Environmental Drivers for Cambial Reactivation of Qilian Junipers (Juniperus przewalskii) in a Semi-Arid Region of Northwestern China

Zeng, Qiao; Rossi, Sergio; Yang, Bao; Qin, Chun; Li, Gang

doi:10.3390/atmos11030232

Cited by 14 publications

(5 citation statements)

References 42 publications

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“…In addition to temperature, the length of the growing season determines the available period for developing functional xylem through cell maturation and lignification, especially in cold areas 31,33 . In drier ecosystems, water availability for roots, rather than rainfall per se, is another important driver of cambial reactivation 34 . Temperature and the availability and demand of water also codetermine the rate of growth [35][36][37] .…”

Section: Introductionmentioning

confidence: 99%

An earlier start of the thermal growing season enhances tree growth in cold humid areas but not in dry areas

et al. 2022

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Climatic warming alters the onset, duration and cessation of the vegetative season. While prior studies have shown a tight link between thermal conditions and leaf phenology, less is known about the impacts of phenological changes on tree growth. Here, we assessed the relationships between the start of the thermal growing season (TSOS) and tree growth across the extratropical Northern Hemisphere using 3451 tree-ring chronologies and daily climatic data for 1948-2014. An earlier TSOS promoted growth in regions with high ratios of precipitation to temperature but limited growth in cold dry regions. Path analyses indicated that an earlier TSOS enhanced growth primarily by alleviating thermal limitations on wood formation in boreal forests and by lengthening the period of growth in temperate and Mediterranean forests. Semi-arid and dry subalpine forests, however, did not benefit from an earlier onset of growth and a longer growing season, presumably due to associated water loss and/or more frequent early spring frosts. These emergent patterns of how climatic impacts on wood phenology affect tree growth at regional to hemispheric scales hint at how future phenological changes may affect the carbon sequestration capacity of extratropical forest ecosystems.

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Section: Introductionmentioning

confidence: 99%

An earlier start of the thermal growing season enhances tree growth in cold humid areas but not in dry areas

et al. 2022

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“…It has been demonstrated by numerous studies that the onset of xylem phenology in cold and temperate ecosystems is mainly triggered by temperature, according to either the accumulated heat sums or critical threshold temperatures [11,21,[27][28][29], indicating that the initiation of cambial activity occurs when the cambium reaches an appropriate thermal condition. In a cold and arid region of the northeastern Tibetan Plateau, the warm spring could advance the cambial resumption of Juniperus przewalskii independently of the rain events that occur before the growing season [28,30]. Rossi et al [25] proposed that spring temperatures (April and May) produced the best models to predict the timings of xylem phenology in conifers growing in the cold environment of the northern hemisphere.…”

Section: Effect Of Temperatures On the Onset Of Xylem Phenologymentioning

confidence: 99%

May Temperature Drives Cambial Resumption in the Boreal Black Spruce

Zeng

Khan

Deslauriers

et al. 2022

Forests

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The timings of the onset and ending of xylogenesis define the time window when environmental conditions are suitable for xylem formation. The relationship between the occurrence of xylem phenological events and the related climatic factors is critical to revealing how xylem formation responds to the changing climate. Given that temperature is the most important factor influencing growth in the boreal forest, we monitored air temperature and xylem phenology at five permanent plots of black spruce (Picea mariana (Mill.) BSP) along a latitudinal gradient of the boreal forest of Quebec, Canada. Microcores were collected weekly or biweekly from five to ten trees per site during the growing seasons from 2002 to 2019. We compared the relationships between air temperature and timings of the onset and termination of xylogenesis, testing the hypothesis that spring temperatures trigger the initiation of cambial activity. The onset of xylogenesis occurred from late May (DOY 149) to mid-June (DOY 163), and it terminated between late August (DOY 240) and late September (DOY 270). The spring phases of xylem phenology showed similar inter-annual variation among sites, while the variation in autumnal phases was less correlated among sites. The onset of xylogenesis was negatively correlated with the mean May temperature, and the correlations were consistent among sites, with r ranging from −0.61 to −0.77. The warmer May temperatures would advance cambial resumption, allowing the initial hypothesis that spring temperatures are a driving factor of xylogenesis to be accepted. With an increase of 1 °C in the mean May temperature, cambial resumption could be advanced by 2.7 days. Yet, no relationship between the termination of xylem phenology and monthly temperature was established, suggesting that other factors, possibly endogenous, could have affected the xylem phenology in autumn. Under warming conditions, we expect an advancement in the onset of xylogenesis, which may lengthen the growing season and potentially enhance cell production in black spruce.

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“…There are also differences in the uptake strategies of SM by trees in different moisture environments [8]. Some studies have found that the SM plays a role in tree growth on the Tibetan Plateau (TP) [9,10], especially during the growing season [11]. Unfortunately, it is not practical to collect soil samples when conducting large-scale studies, making it exceptionally difficult to use measured soil data to study tree water use strategies.…”

Section: Introductionmentioning

confidence: 99%

Seasonal and Depth Dynamics of Soil Moisture Affect Trees on the Tibetan Plateau

Li,

Jiao,

Xue

et al. 2024

Forests

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The soil moisture (SM) influences tree growth with climate change. However, the spatial and temporal dynamics of tree water use strategies in climate-sensitive areas remain uncertain. Therefore, we collected the tree-ring oxygen isotope (δ18OTR) chronologies and divided the wet–dry gradients according to the precipitation on the Tibetan Plateau (TP). Further, the relationship between the δ18OTR and environmental factors was analyzed across different gradients. We found the following: (1) The SM during the growing season was the most important factor for δ18OTR. (2) The response of the δ18OTR to the SM had a lag in arid areas than in humid areas. (3) Trees absorbed the SM on the surface in humid areas (r = −0.49 to −0.41, p < 0.01), while trees absorbed the SM from deep in the soil in arid areas (r = −0.48 to −0.29, p < 0.01). The results demonstrated that trees were better able to cope with drought stress in arid regions because they used more stable deep soil water than in humid regions. Therefore, the findings will provide a scientific basis for water use of trees using the δ18OTR in complex environmental contexts. Trees with single water use strategies should be given more attention to keep ecosystems healthy.

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Environmental Drivers for Cambial Reactivation of Qilian Junipers (Juniperus przewalskii) in a Semi-Arid Region of Northwestern China

Cited by 14 publications

References 42 publications

An earlier start of the thermal growing season enhances tree growth in cold humid areas but not in dry areas

An earlier start of the thermal growing season enhances tree growth in cold humid areas but not in dry areas

May Temperature Drives Cambial Resumption in the Boreal Black Spruce

Seasonal and Depth Dynamics of Soil Moisture Affect Trees on the Tibetan Plateau

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