Variations in stem radii of Larix principis-rupprechtii to environmental factors at two slope locations in the Liupan Mountains, northwest China

Ma, Jinzhu; Guo, Junhong; Wang, Yanhui; Liu, Zebin; Gao, Di; Hong, Liu; Zhang, Ziyou

doi:10.1007/s11676-020-01114-w

Cited by 11 publications

(4 citation statements)

References 43 publications

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“…The effect of rainfall on stem growth and circadian cycles has been repeatedly reported as important (Tardif et al 2001;Deslauriers et al 2003Deslauriers et al , 2007bOberhuber and Gruber 2010;Oberhuber 2017;Camarero and Rubio-Cuadrado 2020;Ma et al 2021). However, we did not study this variable because no rainfall occurred in the studied months of spring, summer and autumn, and only few events were recorded in winter (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Effects of fertilization on radial growth of Pinus pinea explored hourly using dendrometers

Loewe-Muñoz,

del Río Millar,

Delard Rodriguez

et al. 2024

Ecol Process

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Background Stone pine (Pinus pinea), a drought-resistant species, has significant socio-economic benefits and increasing interest for the establishment of productive plantations in several countries, especially in a climate change context. Monitoring hourly stem diameter variations contributes to the understanding of the tree-growth response to changes in environmental conditions and management. By monitoring the diameter expansion of tree stems, high-resolution band dendrometers were used to study the development of adult trees growing in a semi-arid coastal environment of central Chile under fertilized and non-fertilized soil conditions through the span of a year. Results Short cycles (< 21 h) were few in fertilized and non-fertilized trees (6 and 4, respectively), whereas long cycles (> 28 h) occurred at a higher frequency in fertilized trees (16 vs 6). Most of the circadian cycles were regular (24 ± 3 h). The longest cycle duration (59 h) was observed in fertilized trees during spring. In all seasons, each phase of the circadian cycle, especially during the stem diameter increment phase (P3, irreversible growth), started earlier in fertilized than in control trees. P3 duration was significantly longer in fertilized than in control trees in springtime. The maximum shrinkage (P1) was observed in summer for both treatments. Stem diameter increased faster in fertilized than in control trees throughout the year, with the highest accumulation occurring in spring and the lowest in autumn. The daily variability pattern showed lower growth under high temperature across seasons. Conclusions This study highlights the importance of fertilization in enhancing stone pine diameter growth. This cultural practice should be further explored to contribute to the mitigation of climate change effects in semi-arid environments.

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Section: Discussionmentioning

confidence: 99%

Effects of fertilization on radial growth of Pinus pinea explored hourly using dendrometers

Loewe-Muñoz,

del Río Millar,

Delard Rodriguez

et al. 2024

Ecol Process

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“…Finally, the boundary points along the x axis (arithmetic center of each segment) were used to describe the upper boundary line [45]. It was assumed that the effects of each single factor on transpiration are independent of each other, so the coupled model of transpiration affected by each factor was the multiplication relationship between transpiration and the response function of each single environmental factor [51]. The numerous factors influencing daily T can be simplified and divided into the three driving factors of Rn, VPD, and REW.…”

Section: Model Structure and Statistical Assessmentmentioning

confidence: 99%

Environmental Factors Driving the Transpiration of a Betula platyphylla Sukaczev Forest in a Semi-arid Region in North China during Different Hydrological Years

Zhao

Liu

et al. 2022

Forests

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More and more droughts happened during the last decades, threatening natural forests in the semi-arid regions of North China. The increase in drought pressure may have an impact on stand transpiration (T) in semi-arid regions due to rising temperature and changes in precipitation. It is unclear how the transpiration of natural forest in semi-arid regions respond to drought, which is regulated by environmental factors. In this study, a relatively simple but mechanism-based forest stand T model that couples the effects of the reference T, solar radiation (Rn), vapor pressure deficit (VPD), and relative extractable water (REW) in the 0–80 cm soil layer was developed to quantify the independent impacts of Rn, VPD, and REW on T. The model was established based on the observed sap flow of four sample trees, and environmental factors were observed from May to September in different hydrological years (2015, 2017, 2018, and 2021) in a pure white birch (Betula platyphylla Sukaczev) forest stand in the southern section of the Greater Khingan Mountains, northeastern China. The sap flow data were used to calculate tree transpiration (Tt) and T to calibrate the T model. The results indicated that (1) The Tt sharply declined in the ‘dry’ year compared with that in the ‘wetter’ year. The daily Tt for small trees in the ‘dry’ year was only one-fifth of that in the ‘wetter’ year, and the daily Tt of large trees was 48% lower than that in the ‘normal’ year; (2) Large trees transpired more water than small trees, e.g., the daily Tt of small trees was 89% lower than that of the large trees in the ‘normal’ year; (3) Daily T increased with the increase in Rn, and the response conformed to a binomial function. Daily T responded to the rise of VPD and REW in an exponential function, first increasing rapidly, gradually reaching the threshold or peak value, and then stabilizing; (4) The driving factors for the T shift in different hydrological years were the REW in the ‘dry’ year, but the Rn and REW in the ‘wet’, ‘normal’, and ‘wetter’ years. The REW in the ‘wet’ and ‘wetter’ years exerted positive effects on T, but in the ‘normal’ and ‘dry’ year, exerted negative effects on T. Thus, the environmental factors affecting T were not the same in different hydrological years.

