Assessing the environmental controls on Scots pine transpiration and the implications for water partitioning in a boreal headwater catchment

Hailong Wang, Doerthe Tetzlaff, Jonathan J Dick, Chris Soulsby

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Abstract

Climate change projections indicate reduced summer precipitation and increased air temperature for the northern high latitudes. These climate changes are likely to alter forest water budgets of which plant transpiration (T) forms a significant component. Plant transpiration is regulated by stomata behavior of particular species, which is constrained by ambient air and soil conditions. Here, we measured sap flow in a Scots pine (Pinus Sylvestris) plantation in a low energy Scottish headwater catchment during the main summer growth period. Effects of rainfall on forest transpiration, as well as the response of T to four environmental variables were investigated at a daily scale. In this boreal environment, transpiration was mainly restricted by radiation and vapor pressure deficit. Air temperature was the least important controlling factor. Soil water became an important factor when rainfall was limited. Frequent but small rain events dictated that precipitation met short-term transpiration demand most of the time. The trees needed supplementary water from antecedent soil water stores when weekly rainfall was below ∼8 mm, but such periods were rare. Water exchange mainly occurred in the canopy or upper 10 cm of the soil, with 47% of rainfall transpired, 45% intercepted and <8% evaporated from the soil surface. Understanding interactions between forests and their hydroclimate, as well as the role of forests in water partitioning is crucial to assist a sustainable land and water management in a changing climate. Whilst such studies are common in semi-arid regions, they are limited in boreal zones, therefore, our findings are a valuable contribution to understanding plant-water relations in a changing environment.
Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalAgricultural and Forest Meteorology
Volume240-241
Early online date6 Apr 2017
DOIs
Publication statusPublished - 15 Jun 2017

Fingerprint

headwater
transpiration
Pinus sylvestris
partitioning
catchment
rain
rainfall
climate change
water
air temperature
soil water
plant water relations
plant-water relations
sap flow
summer
stomata
water exchange
vapor pressure
semiarid region
water management

Keywords

  • sap flow
  • evapotranspiration
  • climate
  • hydrology
  • water partition
  • Scots pine

Cite this

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title = "Assessing the environmental controls on Scots pine transpiration and the implications for water partitioning in a boreal headwater catchment",
abstract = "Climate change projections indicate reduced summer precipitation and increased air temperature for the northern high latitudes. These climate changes are likely to alter forest water budgets of which plant transpiration (T) forms a significant component. Plant transpiration is regulated by stomata behavior of particular species, which is constrained by ambient air and soil conditions. Here, we measured sap flow in a Scots pine (Pinus Sylvestris) plantation in a low energy Scottish headwater catchment during the main summer growth period. Effects of rainfall on forest transpiration, as well as the response of T to four environmental variables were investigated at a daily scale. In this boreal environment, transpiration was mainly restricted by radiation and vapor pressure deficit. Air temperature was the least important controlling factor. Soil water became an important factor when rainfall was limited. Frequent but small rain events dictated that precipitation met short-term transpiration demand most of the time. The trees needed supplementary water from antecedent soil water stores when weekly rainfall was below ∼8 mm, but such periods were rare. Water exchange mainly occurred in the canopy or upper 10 cm of the soil, with 47{\%} of rainfall transpired, 45{\%} intercepted and <8{\%} evaporated from the soil surface. Understanding interactions between forests and their hydroclimate, as well as the role of forests in water partitioning is crucial to assist a sustainable land and water management in a changing climate. Whilst such studies are common in semi-arid regions, they are limited in boreal zones, therefore, our findings are a valuable contribution to understanding plant-water relations in a changing environment.",
keywords = "sap flow, evapotranspiration, climate, hydrology, water partition, Scots pine",
author = "Hailong Wang and Doerthe Tetzlaff and Dick, {Jonathan J} and Chris Soulsby",
note = "We would like to thank The Leverhulme Trust (project PLATO, RPG-2014-016) and the European Research Council (ERC, project GA 335910 VeWa) for funding the projects in the catchment. We also want to thank two anonymous reviewers for providing valuable and constructive comments which substantially improved the paper.",
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T1 - Assessing the environmental controls on Scots pine transpiration and the implications for water partitioning in a boreal headwater catchment

