Acta Agrestia Sinica ›› 2018, Vol. 26 ›› Issue (2): 267-276.DOI: 10.11733/j.issn.1007-0435.2018.02.001

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A Review: Effects of Grazing on Soil Organic Carbon and the Related Processes

ZHANG Meng, LI Xiao-bing   

  1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
  • Received:2017-07-07 Revised:2018-04-10 Online:2018-04-15 Published:2018-07-05

放牧对土壤有机碳的影响及相关过程研究进展

张蒙, 李晓兵   

  1. 北京师范大学地理科学学部, 地表过程与资源生态国家重点实验室, 北京, 100875
  • 通讯作者: 李晓兵
  • 作者简介:张蒙(1988-),女,河北石家庄人,博士研究生,主要从事草地生态学研究,E-mail:zhangmeng201114@163.com
  • 基金资助:

    国家重点研发计划(2016YFC0500502);国家重点基础研究发展计划(973计划)(2014CB138803);国家自然科学基金项目(31570451);长江学者和创新团队发展计划(IRT_15R06)资助

Abstract:

Grassland ecosystem plays a key role in global carbon cycle, but overgrazing leads to the degeneration of grassland in large areas. Soil organic carbon is a comprehensive index of soil quality, but comprehensive analysis of the mechanism by which grazing affects soil organic carbon is limited. Grazing can influence soil organic carbon through the processes of input, transformation, emission of soil organic carbon as well as soil microenvironment. This review analyzed the effects of grazing on soil organic carbon and active fractions through the above aspects and discussed the impact mechanism. Due to the selective feeding and trampling of animals and the different recovery capacity of vegetation as well as the effects of livestock excreta, different grazing intensity changed the biological and non-biological factors that could affect soil organic carbon. Thus, soil organic carbon maintained dynamic balance or changes under the combined effects of multiple factors. The published results were not consistent due to the different plant community characteristics, soil physicochemical properties, grazing duration and diverse experimental methods, etc. While most studies focused on only one or a few factors under grazing. In the future, it is necessary to observe the total soil organic carbon and active fractions under different grassland conditions, make multi-factor interaction analysis and quantitative analysis, and analyze coupling effects of other elements, all of which could help understand the impact of grazing on soil organic carbon and the mechanism, and then provide scientific basis for the sustainable utilization of grassland.

Key words: Grazing, Soil organic carbon, Caron input, Carbon transformation, Carbon emission, Soil microenvironment

摘要:

草地生态系统在全球碳循环中起着重要作用,但过度放牧造成大面积的草地退化,土壤有机碳是反映土壤质量状况的综合指标,但迄今仍无较好的理论解释放牧对土壤有机碳影响的机理。放牧可通过影响土壤有机碳的输入与分配、转化利用和输出以及土壤微环境影响土壤有机碳,本文从上述各方面分析放牧对土壤有机碳及组分的影响,以探讨放牧对土壤有机碳的影响机理。由于动物的选择性采食、踩踏和植被自身恢复能力的差异以及家畜排泄物的影响,不同放牧强度改变了能影响土壤有机碳的生物因素和非生物因素,土壤有机碳在多因子的共同作用下保持动态平衡或发生着变化。由于植物群落特征和土壤理化性质的差异、放牧历史、实验方法多样等原因导致众多研究结果不尽一致。而目前多数研究只关注放牧作用下某个或少数因子对土壤有机碳的影响。在未来的研究中需针对不同的草地条件,对土壤总有机碳和组分进行观测,同时进行多因子交互作用整合分析,并加强定量分析和与其他元素循环耦合研究,有助于深入理解放牧对土壤有机碳影响的机理,进而为草原生态系统的可持续利用提供科学依据。

关键词: 放牧, 土壤有机碳, 输入与分配, 转化利用, 输出, 土壤微环境

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