刘颖川,杨凯,叶哲隆,刘子元,李宗仁,王金贵

• 1:青海大学农牧学院
• 2:省部共建三江源生态与高原农牧业国家重点实验室

摘要(Abstract)：

本研究通过春玉米田间地膜覆盖试验,结合室内有机碳矿化速率培养实验,采用不同温度(10、15、20、25和30℃)进行室内培养,研究了青海东部地区无膜和覆膜两种栽培措施下土壤有机碳矿化对温度变化的响应规律。结果表明:在设定的温度范围内,无膜和覆膜处理条件下各土层土壤有机碳矿化速率均随着温度的升高呈指数增加,而随着土层深度的增加而减小;覆膜处理各土层土壤有机碳矿化速率、CO_2释放量和分配比例均大于无膜处理;各土层土壤有机碳矿化速率温度敏感性(Q_(10))存在一定程度的变异,其中无膜处理Q_(10)在1.564～1.817之间,覆膜处理Q_(10)在1.465～1.790之间;土壤有机碳矿化速率随着土壤有机碳含量的增加而增大,但随着土壤全氮含量的增加土壤C/N比逐渐减小,土壤有机碳矿化速率也逐渐减小,由此推断土壤中氮素含量的增加可能会对土壤有机碳矿化速率产生抑制效应。

关键词(KeyWords)： 有机碳;矿化;土壤;地膜覆盖;温度变化

Abstract:

Keywords:

基金项目(Foundation): 青海省自然科学基金项目(2018-ZJ-724);; 青海省重大科技专项项目(2019-NK-A11)资助

作者(Author): 刘颖川,杨凯,叶哲隆,刘子元,李宗仁,王金贵

DOI: 10.13448/j.cnki.jalre.2020.311

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