AU - Wang, Hailong

AU - Tetzlaff, Doerthe

AU - Dick, Jonathan J

AU - Soulsby, Chris

N1 - We would like to thank The Leverhulme Trust (project PLATO, RPG-2014-016) and the European Research Council (ERC, project GA 335910 VeWa) for funding the projects in the catchment. We also want to thank two anonymous reviewers for providing valuable and constructive comments which substantially improved the paper.

PY - 2017/6/15

Y1 - 2017/6/15

N2 - Climate change projections indicate reduced summer precipitation and increased air temperature for the northern high latitudes. These climate changes are likely to alter forest water budgets of which plant transpiration (T) forms a significant component. Plant transpiration is regulated by stomata behavior of particular species, which is constrained by ambient air and soil conditions. Here, we measured sap flow in a Scots pine (Pinus Sylvestris) plantation in a low energy Scottish headwater catchment during the main summer growth period. Effects of rainfall on forest transpiration, as well as the response of T to four environmental variables were investigated at a daily scale. In this boreal environment, transpiration was mainly restricted by radiation and vapor pressure deficit. Air temperature was the least important controlling factor. Soil water became an important factor when rainfall was limited. Frequent but small rain events dictated that precipitation met short-term transpiration demand most of the time. The trees needed supplementary water from antecedent soil water stores when weekly rainfall was below ∼8 mm, but such periods were rare. Water exchange mainly occurred in the canopy or upper 10 cm of the soil, with 47% of rainfall transpired, 45% intercepted and <8% evaporated from the soil surface. Understanding interactions between forests and their hydroclimate, as well as the role of forests in water partitioning is crucial to assist a sustainable land and water management in a changing climate. Whilst such studies are common in semi-arid regions, they are limited in boreal zones, therefore, our findings are a valuable contribution to understanding plant-water relations in a changing environment.

AB - Climate change projections indicate reduced summer precipitation and increased air temperature for the northern high latitudes. These climate changes are likely to alter forest water budgets of which plant transpiration (T) forms a significant component. Plant transpiration is regulated by stomata behavior of particular species, which is constrained by ambient air and soil conditions. Here, we measured sap flow in a Scots pine (Pinus Sylvestris) plantation in a low energy Scottish headwater catchment during the main summer growth period. Effects of rainfall on forest transpiration, as well as the response of T to four environmental variables were investigated at a daily scale. In this boreal environment, transpiration was mainly restricted by radiation and vapor pressure deficit. Air temperature was the least important controlling factor. Soil water became an important factor when rainfall was limited. Frequent but small rain events dictated that precipitation met short-term transpiration demand most of the time. The trees needed supplementary water from antecedent soil water stores when weekly rainfall was below ∼8 mm, but such periods were rare. Water exchange mainly occurred in the canopy or upper 10 cm of the soil, with 47% of rainfall transpired, 45% intercepted and <8% evaporated from the soil surface. Understanding interactions between forests and their hydroclimate, as well as the role of forests in water partitioning is crucial to assist a sustainable land and water management in a changing climate. Whilst such studies are common in semi-arid regions, they are limited in boreal zones, therefore, our findings are a valuable contribution to understanding plant-water relations in a changing environment.

KW - sap flow

KW - evapotranspiration

KW - climate

KW - hydrology

KW - water partition

KW - Scots pine

U2 - 10.1016/j.agrformet.2017.04.002

DO - 10.1016/j.agrformet.2017.04.002

M3 - Article

VL - 240-241

SP - 58

EP - 66

JO - Agricultural and Forest Meteorology

JF - Agricultural and Forest Meteorology

SN - 0168-1923

ER -