Sink limitation of plant growth determines tree line in the arid Himalayas

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F19%3A00511297" target="_blank" >RIV/60077344:_____/19:00511297 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985939:_____/19:00511297 RIV/60460709:41320/19:80743 RIV/60076658:12310/19:43899114

Výsledek na webu

<a href="http://hdl.handle.net/11104/0301602" target="_blank" >http://hdl.handle.net/11104/0301602</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1111/1365-2435.13284" target="_blank" >10.1111/1365-2435.13284</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sink limitation of plant growth determines tree line in the arid Himalayas

Popis výsledku v původním jazyce

Understanding what determines the high elevation limits of trees is crucial for predicting how tree lines may shift in response to climate change. Tree line formation is commonly explained by a low‐temperature restriction of meristematic activity (sink limitation) rather than carbon assimilation (source limitation). In arid mountains, however, trees face simultaneously low temperature and drought, both potentially restricting their growth and thus setting range limits. However, the mechanisms of tree line formation in high arid mountains are largely unknown. We studied Myricaria elegans, one of the world’s highest growing winter‐deciduous woody species, endemic to the arid Himalayas. We hypothesized that the upper elevation limit of Myricaria is associated with low temperatures during the early growing season affecting earlywood formation, while later in the season drought is constraining earlywood maturation and latewood formation. To test this hypothesis, we studied the quantitative anatomy of tree rings at different developmental stages across the entire species elevation range (3,200–4,400 m). We also explored daily stem increment and rehydration rates, seasonal dynamics of non‐structural carbohydrates and stable C isotopes as a proxy for possible drought constraints. Both earlywood and latewood increments decreased towards the tree line, whilenNSC in leaves, twigs and stem sapwood did not change, indicating a sink limitation as a main driver of the tree line. At tree line, low temperatures restricted earlywood formation more than latewood formation. Tree line individuals had—compared to individuals from lower elevations—smaller and fewer earlywood vessels, frequent frost rings and shorter periods with positive daily increments, but comparable night‐time stem rehydration rates and latewood density. All these results suggest a sink limitation as a main mechanism behind the tree line formation in high arid mountains.

Název v anglickém jazyce

Sink limitation of plant growth determines tree line in the arid Himalayas

Popis výsledku anglicky

Understanding what determines the high elevation limits of trees is crucial for predicting how tree lines may shift in response to climate change. Tree line formation is commonly explained by a low‐temperature restriction of meristematic activity (sink limitation) rather than carbon assimilation (source limitation). In arid mountains, however, trees face simultaneously low temperature and drought, both potentially restricting their growth and thus setting range limits. However, the mechanisms of tree line formation in high arid mountains are largely unknown. We studied Myricaria elegans, one of the world’s highest growing winter‐deciduous woody species, endemic to the arid Himalayas. We hypothesized that the upper elevation limit of Myricaria is associated with low temperatures during the early growing season affecting earlywood formation, while later in the season drought is constraining earlywood maturation and latewood formation. To test this hypothesis, we studied the quantitative anatomy of tree rings at different developmental stages across the entire species elevation range (3,200–4,400 m). We also explored daily stem increment and rehydration rates, seasonal dynamics of non‐structural carbohydrates and stable C isotopes as a proxy for possible drought constraints. Both earlywood and latewood increments decreased towards the tree line, whilenNSC in leaves, twigs and stem sapwood did not change, indicating a sink limitation as a main driver of the tree line. At tree line, low temperatures restricted earlywood formation more than latewood formation. Tree line individuals had—compared to individuals from lower elevations—smaller and fewer earlywood vessels, frequent frost rings and shorter periods with positive daily increments, but comparable night‐time stem rehydration rates and latewood density. All these results suggest a sink limitation as a main mechanism behind the tree line formation in high arid mountains.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10602 - Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology

Projekt

<a href="/cs/project/GA17-19376S" target="_blank" >GA17-19376S: Ekologické a evoluční odpovědi rostlin na klimatické změny: analýza růstových změn napříč ekosystémy a evolučními liniemi</a><br>

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

Functional Ecology

ISSN

0269-8463

e-ISSN

—

Svazek periodika

33

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

553-565

Kód UT WoS článku

000466375600002

EID výsledku v databázi Scopus

2-s2.0-85061257957