Canopy transpiration of a Larix sibirica and Pinus sylvestris forest in Central Siberia

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F19%3A43915559" target="_blank" >RIV/62156489:43410/19:43915559 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.agrformet.2019.02.038" target="_blank" >https://doi.org/10.1016/j.agrformet.2019.02.038</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.agrformet.2019.02.038" target="_blank" >10.1016/j.agrformet.2019.02.038</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Canopy transpiration of a Larix sibirica and Pinus sylvestris forest in Central Siberia

Popis výsledku v původním jazyce

Russian boreal forests represent the largest forested region on Earth and comprise one-fifth of the world&apos;s forest cover. The two most common genera in Siberia are Larix and Pinus, which together cover more than 80% of the region&apos;s forested area. One observable ongoing effect of climate warming is that natural populations of Siberian larch are gradually being replaced by Scots pine. The present work focuses on comparing effects of environmental variables on sap flow density in two even-aged stands of Larix sibirica and Pinus sylvestris. While the two study stands were identical in age (49 years) with similar basal areas and leaf area index, they exhibited very different transpiration rates and response mechanisms to environmental signals. Stand water use was higher for larch than it was for pine, even though transpiration for deciduous larch trees occurred over shorter time periods. The cumulative annual transpiration of the larch stand was 284 +- 4 mm measured over two consecutive growing seasons (2015-2016), while for pine this was 20% lower. Seasonal transpiration accounted for 50% and 40% of the reference evapotranspiration and 91% and 67% of growing season precipitation for larch and pine, respectively. Water stored in soil provided an important source of water for transpiration, observed as roughly 100 mm, which was then replenished from snowmelt the following spring. The greatest difference between two species related to how well they controlled transpiration, notably in the context of high vapor pressure deficit; under these conditions, pine maintained greater control over transpiration than larch. For all soil moisture levels measured, larch transpired more water than pine. Importantly, our results point to potential future effects of global warming, most notably an increasing decline of larch forests, changes in the ratio between latent and sensitive heat fluxes, and significant modifications in ecosystem water availability.

Název v anglickém jazyce

Canopy transpiration of a Larix sibirica and Pinus sylvestris forest in Central Siberia

Popis výsledku anglicky

Russian boreal forests represent the largest forested region on Earth and comprise one-fifth of the world&apos;s forest cover. The two most common genera in Siberia are Larix and Pinus, which together cover more than 80% of the region&apos;s forested area. One observable ongoing effect of climate warming is that natural populations of Siberian larch are gradually being replaced by Scots pine. The present work focuses on comparing effects of environmental variables on sap flow density in two even-aged stands of Larix sibirica and Pinus sylvestris. While the two study stands were identical in age (49 years) with similar basal areas and leaf area index, they exhibited very different transpiration rates and response mechanisms to environmental signals. Stand water use was higher for larch than it was for pine, even though transpiration for deciduous larch trees occurred over shorter time periods. The cumulative annual transpiration of the larch stand was 284 +- 4 mm measured over two consecutive growing seasons (2015-2016), while for pine this was 20% lower. Seasonal transpiration accounted for 50% and 40% of the reference evapotranspiration and 91% and 67% of growing season precipitation for larch and pine, respectively. Water stored in soil provided an important source of water for transpiration, observed as roughly 100 mm, which was then replenished from snowmelt the following spring. The greatest difference between two species related to how well they controlled transpiration, notably in the context of high vapor pressure deficit; under these conditions, pine maintained greater control over transpiration than larch. For all soil moisture levels measured, larch transpired more water than pine. Importantly, our results point to potential future effects of global warming, most notably an increasing decline of larch forests, changes in the ratio between latent and sensitive heat fluxes, and significant modifications in ecosystem water availability.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

40102 - Forestry

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Agricultural and Forest Meteorology

ISSN

0168-1923

e-ISSN

—

Svazek periodika

271

Číslo periodika v rámci svazku

15 June

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

9

Strana od-do

64-72

Kód UT WoS článku

000468709200007

EID výsledku v databázi Scopus

2-s2.0-85062303524