Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau

Ren, Ping; Rossi, Sergio; Camarero, J. Julio; Ellison, Aaron M.; Liang, Eryuan; Peñuelas, Josep

doi:10.1093/aob/mcx188

Cited by 93 publications

(58 citation statements)

References 55 publications

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“…, Ren et al. ). In addition, drought has also increased the frequency of missing rings in alpine birch forests in the central Himalayas (Liang et al.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, several studies showed that interactions between temperature and precipitation leading to dry conditions limit seedling establishment and tree species distribution shifts in the Rocky Mountains (Hessl and Baker 1997, Lloyd and Graumlich 1997, Elliott 2012, Moyes et al 2015, Kueppers et al 2017. High-elevation forests on the dry northeastern Tibetan Plateau are increasingly at risk of growth decline and mortality , Fang et al 2018, Ren et al 2018. In addition, drought has also increased the frequency of missing rings in alpine birch forests in the central Himalayas (Liang et al 2014).…”

Section: Discussionmentioning

confidence: 99%

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Past the climate optimum: Recruitment is declining at the world's highest juniper shrublines on the Tibetan Plateau

Liang

Wang

et al. 2019

Ecology

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Alpine biomes are climate change hotspots, and treeline dynamics in particular have received much attention as visible evidence of climate‐induced shifts in species distributions. Comparatively little is known, however, about the effects of climate change on alpine shrubline dynamics. Here, we reconstruct decadally resolved shrub recruitment history (age structure) through the combination of field surveys and dendroecology methods at the world's highest juniper (Juniperus pingii var. wilsonii) shrublines on the south‐central Tibetan Plateau. A total of 1,899 shrubs were surveyed at 12 plots located in four regions along an east‐to‐west declining precipitation gradient. We detected synchronous recruitment with 9 out of 12 plots showing a gradual increase from 1600 to 1900, a peak at 1900–1940, and a subsequent decrease from the 1930s onward. Shrub recruitment was significantly and positively correlated with reconstructed summer temperature from 1600 to 1940, whereas it was negatively associated with temperature in recent decades (1930–2000). Recruitment was also positively correlated with precipitation, except in the 1780–1830 period, when a trend toward wetter climate conditions began. Warming‐induced drought limitation has likely reduced the recruitment potential of alpine juniper shrubs in recent decades. Ongoing warming without a simultaneous increase in precipitation is expected to further impair recruitment at the world's highest juniper shrublines and alter the dynamics and competitive balance between woody plant species throughout these alpine biomes.

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“…, Ren et al. ). In addition, drought has also increased the frequency of missing rings in alpine birch forests in the central Himalayas (Liang et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Past the climate optimum: Recruitment is declining at the world's highest juniper shrublines on the Tibetan Plateau

Liang

Wang

et al. 2019

Ecology

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“…Under severe drought conditions, high competition for moisture between neighboring trees will further exacerbate drought stress for tree growth [47][48][49][50]. As shown in a recent study, low winter and spring precipitation can cause a delay of the initiation of xylogenesis and contribute to the occurrence of the locally missing rings in years with extremely dry springs [51]. Ongoing warming temperatures could not only cause soil moisture deficiency but also amplify temperature-induced drought stress, thereby limiting tree growth and posing a risk of die-off under a warming climate [52][53][54][55][56].…”

Section: Climate-and Drought-growth Associations: the Pivotal Role Ofmentioning

confidence: 93%

Moisture-Limited Tree Growth for a Subtropical Himalayan Conifer Forest in Western Nepal

Sigdel

Dawadi

Camarero

et al. 2018

Forests

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Chir pine (Pinus roxburghii Sarg.) is a common tree species with ecological and economic importance across the subtropical forests of the central Himalayas. However, little is known about its growth response to the recent warming and drying trends observed in this region. Here, we developed a 268-year-long ring-width chronology (1743-2010) from western Nepal to investigate its growth response to climate. Based on nearby available meteorological records, growth was positively correlated with winter (November to February; r = 0.39, p < 0.05) as well as March to April (r = 0.67, p < 0.001) precipitation. Growth also showed a strong positive correlation with the sum of precipitation from November of the previous year to April of the current year (r = 0.65, p < 0.001). In contrast, a negative relationship with the mean temperature in March to April (r = −0.48, p < 0.05) suggests the influence of warming-induced evapotranspiration on tree growth. Spring droughts lasting 4-6 months constrain Chir pine growth. These results are supported by the synchronization between droughts and very narrow or locally missing rings. Warming and drying tendencies during winter and spring will reduce forest growth and resilience and make Chir pine forests more vulnerable and at higher risk of growth decline and dieback.

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“…It has been shown before that in a dry environment, the onset of xylogenesis is regulated by both the temperature threshold and moisture supply [64]. Later, both the growth rate during the season and the timing of the growth cessation are regulated by water deficit [65].…”

Section: Climatic Response and Growth Modeling Of Treesmentioning

confidence: 99%

Response of Four Tree Species to Changing Climate in a Moisture-Limited Area of South Siberia

Babushkina

Zhirnova

Belokopytova

et al. 2019

Forests

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The response of vegetation to climate change is of special interest in regions where rapid warming is coupled with moisture deficit. This raises the question of the limits in plants' acclimation ability and the consequent shifts of the vegetation cover. Radial growth dynamics and climatic response were studied in Scots pine (Pinus sylvestris L.), Siberian larch (Larix sibirica Ledeb.), and silver birch (Betula pendula Roth.) in the forest-steppe, and for Siberian elm (Ulmus pumila L.) in the steppe of South Siberia, as indicators of vegetation state and dynamics. Climate-growth relationships were analyzed by the following two approaches: (1) correlations between tree-ring width chronologies and short-term moving climatic series, and (2) optimization of the parameters of the Vaganov-Shashkin tree growth simulation model to assess the ecophysiological characteristics of species. Regional warming was accompanied by a slower increase of the average moisture deficit, but not in the severity of droughts. In the forest-steppe, the trees demonstrated stable growth and responded to the May-July climate. In the steppe, elm was limited by moisture deficit in May-beginning of June, during the peak water deficit. The forest-steppe stands were apparently acclimated successfully to the current climatic trends. It seems that elm was able to counter the water deficit, likely through its capacity to regulate transpiration by the stomatal morphology and xylem structure, using most of the stem as a water reservoir; earlier onset; and high growth rate, and these physiological traits may provide advantages to this species, leading to its expansion in steppes.

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Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau

Cited by 93 publications

References 55 publications

Past the climate optimum: Recruitment is declining at the world's highest juniper shrublines on the Tibetan Plateau

Past the climate optimum: Recruitment is declining at the world's highest juniper shrublines on the Tibetan Plateau

Moisture-Limited Tree Growth for a Subtropical Himalayan Conifer Forest in Western Nepal

Response of Four Tree Species to Changing Climate in a Moisture-Limited Area of South Siberia

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