Arid
DOI10.1890/12-0651.1
Intra-annual rainfall regime shifts competitive interactions between coastal sage scrub and invasive grasses
Goldstein, Leah J.1; Suding, Katharine N.2
通讯作者Goldstein, Leah J.
来源期刊ECOLOGY
ISSN0012-9658
EISSN1939-9170
出版年2014
卷号95期号:2页码:425-435
英文摘要

Changes in rainfall distribution, generally predicted by many climate models, can affect resource dynamics and ecosystem function. While little studied, intra-annual rainfall distribution may have particularly strong effects on competitive interactions. Here, we test whether increased rainfall event size and decreased frequency within a growing season can influence competitive dynamics related to the invasion of exotic annual grasses in California coastal sage scrub (CSS). We hypothesized that larger rainfall events and decreased frequency will increase the competitive ability of native CSS species: a deeper root system will permit greater water use during dry periods between pulses and enhance their resource depletion effect on more shallow-rooted grasses. We planted grass and CSS seedlings in an additive competition design under three rainfall treatments: frequent small events, infrequent large events, and infrequent small events. The first two treatments had the same total rainfall but different frequency, while the second and third treatments had the same frequency but different total rainfall. Rainfall treatment altered the competitive interactions between CSS and grasses. In the first year, the competitive effect of annual grasses on shrub seedlings was strongest under the frequent small rainfall regime where they reduced deep soil moisture and light. In year two, the established shrubs began to exert strong competitive effects on grasses, and these effects were strongest under the infrequent small rainfall regime (low total rain) where they reduced shallow soil moisture and decreased grass stomatal conductance. Results suggest that reductions in both rainfall frequency and total rainfall may be important to competitive interactions, and can alter plant community composition and invasion when species have different rooting depths and different responses to soil moisture.


英文关键词annual grass climate change coastal sage scrub competition intra-annual rainfall distribution invasion resources root distribution soil moisture southern California
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000331429500016
WOS关键词TERRESTRIAL ECOSYSTEMS ; PRECIPITATION VARIABILITY ; SPECIES INTERACTIONS ; PLANT-COMMUNITIES ; RESOURCE PULSES ; CLIMATE-CHANGE ; SOIL-WATER ; GRASSLAND ; RESPONSES ; DESERT
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/2XILL650/181707
作者单位1.Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA;
2.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA
推荐引用方式
GB/T 7714
Goldstein, Leah J.,Suding, Katharine N.. Intra-annual rainfall regime shifts competitive interactions between coastal sage scrub and invasive grasses[J]. University of California, Berkeley,2014,95(2):425-435.
APA Goldstein, Leah J.,&Suding, Katharine N..(2014).Intra-annual rainfall regime shifts competitive interactions between coastal sage scrub and invasive grasses.ECOLOGY,95(2),425-435.
MLA Goldstein, Leah J.,et al."Intra-annual rainfall regime shifts competitive interactions between coastal sage scrub and invasive grasses".ECOLOGY 95.2(2014):425-435.
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