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Warming Stimulated Soil Respiration in a subalpine meadow in North China

Wuhan University Journal of Natural Sciences 2023年第1期28卷 77-87页

作者： LUO Shuzheng ZHANG Jianhua ZHANG Hufang ZHENG Qingrong GAO Yongping LI Meihong Department of Biological Sciences Xinzhou Teachers UniversityXinzhou 034000ShanxiChina Department of Geography Xinzhou Teachers UniversityXinzhou 034000ShanxiChina Shanxi Provincial Wutai Mountain State Forestry Administration Xinzhou 034000ShanxiChina Shanxi Provincial Nature Reserve of Abies nephrolepis Xinzhou 034000ShanxiChina

In order to explore the response of soil respiration in grassland to global warming,we carried out a warming experiment with open top chambers(OTCs)in the subalpine meadow,Mount Wutai in north China.Our results showed in the subalpine meadow across 2500-2700 m above the sea level(ASL),with OTCs,soil respiration increased by 2.00μmol·m^(-2)·s^(-1)as soil temperature increased by 1.25℃on average.Warming decreased soil moisture over the experiment periods except in October 2019 when snow melted in OTCs.Warming effect on soil respiration peaked at 178.31%in October 2019.In control and warming treatment,based on exponential regression equations,soil temperature alone accounted for 85.3%and 61.2%of soil respiration variation,respectively.In control treatment soil moisture alone explained 23.2%of soil respiration variation based on the power regression equation while in warming treatment they were not significantly correlated with each other.The response of soil respiration to warming relied on altitudes as well as the time of the year,but was not inhibited by soil moisture,labile carbon pool,and available nitrogen.We concluded soil temperature was the main factor influencing soil respiration,and global warming would stimulate soil respiration in the subalpine meadows of Mount Wutai in the future.Our analysis provided new data on characteristics and mechanisms of the response of soil respiration to warming,and helped to further understand the relationship between carbon cycle and climate change.

关键词： global warming soil respiration open top chambers(OTCs) the subalpine meadow Mount Wutai

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