
| Received:October 13, 2015 |
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| KeyWord:water and nitrogen management;soybean-wheat cropping;soil organic carbon;carbon pool management index |
| Author Name | Affiliation | E-mail | | LI Ya-jie | Xinjiang Agricultural University, Agricultural College, Urumqi 830052, China | | | XU Wen-xiu | Xinjiang Agricultural University, Agricultural College, Urumqi 830052, China | xjxwx@sina.com | | SU Li-li | Xinjiang Agricultural University, Agricultural College, Urumqi 830052, China | | | WANG Na | Center of Spreading Agricultural Techniques of Yining County, Yili 835100, China | | | ZHANG Na | Xinjiang Agricultural University, Agricultural College, Urumqi 830052, China | | | WANG Ting | Center of Spreading Agricultural Techniques of Yining County, Yili 835100, China | | | HAO Wei-wei | Xinjiang Agricultural University, Agricultural College, Urumqi 830052, China | |
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| Abstract: |
| A field experiment was conducted to study the effects of different water and nitrogen management on soil organic carbon, carbon pool management index, and soybean yields in the wheat-soybean fields in Yining County from 2012 to 2014. Experimental design was water and nitrogen two factor split-plot design, with 4 irrigation levels, namely 3000(W1), 3600(W2), 4200(W3), and 4800(W4) m3·hm-2, and 3 nitrogen levels:0(N0), 150(N1), and 300(N2)kg·hm-2. Results showed that content of soil organic carbon and non-active organic carbon decreased with increasing soil depth. As nitrogen rates or irrigation water amount increased, soil organic carbon, organic carbon active and non-active organic carbon content showed "initial increase and then decrease" pattern, with the highest found at W3N1 combination treatment. Soybean yield was positively correlated with soil organic carbon, active organic carbon and carbon pool management index, with the greatest correlation coefficient found in active organic carbon. Our results suggest that the W3N1 combination would not only enhance soil organic carbon sequestration and reduce emissions, but could also improve soil fertility and increase soybean production. |
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