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不同水稻土水稻生长季施用秸秆对后季麦田N2O 排放的影响

DOI: 10.7685/j.issn.1000-2030.2004.01.009, PP. 36-40

Keywords: N2O排放,秸秆,土壤特性,水稻生长季,小麦生长季,盆栽试验

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Abstract:

采用苏南、苏中和苏北的5种类型水稻土(共10个土样)进行室外盆栽试验,研究稻田土壤秸秆施用对后季麦田N2O排放的影响。试验组土壤施小麦秸秆(每盆10g)和化肥,对照组仅施化肥。结果表明在相同的气候及基本相同的水分含量条件下,有6个(江宁A1、宜兴B1和B3、宝应C3、仪征D3、六合E2)土样的N2O排放量较对照增加,增加量为243~713μg?m-2?h-1;宝应(C5)和仪征(D2)土样N2O排放量较对照减少112和793μg?m-2?h-1;而江宁(A3)和六合(E4)的增加量不明显。单相关分析表明,影响对照N2O排放的主要土壤因子是有机碳及全氮含量,相关系数为-0693和-0636;土壤有效态铁含量是影响处理组N2O排放的关键土壤参数,与N2O排放呈显著正相关,相关系数为0635。

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