Elevational Effects of Climate Warming on Tree Growth in a Picea schrenkiana Forest in the Eastern Tianshan Mountains

Forests, Journal Year: 2024, Volume and Issue: 15(12), P. 2052 - 2052

Published: Nov. 21, 2024

Considerable uncertainty exists regarding the overall effects of future climate change on forests in arid mountains, and elevational range drought-induced tree growth decline remains unclear. Tianshan is largest mountain regions globally. Here, we analyzed ring data pure stands Schrenk spruce (Picea schrenkiana Fisch. et Mey.) Jiangbulake region eastern Mountains along an gradient (1800–2600 m a.s.l.). The radial P. trees declined three nine sample strips (1800–2100 a.s.l.) over last two decades. response (measured by width index, RWI) to temperature significantly changed at “inflection point” 2100–2200 m. RWI was negatively correlated with low elevations, whereas opposite observed high elevations. Precipitation minimum temperatures winter spring mean summer were main drivers growth, effect maximum concentrated spring. In addition warming study area since 1970s, (as measured basal increment, BAI) elevations below 2200 initially increased then decreased. Tree higher continues increase. Since 2000, average exceeded that BAI values have gradually approached each other recent decades, although lower exhibited past.

Language: Английский

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Satellite-Observed Spatio-Temporal Variation in Spring Leaf Phenology of Subtropical Forests across the Nanling Mountains in Southern China over 1999–2019

Forests, Journal Year: 2022, Volume and Issue: 13(9), P. 1486 - 1486

Published: Sept. 14, 2022

Knowledge of spatio-temporal variation in vegetation phenology is essential for understanding environmental change mountainous regions. In recent decades, satellite remote sensing has contributed to the across globe. However, subtropical mountains remains poorly understood, despite their important ecosystem functions and services. Here, we aim characterize pattern start growing season (SOS), a typical spring leaf phenological metric, forests Nanling Mountains (108–116° E, 24–27° N) southern China. SOS was estimated from time series GEOV2 area index (LAI) data at 1 km spatial resolution during period 1999–2019. We observed slightly earlier regional mean region (24–25° than those central northern also spatially varying elevation gradients SOS. The showed slope −0.2 days/year (p = 0.21) scale over addition, approximately 22% analyzed forested pixels experienced significantly < 0.1). Partial correlation analysis revealed that preseason air temperature most responsible climate factor controlling interannual this region. Furthermore, impacts on vary with forest types, mixed showing stronger between weaker winter evergreen broadleaf open forests. This suggests complication role regulating

Language: Английский

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Continued spring phenological advance under global warming hiatus over the Pan-Third Pole

Frontiers in Plant Science, Journal Year: 2022, Volume and Issue: 13

Published: Nov. 24, 2022

The global surface temperature has witnessed a warming hiatus in the first decade of this century, but how slowing down will impact spring phenology over Pan-Third Pole remains unclear. Here, we combined multiple satellite-derived vegetation indices with eddy covariance datasets to evaluate spatiotemporal changes phenological Pole. We found that continues advance at rate 4.8 days decade-1 during period, which is contrasted non-significant change northern hemisphere. Such significant and continued was mainly attributed an increase preseason minimum water availability. Moreover, there overall increasing importance precipitation on last four decades. further demonstrated increasingly negative correlation also across more than two-thirds dryland region, tentatively suggesting might shift from precipitation-controlled warmer world.

