Scaling-up method for stand water consumption of Quercus variabilis water conservation forest |
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| Authors: | Huatian Wang Lifeng Xing Lüyi Ma Pengsen Sun |
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| Institution: | (1) Forestry College, Shandong Agricultural University, Tai’an, 271018, China;(2) College of Resources and Environment, Beijing Forestry University, Beijing, 100083, China;(3) Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing, 100091, China |
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| Abstract: | Single tree’s sapwood scattering style and diurnal water consumption rhythm for different diameter classes were studied in
a 48-year-old Quercus variabilis stand, water protection forest in Beijing. Results showed that the tree’s sapwood area was closely related to diameter at
breast height (DBH). Single tree’s daily water consumption ascended as DBH and sapwood area increased. Daily water consumption
of different diameter classes in September ascended steeply in the early morning and reached the peak around 11:00, and then
descended slowly to the valley at 18:00. The course of daily accumulated water consumption was in accordance with a typical
Richards model (R=0.985,8). Parameters of diameter-time equation for scaling-up can be achieved by parameter-recovering method in the gradient
of all diameter classes and at any time of a day, characteristic parameters of the course of daily stand water consumption
were calculated from a modulated Richards equation derivative: .
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Translated from Scientia Silvae Sinicae, 2004, 40(6): 170–175 译自: 林业科学, 2004, 40(6): 170–175] |
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| Keywords: | Quercus variabilis water conservation forest stand (trees) water consumption scaling-up Richard’ s model forest land water balance |
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