冻融交替对黑土氮素转化及酶活性的影响

被引：20

作者：

李源 ^{[1
]}

祝惠 ^{[2
]}

袁星 ^{[1
]}

机构：

[1] 东北师范大学环境学院

[2] 中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室

来源：

土壤学报 | 2014年 / 51卷 / 05期

关键词：

黑土; 冻融交替; 铵态氮; 硝态氮; 转化速率; 土壤酶;

D O I：

暂无

中图分类号：

S153.6 [土壤成分]; S154.2 [土壤生物化学];

学科分类号：

0903 ; 090301 ; 071012 ; 0713 ;

摘要：

以黑土为试验材料,通过室内培养实验,研究了不同冻融循环(-25—5℃、-10—5℃)对黑土氮素转化速率和土壤酶活性的影响。结果表明:随着冻融频次的增加,铵态氮含量和硝态氮含量均逐渐增加。除了中强度冻融(-10—5℃)的土壤铵态氮在培养第1周期内的含量最低外,剩余培养周期内,铵态氮含量均表现为中强度冻融(-10—5℃)>高强度冻融(-25—5℃)>对照组(5℃);硝态氮含量对不同冻融温度的响应差异显著。与对照组相比较,冻融循环整体上降低了土壤的矿化速率和硝化速率,但实验末期有促进硝化的趋势,不同强度冻融对矿化速率和硝化速率影响显著。受土壤温度和冻融交替的影响,土壤的脲酶活性和转化酶活性均低于对照组,且脲酶活性和转化酶活性均表现为中强度冻融>高强度冻融(第1周期除外)。综上,冻融作用对黑土的供氮能力和土壤酶活性具有重要影响。

引用

页码：1103 / 1109

页数：7

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