| 引用本文: | 薛玉洋,孙家钰,包光,刘娜,吴买利.2025.基于过程模拟的不同水热条件下沙地樟子松径向生长速率分析[J].地球环境学报,16(3):358-367 |
| XUE Yuyang,SUN Jiayu,BAO Guang,LIU Na,WU Maili.2025.The radial growth characteristics of Pinus sylvestris var. mongolica in sandy land based on process simulation under different hydrothermal conditions[J].Journal of Earth Environment,16(3):358-367 |
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| 摘要: |
| 基于VS（Vaganov-Shashkin）生理模型，探究呼伦贝尔地区天然沙地樟子松（Pinus sylvestris var. mongolica）径向生长与水热气候因素的交互关系，有助于理解树木生长的气候驱动和作用机制。分析结果表明：1960—1999年土壤湿度是5—9月生长季树木径向生长的主要限制因素，温度对生长速率的影响不显著。偏冷偏湿年和偏暖偏干年水热组合下，所有样点树木总体生长速率差异显著（P＜0.01）。温度相关生长速率值低于土壤湿度相关生长速率值出现在4月，表明温度在树木生长初期发挥主要作用。生长季内，春季和秋季相对生长速率高，夏季相对生长速率低。所有水热配置下，生长季树木总体生长速率呈双峰型波动。温度和降水共同影响的土壤可利用水程度主导着树木径向生长速率的演变过程。呼伦贝尔天然沙地樟子松径向生长速率特征响应了东亚夏季风边缘地区水文气候变化特点。 |
| 关键词: 径向生长 响应 生理机制 VS 模型 |
| DOI：10.7515/JEE232035 |
| CSTR：32259.14.JEE232035 |
| 分类号: |
| 基金项目:陕西省高层次人才特殊支持计划；黄土与第四纪地质国家重点实验室开放基金（SKLLQG2109，SKLLQG2031）；陕西省普通高校第二批青年杰出人才支持计划 |
| 英文基金项目:Shaanxi High-Level Talents Special Support Program; Open Fund of State Key Laboratory of Loess and Quaternary Geology (SKLLQG2109, SKLLQG2031); Second Outstanding Young Talents of Shaanxi Universities |
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| The radial growth characteristics of Pinus sylvestris var. mongolica in sandy land based on process simulation under different hydrothermal conditions |
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XUE Yuyang1, SUN Jiayu1, BAO Guang1, 2, 3*, LIU Na1, 2, 3, WU Maili1
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1. School of Geography and Environment, Baoji University of Arts and Sciences, Baoji 721013, China
2. Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji 721013, China
3. State Key Laboratory of Loess Science, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, China
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| Abstract: |
| Background, aim, and scope Growth of trees in the Hulun Buir sandy land, Nei Mongol Autonomous Region is facing serious environmental threats due to high precipitation variability and warming climate conditions. The characteristics of tree radial growth in response to climatic factors under non-extreme water and heat allocation modes are stable and persistent. However, under the continuous intensification of global warming, compound extreme climatic events caused by the combination of high temperature and drought have disrupted the climatic response patterns of tree growth. Therefore, exploring how water and heat allocation conditions regulate the characteristics and patterns of tree radial growth responses under extreme conditions can help enhance the understanding of the interactions between trees and hydroclimatic elements under changing environmental conditions. The relationship between tree radial growth and hydrothermal factors based on physiological models under the extreme conditions is helpful to understand the interaction mechanism between tree growth and climate forcing, especially in the semi-arid area located at the edge of the East Asian monsoon. Materials and methods Based on the four water-heat configurations determined by the average temperature and precipitation during the tree growing season from May to September, the Vaganov-Shashkin model (VS model) was performed to simulate the radial growth of Pinus sylvestris var. mongolica at four sampling sites in Hulun Buir sandy land and identified the response patterns between tree radial growth rate and hydroclimate driving factors during the common period from 1960 to 1999. Results Soil moisture was the main limiting factor for the radial growth of trees in the growing season, and the relative growth rate induced by temperature was not significant in all sample points (P＞0.05). The overall growth rate at four sampling sites showed significant differences (P＜0.01). Discussion The temperature-related radial growth rate of trees appeared at the beginning of April, which was earlier than the time of the soil moisture-related growth rate, reflecting the impact of threshold temperature on the beginning of the growing season of trees. In the growth season from May to September, the relatively high growth rate value appears in spring and autumn, and the relatively low growth rate value appears in summer, which is closely related to the increase of evapotranspiration caused by high temperature in summer and the intensification of soil water drought stress. Under all the water-heat allocation scenarios, the overall growth rate of trees in the growing season displayed a similar fluctuation pattern, which was consistent with the simulation results of the tree radial growth in the semi-arid area of Northwest China. Conclusions The amount of soil water availability, which is affected by both temperature and precipitation, plays a dominant role in the evolution of the radial growth rate of trees. Recommendations and perspectives This study suggests that the pines in Hulun Buir sandy land could respond to hydroclimate characteristics one the edge of the East Asian summer monsoon. The stability and formation mechanism of the bimodal variation of the simulated overall radial growth rates are still needed to be confirmed and revised by continuous field monitoring. |
| Key words: radial growth response physiological mechanism VS model |
