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DOI	10.1007/s00442-020-04624-w
	CAM plant expansion favored indirectly by asymmetric climate warming and increased rainfall variability
	Huang, Heng 1; Yie, Kailiang 2; D'; Odorico, Paolo 1
通讯作者	Huang, Heng
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2020
卷号	193 期号:1 页码:1-13
英文摘要	Recent observational evidence suggests that nighttime temperatures are increasing faster than daytime temperatures, while in some regions precipitation events are becoming less frequent and more intense. The combined ecological impacts of these climatic changes on crassulacean acid metabolism (CAM) plants and their interactions with other functional groups (i.e., grass communities) remain poorly understood. Here we developed a growth chamber experiment to investigate how two CAM-grass communities in desert ecosystems of the southwestern United States and northern Mexico respond to asymmetric warming and increasing rainfall variability. Grasses generally showed competitive advantages over CAM plants with increasing rainfall variability under ambient temperature conditions. In contrast, asymmetric warming caused mortality of both grass species (Bouteloua eriopoda and Bouteloua curtipendula) in both rainfall treatments due to enhanced drought stress. Grass mortality indirectly favored CAM plants even though the biomass of both CAM species Cylindropuntia imbricata and Opuntia phaeacantha significantly decreased. The stem's volume-to-surface ratio of C. imbricata was significantly higher in mixture than in monoculture under ambient temperature (both P < 0.0014); however, the difference became insignificant under asymmetric warming (both P > 0.1625), suggesting that warming weakens the negative effects of interspecific competition on CAM plant growth. Our findings suggest that while the increase in intra-annual rainfall variability enhances grass productivity, asymmetric warming may lead to grass mortality, thereby indirectly favoring the expansion of co-existing CAM plants. This study provides novel experimental evidence showing how the ongoing changes in global warming and rainfall variability affect CAM-grass growth and interactions in dryland ecosystems.
英文关键词	Crassulacean acid metabolism Climate change Asymmetric warming Rainfall variability Drylands Competition
类型	Article
语种	英语
国家	USA ; Switzerland
收录类别	SCI-E
WOS记录号	WOS:000516379700001
WOS关键词	CRASSULACEAN ACID METABOLISM ; GLOBAL WATER CYCLE ; RELATIVE IMPORTANCE ; PRECIPITATION ; COMPETITION ; IMPACTS ; PHOTOSYNTHESIS ; DESERT ; TRENDS ; DESERTIFICATION
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315248
作者单位	1.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA; 2.Swiss Fed Inst Technol, Inst Integrat Biol, CH-8092 Zurich, Switzerland
推荐引用方式 GB/T 7714	Huang, Heng,Yie, Kailiang,D',et al. CAM plant expansion favored indirectly by asymmetric climate warming and increased rainfall variability[J]. University of California, Berkeley,2020,193(1):1-13.
APA	Huang, Heng,Yie, Kailiang,D',&Odorico, Paolo.(2020).CAM plant expansion favored indirectly by asymmetric climate warming and increased rainfall variability.OECOLOGIA,193(1),1-13.
MLA	Huang, Heng,et al."CAM plant expansion favored indirectly by asymmetric climate warming and increased rainfall variability".OECOLOGIA 193.1(2020):1-13.