干旱区生态环境知识资源中心(Arid): Climate and geochemistry interactions at different altitudes influence soil organic carbon turnover times in alpine grasslands

Arid

DOI	10.1016/j.agee.2021.107591
	Climate and geochemistry interactions at different altitudes influence soil organic carbon turnover times in alpine grasslands
	Zhao, Yun Fei; Wang, Xia; Jiang, Si Long; Zhou, Xiao He; Liu, Hui Ying; Xiao, Jin Jin; Hao, Zhi Guo; Wang, Kai Chang
通讯作者	Wang, X (corresponding author), Lanzhou Univ, Coll Earth & Environm Sci, Gansu Key Lab Environm Pollut Predict & Control, Lanzhou 73000, Peoples R China.
来源期刊	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
ISSN	0167-8809
EISSN	1873-2305
出版年	2021
卷号	320
英文摘要	Soil organic carbon turnover time (tau) is a key component of the carbon cycle. However, the impact of geochemical and climatic conditions on tau remains poorly understood in high alpine regions. We investigated climatic variables [e.g. mean annual precipitation (MAP) and mean annual temperature (MAT)], as well as geochemical variables [e.g. soil total element content (Mn, Ti, Fe, Si, Al, Mg, Ca, Na, K, and P), soil clay content, and soil pH] and estimated tau in the 0-30 cm soil layer at 169 alpine grassland sites along a 3000 km-long transect on the Tibetan Plateau. We found that tau ranged from 4 to 289 years on the Tibetan Plateau and showed a decreasing trend from the northwest to southeast and an increasing trend with altitude. The estimated tau was 71(63)(78) years (mean with 95% confidence interval) in alpine meadows, which did not significantly differ from alpine steppes (76(65)(87) yr). Overall, using boosted regression tree analysis, geochemistry was the most important controlling factor for tau (54% of the relative effect on tau), followed by climate (36%), and altitude (10%). When examining the relative contribution of individual variables, we found that MAP was the primary predictor of tau, followed by soil Si content, and altitude. Notably, variation in tau was explained by precipitation rather than temperature. Altitude indirectly affected tau by regulating climatic and soil geochemical conditions. The direct negative effect of climate on tau was opposite the positive indirect effect of climate on tau via soil geochemistry. These results highlight the importance of considering the interactions of climatic and geochemical factors as well as hydrological conditions when predicting how carbon turnover in the soils of semi-arid alpine grasslands will respond to future climate change.
英文关键词	Alpine grassland Carbon turnover times Geochemistry Climate Altitude Tibet Plateau
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000691679600008
WOS关键词	TERRESTRIAL ECOSYSTEMS ; STORAGE ; TEMPERATURE ; STABILIZATION ; RESPIRATION ; DYNAMICS ; MATTER ; PRECIPITATION ; DECOMPOSITION ; PERMAFROST
WOS类目	Agriculture, Multidisciplinary ; Ecology ; Environmental Sciences
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368290
作者单位	[Zhao, Yun Fei; Wang, Xia; Jiang, Si Long; Zhou, Xiao He; Liu, Hui Ying; Xiao, Jin Jin; Hao, Zhi Guo; Wang, Kai Chang] Lanzhou Univ, Coll Earth & Environm Sci, Gansu Key Lab Environm Pollut Predict & Control, Lanzhou 73000, Peoples R China; [Zhao, Yun Fei; Wang, Xia; Jiang, Si Long; Zhou, Xiao He] Minist Educ, Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Yun Fei,Wang, Xia,Jiang, Si Long,et al. Climate and geochemistry interactions at different altitudes influence soil organic carbon turnover times in alpine grasslands[J]. 兰州大学,2021,320.
APA	Zhao, Yun Fei.,Wang, Xia.,Jiang, Si Long.,Zhou, Xiao He.,Liu, Hui Ying.,...&Wang, Kai Chang.(2021).Climate and geochemistry interactions at different altitudes influence soil organic carbon turnover times in alpine grasslands.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,320.
MLA	Zhao, Yun Fei,et al."Climate and geochemistry interactions at different altitudes influence soil organic carbon turnover times in alpine grasslands".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 320(2021).