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Nitrous oxide emissions affected by tillage measures in winter wheat under a rice-wheat rotation system

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Author:: No author available

Journal Title:: Acta Ecologica Sinica

Issue:: 19

DOI:: 10.5846/stxb201109011283

Key Word:: 耕作;冬小麦;N2O排放;稻麦轮作

Abstract： 2008-2011年,采用静态箱-气相色谱法对长江下游稻麦轮作系统冬小麦农田N2O排放进行了为期3a的田间原位观测,研究不同耕作措施(免耕、旋耕和翻耕)对冬小麦生长季N2O排放的影响.结果表明:不同耕作措施下冬小麦农田N2O排放高峰出现在施用基肥后的1个月内以及施用孕穗肥后的4月中旬至小麦成熟期,其余时间N2O排放通量均较小.年度和耕作措施对冬小麦农田N2O季节排放总量均有极显著影响(P＜0.01),不同处理N2O季节排放总量表现为免耕＞翻耕＞旋耕,2008-2011年3年平均分别为2.50kg/hm2、2.05kg/hm2和1.66kg/hm2,免耕比翻耕增加N2O排放22.0％(P＜0.05),旋耕比翻耕减排19.0％(P＜0.05).冬小麦生长期内施用孕穗肥后1个月内N2O排放通量与农田土壤充水孔隙率(WFPS)及10cm地温呈显著(P＜0.05)或极显著(P＜0.01)正相关,2009-2010年施用基肥后1个月内N2O排放通量与WFPS呈显著负相关(P＜0.05).结果说明旋耕是减少长江下游稻麦轮作系统冬小麦农田N2O排放的最佳耕作措施.

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