Sapflow characteristics and climatic responses in three forest species in the semiarid Loess Plateau region of China

Sheng Du, Yi Long Wang, Tomonori Kume, Jian Guo Zhang, Kyoichi Otsuki, Norikazu Yamanaka, Guo Bin Liu

研究成果: ジャーナルへの寄稿記事

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In the semiarid Loess Plateau region of China, ecosystems are frequently affected by water shortages. Late spring and early summer are periods when forest communities tend to suffer from soil drought. To clarify the water-use strategies of the main species in this area, the xylem sap flow of trees from three species in the field was monitored for three successive periods in summer using Granier-type thermal dissipation probes. Vapor pressure deficit (VPD), solar radiation (Rs) and soil moisture had varying influences on sap flux density (Fd) in the species. Normalized Fd values could be fitted to VPD using an exponential saturation function, but the fit was better with a derived variable of transpiration (VT), an integrated index calculated from VPD and Rs. From differences in model coefficients, the species were roughly divided into two types with contrasting drought sensitivity. The exotic Robinia pseudoacacia was defined as drought-sensitive type. It showed higher sapflow increases in response to rainfall, suggesting a high water demand and high influence of soil water conditions on transpiration. This species showed relatively late stomatal response to increasing VPD. The wide-peak pattern of diurnal sapflow course also suggests relatively low stomatal regulation in this species. The drought-insensitive type consisted of the naturally dominant Quercus liaotungensis and an indigenous concomitant species, Armeniaca sibirica, in the forest. The sap flow of these species was not very sensitive to changes in soil water conditions. The results suggest that typical indigenous species can manage the water consumption conservatively under both drought and wet conditions. Variations in water use strategies within indigenous species are also detected.

元の言語英語
ページ(範囲)1-10
ページ数10
ジャーナルAgricultural and Forest Meteorology
151
発行部数1
DOI
出版物ステータス出版済み - 1 15 2011

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All Science Journal Classification (ASJC) codes

  • Forestry
  • Global and Planetary Change
  • Agronomy and Crop Science
  • Atmospheric Science

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