Arid
DOI10.1111/j.1461-0248.2004.00615.x
Below-ground competition between trees and grasses may overwhelm the facilitative effects of hydraulic lift
Ludwig, F; Dawson, TE; Prins, HHT; Berendse, F; de Kroon, H
通讯作者Ludwig, F
来源期刊ECOLOGY LETTERS
ISSN1461-023X
出版年2004
卷号7期号:8页码:623-631
英文摘要

Under large East African Acacia trees, which were known to show hydraulic lift, we experimentally tested whether tree roots facilitate grass production or compete with grasses for below-ground resources. Prevention of tree-grass interactions through root trenching led to increased soil water content indicating that trees took up more water from the topsoil than they exuded via hydraulic lift. Biomass was higher in trenched plots compared to controls probably because of reduced competition for water. Stable isotope analyses of plant and source water showed that grasses which competed with trees used a greater proportion of deep water compared with grasses in trenched plots. Grasses therefore used hydraulically lifted water provided by trees, or took up deep soil water directly by growing deeper roots when competition with trees occurred. We conclude that any facilitative effect of hydraulic lift for neighbouring species may easily be overwhelmed by water competition in (semi-) arid regions.


英文关键词Acacia tortilis facilitation soil water stable isotopes tree-grass interactions
类型Article
语种英语
国家Netherlands ; USA
收录类别SCI-E
WOS记录号WOS:000222716600002
WOS关键词AFRICAN HUMID SAVANNA ; MOJAVE DESERT ; WATER-UPTAKE ; ROOTING PATTERNS ; EAST-AFRICA ; PLANTS ; VEGETATION ; SHRUBS ; TRANSPORT ; NUTRIENTS
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/2XILL650/146621
作者单位(1)Univ Wageningen & Res Ctr, Subdept Nat Conservat, NL-6708 PD Wageningen, Netherlands;(2)Univ Calif Berkeley, Dept Integrat Biol, Ctr Stable Isotope Biogeochem, Berkeley, CA 94720 USA
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GB/T 7714
Ludwig, F,Dawson, TE,Prins, HHT,et al. Below-ground competition between trees and grasses may overwhelm the facilitative effects of hydraulic lift[J]. University of California, Berkeley,2004,7(8):623-631.
APA Ludwig, F,Dawson, TE,Prins, HHT,Berendse, F,&de Kroon, H.(2004).Below-ground competition between trees and grasses may overwhelm the facilitative effects of hydraulic lift.ECOLOGY LETTERS,7(8),623-631.
MLA Ludwig, F,et al."Below-ground competition between trees and grasses may overwhelm the facilitative effects of hydraulic lift".ECOLOGY LETTERS 7.8(2004):623-631.
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