Climatic forcing of xylem formation in Qilian juniper on the northeastern Tibetan Plateau

He, Mingzhu; Yang, Bao; Wang, Zhangyong; Bräuning, Achim; Pourtahmasi, Kambiz; Oladi, Reza

doi:10.1007/s00468-015-1333-x

Cited by 24 publications

(14 citation statements)

References 55 publications

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“…An earlier start of the growing season would probably produce more earlywood cells, considering that the maximum daily cell production rate in conifers occurs around the summer solstice [32][33][34]. On the TP, monitoring results also found that the main cell production period occurs between June-July [13,[35][36][37]. The earlywood cells account for a substantial proportion of the whole ring width in conifers, and especially in junipers [38].…”

Section: Relationships Between Wood Formation and Start (Ending) Of Tmentioning

confidence: 67%

Relationships between Wood Formation and Cambium Phenology on the Tibetan Plateau during 1960–2014

Yang

Shishov

et al. 2018

Forests

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Abstract:The variability of tree stem phenology plays a critical role in determining the productivity of forest ecosystems. Therefore, we aim to identify the relationships between the timings of cambium phenology, and forest growth in terms of tree-ring width over a long-term scale. A meta-analysis was performed that combined the timings of xylem formation, which were calculated by a tree-ring formation model of the VS (Vaganov-Shashkin)-oscilloscope during the period 1960-2014, and a tree-ring width series at 20 composite sites on the Tibetan Plateau. Both the start and length of the growing season significantly affected the formation of wood at 70% of the 20 composite sites within the study region. A wider tree ring probably resulted from an earlier start and a longer duration of the growing season. The influence of ending dates on tree-ring width was less evident, and more site-dependent. Weak relationships were identified between the start and end of the growing season at 85% of the composite sites. Compared to the monitoring results, which could only detect the relationships between cambium phenology and xylem cell production from a limited number of trees and years, our long-term relationships deepened such connections, and therefore should be used to improve mechanism models for the accurate evaluating and predicting of wood production and carbon sequestration in forest ecosystems under current and future climate change.

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Section: Relationships Between Wood Formation and Start (Ending) Of Tmentioning

confidence: 67%

Relationships between Wood Formation and Cambium Phenology on the Tibetan Plateau during 1960–2014

Yang

Shishov

et al. 2018

Forests

Self Cite

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“…Tree growth along the upper tree line was greatly limited by temperature in the central region, and by precipitation in the eastern region (wet). He et al (2016) suggested that in the northeastern Qinghai-Tibet Plateau, the ring width of J. przewalskii was mostly controlled by moisture, and was not affected by altitude. The radial growth period of J. przewalskii is in June and July, and the differentiation period of all xylem cells ends in mid-August (He et al, 2013;Gao and Ling, 2020).…”

Section: Radial Growth and Climate Responsementioning

confidence: 99%

“…Tree growth along the upper tree line was greatly limited by temperature in the central region, and by precipitation in the eastern region (wet). He et al. (2016) suggested that in the northeastern Qinghai-Tibet Plateau, the ring width of J. przewalskii was mostly controlled by moisture, and was not affected by altitude.…”

Section: Radial Growth and Climate Responsementioning

confidence: 99%

Appeal: the protection of ancient tree species around the world, taking qilian juniper (Juniperus przewalskii) as an example

Zhao

Yang

Tang

2022

Heliyon

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“…Trees thus enter a stable plateau period in autumn, although lignification of stem tissue cell walls may still occur during this time. However, such processes contribute very little to radial variation [39]. During winter contraction (phase D), when air and soil temperatures drop below 0 • C, trees cannot absorb water from frozen soils, and the water stored in stem tissues is used for transpiration, resulting in continuous stem shrinkage [37].…”

Section: Seasonal Patterns Of Stem Radius Variationmentioning

confidence: 99%

Environmental Controls of Diurnal and Seasonal Variations in the Stem Radius of Platycladus orientalis in Northern China

Dong

Wang

Jiang

et al. 2019

Forests

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Fine-resolution studies of stem radial variation over short timescales throughout the year can provide insight into intra-annual stem dynamics and improve our understanding of climate impacts on tree physiology and growth processes. Using data from high-resolution point dendrometers collected from Platycladus orientalis (Linn.) trees between September 2013 and December 2014, this study investigated the daily and seasonal patterns of stem radial variation in addition to the relationships between daily stem radial variation and environmental factors over the growing season. Two contrasting daily cycle patterns were observed for warm and cold seasons. A daily mean air temperature of 0 °C was a critical threshold that was related to seasonal shifts in stem diurnal cycle patterns, indicating that air temperature critically influences diurnal stem cycles. The annual variation in P. orientalis stem radius variation can be divided into four distinct periods including (1) spring rehydration, (2) the summer growing season, (3) autumn stagnation, and (4) winter contraction. These periods reflect seasonal changes in tree water status that are especially pronounced in spring and winter. During the growing season, the maximum daily shrinkage (MDS) of P. orientalis was positively correlated with air temperature (Ta) and negatively correlated with soil water content (SWC) and precipitation (P). The vapor pressure deficit (VPD) also exhibited a threshold-based control on MDS at values below or above 0.8 kPa. Daily radial changes (DRC) were negatively correlated with Ta and VPD but positively correlated with relative air humidity (RH) and P. These results suggest that the above environmental factors are associated with tree water status via their influence on moisture availability to trees, which in turn affects the metrics of daily stem variation including MDS and DRC.

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Climatic forcing of xylem formation in Qilian juniper on the northeastern Tibetan Plateau

Cited by 24 publications

References 55 publications

Relationships between Wood Formation and Cambium Phenology on the Tibetan Plateau during 1960–2014

Relationships between Wood Formation and Cambium Phenology on the Tibetan Plateau during 1960–2014

Appeal: the protection of ancient tree species around the world, taking qilian juniper (Juniperus przewalskii) as an example

Environmental Controls of Diurnal and Seasonal Variations in the Stem Radius of Platycladus orientalis in Northern China

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