Moisture mediates temperature-growth couplings of high-elevation shrubs in the Tibetan plateau

Yang, Han; Wang, Ya-Feng; Liu, Bo; Huang, Ru; Camarero, J. Julio

doi:10.1007/s00468-021-02204-w

Cited by 11 publications

(3 citation statements)

References 51 publications

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“…Additionally, this negative effect could last the whole growing season. It is possible that a steady increase in summer temperature induced water stress [41] and reduced the accumulation of organic matter, thus depleting the water and nutrient available for shrubs [42]. Such a negative response of ring formation to high temperature was also founded in several timberline sites [36,43,44].…”

Section: Growth-limiting Factor For Rhododendron Przewalskii Shrubsmentioning

confidence: 99%

Inconsistent Growth Responses of Alpine Rhododendron Shrubs to Climate Change at Two Sites on the Eastern Tibetan Plateau

Wang

Camarero

2023

Forests

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Evidence is accumulating that the radial growth of high-elevation Rhododendron shrubs has high dendrochronological potential. However, it remains unclear if the growth responses of alpine Rhododendron shrubs to climate are contingent on site conditions. Herein, the climate–growth relationships of alpine Rhododendron przewalskii Maxim. shrubs were investigated at two sites (NQ, LWQ) at an elevation of 4300 m on the eastern Tibetan Plateau. We collected ring-width data from 53 Rhododendron shrubs. Well-replicated 111-year-old and 51-year-old long shrub ring-width chronologies were built for NQ and LWQ, respectively. Mean shrub growth did not differ between the two study sites. Mean maximum temperature in September of the previous year was significantly negatively correlated with shrub ring-width indices in site NQ, whereas the August minimum temperature of the current year showed a strong negative association with shrub growth indices in site LWQ. Random effects with the shrub level condition exerted a certain influence on shrub radial growth. Results of previous studies in other forest regions across the Tibetan Plateau, along with this study, revealed the diverse responses of radial growth of alpine Rhododendron shrubs to climate change. Thus, both climatic and local-scale variables should be considered when conducting shrub-based dendrochronological studies. A warmer and drier climate in the future could further reduce Rhododendron shrub growth in particular sites and threaten the survival of alpine shrub ecosystems on the eastern Tibetan Plateau.

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Section: Growth-limiting Factor For Rhododendron Przewalskii Shrubsmentioning

confidence: 99%

Inconsistent Growth Responses of Alpine Rhododendron Shrubs to Climate Change at Two Sites on the Eastern Tibetan Plateau

Wang

Camarero

2023

Forests

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“…Warmer temperatures and reduced precipitation associated with the persistent positive phase of the AAO in spring-summer [28,29] negatively influence the growth of N. betuloides forests in Navarino Island. Warmer and drier climatic conditions in recent decades have induce stomatal closure and the consequent decrease in the photosynthetic rate [57,58]. Hence, lower interannual biomass production is reflected in the N. betuloides RWIs.…”

Section: High Diversity Of Climatic Responses In Ssa Nothofagus Forestsmentioning

confidence: 99%

Two Nothofagus Species in Southernmost South America Are Recording Divergent Climate Signals

Soto-Rogel

Aravena

Villalba

et al. 2022

Forests

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Recent climatic trends, such as warming temperatures, decrease in rainfall, and extreme weather events (e.g., heatwaves), are negatively affecting the performance of forests. In northern Patagonia, such conditions have caused tree growth reduction, crown dieback, and massive die-back events. However, studies looking at these consequences in the southernmost temperate forest (Nothofagus betuloides and Nothofagus pumilio) are much scarcer, especially in southernmost South America (SSA). These forests are also under the influence of the positive phase of Antarctic Oscillation (AAO, also known as Southern Annular Mode, SAM) that has been associated with increasing trends in temperature, drought, and extreme events in the last decades. This study evaluated the growth patterns and the climatic response of eight new tree-ring chronologies from Nothofagus species located at the upper treeline along different environmental gradients in three study areas: Punta Arenas, Yendegaia National Park, and Navarino Island in SSA. The main modes of the ring-width index (RWI) variation were studied using principal component analysis (PCA). We found that PC1 has the higher loadings for sites with precipitation values over 600 mm/yr, PC2 with N. betuloides sites, and PC3 with higher loadings for sites with precipitation values below 600 mm/yr. Our best growth-climate relationships are between N. betuloides and AAO and the most northeastern site of N. pumilio with relative humidity (which coincides with heatwaves and extreme drought). The climatic signals imprinted in the southernmost forests are sensitive to climatic variability, the climate forcing AAO, and the effects of climate change in the last decades.

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“…The Qinghai–Tibet Plateau is a unique location comprising of different forest systems vulnerable to climate change at regional scale ( Han et al, 2021 ; Wang et al, 2021a , b ). Therefore, elucidating the shift of EMF communities and the influencing environmental factors in this Himalayan region is important for understanding future changes in its ecological services.…”

Section: Introductionmentioning

confidence: 99%

Soil nutrients and plant diversity affect ectomycorrhizal fungal community structure and functional traits across three subalpine coniferous forests

Yang

Hua²,

Zhang³

et al. 2022

Front. Microbiol.

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The symbiotic relationship between ectomycorrhizal fungi (EMF) and the roots of host plants is significantly important in regulating the health and stability of ecosystems, especially of those such as the climate warming affected subalpine forest ecosystems. Therefore, from the coniferous forest systems located in the Southern Qinghai-Tibetan Plateau, root tips from three forest tree species: Pinus wallichiana, Abies spectabilis and Picea spinulosa, were collected to look for the local causes of EMF community composition and diversity patterns. The EMF colonization rate, diversity and taxonomic community structure were determined by morphotyping and sanger sequencing of the fungal ITS gene from the root tip samples. Soil exploration types were identified based on the morphologies of the ectomycorrhizas, coupled with soil properties analysis and plant diversity survey. Contrasting patterns of EMF community and functional diversity were found across the studied three forests types dominated by different coniferous tree species. In terms of associations between soil and EMF properties, the total phosphorus (TP) and nitrate (NO3−) contents in soil negatively correlated with the colonization rate and the Shannon diversity index of EMF in contrast to the positive relationship between TP and EMF richness. The soil total nitrogen (TN), ammonium (NH4+) and plant diversity together caused 57.6% of the total variations in the EMF taxonomic community structure at the three investigated forest systems. Whereas based on the soil exploration types alone, NH4+ and TN explained 74.2% of variance in the EMF community structures. Overall, the findings of this study leverage our understanding of EMF dynamics and local influencing factors in coniferous forests dominated by different tree species within the subalpine climatic zone.

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Moisture mediates temperature-growth couplings of high-elevation shrubs in the Tibetan plateau

Cited by 11 publications

References 51 publications

Inconsistent Growth Responses of Alpine Rhododendron Shrubs to Climate Change at Two Sites on the Eastern Tibetan Plateau

Inconsistent Growth Responses of Alpine Rhododendron Shrubs to Climate Change at Two Sites on the Eastern Tibetan Plateau

Two Nothofagus Species in Southernmost South America Are Recording Divergent Climate Signals

Soil nutrients and plant diversity affect ectomycorrhizal fungal community structure and functional traits across three subalpine coniferous forests

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