干旱区生态环境知识资源中心(Arid): Aridity creates global thresholds in soil nitrogen retention and availability

Arid

DOI	10.1111/gcb.17003
	Aridity creates global thresholds in soil nitrogen retention and availability
	Elrys, Ahmed S.; El-Maati, Mohamed F. Abo; Dan, Xiaoqian; Wen, Yuhong; Mou, Jinxia; Abdelghany, Ahmed Elsayed; Uwiragiye, Yves; Tang, Shuirong; Wu, Yanzheng; Meng, Lei; Zhang, JinBo; Mueller, Christoph
通讯作者	Meng, L ; Zhang, JB
来源期刊	GLOBAL CHANGE BIOLOGY
ISSN	1354-1013
EISSN	1365-2486
出版年	2024
卷号	30 期号:1
英文摘要	Identifying tipping points in the relationship between aridity and gross nitrogen (N) cycling rates could show critical vulnerabilities of terrestrial ecosystems to climate change. Yet, the global pattern of gross N cycling response to aridity across terrestrial ecosystems remains unknown. Here, we collected 14,144 observations from 451 N-15-labeled studies and used segmented regression to identify the global threshold responses of soil gross N cycling rates and soil process-related variables to aridity index (AI), which decreases as aridity increases. We found on a global scale that increasing aridity reduced soil gross nitrate consumption but increased soil nitrification capacity, mainly due to reduced soil microbial biomass carbon (MBC) and N (MBN) and increased soil pH. Threshold response of gross N production and retention to aridity was observed across terrestrial ecosystems. In croplands, gross nitrification and extractable nitrate were inhibited with increasing aridity below the threshold AI similar to 0.8-0.9 due to inhibited ammonia-oxidizing archaea and bacteria, while the opposite was favored above this threshold. In grasslands, gross N mineralization and immobilization decreased with increasing aridity below the threshold AI similar to 0.5 due to decreased MBN, but the opposite was true above this threshold. In forests, increased aridity stimulated nitrate immobilization below the threshold AI similar to 1.0 due to increased soil C/N ratio, but inhibited ammonium immobilization above the threshold AI similar to 1.3 due to decreased soil total N and increased MBC/MBN ratio. Soil dissimilatory nitrate reduction to ammonium decreased with increasing aridity globally and in forests when the threshold AI similar to 1.4 was passed. Overall, we suggest that any projected increase in aridity in response to climate change is likely to reduce plant N availability in arid regions while enhancing it in humid regions, affecting the provision of ecosystem services and functions.
英文关键词	N-15 isotope dilution climate change drought drylands nitrification capacity nitrogen retention
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001102656100001
WOS关键词	GROSS-N-TRANSFORMATION ; DISSIMILATORY NITRATE REDUCTION ; MICROBIAL COMMUNITY STRUCTURE ; LAND-USE CHANGE ; MINERALIZATION-IMMOBILIZATION-TURNOVER ; ATMOSPHERIC CARBON-DIOXIDE ; GREENHOUSE-GAS EMISSIONS ; KOREAN PINE PLANTATION ; ACIDIC FOREST SOILS ; N2O EMISSIONS
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403979
推荐引用方式 GB/T 7714	Elrys, Ahmed S.,El-Maati, Mohamed F. Abo,Dan, Xiaoqian,et al. Aridity creates global thresholds in soil nitrogen retention and availability[J],2024,30(1).
APA	Elrys, Ahmed S..,El-Maati, Mohamed F. Abo.,Dan, Xiaoqian.,Wen, Yuhong.,Mou, Jinxia.,...&Mueller, Christoph.(2024).Aridity creates global thresholds in soil nitrogen retention and availability.GLOBAL CHANGE BIOLOGY,30(1).
MLA	Elrys, Ahmed S.,et al."Aridity creates global thresholds in soil nitrogen retention and availability".GLOBAL CHANGE BIOLOGY 30.1(2024).