干旱区生态环境知识资源中心(Arid): Muted responses to chronic experimental nitrogen deposition on the Colorado Plateau

Arid

DOI	10.1007/s00442-020-04841-3
	Muted responses to chronic experimental nitrogen deposition on the Colorado Plateau
	Phillips, Michala L.; Winkler, Daniel E.; Reibold, Robin H.; Osborne, Brooke B.; Reed, Sasha C.
通讯作者	Phillips, ML (corresponding author), US Geol Survey, Southwest Biol Sci Ctr, Moab, UT 84532 USA.
来源期刊	OECOLOGIA
ISSN	0029-8549
EISSN	1432-1939
出版年	2021
卷号	195 期号:2 页码:513-524
英文摘要	Anthropogenic nitrogen (N) deposition is significantly altering both community structure and ecosystem processes in terrestrial ecosystems across the globe. However, our understanding of the consequences of N deposition in dryland systems remains relatively poor, despite evidence that drylands may be particularly vulnerable to increasing N inputs. In this study, we investigated the influence of 7 years of multiple levels of simulated N deposition (0, 2, 5, and 8 kg N ha(-1) year(-1)) on plant community structure and biological soil crust (biocrust) cover at three semi-arid grassland sites spanning a soil texture gradient. Biocrusts are a surface community of mosses, lichens, cyanobacteria, and/or algae, and have been shown to be sensitive to N inputs. We hypothesized that N additions would decrease plant diversity, increase abundance of the invasive annual grass Bromus tectorum, and decrease biocrust cover. Contrary to our expectations, we found that N additions did not affect plant diversity or B. tectorum abundance. In partial support of our hypotheses, N additions negatively affected biocrust cover in some years, perhaps driven in part by inter-annual differences in precipitation. Soil inorganic N concentrations showed rapid but ephemeral responses to N additions and plant foliar N concentrations showed no response, indicating that the magnitude of plant and biocrust responses to N fertilization may be buffered by endogenous N cycling. More work is needed to determine N critical load thresholds for plant community and biocrust dynamics in semi-arid systems and the factors that determine the fate of N inputs.
英文关键词	Arches national park Biocrusts Bromus tectorum Cheatgrass Drylands Global change Non-native plant invasion Soil chemistry
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000605944300001
WOS关键词	COASTAL SAGE SCRUB ; SOUTHERN CALIFORNIA ; CHIHUAHUAN DESERT ; PLANT DIVERSITY ; CRITICAL LOADS ; BIODIVERSITY ; FERTILIZATION ; PRECIPITATION ; TEMPERATURE ; ECOSYSTEMS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351230
作者单位	[Phillips, Michala L.; Winkler, Daniel E.; Reibold, Robin H.; Osborne, Brooke B.; Reed, Sasha C.] US Geol Survey, Southwest Biol Sci Ctr, Moab, UT 84532 USA
推荐引用方式 GB/T 7714	Phillips, Michala L.,Winkler, Daniel E.,Reibold, Robin H.,et al. Muted responses to chronic experimental nitrogen deposition on the Colorado Plateau[J]. United States Geological Survey,2021,195(2):513-524.
APA	Phillips, Michala L.,Winkler, Daniel E.,Reibold, Robin H.,Osborne, Brooke B.,&Reed, Sasha C..(2021).Muted responses to chronic experimental nitrogen deposition on the Colorado Plateau.OECOLOGIA,195(2),513-524.
MLA	Phillips, Michala L.,et al."Muted responses to chronic experimental nitrogen deposition on the Colorado Plateau".OECOLOGIA 195.2(2021):513-524.