Arid
DOI10.1111/jvs.12476
The influence of seasonal precipitation and grass competition on 20years of forb dynamics in northern Chihuahuan Desert grassland
Mulhouse, John M.1; Hallett, Lauren M.2,3,4; Collins, Scott L.1
通讯作者Mulhouse, John M.
来源期刊JOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
EISSN1654-1103
出版年2017
卷号28期号:2页码:250-259
英文摘要

AimsIn arid grasslands forbs represent a large component of species diversity and provide a key resource for pollinators and consumers. However, low abundances and high temporal variability make it challenging to successfully predict forb presence and abundance from 1yr to the next. In this study we: (1) characterize patterns of semi-arid forb diversity and abundance over time; (2) determine the relative importance of direct vs indirect (via grass competition) effects of precipitation on forb richness and abundance; and (3) separate the effect of precipitation timing on forb community composition from the effects of precipitation amount and season.


LocationSemi-arid grassland, Sevilleta National Wildlife Refuge, Socorro County, central New Mexico, USA.


MethodsWe analysed forb dynamics along two 400-m long line-intercept transects in response to inter-annual and seasonal precipitation variability and abundance of perennial grasses using a unique 20-yr species composition data set from ungrazed native grassland in the northern Chihuahuan Desert.


ResultsForb richness and cover were significantly positively associated with precipitation across seasons. Total richness was high across the time series but substantially lower within any given year. A direct, positive effect of precipitation overrode any potential negative, indirect effect via grass competition. Although aggregate forb responses were strongly linked with precipitation, individual species responses were highly variable and generally not linked with either precipitation timing or season.


ConclusionsIn the hotter, drier climate predicted by meteorological models for the US southwest, forbs may be negatively impacted if winter moisture decreases and monsoon precipitation becomes more variable. On the other hand, the flexibility exhibited by forbs in germination and establishment throughout the growing season may help buffer some common species to increased inter-annual precipitation variability.


英文关键词Chihuahuan Desert Core-satellite hypothesis Forbs Grasslands Species richness Temporal distribution pattern Vegetation dynamics
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000397559100003
WOS关键词NET PRIMARY PRODUCTION ; CLIMATE-CHANGE ; ARIDLAND ECOSYSTEM ; TEMPORAL DYNAMICS ; PLANT-COMMUNITIES ; TALLGRASS PRAIRIE ; SPATIAL-PATTERNS ; UNITED-STATES ; NEW-MEXICO ; VARIABILITY
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/200876
作者单位1.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;
2.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80303 USA;
3.Univ Oregon, Environm Studies Program, Eugene, OR 97403 USA;
4.Univ Oregon, Dept Biol, Eugene, OR 97403 USA
推荐引用方式
GB/T 7714
Mulhouse, John M.,Hallett, Lauren M.,Collins, Scott L.. The influence of seasonal precipitation and grass competition on 20years of forb dynamics in northern Chihuahuan Desert grassland[J],2017,28(2):250-259.
APA Mulhouse, John M.,Hallett, Lauren M.,&Collins, Scott L..(2017).The influence of seasonal precipitation and grass competition on 20years of forb dynamics in northern Chihuahuan Desert grassland.JOURNAL OF VEGETATION SCIENCE,28(2),250-259.
MLA Mulhouse, John M.,et al."The influence of seasonal precipitation and grass competition on 20years of forb dynamics in northern Chihuahuan Desert grassland".JOURNAL OF VEGETATION SCIENCE 28.2(2017):250-259.
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