Arid
DOI10.1007/s00442-002-1119-x
Hydraulic lift in Acacia tortilis trees on an East African savanna
Ludwig, F; Dawson, TE; de Kroon, H; Berendse, F; Prins, HHT
通讯作者Ludwig, F
来源期刊OECOLOGIA
ISSN0029-8549
出版年2003
卷号134期号:3页码:293-300
英文摘要

Recent studies suggest that savanna trees in semi-arid areas can increase understorey plant production. We hypothesized that one of the mechanisms that explains the facilitation between trees and grasses in East African savannas is hydraulic lift (HL). HL in large Acacia tortilis trees was studied during the first 3 months of the dry season during a relatively wet year (1998) and a very dry year (2000). In 1998, we found distinct diel fluctuation in soil water potential (psi(S)), with increasing values during the night and decreasing again the following day. These fluctuations in psi(S), are consistent with other observations of HL and in A tortilis were found up to 10 in from the tree. In 2000, during a severe drought, fs measurements indicated that HL was largely absent. The finding that HL occurred in wetter years and not in drier years was supported by data obtained on the 5180 values in soil, rain and groundwater. The 6180 of water extracted from the xylem water of grasses indicated that when they grew near trees they had values similar to those of groundwater. This could be because they either (1) use water from deeper soil layers or (2) use hydraulically lifted water provided by the tree; this was not seen in the same grass species growing outside tree canopies. While our data indicate that HL indeed occurs under Acacia trees, it is also true that psi(S) was consistently lower under trees when compared to outside tree canopies. We believe that this is because tree-grass mixtures take up more water from the upper soil layers than is exuded by the tree each night. This limits the beneficial effect of HL for understorey grasses and suggests that in savannas both facilitation via HL and competition are active processes. The importance of each process may depend upon how wet or dry that particular site or year is.


英文关键词competition facilitation stable isotopes tree-grass interactions soil water
类型Article
语种英语
国家Netherlands ; USA
收录类别SCI-E
WOS记录号WOS:000181645100001
WOS关键词WATER-UPTAKE ; SOIL-WATER ; ARTEMISIA-TRIDENTATA ; GRASS INTERACTIONS ; ROOTING PATTERNS ; HUMID SAVANNA ; PLANTS ; WOODY ; KENYA ; 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/2XILL650/145530
作者单位(1)Univ Wageningen & Res Ctr, Subdept Nature Conservat, NL-6708 PD Wageningen, Netherlands;(2)Univ Calif Berkeley, Dept Integrat Biol, Ctr Stable Isotope Biogeochem, Berkeley, CA 94720 USA;(3)Univ Georgia, Dept Plant Biol, Athens, GA 30602 USA;(4)Univ Nijmegen, Dept Ecol, NL-6525 ED Nijmegen, Netherlands
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GB/T 7714
Ludwig, F,Dawson, TE,de Kroon, H,et al. Hydraulic lift in Acacia tortilis trees on an East African savanna[J]. University of California, Berkeley,2003,134(3):293-300.
APA Ludwig, F,Dawson, TE,de Kroon, H,Berendse, F,&Prins, HHT.(2003).Hydraulic lift in Acacia tortilis trees on an East African savanna.OECOLOGIA,134(3),293-300.
MLA Ludwig, F,et al."Hydraulic lift in Acacia tortilis trees on an East African savanna".OECOLOGIA 134.3(2003):293-300.
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