黄土高原刺槐林分发育过程中生长的驱动因素

IF 2.7 3区 农林科学 Q1 FORESTRY
Xu Zhang , Meng Chen , Ming Li , Linjia Huang , Yang Cao
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引用次数: 1

摘要

尽管气候变量已被证明对人工林的生长过程有很大影响,但对中国黄土高原林分发育过程中树木大小和营养元素在径向生长过程中的作用知之甚少。在LP上,从4个林分年龄级共采集了98个Robinia pseudoacia L.的年轮芯。基于所有组合树轮,我们重新定义了阿拉伯树轮的生长期,并基于去趋势树轮宽度年表分析了每个生长期的影响因素。采用线性模型和变异划分分析方法,研究了气候、树木大小、元素浓度及其相互作用对树木生长的影响。结果表明,阿拉伯树胶的径向生长被重新定义为两个生长期:下降生长期(1–20年)和稳定生长期(21–40年)。气候因素主要控制稳定生长期的树木径向生长,而不是下降生长期。稳定生长期的径向生长主要受夏季干旱的促进,其变量效应率为34.1%。生长下降期的树径生长主要受磷浓度的促进,解释了41.1%的变量效应百分比。与预期相反,在两个生长期,树木大小和所有变量的交互作用几乎不会影响树木的径向生长。我们的研究表明,适当的营养补充,如磷元素,发生在生长下降期,然后是疏伐和树木组成,以减轻气候影响。总的来说,我们的研究结果为在气候变化的情况下制定LP上的阿拉伯树胶种植园的适当管理策略提供了有价值的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Drivers of Robinia pseudoacacia L. growth during stand development on the Loess Plateau, China

Although climate variables have been shown to strongly affect plantation growth processes, little is known about the roles of tree size and nutrient element in radial growth processes during stand development on the Loess Plateau (LP), China. Total 98 tree-ring cores of Robinia pseudoacacia L. were collected from four stand age-class on LP. We redefined the growth period of R. pseudoacacia based on all combined tree rings and analyzed the influencing factors of each growth period based on the detrending tree ring width chronologies. The effects of climate, tree size, element concentrations, and their interaction effects on tree growth were investigated using linear model and variation partitioning analysis. The results showed that radial growth of R. pseudoacacia was redefined as two growth periods: Decreased Growth Period (1–20 years) and Stable Growth Period (21–40 years). