高寒草地不同退化程度下土壤微生物及土壤酶活性变化特征
发布时间：2018-08-07 12:33
【摘要】：为探讨不同退化程度对高寒草地土壤微生物及土壤酶活性的影响,以青藏高原东北缘祁连山3种不同退化程度(轻度退化、中度退化、重度退化)高寒草地为研究对象,测定和分析土壤3大类微生物(细菌、真菌、放线菌)和氮素生理群(氨化细菌、好气性固氮菌、嫌气固氮菌、硝化细菌、反硝化细菌)数量、微生物量(碳、氮)及土壤酶活性(蔗糖酶、脲酶、磷酸酶、过氧化氢酶)变化特征。结果表明:(1)相同土层不同退化程度,土壤3大类微生物数量、氮素生理群、微生物量以及土壤酶活性随退化程度的加重总体呈减小的趋势,重度退化程度下各指标含量最小,中等退化程度可增加10—20cm土壤放线菌、氨化细菌及反硝化细菌数量和20—30cm土壤细菌、真菌、放线菌、好气性固氮菌、反硝化细菌数量;(2)不同土层相同退化程度,土壤3大类微生物数量、氮素生理群、微生物量以及土壤酶活性随土层深度的加深均逐渐减小。研究结果对评价草地退化程度提供了新思路,同时为高寒草地的恢复和重建提供了重要的理论依据。
[Abstract]:In order to study the effect of different degradation degree on soil microorganism and soil enzyme activity of alpine grassland, three kinds of degraded alpine grassland (mild degradation, moderate degradation and severe degradation) were studied in Qilian Mountains, northeast margin of Qinghai-Tibet Plateau. To measure and analyze the number and biomass of three kinds of soil microbes (bacteria, fungi, actinomycetes) and nitrogen physiological groups (ammoniated bacteria, aerobic nitrogen-fixing bacteria, nitrifying bacteria, denitrifying bacteria), and microbial biomass (carbon, nitrogen fixing bacteria, denitrifying bacteria). Changes of soil enzyme activity (sucrase, urease, phosphatase, catalase). The results showed that: (1) in the same soil layer, the number of microorganism, the physiological group of nitrogen, the microbial biomass and the activity of soil enzyme decreased with the increase of degradation degree, and the content of each index was the lowest in the severe degree of degradation. The number of soil actinomycetes, ammoniated bacteria and denitrifying bacteria in 10-20cm soil and the number of bacteria in 20-30cm soil, fungi, actinomycetes, nitrogen-fixing bacteria and denitrifying bacteria were increased by moderate degradation degree. (2) the same degree of degradation was found in different soil layers. The number of three kinds of microorganism, the physiological group of nitrogen, microbial biomass and soil enzyme activity decreased with the deepening of soil depth. The results provide a new idea for the evaluation of grassland degradation and provide an important theoretical basis for the restoration and reconstruction of alpine grassland.
【作者单位】： 甘肃农业大学草业学院草业生态系统教育部重点实验室中—美草地畜牧业可持续发展研究中心;
【基金】：国家自然基金项目(31660688) 农业部现代牧草产业技术体系项目(CARS-35)
【分类号】：S812.2
本文编号：2170035
[Abstract]:In order to study the effect of different degradation degree on soil microorganism and soil enzyme activity of alpine grassland, three kinds of degraded alpine grassland (mild degradation, moderate degradation and severe degradation) were studied in Qilian Mountains, northeast margin of Qinghai-Tibet Plateau. To measure and analyze the number and biomass of three kinds of soil microbes (bacteria, fungi, actinomycetes) and nitrogen physiological groups (ammoniated bacteria, aerobic nitrogen-fixing bacteria, nitrifying bacteria, denitrifying bacteria), and microbial biomass (carbon, nitrogen fixing bacteria, denitrifying bacteria). Changes of soil enzyme activity (sucrase, urease, phosphatase, catalase). The results showed that: (1) in the same soil layer, the number of microorganism, the physiological group of nitrogen, the microbial biomass and the activity of soil enzyme decreased with the increase of degradation degree, and the content of each index was the lowest in the severe degree of degradation. The number of soil actinomycetes, ammoniated bacteria and denitrifying bacteria in 10-20cm soil and the number of bacteria in 20-30cm soil, fungi, actinomycetes, nitrogen-fixing bacteria and denitrifying bacteria were increased by moderate degradation degree. (2) the same degree of degradation was found in different soil layers. The number of three kinds of microorganism, the physiological group of nitrogen, microbial biomass and soil enzyme activity decreased with the deepening of soil depth. The results provide a new idea for the evaluation of grassland degradation and provide an important theoretical basis for the restoration and reconstruction of alpine grassland.
【作者单位】： 甘肃农业大学草业学院草业生态系统教育部重点实验室中—美草地畜牧业可持续发展研究中心;
【基金】：国家自然基金项目(31660688) 农业部现代牧草产业技术体系项目(CARS-35)
【分类号】：S812.2
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