globalchange  > 全球变化的国际研究计划
DOI: 10.1002/ecy.2802
WOS记录号: WOS:000483898300001
论文题名:
Invasion and drought alter phenological sensitivity and synergistically lower ecosystem production
作者: Esch, Ellen H.1; Lipson, David A.2; Cleland, Elsa E.3
通讯作者: Esch, Ellen H.
刊名: ECOLOGY
ISSN: 0012-9658
EISSN: 1939-9170
出版年: 2019
语种: 英语
英文关键词: climate change ; coastal sage scrub ; drylands ; exotic species ; Mediterranean type ecosystem ; Normalized Difference Vegetation Index
WOS关键词: NORTH-AMERICAN GRASSLANDS ; SEMIARID ECOSYSTEMS ; SHRUB ENCROACHMENT ; CLIMATE-CHANGE ; CARBON ; RESPONSES ; SHIFTS ; VARIABILITY ; FEEDBACKS ; DOMINANCE
WOS学科分类: Ecology
WOS研究方向: Environmental Sciences & Ecology
英文摘要:

Climate change and shifting species composition have influenced ecosystem-scale phenology worldwide. For instance, invasive plant species have greater vegetation phenological sensitivity to climate change than native plant species in some regions, and hence invasion could modify how ecosystem carbon gain responds to increased drought frequencies expected with climate change. Results from a 4-yr drought experiment show that invasion reduced ecosystem potential for carbon gain via increased sensitivity to reduced rainfall. Using canopy greenness (Normalized Difference Vegetation Index, NDVI) as a proxy for potential ecosystem carbon gain, we show that areas invaded by herbaceous species had up to a 70% reduction in maximum NDVI under severe drought conditions as compared to areas dominated by native shrubs. Phenological differences between herbaceous- and shrub-dominated vegetation contributed to this reduction in potential ecosystem carbon gain because invaded areas had delayed green-up, especially under drought conditions, and shrub senescence was accelerated by drought. Hence, invasion by herbaceous species and increased drought frequencies are likely to act synergistically to reduce ecosystem capacity for carbon gain in this system. Our findings suggest that predicting ecosystem responses to future climate change could be improved by projecting of the spread of invasive species and accounting for phenological variation between native and invading species.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/145774
Appears in Collections:全球变化的国际研究计划

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作者单位: 1.Univ Guelph, Dept Integrat Biol, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada
2.San Diego State Univ, Dept Biol, San Diego, CA 92182 USA
3.Univ Calif San Diego, Div Biol Sci, 9500 Gilman Dr 0116, La Jolla, CA 92093 USA

Recommended Citation:
Esch, Ellen H.,Lipson, David A.,Cleland, Elsa E.. Invasion and drought alter phenological sensitivity and synergistically lower ecosystem production[J]. ECOLOGY,2019-01-01
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