放牧和刈割对内蒙古典型草原土壤可提取碳和氮的影响

发布时间：2018-03-13 18:05

本文选题：放牧　切入点：刈割　出处：《应用生态学报》2017年10期 　论文类型：期刊论文

【摘要】：依托内蒙古典型草原的长期野外放牧控制试验,探讨了放牧和刈割对土壤有机碳、全氮、可提取碳和氮、微生物生物量碳和氮的影响.结果表明:放牧使可提取有机碳降低11.4%~37.1%,而刈割使可提取有机碳升高5.8%.放牧和刈割分别使可提取氮升高10%~340%和10%~240%.放牧强度不高于6.0 sheep·hm~(-2)的条件下有利于维持甚至增加微生物生物量碳,而重度放牧(7.5和9.0 sheep·hm~(-2))则减少微生物生物量碳.刈割处理下微生物生物量碳和氮分别升高31.0%和9.8%.通径分析表明,放牧处理下微生物生物量碳的主要影响因素是有机碳、可提取全氮和全氮,其中直接影响因素是有机碳和可提取全氮;微生物生物量氮的主要影响因素是土壤pH、可提取有机碳、有机碳和可提取全氮,其中直接影响因素是有机碳和可提取全氮.刈割及轻度和中度放牧有利于维持或改善土壤功能,重度放牧将引起土壤退化.
[Abstract]:Based on the long-term field grazing control experiment of typical grassland in Inner Mongolia, the effects of grazing and cutting on soil organic carbon, total nitrogen, carbon and nitrogen were discussed. Effects of microbial biomass carbon and nitrogen. The results showed that grazing reduced the extractable organic carbon by 11.437. 1, while mowing increased the extractable organic carbon by 5.8. Grazing and mowing increased the extractable nitrogen by 10 ~ 340% and 10 ~ 240%, respectively. The grazing intensity was not higher than 6.0 sheep 路hm ~ (-2). Conditions are conducive to maintaining or even increasing microbial biomass carbon, The microbial biomass carbon was reduced by heavy grazing (7.5 and 9.0 sheep 路hmm-2), and the microbial biomass carbon and nitrogen increased by 31.0% and 9.8 under cutting treatment, respectively. Path analysis showed that organic carbon was the main influencing factor of microbial biomass carbon under grazing treatment. Total nitrogen and total nitrogen can be extracted, among which organic carbon and total nitrogen can be directly affected, and the main influencing factors of microbial biomass nitrogen are soil pH, organic carbon, organic carbon and total nitrogen. Among them, organic carbon and total nitrogen can be extracted directly. Cutting and light and moderate grazing are beneficial to maintain or improve soil function, and heavy grazing will cause soil degradation.
【作者单位】：中国科学院植物研究所植被与环境变化国家重点实验室;中国科学院大学;
【基金】：国家自然科学基金项目(41271316,30970495) 科技部科技基础性工作专项(2014FY210300)资助~~
【分类号】：S812.2

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