沙化对玛曲高寒草甸土壤微生物数量及土壤酶活性的影响

发布时间：2018-04-30 16:20

本文选题：沙化 + 土壤微生物　；参考：《生态学报》2016年18期

【摘要】：对不同沙化程度高寒草甸土壤物理性质和土壤酶活性及微生物结构进行调查分析,结果表明:(1)随沙化程度的加剧,玛曲高寒草甸土壤粘粒成分、含水量、蔗糖酶活性、脲酶活性、中性磷酸酶活性以及过氧化氢酶活性均呈现出下降趋势,而土壤细砂粒成分和pH值逐渐增大,土壤粗砂粒、细菌数量、真菌数量、放线菌数量以及微生物总数量均出现了先增大后减小的趋势。(2)在发生沙化的高寒草甸土壤中,细菌占土壤微生物的主要组分,然后依次是放线菌和真菌;细菌百分比在中度沙化的样地土壤中达到最大值,放线菌和真菌百分比在轻度沙化的样地土壤中达到最大值。(3)在玛曲高寒草甸沙化过程中,驱使土壤微生物数量变化的主导因子是土壤孔隙度和含水量;驱使土壤酶活性变化的主导因子,在沙化初期是土壤含水量、颗粒组成、动植物和pH,在沙化发生后是土壤微生物、颗粒组成、含水量及动植物。
[Abstract]:The soil physical properties, soil enzyme activity and microbial structure of alpine meadow with different desertification degrees were investigated. The results showed that the soil clay, water content and sucrase activity in Maqu alpine meadow increased with the increase of desertification degree. Urease activity, neutral phosphatase activity and catalase activity all showed a downward trend, while the composition and pH value of fine sand increased gradually. The number of actinomycetes and the total number of microbes increased first and then decreased. 2) in the sandy alpine meadow soil, bacteria accounted for the main components of soil microorganisms, followed by actinomycetes and fungi. The percentage of bacteria reached the maximum in the moderately sandy sample soil, and the percentage of actinomycetes and fungi reached the maximum in the lightly sandy sample soil. (3) in Maqu alpine meadow, the percentage of bacteria reached the maximum in the sandy process of alpine meadow. The main factors driving the change of soil microbial quantity are soil porosity and water content, and the main factors driving the change of soil enzyme activity are soil moisture content, particle composition, animal, plant and pH value at the beginning of desertification, and soil microorganism after desertification occurs. Particle composition, water content, and plants and animals.
【作者单位】：兰州大学草地农业科技学院;甘肃省治沙研究所;甘肃河西走廊森林生态系统国家定位观测研究站;甘肃民勤荒漠草地生态系统国家野外科学观测研究站;民勤县林业局;
【基金】：国家自然科学基金项目(31160111,31360203) 甘肃省自然科学研究基金计划项目(1308RJZA267,1308RJYA081)
【分类号】：S812.2

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