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“…In this study, the errors of P. tomentosa and S. babylonica were -60.96% and -63.37%, respectively. TDP measurement errors are mainly due to the biological and physical characteristics of trees, such as the sapwood area of Granier's original formula, which requires the measurement of cross-sectional area without damaging the tree, possibly resulting in errors in determining the sapwood area (Jia et al, 2020;Ma et al, 2020). The length of sapwood conduits, the size of conduit diameter, and the number of grain pores, which affect the water transfer efficiency of conduits (Baas, 1976;Tyree and Zimmermann, 2013;Li, 2018).…”

Section: Validation and Correction Of The Original Granier's Formulamentioning

confidence: 99%

Verification of sap flow characteristics and measurement errors of Populus tomentosa Carr. and Salix babylonica L. based on the liquid level equilibrium method

Liu

Zhang

et al. 2022

Front. Plant Sci.

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This study clarified the characteristics and influencing factors of sap flow in Populus tomentosa Carr. and Salix babylonica L., and verified the applicability of Granier’s original formula for measuring the sap flow of the two species, aimed to provide a basis for the accurate assessment of tree transpiration. P. tomentosa and S. babylonica were used as research objects, their sap flow was measured by the thermal dissipation probe method (TDP), together with changes in meteorological factors and soil water content. Meanwhile, the transpiration of both species was measured by the liquid level equilibrium method (LLE) to verify the applicability of Granier’s original formula. We found that: (1) the sap flow velocity of P. tomentosa and S. babylonica under typical sunny and cloudy conditions showed unimodal or bimodal changes, which were highly significantly correlated with meteorological factors (P < 0.01), but they were all small and poorly correlated with meteorological factors on rainy days. (2) The sap flow velocity of both species was significantly and negatively correlated (P < 0.05) with the daily change in stem and soil water content at 10–20 cm. (3) Compared to that calculated with the LLE method, the sap flows of the two species calculated by the TDP technique using Granier’s original formula were seriously underestimated, with error rates of -60.96% and -63.37%, respectively. The Granier’s correction formulas for P. tomentosa and S. babylonica established by the LLE method were Fd = 0.0287K1.236 (R2 = 0.941) and Fd = 0.0145K0.852 (R2 = 0.904), respectively, and the combined correction formula was Fd = 0.0235K1.080 (R2 = 0.957). It was verified that the errors of sap flow calculated by the specific correction formulas for P. tomentosa and S. babylonica were -6.18% and -5.86%, and those calculated by the combined correction formula were -12.76% and -2.32%, respectively. Therefore, the characteristics of the sap flow velocity of P. tomentosa and S. babylonica on sunny, cloudy and rainy days were different and significantly influenced by meteorological factors. The original Granier’s formula for calculating their sap flow resulted in a large error, but can be measured more accurately by constructing specific correction and combination formulas through the LLE method.

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Variations in stem radii of Larix principis-rupprechtii to environmental factors at two slope locations in the Liupan Mountains, northwest China

Cited by 11 publications

References 43 publications

Effects of fertilization on radial growth of Pinus pinea explored hourly using dendrometers

Effects of fertilization on radial growth of Pinus pinea explored hourly using dendrometers

Environmental Factors Driving the Transpiration of a Betula platyphylla Sukaczev Forest in a Semi-arid Region in North China during Different Hydrological Years

Verification of sap flow characteristics and measurement errors of Populus tomentosa Carr. and Salix babylonica L. based on the liquid level equilibrium method

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