Grazing-induced changes in soil microclimate and aboveground biomass modulate freeze-thaw processes in a Tibetan alpine meadow

	Grazing-induced changes in soil microclimate and aboveground biomass modulate freeze-thaw processes in a Tibetan alpine meadow
	Wang, Xiang; Zi, Hongbiao; Wang, Jianbin; Guo, Xiaowei; Zhang, Zhenhua; Yan, Tao; Wang, Qiang; He, Jin-Sheng
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2023
卷号	357
英文摘要	Grazing is the most important disturbance to grasslands, especially on the Tibetan Plateau, which sustains the livelihoods of tens of thousands of herders. However, the effects of grazing intensity and associated changes in vegetation on freeze-thaw processes (FTPs) in seasonal permafrost regions remain unclear. Here, two years of continuous in situ observations from a controlled grazing intensity experiment were used to examine FTPs and influencing factors in an alpine meadow on the Eastern Tibetan Plateau. Our results showed that a higher grazing intensity led to a shorter frozen period, extended freezing and thawing periods, and earlier initiation of freezing and thawing periods. Furthermore, grazing increased soil temperature and active (> 0 degrees C) and effective (> 10 degrees C) accumulated temperatures. The soil diurnal temperature range increased linearly with grazing intensity, whereas soil moisture did not vary with soil temperature. Our results demonstrated that the freezing and frozen periods were mainly influenced by soil temperature and the diurnal temperature range, whereas soil moisture played a critical role in the variation in the thawing period. The reduction in aboveground biomass elicited changes in FTPs, including shortening of the frozen period and lengthening of the thawing and freezing periods. Collectively, our results highlight that the combination of grazing-induced changes in vegetation and changes in subsurface temperature and moisture leads to changes in freezing and thawing processes.
内容类型	期刊论文
源URL	[http://210.75.249.4/handle/363003/61613]
专题	西北高原生物研究所_中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Wang, Xiang,Zi, Hongbiao,Wang, Jianbin,et al. Grazing-induced changes in soil microclimate and aboveground biomass modulate freeze-thaw processes in a Tibetan alpine meadow[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2023,357.
APA	Wang, Xiang.,Zi, Hongbiao.,Wang, Jianbin.,Guo, Xiaowei.,Zhang, Zhenhua.,...&He, Jin-Sheng.(2023).Grazing-induced changes in soil microclimate and aboveground biomass modulate freeze-thaw processes in a Tibetan alpine meadow.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,357.
MLA	Wang, Xiang,et al."Grazing-induced changes in soil microclimate and aboveground biomass modulate freeze-thaw processes in a Tibetan alpine meadow".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 357(2023).