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DOI	10.1111/1365-2435.14595
	Nitrogen niche partitioning between tropical legumes and grasses conditionally weakens under elevated CO2
	Churchill, Amber C.; Zhang, Haiyang; Kim, Gil Won; Catunda, Karen L. M.; Anderson, Ian C.; Isbell, Forest; Moore, Ben; Pendall, Elise; Plett, Jonathan M.; Powell, Jeff R.; Power, Sally A.
发表日期	2024
ISSN	0269-8463
EISSN	1365-2435
英文摘要	Plant community biodiversity can be maintained, at least partially, by shifts in species interactions between facilitation and competition for resources as environmental conditions change. These interactions also drive ecosystem functioning, including productivity, and can promote over-yielding- an ecosystem service prioritized in agro-ecosystems, such as pastures, that occurs when multiple species together are more productive than the component species alone. Importantly, species interactions that can result in over-yielding may shift in response to rising C-O2 concentrations and changes in resource availability, and the consequences these shifts have on production is uncertain especially in the context of tropical mixed-species grasslands. We examined the relative performance of two species pairs of tropical pasture grasses and legumes growing in monoculture and mixtures in a glasshouse experiment manipulating CO2. We investigated how over-yielding can arise from nitrogen (N) niche partitioning and biotic facilitation using stable isotopes to differentiate soil N from biological N fixation (BNF) within N acquisition into above-ground biomass for these two-species mixtures. We found that N niche partitioning in species-level use of soil N versus BNF drove species interactions in mixtures. Importantly partitioning and overyielding were generally reduced under elevated CO2. However, this finding was mixture-dependent based on biomass of dominant species in mixtures and the strength of selection effects for the dominant species. This study demonstrates that rising atmospheric CO2 may alter niche partitioning between co-occurring species, with negative implications for the over-yielding benefits predicted for legume-grass mixtures in working landscapes with tropical species. Furthermore, these changes in inter-species interactions may have consequences for grassland composition that are not yet considered in larger-scale projections for impacts of climate change and species distributions.
英文关键词	biological nitrogen fixation; complementarity effect; elevated carbon dioxide; natural abundance N-15; nitrogen niche partitioning; tropical pastures
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Ecology
WOS记录号	WOS:001236291500001
来源期刊	FUNCTIONAL ECOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/290058
作者单位	Western Sydney University; University of Minnesota System; University of Minnesota Twin Cities; State University of New York (SUNY) System; State University of New York (SUNY) Binghamton; Hebei University; Gyeongsang National University
推荐引用方式 GB/T 7714	Churchill, Amber C.,Zhang, Haiyang,Kim, Gil Won,et al. Nitrogen niche partitioning between tropical legumes and grasses conditionally weakens under elevated CO2[J],2024.
APA	Churchill, Amber C..,Zhang, Haiyang.,Kim, Gil Won.,Catunda, Karen L. M..,Anderson, Ian C..,...&Power, Sally A..(2024).Nitrogen niche partitioning between tropical legumes and grasses conditionally weakens under elevated CO2.FUNCTIONAL ECOLOGY.
MLA	Churchill, Amber C.,et al."Nitrogen niche partitioning between tropical legumes and grasses conditionally weakens under elevated CO2".FUNCTIONAL ECOLOGY (2024).