Summer Temperature Drives Radial Growth of Alpine Shrub Willows on the Northeastern Tibetan Plateau

Lu, Xiaoming; Huang, Ru; Wang, Yafeng; Sigdel, Shalik Ram; Dawadi, Binod; Liang, Eryuan; Camarero, J. Julio

doi:10.1657/aaar0015-069

Cited by 17 publications

(17 citation statements)

References 41 publications

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“…First, the impacts of higher growing season temperature on vegetation growth are regulated by precipitation on the Tibetan Plateau. Low precipitation may weaken the positive impact of temperature, and continuous low water availability may even depress growth (Cong et al., ; Liang, Shao, & Xu, ; Liang et al., ; Lu et al., ; Shen, Piao, Cong et al., ; Shen, Piao, Jeong et al., ; Zhong, Ma, Salama, & Su, ). Warming‐enhanced evaporation may affect water availability (Gao, Li, Leung, Chen, & Xu, ).…”

Section: Discussionmentioning

confidence: 99%

“…First, the impacts of higher growing season temperature on vegetation growth are regulated by precipitation on the Tibetan Plateau. Low precipitation may weaken the positive impact of temperature, and continuous low water availability may even depress growth (Cong et al, 2017;Liang, Shao, & Xu, 2009;Liang et al, 2012;Lu et al, 2018; enhanced evaporation may affect water availability (Gao, Li, Leung, Chen, & Xu, 2015). Meanwhile, the degradation of permafrost induced by warming may also reduce soil water availability by deepening the active layer and thus enhancing the loss of soil water (Jin et al, 2009;Qin et al, 2017;Yi, Wang, Qin, Xiang, & Ding, 2014).…”

Section: Variability In Vertical Movements Of Ndvi Gs Isolines In Rmentioning

confidence: 99%

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Mismatch in elevational shifts between satellite observed vegetation greenness and temperature isolines during 2000–2016 on the Tibetan Plateau

Zhu

Shen

et al. 2018

Global Change Biology

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Climate warming on the Tibetan Plateau tends to induce an uphill shift of temperature isolines. Observations and process-based models have both shown that climate warming has resulted in an increase in vegetation greenness on the Tibetan Plateau in recent decades. However, it is unclear whether the uphill shift of temperature isolines has caused greenness isolines to shift upward and whether the two shifts match each other. Our analysis of satellite observed vegetation greenness during the growing season (May-Sep) and gridded climate data for 2000-2016 documented a substantial mismatch between the elevational shifts of greenness and temperature isolines. This mismatch is probably associated with a lagging response of greenness to temperature change and with the elevational gradient of greenness. The lagging response of greenness may be associated with water limitation, resources availability, and acclimation. This lag may weaken carbon sequestration by Tibetan ecosystems, given that greenness is closely related to primary carbon uptake and ecosystem respiration increases exponentially with temperature. We also found that differences in terrain slope angle accounted for large spatial variations in the elevational gradient of greenness and thus the velocity of elevational shifts of greenness isolines and the sensitivity of elevational shifts of greenness isolines to temperature, highlighting the role of terrain effects on the elevational shifts of greenness isolines. The mismatches and the terrain effect found in this study suggest that there is potentially large micro-topographical difference in response and acclimation/adaptation of greenness to temperature changes in plants. More widespread in situ measurements and fine-resolution remote sensing observations and fine-gridded climate data are required to attribute the mismatch to specific environmental drivers and ecological processes such as vertical changes in community structure, plant physiology, and distribution of species.

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Section: Discussionmentioning

confidence: 99%

“…First, the impacts of higher growing season temperature on vegetation growth are regulated by precipitation on the Tibetan Plateau. Low precipitation may weaken the positive impact of temperature, and continuous low water availability may even depress growth (Cong et al, 2017;Liang, Shao, & Xu, 2009;Liang et al, 2012;Lu et al, 2018; enhanced evaporation may affect water availability (Gao, Li, Leung, Chen, & Xu, 2015). Meanwhile, the degradation of permafrost induced by warming may also reduce soil water availability by deepening the active layer and thus enhancing the loss of soil water (Jin et al, 2009;Qin et al, 2017;Yi, Wang, Qin, Xiang, & Ding, 2014).…”

Section: Variability In Vertical Movements Of Ndvi Gs Isolines In Rmentioning

confidence: 99%

Mismatch in elevational shifts between satellite observed vegetation greenness and temperature isolines during 2000–2016 on the Tibetan Plateau

