Arid
DOI10.1007/s11104-007-9349-7
The response of sap flow to pulses of rain in a temperate Australian woodland
Zeppel, Melanie1,2; Macinnis-Ng, Catriona M. O.1,2; Ford, Chelcy R.3; Eamus, Derek1,2
通讯作者Zeppel, Melanie
来源期刊PLANT AND SOIL
ISSN0032-079X
EISSN1573-5036
出版年2008
卷号305期号:1-2页码:121-130
英文摘要

In water-limited systems, pulses of rainfall can trigger a cascade of plant physiological responses. However, the timing and size of the physiological response can vary depending on plant and environmental characteristics, such as rooting depth, plant size, rainfall amount, or antecedent soil moisture. We investigated the influence of pulses of rainfall on the response of sap flow of two dominant evergreen tree species, Eucalyptus crebra (a broadleaf) and Callitris glaucophylla (a needle leaved tree), in a remnant open woodland in eastern Australia. Sap flow data were collected using heat-pulse sensors installed in six trees of each species over a 2 year period which encompassed the tail-end of a widespread drought. Our objectives were to estimate the magnitude that a rainfall pulse had to exceed to increase tree water use (i.e., define the threshold response), and to determine how tree and environmental factors influenced the increase in tree water use following a rainfall pulse. We used data filtering techniques to isolate rainfall pulses, and analysed the resulting data with multivariate statistical analysis. We found that rainfall pulses less than 20 mm did not significantly increase tree water use (P > 0.05). Using partial regression analysis to hold all other variables constant, we determined that the size of the rain event (P<0.05, R-2 = 0.59), antecedent soil moisture (P<0.05, R-2 = 0.29), and tree size (DBH, cm, P<0.05, R-2 = 0.15), all significantly affected the response to rainfall. Our results suggest that the conceptual Threshold-Delay model describing physiological responses to rainfall pulses could be modified to include these factors. We further conclude that modelling of stand water use over an annual cycle could be improved by incorporating the T-D behaviour of tree transpiration.


英文关键词rain pulses sap flow soil moisture threshold-delay model transpiration rate
类型Article
语种英语
国家Australia ; USA
收录类别SCI-E
WOS记录号WOS:000254205100011
WOS关键词PRECIPITATION PULSES ; SUMMER RAIN ; SEMIARID GRASSLAND ; COLORADO PLATEAU ; DESERT ECOSYSTEM ; RESOURCE PULSES ; PLANT-RESPONSES ; WATER ; TRANSPIRATION ; DROUGHT
WOS类目Agronomy ; Plant Sciences ; Soil Science
WOS研究方向Agriculture ; Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/158837
作者单位1.Univ Technol Sydney, Inst Water & Environm Resource Management, Sydney, NSW 2007, Australia;
2.Univ Technol Sydney, Dept Environm Sci, Sydney, NSW 2007, Australia;
3.USDA, US Forest Serv, SRS Coweeta Hydrol Lab, Otto, NC 28763 USA
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GB/T 7714
Zeppel, Melanie,Macinnis-Ng, Catriona M. O.,Ford, Chelcy R.,et al. The response of sap flow to pulses of rain in a temperate Australian woodland[J],2008,305(1-2):121-130.
APA Zeppel, Melanie,Macinnis-Ng, Catriona M. O.,Ford, Chelcy R.,&Eamus, Derek.(2008).The response of sap flow to pulses of rain in a temperate Australian woodland.PLANT AND SOIL,305(1-2),121-130.
MLA Zeppel, Melanie,et al."The response of sap flow to pulses of rain in a temperate Australian woodland".PLANT AND SOIL 305.1-2(2008):121-130.
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