| 盐碱区不同开发年限水田温室气体排放规律及影响因素 |
| 摘要点击 2264 全文点击 1152 投稿时间：2014-03-25 修订日期：2014-07-21 |
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| 中文关键词 盐碱水田 CH4 N2O 土壤pH SOC |
| 英文关键词 saline-alkali paddy field CH4 N2O soil pH SOC |
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| 中文摘要 |
| 以吉林省前郭盐碱水田区为研究对象，采用野外采样和小区试验相结合的方法，监测水稻生长期土壤温室气体（CH4和N2O）排放、土壤pH和土壤有机碳（SOC）变化，分析水田温室气体排放规律及其影响因素. 结果表明，水田N2O排放季节变化特征明显并呈现3个峰值，肥料的施入提供了更多的反应底物，对水田N2O的排放量影响显著. 在淹水条件下，N2O的主要来源于反硝化过程，而排水后，硝化作用则占据了主导地位. CH4排放呈现单峰，在水稻生长旺盛的分蘖期，稻田较深水层以还原环境为主，为产生CH4的微生物提供了适宜的条件，进而导致CH4排放呈高峰值；土壤 pH对 N2O和CH4排放的影响不明显，但土壤SOC含量与CH4的排放规律呈现显著正相关. |
| 英文摘要 |
| With the method of combining field sampling and plot test, we took saline-alkali paddy field of Qianguo county, Jilin province as an investigation object. According to the nature of soil in the area, we monitored CH4 and N2O which released from soil during rice growth period and tested the soil pH and soil organic carbon to analyze the law and reasons of greenhouse gas emission in the paddy fields. The results showed that N2O emission from paddy fields presented three peaks with distinct seasonal patterns. Application of fertilizer provided additional reactive substrate, which affected N2O emission significantly. Under flooding conditions, the main source of N2O is a denitrification process, while after drainage, nitrification was the predominance. CH4 emission showed a single peak at rice tillering stage when rice grew vigorously. That deoxidation condition dominated in the deep water layer in the paddy fields provided suitable conditions for CH4 producing microorganisms, which result in the emergence of CH4 emission peak. The pH doesn't have an obvious influence on CH4 and N2O, while SOC content in soil and pattern of CH4 emission showed a significantly positive correlation. |
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