Language: Английский

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Climate variability and rangeland ecosystems

Elsevier eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 85 - 106

Published: Jan. 1, 2024

Language: Английский

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Interactive Effects of Temperature and Precipitation on Vegetation Activity Along Elevation Gradients in Alpine and Sub-Alpine Woodland of Southwest China

Published: Jan. 1, 2023

Elevation plays a pivotal role in changing hydroclimates, dominating vegetation activity and shaping distribution pattern alpine areas. However, little is known about the interactive effect of dominant drivers on along elevation gradients (EG). In this study, we explored spatio-temporal normalized difference index (NDVI) as proxy examined its interactions with temperature (T) precipitation (P) EG sub-alpine woodland Southwest China (ASWSC) during 2001-2018. We found that 24% ASWSC exhibit significant greening trend, responses to regional warming slightly wetting study period. The ratios browning areas total land increase below 4200 m decrease above m, while both change rates full EG. T-P antagonistic, except for an additive at elevations 2300-4200 m. antagonistic can be enhanced warm dry years, cold wet years. positive P increased conditions T Unlike deciduous broadleaved forest (DBF) mixed (MF) which showed EG, evergreen needleleaf (ENF) broadleaf (EBF) were insignificant P-T effect. Shrubland grassland types strong general, our results revealed varied effects different types, key ascertain how subalpine sustain future climate change.

Language: Английский

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Alternating Dominant Effects of Temperature and Precipitation on Vegetation Activity Along Elevation Gradients in the Alpine and Sub-Alpine Woodland of Southwest China

Published: Jan. 1, 2023

Elevation exerts a pivotal role in modulating hydroclimatic dynamics, exerting dominant influence on vegetation activity, and sculpting distribution patterns within alpine regions. Nevertheless, conspicuous knowledge gap persists regarding the alternating effects of environmental drivers activity along elevation gradients (EG). In this study, we investigated spatiotemporal Normalized Difference Vegetation Index (NDVI), employed as proxy for scrutinized its interactions with temperature (T) precipitation (P) EG Alpine Sub-alpine Woodlands Southwest China (ASWSC) during 2001-2018 period. Our findings illuminated that approximately 24% ASWSC's exhibited significant greening trend, response to regional warming slight increase study duration. Below 4200m elevation, observed an ratios areas exhibiting browning comparison total land area, whereas above 4200m, these decreased. Interestingly, both change rates decreased considered entire EG. Regarding between T P EG, antagonistic effect was predominant, except additive elevations 2300-4200m. This suggested that, overall, sub-alpine ecosystems were highly sensitive climate change, while section 2300-4200m appeared be most resilient change. The tended more pronounced warm dry years, prominent cold wet years. Specifically, positive increased conditions at below 4200m. Deciduous broadleaved forest (DBF) mixed (MF), which T-P On other hand, shrubland grassland types showed strong summary, our revealed range diverse （EG）. These deepen understanding responses contribute establishing scientific foundation effective ecosystem management conservation practices.

Language: Английский

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Changes in Vegetation Phenology and its Response to Different Layers of Soil Moisture in the Dry Zone of Central Asia, 1982–2022

Published: Jan. 1, 2023

Global temperature increase has resulted in increasingly frequent and intense droughts Central Asia is anticipated to profoundly impact vegetation growth ecosystem functionality this area. Vegetation phenology a pivotal biological indicator of response climate change. However, the effects multilayered soil moisture aridity on Asian have not been sufficiently investigated. Therefore, study examined intricacies based (SM) Standardized Soil Moisture Index (SSMI) data. The results indicated that from 1982 2022, arid region experienced an overall decrease SM SSMI. With increasing depth, regions with pronounced decline expanded, incidence events, as evaluated by SSMI, notably increased. Start Season (SOS) exhibited positive correlation springtime SM, prominent at depth 0–7 cm. End (EOS) spatial heterogeneity its summer influence 28–100 cm being prominent. EOS showed autumn showing particularly significant depths 7–28 Length (LOS) was negatively correlated spring, summer, SM. LOS notable In shallower layers (0–7, 7–28, cm), (SOS, EOS, LOS) heightened responsiveness short-term lasting for 1–3 months. deeper (100–289 sensitivity prolonged 12–24 findings contribute understanding phenology. This knowledge will aid formulation more precise water resource management strategies prediction future change terrestrial ecosystems.

Language: Английский

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