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Wang G.-L.,China Agricultural University | Wang G.-L.,Institute of Agricultural Science of Lixiahe District | Cui Z.-L.,China Agricultural University | Chen X.-P.,China Agricultural University | And 3 more authors.
Chinese Journal of Applied Ecology | Year: 2015

Based on the literature data, the N2O emission, N leaching, N runoff and NH3 volatilization were compared from different rice production regions and their effective factors were evaluated. The results showed that N2O emission, N leaching and N runoff in single rice in Yangtze River basin were higher than in other rice production regions, with N loss of 1.89, 6.4 and 10.4 kg N·hm-2, and N loss rate of 0.8%, 3.8% and 5.3%, respectively. The high N2O emission, N leaching and N runoff in these regions might be attributed to high-rate N application and dry-wet alternation. The NH3 volatilization was the highest in late rice in southern China, with N loss of 54.9 kg N·hm-2 and N loss rate of 35.2% due to higher temperature at late rice growing stage. In the field, the practice often decreased one reactive N loss but increased another one, indicating that intergated practical management is necessary to reduce reactive N loss. Reactive N loss often increase with increasing grian yield, which is associed with the high-rate N application. The N2O emission, N leaching and N runoff decreased with increasing the partial factor productivity of applied N (PFP). Therefore, reducing N losses per unit of yield is necessary for integrating higher yield with minimum environmental pollution. ©, 2015, Editorial Board of Chinese Journal of Applied Ecology. All right reserved. Source

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