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草业科学  2014 

陇东典型草原不同坡向土壤呼吸对模拟降雨的短期响应

DOI: 10.11829\j.issn.1001-0629.2013-0729, PP. 1820-1824

Keywords: 土壤呼吸速率,土壤水分,典型草原,陇东黄土高原

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Abstract:

?降雨是影响草地土壤呼吸的关键环境之一,为研究典型草原土壤呼吸对降雨的短期响应,2012年在陇东黄土高原开展模拟降雨试验。结果表明,降雨对阳坡草地土壤温度的短期影响明显,对阴坡草地温度无影响。15和30mm降雨后,阳坡草地土壤呼吸速率急剧升高,分别是无降雨样地的9.0倍和10.3倍,且30mm降雨土壤呼吸速率显著高于15mm降雨的草地(P<0.05);阴坡草地土壤呼吸速率则分别是无降雨样地的6.2倍和9.0倍。降雨处理5h后草地的土壤呼吸速率与无降雨样地无差异。降雨发生后,草地土壤CO2日排放量为无降雨草地的2~3倍。因此,在估测土壤CO2排放量时应考虑降水对土壤呼吸的激发作用,有必要依据降雨数据对结果进行校正。

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