放牧对青藏高原东缘高寒草甸土壤微生物特征的影响
Effect of grazing intensity on soil microbial characteristics of an alpine meadow on the Tibetan plateau
查看参考文献33篇
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文摘
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通过对青藏高原高寒草甸(甘肃省玛曲县)四个放牧梯度下土壤微生物特征的比较,分析了该类草甸土壤微生物特征对不同放牧强度的响应.结果显示:与其他处理相比,中牧处理下的土壤有较高的微生物量及微生物熵,这表明在研究区域,适度的放牧可以增加土壤有效性碳、氮库;微生物代谢熵(qCO_2)在禁牧、轻牧和中牧处理间无显著差异,而重牧处理下的qCO_2明显高于其他处理的,说明高频度的放牧增强了土壤微生物的代谢活性;不同放牧处理下的W(C_(mic))/W(N_(mic))不存在显著差异,说明放牧强度对微生物群落结构不存在显著影响,在研究区域内细菌在微生物群落中占优势 |
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其他语种文摘
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A comparative study on the soil microbial characteristics with differerit grazing intensities was conducted in an alpine meadow on the Tibetan Plateau (in Maqu county,Gansu province). The results showed that moderate grazing markedly stimulated the accumulation and immobilization of C and N in microbes compared with the other treatments,thus demonstrating that proper grazing promoted the enrichment of the available soil C and N pool in the study region. No significant difference was found between non-grazm g,light grazing and moderate grazing for qCO_2,but the same variable in heavy-grazing was obviously higher than that under the other treatments,which suggested that the enhancement of grazing intensity increased the metabolic activity of the microbes. There was no obvious difference between the f'our treatments for W(C_(mic))/W(N_(mic)),which implied that grazing intensity had no marked effect on microbial community structure. Meanwhile,the bacteria was dominant in the microbial community in the study region |
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来源
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兰州大学学报. 自然科学版
,2011,47(1):73-77 【核心库】
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关键词
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放牧强度
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微生物量
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代谢熵
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青藏高原
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地址
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兰州大学, 干旱与草地农业生态教育部重点实验室, 兰州, 730000
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0455-2059 |
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学科
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农业基础科学 |
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基金
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国家自然科学基金重点项目
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文献收藏号
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CSCD:4159284
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