Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1890/12-0651.1 |
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
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ISSN | 0012-9658 |
EISSN | 1939-9170 |
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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