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GEOGRAPHICAL RESEARCH >

2009 , Vol. 28 >Issue 4: 1040 - 1046

DOI: https://doi.org/10.11821/yj2009040018

Environment and Ecology

Effects of grazing on soil respiration in typical Leymus chinensis steppe in Inner Mongolia

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  • 1. College of Resource and Environment Science, Northwest Agricultural and Forestry University, Yangling 712100, China;
    2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    3. Institute of Soil and Water Conservation, CAS and Ministry of Water Resources|Yangling 712100, China;
    4. Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Received date: 2008-09-14

  Revised date: 2009-01-19

  Online published: 2009-07-25

Supported by

国家自然科学基金项目(40730105, 40673067, 40501072);国家科技支撑计划重大项目(2007BAC03A11-02);国家重点基础研究发展规划项目(2002CB412503)资助

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Abstract

Using the static opaque enclosed chamber, the seasonal dynamics and annual total amount of soil respiration in fence-enclosed and grazed Leymus chinensis steppes of Xilin River basin in Inner Mongolia, China, were compared in 2007, and its environmental driving factors were analyzed. The results showed that there was no significant difference between fenced and grazed plots in seasonal dynamics of soil respiration, but the grazed decreased the annual variation range of soil respiration. In growing season, the soil respiration rates were much lower in the grazed plot than in fence-enclosed plot, and annual soil respiration decreased by 33.95% due to the grazing, but in the non-growing season, there was little difference in soil respiration between the two sites. In a year round, soil respiration was positively correlated with the temperature, the Q10 values in fence-enclosed and grazing plots were 3.89 and 2.59, respectively, and grazing decreased the sensitivity of temperature sensitivity of soil respiration, while in the growing season, soil respiration was significantly related to soil moisture. In the fence-enclosed plot, soil respiration was affected by the soil water content at a depth of 0-10 cm, and the change of 0-10 cm soil water content accounted for 87.4% of variation of soil respiration. In the plot with grazing, soil water contents at depths of 10-20 and 20-30 cm were the main factors affecting the change of soil respiration, and the two factors could explain 74.9% of the total variation of soil respiration.

Key words： grazing; temperate typical grassland; Leymus chinensis steppe; soil respiration

Cite this article

MA Tao, DONG Yun-she, QI Yu-chun, XU Fu-li, PENG Qin, JIN Zhao . Effects of grazing on soil respiration in typical Leymus chinensis steppe in Inner Mongolia[J]. GEOGRAPHICAL RESEARCH, 2009 , 28(4) : 1040 -1046 . DOI: 10.11821/yj2009040018

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