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大气CO_2浓度升高对稻田中小麦秸秆分解的影响

Keywords: 大气CO2浓度升高,秸秆分解,氮肥处理,脱氢酶活性

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Abstract:

利用在江苏无锡运行的农田开放式空气CO2浓度升高(FACE)系统平台,研究了FACE条件对稻田中小麦秸秆分解的影响。结果表明,大气CO2浓度升高对秸秆的分解与土壤中氮肥的施用有关。在常规氮肥施用处理中大气CO2浓度升高显著降低小麦秸秆分解速率,而在高氮施肥处理中FACE对秸秆分解没有显著影响;在常氮施肥处理中,大气CO2浓度升高显著降低秸秆中含碳物质的分解,而在高氮施肥处理中,大气CO2浓度升高的影响不显著;不论是在高氮还是常氮施肥处理中,大气CO2浓度升高对秸秆中含氮物质的分解没有显著影响;大气CO2浓度升高有增加土壤中脱氢酶活性的趋势。

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