放牧对冷蒿根际土壤微生物量碳、氮和土壤呼吸的影响

发布时间：2018-03-06 21:23

本文选题：土壤学　切入点：微生物量碳　出处：《浙江农林大学学报》2017年05期 　论文类型：期刊论文

【摘要】：为揭示放牧扰动对冷蒿Artemisia frigida根际土壤微生物量碳(MBC),微生物量氮(MBN)和基础呼吸等的影响,以内蒙古典型草原为对象,采用氯仿熏蒸浸提法和LI-7000 CO_2/H_2O分析仪,对轻度(LG)和重度(HG)放牧处理后的冷蒿根际土壤进行了MBC,MBN和基础呼吸及其相关性等研究。结果表明:随着放牧强度的增加,土壤MBC,MBN质量分数和基础呼吸速率均呈现先升高后降低的趋势,而且根际土壤值均高于非根际土壤,根际与非根际土壤中微生物量氮质量分数增加幅度高于微生物量碳;冷蒿根际土壤中MBC,MBN和基础呼吸速率与有机质、全氮、碱解氮、全钾呈显著(P0.05)或极显著(P0.01)正相关。这些土壤养分是影响MBC和MBN等的主要因素。表明放牧处理改变了冷蒿根际土壤中微生物量碳、氮质量分数及基础呼吸速率,轻度放牧能够促使冷蒿根际土壤微生物量和微生物基础呼吸速率显著增加,冷蒿根际能够缓解重度放牧对土壤微生物造成的影响。
[Abstract]:In order to reveal the effects of grazing disturbance on microbial biomass (MBC), microbial biomass (MBN) and basic respiration in rhizosphere soil of Artemisia Artemisia frigida, chloroform fumigation extraction method and LI-7000 CO_2/H_2O analyzer were used in typical grassland of Inner Mongolia. MBC MBN, basal respiration and their correlation were studied in the rhizosphere soil of Artemisia frigida treated by light and heavy HG grazing. The results showed that: with the increase of grazing intensity, The mass fraction of MBC MBN and the basic respiration rate increased first and then decreased, and the value of rhizosphere soil was higher than that of non-rhizosphere soil, and the increase of microbial biomass nitrogen content in rhizosphere and non-rhizosphere soil was higher than that in microbial biomass carbon. MBC MBN, basic respiration rate and organic matter, total nitrogen, alkali-hydrolyzed nitrogen in Artemisia annua rhizosphere soil. These soil nutrients were the main factors affecting MBC and MBN, which indicated that grazing treatment changed microbial biomass carbon, nitrogen mass fraction and basic respiration rate of Artemisia frigida rhizosphere soil. Light grazing could significantly increase soil microbial biomass and microbial basic respiration rate in rhizosphere of Artemisia frigida, and alleviate the effect of heavy grazing on soil microorganism.
【作者单位】：浙江农林大学省部共建亚热带森林培育国家重点实验室;国家林业局竹子研究开发中心;内蒙古大学生命科学学院;
【基金】：国家自然科学基金资助项目(31270756,31470704) 国家重点基础研究发展计划(“973”计划)项目(2014CB138805) 国家科技支撑计划项目(2013BAC09B03)
【分类号】：S812.2

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