globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2013.01.003
Scopus记录号: 2-s2.0-84873111590
论文题名:
Comparison of water-use by alien invasive pine trees growing in riparian and non-riparian zones in the Western Cape Province, South Africa
作者: Dzikiti S.; Schachtschneider K.; Naiken V.; Gush M.; Le Maitre D.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2013
卷: 293
起始页码: 92
结束页码: 102
语种: 英语
英文关键词: Evapotranspiration ; Sap flow ; Scintillometer ; Transpiration ; Two-source model
Scopus关键词: Annual transpiration ; Available energy ; Basal area ; Driving factors ; Heat pulse ; Individual tree ; Net radiation ; Pine forest ; Pine stand ; Pine trees ; Pinus pinaster ; Riparian habitats ; Riparian zones ; Sap flow ; Scintillometer ; Sensible heat flux ; Soil evaporations ; Soil heat flux ; South Africa ; Submodels ; Transpiration rates ; Two layer model ; Two-source model ; Visual differences ; Water use ; Western Cape province , South Africa ; Ecosystems ; Evaporation ; Evapotranspiration ; Geologic models ; Heat flux ; Phase transitions ; Scintillation ; Soils ; Transpiration ; Water supply ; Forestry ; comparative study ; coniferous tree ; energy balance ; evapotranspiration ; invasive species ; numerical model ; riparian vegetation ; riparian zone ; sap flow ; Ecosystems ; Evaporation ; Forestry ; Soil ; Transpiration ; Water Supply ; South Africa ; Western Cape ; Pinus halepensis ; Pinus pinaster
英文摘要: Self-established stands of alien invasive pine trees are common in many parts of South Africa and elsewhere. They mainly invade non-riparian settings but sometimes invade riparian habitats. There are clear visual differences in the physical attributes of trees that occupy riparian and non-riparian zones. We have little information whether the differences between trees growing in these contrasting habitats reflect their water-use. The goal of this study was to establish the water-use of alien invasive pines growing adjacent to and away from a perennial stream, and to determine the driving factors behind the variations. The study was conducted in a self-established 20-year-old mixed pine forest occupied by roughly equal proportions of Pinus pinaster and Pinus halepensis. Individual tree transpiration rates were measured using the heat pulse velocity (HPV) sap flow method. Evapotranspiration (ET) from entire stands was determined from the surface energy balance equation using sensible heat flux data collected using a boundary layer scintillometer and measurements of the available energy (net radiation - soil heat flux). A simple two-layer model in which the stand ET was calculated as the algebraic sum of the outputs from transpiration (E) and soil evaporation sub-models was evaluated at the two contrasting sites. Annual transpiration and ET rates were higher in the riparian zone at 980 and 1417mm compared to 753 and 1190mm, respectively in the non-riparian area. The model predicted stand transpiration fairly accurately for both sites (average R2>0.75), but was less accurate for evapotranspiration (average R2<0.70) due to the difficulties in simulating soil evaporation. No significant differences in sap velocities were found between trees at the two sites so the greater water-use of trees in the riparian zone was due to the larger basal area per stem. Based on the measured transpiration data we conclude that self-sown pine stands growing in riparian zones use at least 36% more water than those occurring in non-riparian settings justifying the high priority given to clearing invasive trees in riparian zones. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66720
Appears in Collections:影响、适应和脆弱性

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作者单位: Council for Scientific and Industrial Research, Natural Resources and Environment, 11 Jan Cilliers Street, 7599 Stellenbosch, South Africa; Council for Scientific and Industrial Research, Natural Resources and Environment, C/o University of KwaZulu-Natal, Agricultural Faculty, Carbis Road, Scottsville 3201, Pietermaritzburg, South Africa

Recommended Citation:
Dzikiti S.,Schachtschneider K.,Naiken V.,et al. Comparison of water-use by alien invasive pine trees growing in riparian and non-riparian zones in the Western Cape Province, South Africa[J]. Forest Ecology and Management,2013-01-01,293
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