Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau

Li, Xiaoxia; Rossi, Sergio; Liang, Eryuan; Camarero, J. Julio

doi:10.1007/s00468-016-1436-z

Cited by 42 publications

(19 citation statements)

References 43 publications

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“…There is growing evidence that tree growth at treeline is mainly limited by summer temperatures in this region [16,21,22,[39][40][41][42][43][44][45][46][47], thereby suggesting a coupling of thermal conditions and treeline dynamics. In some sites and species, moisture availability also constrains tree growth at treelines [4,48].…”

Section: Discussionmentioning

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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Section: Discussionmentioning

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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“…In cold area, tree recovery after droughts depends on its ability to initiate cambial growth in spring which is closely linked to temperature regulation (Ford, Harrington, Bansal, Gould, & St. Clair, 2016;Li, Rossi, Liang, & Camarero, 2016). The greater the interannual increase in diurnal temperature range, the higher the ability of tree recovery.…”

Section: Increased Tree Resilience and Its Causesmentioning

confidence: 99%

“…The greater the interannual increase in diurnal temperature range, the higher the ability of tree recovery. In cold area, tree recovery after droughts depends on its ability to initiate cambial growth in spring which is closely linked to temperature regulation (Ford, Harrington, Bansal, Gould, & St. Clair, 2016;Li, Rossi, Liang, & Camarero, 2016). Cloud cover, which largely determine the mean magnitudes of DTR, affects greatly daily maximum temperature and daytime evapotranspiration on plateau (Dai, Trenberth, & Karl, 1999).…”

Section: Increased Tree Resilience and Its Causesmentioning

confidence: 99%

Tree resilience to drought increases in the Tibetan Plateau

Fang

Zhang

2018

Global Change Biology

116

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Forests in the Tibetan Plateau are thought to be vulnerable to climate extremes, yet they also tend to exhibit resilience contributing to the maintenance of ecosystem services in and beyond the plateau. So far the spatiotemporal pattern in tree resilience in the Tibetan Plateau remains largely unquantified and the influence of specific factors on the resilience is poorly understood. Here, we study ring‐width data from 849 trees at 28 sites in the Tibetan Plateau with the aim to quantify tree resilience and determine their diving forces. Three extreme drought events in years 1969, 1979, and 1995 are detected from metrological records. Regional tree resistance to the three extreme droughts shows a decreasing trend with the proportion of trees having high resistance ranging from 71.9%, 55.2%, to 39.7%. Regional tree recovery is increasing with the proportion of trees having high recovery ranging from 28.3%, 52.2%, to 64.2%. The area with high resistance is contracting and that of high recovery is expanding. The spatiotemporal resistance and recovery are associated with moisture availability and diurnal temperature range, respectively. In addition, they are both associated with forest internal factor represented by growth consistence among trees. We conclude that juniper trees in the Tibetan Plateau have increased resilience to extreme droughts in the study period. We highlight pervasive resilience in juniper trees. The results have implications for predicting tree resilience and identifying areas vulnerable to future climate extremes.

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“…trado en el estudio de árboles y arbustos (Aljaro et al 1972, Deslauriers et al 2008, Thibeault-Martel et al 2008, Liang et al 2009, Treml et al 2015, Li et al 2016, Dickson et al 2017, pero desconocemos si se han evaluado en criptofítas. Aunado a esto, son escasos los trabajos que mencionan lo que sucede con el floema (Prislan et al 2013).…”

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Actividad cambial y cribo-xilogenesis de tres especies en un gradiente altitudinal en la Sierra Nevada, México

et al. 2019

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Antecedentes: Xilema y floema secundarios son derivados del cambium vascular y su dinámica (cribo-xilogénesis) se ha estudiado en coníferas y dicotiledóneas que crecen en un mismo sitio. Estudios que evalúen la cribo-xilogénesis en especies de amplia distribución altitudinal y con diferentes formas de vida son escasos. Pregunta: ¿existen diferencias en la actividad cambial y cribo-xilogénesis entre especies con distintas formas de vida y distribución diferencial en un gradiente altitudinal? Especies de estudio: Alchemilla procumbens, Acaena elongata y Ribes ciliatum. Sitio de estudio y fechas: Cerro Tláloc, Sierra Nevada, Estado de México, México, de 2015 a 2017. Métodos: Se recolectaron ramas durante 24 meses por especie por sitio y los tejidos se procesaron a través de la técnica de inclusión en metilcrilato. Resultados: Las tres especies pueden diferenciar el floema antes que el xilema, ser simultánea en ambos tejidos (Alchemilla) o el floema ser no conductor antes de finalizar la xilogénesis (Acaena). Los periodos de actividad cambial y de cribo-xilogénesis fueron más largos (17 semanas) en Acaena (hemicriptófita) y Ribes (fanerófita), mientras que en Alchemilla (criptófita) fueron más cortos pero intermitentes a lo largo del año y ambos se redujeron aún más con el incremento en la altitud. Conclusiones: La actividad cambial y la xilogénesis entre individuos de diferentes altitudes sugieren que ambos son plásticos y que responden a factores ambientales de cada sitio. En las tres especies, la cribogénesis es menos variable que la xilogénesis como se ha registrado en otras especies. La respuesta rápida de cambium vascular en Alchemilla sugiere que aprovecha los pulsos de factores ambientales beneficiosos para la cribo-xilogénesis.

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Temperature thresholds for the onset of xylogenesis in alpine shrubs on the Tibetan Plateau

Cited by 42 publications

References 43 publications

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

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

Tree resilience to drought increases in the Tibetan Plateau

Actividad cambial y cribo-xilogenesis de tres especies en un gradiente altitudinal en la Sierra Nevada, México

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