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草业科学  2014 

温度和湿度对内蒙古草原土壤氮矿化的影响

DOI: 10.11829\j.issn.1001-0629.2013-0721, PP. 349-354

Keywords: 室内培养,氮矿化量,净氮矿化速率,土壤温度,土壤水分

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Abstract:

?本研究对内蒙古克氏针茅(Stipakrylovii)草原土样进行不同温湿度梯度下的室内培养试验,温度梯度分别为9、14、22、30和40℃,湿度梯度为13%、26%、39%、52%和66%体积含水量(VolumetricWaterContent,VWC)。研究结果表明,土壤氮矿化量和净氮矿化速率与培养温度均极显著相关(P<0.01);不同培养温度下,土壤氮矿化量差异不显著(P>0.05);培养前期和中期不同温度下土壤净氮矿化速率差异显著(P<0.05)。土壤氮矿化量和净氮矿化速率均值与湿度呈二项式关系,52%~66%VWC内氮矿化量和矿化速率显著下降(P<0.01);除培养后期外,其他时期不同湿度条件间,净矿化速率差异均显著(P<0.05)。温度和湿度对土壤氮矿化作用存在显著互作(P<0.01),培养后期环境胁迫引起氮固持作用增强,导致净氮矿化速率对温湿度的交互作用无显著响应。

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