Zhu

Shen

et al. 2018

Global Change Biology

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“…Most treeline sites were obtained from previous studies [12,18,28]. Some sites were investigated by our team in the past three years.…”

Section: Study Sites and Environmental Factorsmentioning

confidence: 99%

The Coupling of Treeline Elevation and Temperature is Mediated by Non-Thermal Factors on the Tibetan Plateau

Wang

Liang²,

Sigdel³

et al. 2017

Forests

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Abstract:Little is known about the relationships between treeline elevation and climate at regional and local scales. It is compelling to fill this research gap with data from the Tibetan Plateau where some of the highest alpine treelines in the world are found. This research question partially results from the lack of in situ temperature data at treeline sites. Herein, treeline variables (e.g., elevation, topography, tree species) and temperature data were collected from published investigations performed during this decade on the Tibetan Plateau. Temperature conditions near treeline sites were estimated using global databases and these estimates were corrected by using in situ air temperature measurements. Correlation analyses and generalized linear models were used to evaluate the effects of different variables on treeline elevation including thermal (growing-season air temperatures) and non-thermal (latitude, longitude, elevation, tree species, precipitation, radiation) factors. The commonality analysis model was applied to explore how several variables (July mean temperature, elevation of mountain peak, latitude) were related to treeline elevation. July mean temperature was the most significant predictor of treeline elevation, explaining 55% of the variance in treeline elevation across the Tibetan Plateau, whereas latitude, tree species, and mountain elevation (mass-elevation effect) explained 30% of the variance in treeline elevation. After considering the multicollinearity among predictors, July mean temperature (largely due to the influence of minimum temperature) still showed the strongest association with treeline elevation. We conclude that the coupling of treeline elevation and July temperature at a regional scale is modulated by non-thermal factors probably acting at local scales. Our results contribute towards explaining the decoupling between climate warming and treeline dynamics.

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“…+34 976 716031, fax +34 976 716019, e-mail: jjcamarero@ipe.csic.es plants is mainly constrained by decreasing temperatures upwards (K€ orner, 2012a), and for this reason, enhanced tree and shrub growth by climate warming is expected at high elevations in these mountain regions (B€ untgen et al, 2008a;Salzer et al, 2009;Lu et al, 2016). +34 976 716031, fax +34 976 716019, e-mail: jjcamarero@ipe.csic.es plants is mainly constrained by decreasing temperatures upwards (K€ orner, 2012a), and for this reason, enhanced tree and shrub growth by climate warming is expected at high elevations in these mountain regions (B€ untgen et al, 2008a;Salzer et al, 2009;Lu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Diverging shrub and tree growth from the Polar to the Mediterranean biomes across the European continent

Pellizzari¹,

Camarero

Gazol

et al. 2017

Global Change Biology

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Climate warming is expected to enhance productivity and growth of woody plants, particularly in temperature-limited environments at the northernmost or uppermost limits of their distribution. However, this warming is spatially uneven and temporally variable, and the rise in temperatures differently affects biomes and growth forms. Here, applying a dendroecological approach with generalized additive mixed models, we analysed how the growth of shrubby junipers and coexisting trees (larch and pine species) responds to rising temperatures along a 5000-km latitudinal range including sites from the Polar, Alpine to the Mediterranean biomes. We hypothesize that, being more coupled to ground microclimate, junipers will be less influenced by atmospheric conditions and will less respond to the post-1950 climate warming than coexisting standing trees. Unexpectedly, shrub and tree growth forms revealed divergent growth trends in all the three biomes, with juniper performing better than trees at Mediterranean than at Polar and Alpine sites. The post-1980s decline of tree growth in Mediterranean sites might be induced by drought stress amplified by climate warming and did not affect junipers. We conclude that different but coexisting long-living growth forms can respond differently to the same climate factor and that, even in temperature-limited area, other drivers like the duration of snow cover might locally play a fundamental role on woody plants growth across Europe.

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Summer Temperature Drives Radial Growth of Alpine Shrub Willows on the Northeastern Tibetan Plateau

Cited by 17 publications

References 41 publications

Mismatch in elevational shifts between satellite observed vegetation greenness and temperature isolines during 2000–2016 on the Tibetan Plateau

Mismatch in elevational shifts between satellite observed vegetation greenness and temperature isolines during 2000–2016 on the Tibetan Plateau

The Coupling of Treeline Elevation and Temperature is Mediated by Non-Thermal Factors on the Tibetan Plateau

Diverging shrub and tree growth from the Polar to the Mediterranean biomes across the European continent

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