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The Calibration and Use of Capacitance Sensors to Monitor Stem Water Content in Trees
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How significant is nocturnal sap flow?

Michael A Forster1

  • 1ICT International, Armidale, New South Wales, Australia School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Queensland, Australia michael@ictinternational.com.

Tree Physiology
|July 4, 2014
PubMed
Summary
This summary is machine-generated.

Nocturnal sap flow (Qn) is a significant part of total daily sap flow (Q), averaging 12.03%. This phenomenon varies by season, biome, and measurement method, requiring careful consideration in plant water transport studies.

Keywords:
atmospheric evaporative demandbiomehydraulic redistributionnight-timenocturnal transpirationvapour pressure deficit

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Area of Science:

  • Plant Physiology
  • Ecology
  • Hydrology

Background:

  • Nocturnal sap flow (Qn) is observed across diverse plant taxa, seasons, and biomes.
  • A general understanding of Qn's magnitude and its contribution to total daily sap flow (Q) is lacking.
  • The significance of Qn requires careful consideration in sap flow and related ecological studies.

Purpose of the Study:

  • To synthesize existing literature and unpublished data on nocturnal sap flow (Qn).
  • To quantify the proportion of total daily sap flow contributed by Qn (%Qn) across various factors.
  • To compare %Qn across different seasons, biomes, phylogenetic groups, and sap flow measurement methods.

Main Methods:

  • Literature synthesis and analysis of unpublished data.
  • Statistical analysis of %Qn from 98 species.
  • Comparison of %Qn based on season, biome, phylogenetic group, and thermometric sap flow methods (Heat Ratio Method - HRM, Thermal Dissipation Method - TDP, Heat Balance Method).

Main Results:

  • Average %Qn across all analysed species was 12.03%, with a highest average dataset of 69.00%.
  • %Qn was significantly lower in winter compared to other temperate seasons, and lower in the wet season than the dry season.
  • Equatorial and tropical biomes showed significantly higher %Qn than warm temperate and nemoral biomes. HRM and TDP methods yielded higher %Qn than the heat balance method, with HRM showing higher %Qn in winter and wet seasons.

Conclusions:

  • Nocturnal sap flow (Qn) is a widespread and significant component of total daily sap flow (Q).
  • The proportion of Qn varies significantly with season, biome, and the thermometric method used.
  • Future sap flow studies must account for Qn to accurately assess plant water use and transport.