| 宁南山区退耕还林还草对土壤氮素组成及其转化酶活的影响 |
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| 引用本文： | 高涵,肖礼,牛丹,倪银霞,黄懿梅. 宁南山区退耕还林还草对土壤氮素组成及其转化酶活的影响[J]. 环境科学, 2019, 40(8): 3825-3832 |
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| 作者姓名： | 高涵 肖礼 牛丹 倪银霞 黄懿梅 |
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| 作者单位： | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100;西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100;中国矿业大学(北京)地球科学与测绘工程学院, 北京 100083 |
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| 基金项目： | 国家自然科学基金项目（41101254）；中国科学院对外合作重点项目（161461KYSB20170013） |
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| 摘 要： | 以宁夏南部山区柠条、山桃、苜蓿和长芒草这4种植被为研究对象,玉米(农地)为对照,测定土壤中7种氮素的含量及2种氮素转化相关酶的活性,通过冗余分析方法探究退耕还林还草对土壤氮素及其转化酶活的影响.结果表明:①与玉米地相比,长芒草地的颗粒有机氮,轻组分有机氮,微生物生物量氮和铵态氮分别增加35. 3%、83. 3%、64. 2%和110. 0%;苜蓿地的可溶性有机氮和铵态氮分别增加0. 7%和67. 5%;长芒草地的天冬酰胺酶和蛋白酶活性活性分别提高360%和144. 8%,说明退耕还草对氮素及其转化酶有一定促进作用;②山桃地的有机氮、轻组分有机氮、颗粒有机氮和可溶性有机氮分别比玉米地高3. 7%、133. 3%、70. 6%和28. 1%,柠条地的轻组分有机氮和山桃地的微生物生物量氮分别比玉米地高16. 7%和49. 6%,柠条地和山桃地的蛋白酶活性均高于玉米地,说明退耕还林对氮素及其转化酶同样有促进作用.③冗余分析(RDA)结果和环境因子解释率表明,土壤含水率,p H值和有机碳是影响宁南山区氮素分布与转化的关键因子.退耕还林还草改变了氮素相关转化酶的活性、对氮素组成有一定的促进作用,为黄土高原生态恢复和土壤质量管理提供了理论依据.
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| 关 键 词： | 冗余分析 退耕还林还草 氮组分 酶活性 宁南山区 |
| 收稿时间： | 2018-11-05 |
| 修稿时间： | 2019-03-08 |
Effects of Converting Farmland into Forest and Grassland on Soil Nitrogen Component and Conversion Enzyme Activity in the Mountainous Area of Southern Ningxia |
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| GAO Han,XIAO Li,NIU Dan,NI Yin-xia and HUANG Yi-mei. Effects of Converting Farmland into Forest and Grassland on Soil Nitrogen Component and Conversion Enzyme Activity in the Mountainous Area of Southern Ningxia[J]. Chinese Journal of Environmental Science, 2019, 40(8): 3825-3832 |
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| Authors: | GAO Han XIAO Li NIU Dan NI Yin-xia HUANG Yi-mei |
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| Affiliation: | Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China,Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China;College of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing 100083, China,Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China,Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China and Key Laboratory of Plant Nutrition and Agri-environment in Northwest China, Ministry of Agriculture, College of Natural Resource and Environment, Northwest A & F University, Yangling 712100, China |
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| Abstract: | |
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| Keywords: | redundancy analysis converting farmland into forest and grassland nitrogen components enzyme activities mountainous area of southern Ningxia |
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