Spruce trees have stronger drought sensitivity at low- than high-elevation sites across China’s aridity zones DOI Creative Commons
Guobao Xu, Tuo Chen,

Xiaohong Liu

et al.

Global Ecology and Conservation, Journal Year: 2024, Volume and Issue: 53, P. e03000 - e03000

Published: May 24, 2024

The ecological relationships between tree growth and climate factors are important for the adaptation, prediction, forest management of species against a background global warming. Yet how these drought-sensitive conifer trees changed affected by elevation remains unclear. To investigate effect on spruce growth–climate interactions, we collected total 1886 tree-ring cores (two per tree) from four species, including Picea crassifolia Kom., meyeri Rehd. et Wils., schrenkiana Fisch. Mey., wilsonii Mast., in 10 pure forests at pair high- low-elevation alpine sites with same slope across two aridity zones China. We then constructed 20 stand chronologies low- high-elevation sites. Overall, was more sensitive to drought variability semi-arid zone whereas it weakly limited semi-humid zone. Further, growing were temperature unlike stronger positive responses those In latter half 20th century, drought–growth enhanced both high low due warming increased intensity. Our dendrochronology-based findings suggest that trees' radial stands may have faced stress during three recent decades. Nevertheless, incurred compared first century.

Language: Английский

Decadal Changes in Population Structures of Rare Oak Species Quercus chungii DOI Creative Commons

Xueer Zhong,

Wenbin Li,

Zhenji Li

et al.

Ecology and Evolution, Journal Year: 2024, Volume and Issue: 14(10)

Published: Oct. 1, 2024

ABSTRACT Quercus chungii , a rare and endangered endemic tree species, is found exclusively in subtropical regions of China. Understanding the population structure temporal dynamics Q. pivotal for effective conservation restoration its populations associated ecosystems. However, large knowledge gaps remain about change key demographic rates across size classes. In this study, we investigated structures 2013 2023 nature reserve specifically established to better conserve species We that increased overall abundance past decade, suggesting active regeneration rapid growth rate effectiveness efforts. The age showed pyramid shape, with sharp decline numbers individuals from germinated seeds seedlings saplings. These led low saplings high age‐specific death probabilities at early developmental stages. results indicated potential risks future decline. may have already manifested over as mortality during seedling‐to‐sapling transition could be one primary reasons contributing decreased proportion compared 2013. propose studies benefit in‐depth on processes by considering seed predation germination under changing climate. This study improves prediction development thereby offering theoretical guidance essential conservation.

Language: Английский

Citations

1
Differences in hydrological niche and tree size explain growth resilience to drought in three Mediterranean oaks DOI
Álvaro Rubio‐Cuadrado, Fernando Montes, Marta Pardos

et al.

Agricultural and Forest Meteorology, Journal Year: 2024, Volume and Issue: 359, P. 110291 - 110291

Published: Nov. 1, 2024

Language: Английский

Citations

1
Precipitation change, functional traits and stand structure jointly control the spatiotemporal variability of radial growth in alpine treeline ecotones across northern China DOI
Xuemei Wang,

Penghong Liang,

Liping Li

et al.

Agricultural and Forest Meteorology, Journal Year: 2024, Volume and Issue: 350, P. 109992 - 109992

Published: March 30, 2024

Language: Английский

Citations

0
Stretched sapwood, ultra-widening permeability and ditching da Vinci: revising models of plant form and function DOI Creative Commons
Tommaso Anfodillo, Mark E. Olson

Annals of Botany, Journal Year: 2024, Volume and Issue: 134(1), P. 19 - 42

Published: April 18, 2024

Abstract Background The mechanisms leading to dieback and death of trees under drought remain unclear. To gain an understanding these mechanisms, addressing major empirical gaps regarding tree structure–function relations remains essential. Scope We give reasons think that a central factor shaping plant form function is selection simultaneously favouring constant leaf-specific conductance with height growth isometric (1:1) scaling between leaf area the volume metabolically active sink tissues (‘sapwood’). Sapwood volume–leaf isometry implies per-leaf sapwood volumes become transversely narrower growth; we call this ‘stretching’. Stretching means must favour increases in permeability above beyond afforded by tip-to-base conduit widening ("ultra-widening permeability"), via fewer wider vessels or tracheids larger pits margo openings. Leaf area–metabolically tissue would mean it unlikely die during because carbon starvation due greater sink–source relationships as compared shorter plants. Instead, increase most plausibly associated risk embolism, seems more probable explanation preferential vulnerability climate change-induced drought. Other implications construction maintenance costs are departure from da Vinci rule expectation similar areas across branching orders, extensive furcation stem unlikely. Conclusions Because all considerations impact likelihood hydraulic failure versus starvation, both implicated key suspects forest mortality, suggest predictions represent essential priorities for testing.

Language: Английский

Citations

0
Spruce trees have stronger drought sensitivity at low- than high-elevation sites across China’s aridity zones DOI Creative Commons
Guobao Xu, Tuo Chen,

Xiaohong Liu

et al.

Global Ecology and Conservation, Journal Year: 2024, Volume and Issue: 53, P. e03000 - e03000

Published: May 24, 2024

The ecological relationships between tree growth and climate factors are important for the adaptation, prediction, forest management of species against a background global warming. Yet how these drought-sensitive conifer trees changed affected by elevation remains unclear. To investigate effect on spruce growth–climate interactions, we collected total 1886 tree-ring cores (two per tree) from four species, including Picea crassifolia Kom., meyeri Rehd. et Wils., schrenkiana Fisch. Mey., wilsonii Mast., in 10 pure forests at pair high- low-elevation alpine sites with same slope across two aridity zones China. We then constructed 20 stand chronologies low- high-elevation sites. Overall, was more sensitive to drought variability semi-arid zone whereas it weakly limited semi-humid zone. Further, growing were temperature unlike stronger positive responses those In latter half 20th century, drought–growth enhanced both high low due warming increased intensity. Our dendrochronology-based findings suggest that trees' radial stands may have faced stress during three recent decades. Nevertheless, incurred compared first century.

Language: Английский

Citations

0