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The effect of rainf...
The effect of rainfall amount and timing on annual transpiration in a grazed savanna grassland
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- Räsänen, Matti (author)
- University of Helsinki
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- Aurela, Mika (author)
- Finnish Meteorological Institute
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- Vakkari, Ville (author)
- Finnish Meteorological Institute,North-West University
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- Beukes, Johan P. (author)
- North-West University
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- Tuovinen, Juha Pekka (author)
- Finnish Meteorological Institute
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- Van Zyl, Pieter G. (author)
- North-West University
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- Josipovic, Miroslav (author)
- North-West University
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- Siebert, Stefan J. (author)
- North-West University
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- Laurila, Tuomas (author)
- Finnish Meteorological Institute
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- Kulmala, Markku (author)
- University of Helsinki
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- Laakso, Lauri (author)
- Finnish Meteorological Institute,North-West University
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- Rinne, Janne (author)
- Lund University,Lunds universitet,BECC: Biodiversity and Ecosystem services in a Changing Climate,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Institutionen för naturgeografi och ekosystemvetenskap,Centre for Environmental and Climate Science (CEC),Faculty of Science,Dept of Physical Geography and Ecosystem Science
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- Oren, Ram (author)
- Duke University,University of Helsinki
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- Katul, Gabriel (author)
- Duke University
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(creator_code:org_t)
- 2022-11-16
- 2022
- English 19 s.
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In: Hydrology and Earth System Sciences. - : Copernicus GmbH. - 1027-5606 .- 1607-7938. ; 26:22, s. 5773-5791
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Abstract
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- The role of precipitation (P) variability with respect to evapotranspiration (ET) and its two components, transpiration (T) and evaporation (E), from savannas continues to draw significant research interest given its relevance to a number of ecohydrological applications. Our study reports on 6 years of measured ET and estimated T and E from a grazed savanna grassland at Welgegund, South Africa. Annual P varied significantly with respect to amount (508 to 672 mm yr-1), with dry years characterized by infrequent early-season rainfall. T was determined using annual water-use efficiency and gross primary production estimates derived from eddy-covariance measurements of latent heat flux and net ecosystem CO2 exchange rates. The computed annual T for the 4 wet years with frequent early wet-season rainfall was nearly constant, 326±19 mm yr-1 (T/ET=0.51), but was lower and more variable between the 2 dry years (255 and 154 mm yr-1, respectively). Annual T and T/ET were linearly related to the early wet-season storm frequency. The constancy of annual T during wet years is explained by the moderate water stress of C4 grasses as well as trees' ability to use water from deeper layers. During extreme drought, grasses respond to water availability with a dieback-regrowth pattern, reducing leaf area and transpiration and, thus, increasing the proportion of transpiration contributed by trees. The works suggest that the early-season P distribution explains the interannual variability in T, which should be considered when managing grazing and fodder production in these grasslands.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Naturgeografi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Physical Geography (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Räsänen, Matti
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Aurela, Mika
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Vakkari, Ville
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Beukes, Johan P.
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Tuovinen, Juha P ...
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Van Zyl, Pieter ...
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show more...
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Josipovic, Miros ...
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Siebert, Stefan ...
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Laurila, Tuomas
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Kulmala, Markku
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Laakso, Lauri
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Rinne, Janne
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Oren, Ram
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Katul, Gabriel
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Physical Geograp ...
- Articles in the publication
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Hydrology and Ea ...
- By the university
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Lund University