| 青藏高原退化高寒草地土壤氮矿化特征以及影响因素研究 |
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| 引用本文： | 王学霞,董世魁,高清竹,张勇,胡国铮,罗文蓉.青藏高原退化高寒草地土壤氮矿化特征以及影响因素研究[J].草业学报,2018,27(6):1-9. |
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| 作者姓名： | 王学霞 董世魁 高清竹 张勇 胡国铮 罗文蓉 |
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| 作者单位： | 中国农业科学院农业环境与可持续发展研究所,北京100081;北京师范大学环境学院,北京100875;北京师范大学环境学院,北京,100875;中国农业科学院农业环境与可持续发展研究所,北京,100081;西南林业大学湿地学院,云南昆明,650224 |
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| 基金项目： | 博士后科学基金(157148)，国家自然科学基金(青年)(31600366)，国家重点研发计划课题(2016YFC0502003) |
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| 摘 要： | 为了明确青藏高原退化高寒草地土壤氮矿化特点以及影响因素,以高寒草甸和高寒草原为研究对象,运用原位培养法对健康与退化条件下2类型草地中土壤硝化速率、氨化速率以及氮素转化微生物、植物和土壤等因子进行了研究。结果表明:1)草地退化显著降低了高寒草甸和草原土壤净硝化速率和净氨化速率;2)草地退化降低了2类高寒草地土壤硝化细菌和氨化细菌数量,降低了土壤蛋白酶、脲酶活性;3)草地退化显著降低了NH4-N和NO3-N含量,降低了微生物生物量氮含量。相关分析表明,高寒草地中土壤硝化速率和氨化速率与土壤硝化细菌和氨化细菌的数量以及蛋白酶和脲酶密切相关。植物生物量、土壤含水量、有机碳、全氮含量通过影响微生物数量、微生物生物量及酶活性而成为影响土壤氮素转化的主要因素。因此,草地退化通过降低高寒草地硝化细菌和氨化细菌、土壤酶活性而降低土壤氮素转化速率和土壤有效氮的供给。
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| 关 键 词： | 草地退化 硝化速率 氨化速率 氮素转化微生物 高寒草地 |
| 收稿时间： | 2017-06-26 |
| 修稿时间： | 2017-11-02 |
The rate of soil nitrogen transformation decreased by the degradation of alpine grasslands in the Qinghai Tibet Plateau |
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| WANG Xue-xia,DONG Shi-kui,GAO Qing-zhu,ZHANG Yong,HU Guo-zheng,LUO Wen-rong.The rate of soil nitrogen transformation decreased by the degradation of alpine grasslands in the Qinghai Tibet Plateau[J].Acta Prataculturae Sinica,2018,27(6):1-9. |
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| Authors: | WANG Xue-xia DONG Shi-kui GAO Qing-zhu ZHANG Yong HU Guo-zheng LUO Wen-rong |
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| Institution: | 1.Agricultural Environment and Sustainable Development Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2.School of Environment, Beijing Normal University, Beijing 100875, China; 3.School of Wetlands, Southwest Forestry University, Kunming 650224, China |
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| Abstract: | Alpine meadow and alpine steppe were studied to explore the mechanisms of degradation in soil nitrogen transformation and the key factors that affect soil N transformation in grasslands of the Qinghai Tibet Plateau. The net nitrification rate and net ammonification rate, as well as the microbial aspects of nitrogen transformation, plant and soil factors, were investigated using the method of in situ incubation. The results showed that: 1) The net nitrification and ammonification rates were significantly reduced by degradation in alpine grassland ecosystems; 2) The number of nitrifiers and ammonifiers in the soil, soil urease and protease activities decreased in the degraded meadows and steppe. 3) NH4-N and NO3-N contents were significantly reduced and microbial biomass nitrogen (MBN) also decreased. Soil nitrification and ammonification rates were closely related to the number of ammonifiers and nitrifiers, microbial biomass, and the extent of protease and urease in soils. Plant biomass, soil water, organic carbon and total nitrogen content were the main factors affecting soil N transformation by influencing the number of microbes, microbial biomass and enzyme activities. In conclusion, soil N transformation rates and the supply of available nitrogen in soils declined in degraded alpine grassland due to reductions in nitrogen transformation microbes and soil enzyme activities. |
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| Keywords: | grassland degradation nitrification rate ammonification rate nitrogen transformation microbes alpine grassland |
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