Grazing season alters soil respiration in a semiarid grassland on the Loess Plateau
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ORIGINAL ARTICLE
Grazing season alters soil respiration in a semiarid grassland on the Loess Plateau Zhen Wang . Xiuli Wan . Mei Tian . Xiaoyan Wang . Junbo Chen . Xianjiang Chen . Shenghua Chang . Fujiang Hou
Received: 3 May 2020 / Accepted: 7 September 2020 / Published online: 15 September 2020 Ó Springer Nature B.V. 2020
Abstract Although the effects of grazing on soil respiration are well understood, there is still a lack of understanding about the mechanisms underlying the effects of grazing intensity on soil respiration. In addition, the response of soil respiration to the grazing season, such as warm- and cold-season grazing, remains unclear. To determine how grazing intensity (no, light grazing, moderate grazing, heavy grazing) and grazing season (warm-season grazing, WG; coldseason grazing, CG) affect soil respiration, we conducted soil respiration measurements in two long-term grazed grasslands under CG and WG from 2010 to 2011. Our results showed that light, moderate,
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10705-020-10092-8) contains supplementary material, which is available to authorized users. Z. Wang X. Wan M. Tian X. Wang J. Chen X. Chen S. Chang F. Hou State Key Laboratory of Grassland Agro-Ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, 768, Jiayuguan West Road, Lanzhou 730020, China Present Address: Z. Wang F. Hou (&) Key Laboratory of Grassland Agro-Ecosystem, Ministry of Agriculture, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, China e-mail: [email protected]
and heavy grazing significantly increased soil respiration relative to no grazing in 2010, but grazing intensity had little effect on soil respiration in 2011. With the increase in grazing intensity, soil respiration decreased by 10–17% at the WG site but increased by 23–30% at the CG site. Structural equation modeling analysis indicated that grazing intensity indirectly affected soil respiration by altering aboveground and soil microbial biomass carbon. CG enhanced soil respiration by 22% relative to WG. Grazing seasoninduced soil moisture, soil temperature, soil microbial biomass carbon and nitrogen could be mechanisms underlying increased soil respiration under in grazed grasslands. Precipitation had a strong correlation with soil respiration. Our results highlight the importance of grazing season altering soil respiration in semiarid grassland ecosystems and indicate that interactive effects of grazing season and precipitation events on soil respiration need to be considered in the future. Keywords Grazing intensity Grazing regime Grasslands Carbon dioxide efflux Biogeochemical cycles
Introduction Grasslands cover approximately 41% of Earth’s terrestrial surface and support domestic livestock
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grazing in extensive agricultural grazing
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