Impact of Recent Climate Change on Water-Use Efficiency Strategies of Larix sibirica in the Altai-Sayan Mountain Range

Forests

RolfT. W. Siegwolf¹  Matthias Saurer¹  MarinaV. Fonti²  OlgaV. Churakova (Sidorova)²  VladimirS. Myglan³ 

[1] Forest Dynamics, Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland;Laboratory of Ecosystems Biogeochemistry, Institute of Ecology and Geography, Siberian Federal University, Svobodniy pr. 79, 660041 Krasnoyarsk, Russia;Siberian Dendrochronology Laboratory, Institute of Humanities, Siberian Federal University, Svobodniy pr. 79, 660041 Krasnoyarsk, Russia;

关键词: iWUE;    drought;    permafrost;    temperature;    vapor pressure deficit;    precipitation;   

DOI  :  10.3390/f11101103

来源: DOAJ

【 摘 要 】

A strong increase in the mean annual air temperature during the past 50 years by up to 0.54 °C was recorded in the Altai region (45°–52° N; 84°–99° E) compared to the global value of 0.07 °C over the period 1901–2008. The impact of the climatic changes on the hydrology are complex in these mountainous forest ecosystems and not fully understood. We aim to reveal differences in the intrinsic water-use efficiencies (iWUE) strategy by larch (Larix sibirica Ledeb.) derived from stable carbon isotopes at contrasting sites, ranging from the steppe (Ersin, Chadan) to high-elevation (Mongun, Koksu) sites of the Altai over the past century. The iWUE trends increased rapidly for all study sites except Chadan, where a decreasing trend after 2010 has been observed. This decline can be related to increased amount of precipitation compared to increased drought at the other sites. In general, the iWUE is increased up to 14% (1985–2019 compared to 1919–1984), which is lower compared to other studies across the globe likely due to harsh climatic conditions. Vapor pressure deficit and maximal air temperature are impacting Siberian larch significantly and affecting their iWUE differently at the high-elevated and steppe sites of the Altai over the past century.

【 授权许可】

Unknown