Tree water dynamics in a drying and warming world [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 551 Geology, hydrology, meteorology

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2017

Mô tả vật lý: Size: 1861-1873 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 260502

 Disentangling the relative impacts of precipitation reduction and vapour pressure deficit (<
 i>
 VPD<
 /i>
 ) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge. Here, we report sap flux density (<
 i>
 F<
 sub>
 D<
 /sub>
 <
 /i>
 ), stomatal conductance (<
 i>
 G<
 sub>
 s<
 /sub>
 <
 /i>
 ), hydraulic conductivity (<
 i>
 K<
 sub>
 L<
 /sub>
 <
 /i>
 ) and xylem anatomy in pi�on pine (<
 i>
 Pinus edulis<
 /i>
 ) and juniper (<
 i>
 Juniperus monosperma<
 /i>
 ) trees subjected to five years of precipitation reduction, atmospheric warming (elevated <
 i>
 VPD<
 /i>
 ) and their combined effects. No acclimation occurred under precipitation reduction: lower <
 i>
 G<
 sub>
 s<
 /sub>
 <
 /i>
  and <
 i>
 F<
 sub>
 D<
 /sub>
 <
 /i>
  were found for both species compared to ambient conditions. Warming reduced the sensibility of stomata to <
 i>
 VPD<
 /i>
  for both species but resulted in the maintenance of <
 i>
 G<
 sub>
 s<
 /sub>
 <
 /i>
  and <
 i>
 F<
 sub>
 D<
 /sub>
 <
 /i>
  to ambient levels only for pi�on. For juniper, reduced soil moisture under warming negated benefits of stomatal adjustments and resulted in reduced <
 i>
 F<
 sub>
 D<
 /sub>
 <
 /i>
 , <
 i>
 G<
 sub>
 s<
 /sub>
 <
 /i>
  and <
 i>
 K<
 sub>
 L<
 /sub>
 <
 /i>
 . Although reduced stomatal sensitivity to VPD also occurred under combined stresses, reductions in <
 i>
 G<
 sub>
 s<
 /sub>
 <
 /i>
 , <
 i>
 F<
 sub>
 D<
 /sub>
 <
 /i>
  and <
 i>
 K<
 sub>
 L<
 /sub>
 <
 /i>
  took place to similar levels as under single stresses for both species. Here our results show that stomatal conductance adjustments to high <
 i>
 VPD<
 /i>
  could minimize but not entirely prevent additive effects of warming and drying on water use and carbon acquisition of trees in semi-arid regions.
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