青藏高原不同退化梯度草地土壤酶活性特征  

Characteristics of soil enzyme activities in different degraded gradient grasslands on the Tibetan Plateau

作　　者：李邵宇 孙建[2] 王毅[2,3] 秦小静 叶冲冲 LI Shaoyu;SUN Jian;WANG Yi;QIN Xiaojing;YE Chongchong(College of Grassland,Resource and Environment,Inner Mongolia Agricultural University,Hohhot 010011,Inner Mongolia,China;Institute of Geographic Science and Nature Resources Research,Chinese Academy of Science,Beijing 100101,China;College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,Sichuan,China;Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Civil Engineering and Architecture,Southwest Petroleum University,Chengdu 610500,Sichuan,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,内蒙古呼和浩特010011 [2]中国科学院地理科学与资源研究所,北京100101 [3]成都理工大学地球科学学院,四川成都610059 [4]河南理工大学测绘与国土信息工程学院,河南焦作454150 [5]西南石油大学土木工程与建筑学院,四川成都610500

出　　处：《草业科学》2020年第12期2389-2402,共14页Pratacultural Science

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0405-05)。

摘　　要：土壤酶是土壤生态系统物质循环和能量流动的重要参与者,也是草地生态系统代谢的重要动力之一,其活性大小对土壤养分储量和生化反应过程有明显指示作用。本研究以青藏高原高寒草甸和高寒草原为研究对象,通过对土壤理化性质和土壤酶化学计量特征进行分析,探究不同退化梯度下土壤酶特征及作用机理。结果表明:1)随着退化程度加剧,两种草地类型土壤全氮、全碳、全磷、有机碳、紧实度、含水量、N-乙酰-β-D-葡萄糖苷酶、亮氨酸氨基肽酶和β-葡萄糖苷酶均呈降低趋势,土壤温度和pH呈增加趋势;2)高寒草甸土壤pH与β-葡萄糖苷酶活性和木质素过氧化物酶呈负相关关系,有机碳、全碳与β-葡萄糖苷酶、木质素过氧化酶呈正相关关系;高寒草原含水量和紧实度与亮氨酸氨基肽酶、碱性磷酸酶、脲酶和N-乙酰-β-D-葡萄糖苷酶呈正相关关系。本研究为探索青藏高原不同草地类型退化过程中土壤理化性质和酶活性变化机理以及草地生态系统修复提供了理论依据。Soil enzymes are important in nutrient cycling,material circulation,energy flow,and metabolism in the ecosystem.We determined the soil physical and chemical properties,and enzyme stoichiometry,and explored the driving mechanism along a degraded gradient on Tibetan Plateau alpine meadow and steppe.The results showed that:1)Soil total nitrogen,total carbon,total phosphorus,organic carbon,compactness,moisture content,β-1,4-N-acetylglucosaminidase,leucine aminopeptidase,andβ-1,4-glucosidase exhibited a decreasing trend,while soil temperature and pH increased with the aggravation of degradation in both alpine meadow and steppe;2)Pearson correlation analysis showed that pH was significantly negatively correlated withβ-1,4-glucosidase activity and lignin peroxidase,while organic carbon and total carbon were positively correlated withβ-1,4-glucosidase and lignin peroxidase in alpine meadow.The moisture content and compactness in alpine steppe were positively correlated with leucine aminopeptidase,alkaline phosphatase,urease,andβ-1,4-N-acetylglucosaminidase.The study provides a theoretical basis for exploring the variation mechanism of soil physical and chemical properties and enzyme activity under different degradation gradients,and grassland ecosystem restoration in Tibetan Plateau.

关 键 词：土壤酶 退化梯度 化学计量 高寒草原 高寒草甸 

分 类 号：S812.2[农业科学—草业科学]