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| DOI：10.13522/j.cnki.ggps.2022370 |
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| Ammonia Volatilization from Irrigated Paddy Fields in Southern China Plains and Its Determinants |
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YANG Zirong, ZOU Zhike, LUO Wenbing, XIAO Xin,
HUANG Shaozhe, PAN Hongzhong, LI Yalong
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1. Yangtze University, Wuhan 430100, China; 2. Yangtze River Scientific Research Institute, Wuhan 430100, China
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| Abstract: |
| 【Objective】Ammonia volatilization is a pathway of nitrogen cycling in soil. It is mediated by various biotic and abiotic processes. The objective of this paper is to study its variation and determinants in irrigated midseason rice fields in southern China plains.【Method】The field experiment was conducted in an irrigation experimental station in Jiangxi province. It consisted of two irrigation methods: intermittent irrigation (W1) and traditional flooding irrigation (W0), and three nitrogen fertilizations: 0 (N0), 135 kg/hm2 (N1), 180 kg/hm2 (N2). We measured the ammonia volatilization from each treatment and analyzed its correlation with different meteorological factors.【Result】When irrigation was the same, increasing nitrogen fertilization increased ammonia volatilization, while when nitrogen fertilization was the same, ammonia volatilization was less in flooded irrigation than in intermittent irrigation. Ammonia volatilization occurred mainly in the tillering, jointing and heading stages, the total ammonia volatilization during which accounted for more than half of the total ammonia volatilization in the whole growth season. Among the meteorological factors, sunshine duration positively impacted ammonia volatilization the most, followed by wind speed and evaporation but their influence was negative.【Conclusion】Compared with traditional flooding irrigation, intermittent irrigation increased ammonia volatilization, especially in early and middle stages of the growth season. Ammonia volatilization was positively correlated with sunshine duration and negatively with wind speed and evaporation. |
| Key words: ammonia volatilization; water and fertilizer management; meteorological factor; plain irrigation area; significance |
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