Hydraulic lift in a neotropical savanna.Author(s): M.Z. Moreira; F.G. Scholz; S.J. Bucci; L.S. Sternberg; G. Goldstein; F.C. Meinzer; A.C. Franco
Source: Functional Ecology. 17: 573-581
Publication Series: Scientific Journal (JRNL)
PDF: View PDF (702 KB)
DescriptionWe report hydraulic lift in the sawmlia vegetation of central Brazil (Cerrado). Both heat-pulse measurements and isotopic (deuterium) labelling were used to determine whether hydraulic lift occurred in two common species, and whether neighbouring small shrubs and trees were utilizing this water.
Both techniques showed water uptake by tap-roots and reverse flow of water in lateral roots. Roots transferred hydraulically lifted water to the soil, and small shrubs and trees neighbouring the labelled individuals were labelled by deuterated water.
Isotopic mass-balance equations and sap-flow measurements showed that water taken up by the central tap-root in each individual constituted only a small percentage of total flux of water through the treated plants. Mass-balance equations also indicated that small shrubs and trees neighbouring the treated plants utilized only a few thousandths Of a per cent of the label.
The small proportion of water uptake by the tap-root of these two species may be limiting hydraulic lift in this system, unless sinker roots descending from lateral roots contribute to hydraulic lift.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationMoreira, M.Z.; Scholz, F.G.; Bucci, S.J.; Sternberg, L.S.; Goldstein, G.; Meinzer, F.C.; Franco, A.C. 2003. Hydraulic lift in a neotropical savanna. Functional Ecology. 17: 573-581
KeywordsDeuterium labelling, heat pulse, hydraulic lilt, neotropical savanna, soil water redistribution.
- Biophysical and life-history determinants of hydraulic lift in Neotropical savanna trees
- Hydraulic lift in a neotropical savanna: experimental manipulation and model simulations
- Hydraulic redistribution by two semi-arid shrub species: implications for Sahelian agro-ecosystems
XML: View XML