树木特征、干旱和微地形调节亚热带杉属植物对干旱的反应

IF 2.6 2区 农林科学 Q1 FORESTRY
Ruiting Liang, Yujun Sun, Zhaoting zhu, Rui Li
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引用次数: 0

摘要

在气候干旱日益频繁和严重的背景下,了解不同的驱动因素如何影响树木对干旱的反应是前所未有的当务之急。在此,为了充分了解树木干旱响应的复杂性,我们基于324棵树的树环评估了中国东南部冷杉(Cunninghamia lanceolata)的抗旱性(抗性和恢复性),并使用混合效应模型和机器学习(ML)研究了树木大小、干旱前生长表现、多种干旱维度和微地形在影响树木干旱响应中的作用。使用新颖的 SHapley Additive exPlanations(SHAP)方法对 ML 进行了解释。树木对干旱的反应主要受树木特征(树木大小和旱前生长)而非干旱维度(干旱强度、持续时间和发生时序)和微地形(海拔高度和坡度)的影响。抵抗力和恢复力随树木大小和旱前生长变化而增加,但随干旱强度的增加而减少--以负的气候水分平衡来量化。恢复能力随干旱前生长率的增加而增加,但随干旱持续时间的延长而减少。树木生长完全恢复的干旱强度阈值约为-80 毫米。高海拔地区和阴坡分别有利于抗旱(恢复力)和恢复,再加上旱季干旱的影响更大,表明树木在旱季遭受的干旱影响更大,尤其是在中低海拔的阳坡地区。这项研究全面揭示了树木生长对干旱的响应,有助于理解干旱响应复杂性的内在机制。增加低海拔向阳山坡冷杉种植园的大小多样性是应对干旱负面影响的一项可行措施。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tree characteristics, drought and microtopography modulate the response of subtropical Cunninghamia lanceolata to drought

Tree characteristics, drought and microtopography modulate the response of subtropical Cunninghamia lanceolata to drought

Knowledge of how different drivers affect tree responses to drought is unprecedentedly imperative in the context of increasing frequency and severity of climatic droughts. Here, to fully understand the drought response complexity of trees, we assessed drought resilience (resistance and recovery) for Chinese fir (Cunninghamia lanceolata) in Southeast China based on tree ring from 324 trees, and used mixed effects model and machine learning (ML) to examine the roles of tree size, predrought growth performances, multiple drought dimensions, and microtopography in affecting tree drought responses. ML were interpreted using a novel of SHapley Additive exPlanations (SHAP) method. Tree responses to drought were primarily driven by tree characteristics (tree size and predrought growth), rather than drought dimensions (intensity, duration and occurrence Timing) and microtopography (elevation and slope aspect). Resistance and resilience increased with tree size and pre-drought growth variability but decreased with drought intensity- quantified by negative climate water balance. Recovery increased with predrought growth rates but decreased with drought duration. The drought intensity threshold for trees fully recovery of tree growth was about -80 mm. Higher elevations and shady slopes favored resistance (resilience) and recovery respectively, which combined with a greater impact of drought in the dry season suggested that the trees suffered more from droughts that only occurred in the dry season, especially at low- and medium-elevation sunny slopes. This study provided a comprehensive insight into tree growth response to drought, and contributed to the understanding of the mechanisms underlying the complexity of drought response. Increasing size diversity in Chinese fir plantations at sunny lower-elevation slopes is a promising measure to cope with the negative effects of drought.

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来源期刊
CiteScore
5.10
自引率
3.60%
发文量
77
审稿时长
6-16 weeks
期刊介绍: The European Journal of Forest Research focuses on publishing innovative results of empirical or model-oriented studies which contribute to the development of broad principles underlying forest ecosystems, their functions and services. Papers which exclusively report methods, models, techniques or case studies are beyond the scope of the journal, while papers on studies at the molecular or cellular level will be considered where they address the relevance of their results to the understanding of ecosystem structure and function. Papers relating to forest operations and forest engineering will be considered if they are tailored within a forest ecosystem context.
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