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中国西南干热河谷地区橘树日树干径向生长模式与降水的关系

花匠小妙招
2024-12-29 10:39

中国西南干热河谷地区橘树日树干径向生长模式与降水的关系

IF 5.9 1区地球科学 Q1 ENGINEERING, CIVIL

Xuehui Wei , Dianyu Chen , Panpan Hou , Xiaotao Hu , Lucheng Qiu , Jingying Zhang , Xingwu Duan , Linlin Zhang , Jing Guo

摘要

中国西南干热河谷地区干旱与高温并存。对降雨的有效利用使植物能够安全地应对该地区的环境压力。为了揭示降雨对典型树木次生生长的驱动机制，研究人员选择了该地区普遍种植的经济树种橘树（Citrus sinensis L. Osbeck）作为研究对象。在 2020-2022 年期间，同时监测了树干直径、树液流量、叶片湿度、气象条件和土壤含水量。根据树干直径变化数据的频率分布，将树干直径变化分为正增长型（急剧膨胀型和普通膨胀型）和负增长型（急剧收缩型和普通收缩型）。此外，还分析了不同生长模式与降雨或干旱事件之间的关系。结果表明：i) 树干直径在雨天保持正增长，而在无雨天则出现正增长和负增长。ii）高频率的普通扩张型约占总增长量的 30%，而低频率的急剧扩张型约占总增长量的 70%。iv) 降雨持续时间、叶片润湿时间和降雨量对降雨期间树木直径的累积增长有显著的推动作用。 v) 与降雨量相比，降雨时间相关指数与树木直径急剧扩大的关系更为密切。研究证实，降雨对中国西南干热河谷地区的树木直径增长至关重要。相关结果有助于加深对植物降水利用机制的认识，并可为气候变化背景下的极端气象灾害评估提供有用信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Daily trunk radial growth patterns in relation to precipitation in orange trees in the dry-hot valley region of Southwest China

The dry-hot valley regions of Southwest China suffer droughts and high temperatures coexist environment. The efficient use of rainfall makes it possible for plants to safely cope with the environmental stress in the region. To reveal the driving mechanism of rainfall on typical tree secondary growth, orange tree (Citrus sinensis L. Osbeck), the commonly grown economic tree in the region was selected. Trunk diameter, sap flow, leaf humidity, meteorological conditions and soil water content were simultaneously monitored for the 2020–2022 period. Based on frequency distribution of trunk diameter changes data, trunk diameter changes were classified into positive growth (dramatic expansion, and common expansion), and negative growth (dramatic shrinkage, and common shrinkage) types. Furthermore, the relationships among the different growth patterns and rainfall or drought events were analyzed. The results showed: i) Trunk diameter maintained positive growth on rainy days, whereas both positive and negative growth occurred on rainless days. Although rainy period was not frequent, a high proportion of the total growth occurred during that time. ii) The common expansion type with a high frequency contributed to approximately 30% of the total growth, whereas the dramatic expansion type with a low frequency contributed to approximately 70% of the total growth. iii) There was a highly significant correlation between dramatic tree diameter expansion and rainfall. iv) Cumulative growth in tree diameter during rainy period was significantly driven by the duration of rainfall, the wetting time of leaf and the amount of rainfall. v) Compared with rainfall amount, the time rainfall related indexes were more closely related with tree dramatic diameter expansion. vi) While increasing soil water content and dry air mitigation due to rainfall enhanced average growth, it concurrently suppressed negative growth of tree trunk diameter after rainfall. The study confirmed that rainfall was critical for tree diameter growth in dry-hot valley regions of Southwest China. Relevant results are beneficial for improving understanding of plant precipitation utilization mechanism and could provide useful information on extreme meteorological hazards assessment in the context of climate change.

来源期刊

Journal of Hydrology

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.