Abstract
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 2 500-2 700 m above the sea level(ASL),with OTCs,soil respiration increased by 2.00 pmol.m-2.s-1as 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 mois-ture 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 influenc-ing 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 under-stand the relationship between carbon cycle and climate change.
基金项目
Xinzhou Teachers University Project(2018KY02)
Shanxi Province Colleges/Universities Discipline Group Construction Plan Project for Service and Industry Innovation()
Program for the Philosophy and Social Sciences Research of Higher Learning Institutions of Shanxi(20210122)
NETL
NSTL
维普
万方数据