稻-鸭复合系统中灌水深度对甲烷排放的影响
Journal of Hunan Agricultural University(Natural Sciences)(2006)
Abstract
以稻田养鸭和稻田蓄水2项经典农作技术为背景,研究了稻-鸭复合系统中不同灌水深度对甲烷排放的影响以及深水灌溉下土壤氧化还原特性对甲烷排放的影响.结果表明,灌水20,10 cm与灌水5,2 cm处理之间甲烷排放通量差异显著;4个处理全生育期CH4排放总量分别为6.28,6.36,7.23,7.30 g/m2,灌水处理期间CH4排放量分别为1.19,1.24,2.31,2.37 g/m2,灌水20 cm的CH4排放量分别是其他处理的95.9%,51.5%,50.2%.深灌导致土壤氧化还原电位略降低,灌水20 cm土壤氧化还原电位比2 cm处理低8.2 mV.相关分析表明,甲烷排放通量与土壤氧化还原电位相关性不显著,与还原物质总量、活性还原物质总量呈正相关.
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Key words
methane emission,irrigation depths,rice-duck ecosystem
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