黄土高原不同植被带土壤团聚体有机碳和酶活性的粒径分布特征  

Characteristics of soil organic carbon and enzyme activities in soil aggregates under different vegetation zones on the Loess Plateau

作　　者：李鑫[1,2] 马瑞萍[1,3] 安韶山[1,2] 曾全超 李娅芸 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [3]西藏自治区农牧科学院农业资源与环境研究所,拉萨850032 [4]中国科学院教育部水土保持与生态环境研究中心,陕西杨凌712100

出　　处：《应用生态学报》2015年第8期2282-2290,共9页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41171226);国家自然科学基金重点项目(41030532);"新世纪优秀人才支持计划"项目(NCET-12-0479);西北农林科技大学"优秀人才科研专项"计划项目(QN2011049)资助

摘　　要：为探究土壤中各粒级团聚体不同形态有机碳和酶活性的分布特征,以黄土高原延河流域森林带、森林草原带、草原带土壤为对象,研究了不同粒级团聚体总有机碳、易氧化碳和腐殖质碳含量,以及纤维素酶、β-D葡糖苷酶、过氧化物酶、蔗糖酶和脲酶活性,分析了土壤团聚体有机碳及其组分与酶活性之间的相关关系.结果表明：3种植被带土壤团聚体有机碳及其组分含量表现为森林带〉草原带〉森林草原带,3种形态有机碳含量在0.25-2 mm粒径均最高;不同植被带土壤团聚体有机碳及其组分含量和酶活性在0-10 cm土层大于10-20cm土层;3种植被带纤维素酶、β-D葡糖苷酶、蔗糖酶和脲酶活性表现为森林带〉草原带〉森林草原带,过氧化物酶活性表现为森林带〉森林草原带〉草原带;3种植被带土壤中各种酶活性随着粒径的减小呈递增趋势.土壤纤维素酶、过氧化物酶、蔗糖酶和脲酶活性与团聚体各种形态碳含量均呈显著正相关.In order to explore the distribution characteristics of organic carbon of different forms and the active enzymes in soil aggregates with different particle sizes,soil samples were chosen from forest zone,forest-grass zone and grass zone in the Yanhe watershed of Loess Plateau to study the content of organic carbon,easily oxidized carbon,and humus carbon,and the activities of cellulase,β-D-glucosidase,sucrose,urease and peroxidase,as well as the relations between the soil aggregates carbon and its components with the active soil enzymes were also analyzed. It was showed that the content of organic carbon and its components were in order of forest zone grass zone forestgrass zone,and the contents of three forms of organic carbon were the highest in the diameter group of 0. 25- 2 mm. The content of organic carbon and its components,as well as the activities of soil enzymes were higher in the soil layer of 0- 10 cm than those in the 10- 20 cm soil layer of different vegetation zones. The activities of cellulase,β-D-glucosidase,sucrose and urease were in order of forest zone grass zone forest-grass zone. The peroxidase activity was in order of forest zone forest-grass zone grass zone. The activities of various soil enzymes increased with the decreasing soil particle diameter in the three vegetation zones. The activities of cellulose,peroxidase,sucrose and urease had significant positive correlations with the contents of various forms of organic carbon in the soil aggregates.

关 键 词：黄土高原 土壤团聚体 土壤有机碳 酶活性 植被带 

分 类 号：S154.4[农业科学—土壤学]