Che Cunwei, Zhang Mingjun, Yang Wanmin, Wang Shengjie, Zhang Yu, Liu Lingling
College of Geography and Environmental Science, Northwest Normal University, Lanzhou, China.
Key Laboratory of Resource Environment and Sustainable Development of Oasis, Lanzhou, Gansu, China.
Front Plant Sci. 2024 Apr 8;15:1357472. doi: 10.3389/fpls.2024.1357472. eCollection 2024.
Quantitative assessment of tree responses to the local environment can help provide scientific guidance for planted forest management. However, research on the climate-growth relationship of Korshinsk peashrub ( Kom.) under different land preparation and post-management (irrigation) conditions is still insufficient. In this study, we collected 223 tree-ring samples from Korshinsk peashrubs using dendroecological methods and systematically quantified the relationships between shrub growth and climatic factors under different management practices in the western Loess Plateau of China. Our findings demonstrated that drought stress caused by scarce precipitation from April to August was the primary factor limiting the growth of Korshinsk peashrubs in the northern and southern mountains of Lanzhou. The "" climate model results showed a weak correlation between natural Korshinsk peashrub growth and drought stress, whereas planted Korshinsk peashrub under rain-fed conditions in the southern mountain was significantly (<0.05) limited by drought stress from April to August. Moreover, planted Korshinsk peashrub growth under irrigated conditions in the northern mountain was limited only by drought stress in January. Drought model explained 28.9%, 38.3%, and 9.80% of the radial growth variation in Xiguoyuan (XGY), Shuibaozhan (SBZ), and Zhichagou (ZCG) sites, respectively. Artificial supplementary irrigation alleviated the limitation of drought on planted forest growth, which may be implemented for Korshinsk peashrubs planted on sunny slopes, while planted Korshinsk peashrubs under natural rain-fed conditions can be planted on shady slopes through rainwater harvesting and conservation measures such as horizontal ditches and planting holes.
对树木对当地环境的响应进行定量评估有助于为人工林管理提供科学指导。然而，关于不同整地和后期管理（灌溉）条件下柠条锦鸡儿（Kom.）气候-生长关系的研究仍不充分。在本研究中，我们采用树木年轮生态学方法从柠条锦鸡儿上采集了223个树木年轮样本，并系统地量化了中国黄土高原西部不同管理措施下灌木生长与气候因子之间的关系。我们的研究结果表明，4月至8月降水稀少导致的干旱胁迫是限制兰州南北山区柠条锦鸡儿生长的主要因素。“气候模型结果显示，天然柠条锦鸡儿生长与干旱胁迫之间的相关性较弱，而南部山区雨养条件下的人工柠条锦鸡儿受到4月至8月干旱胁迫的显著限制（<0.05）。此外，北部山区灌溉条件下人工柠条锦鸡儿的生长仅受1月干旱胁迫的限制。干旱模型分别解释了西果园（XGY）、水保站（SBZ）和纸岔沟（ZCG）站点径向生长变化的28.9%、38.3%和9.80%。人工补充灌溉缓解了干旱对人工林生长的限制，对于阳坡种植的柠条锦鸡儿可以实施该措施，而天然雨养条件下的人工柠条锦鸡儿可以通过水平沟和种植穴等雨水收集和保水措施种植在阴坡。
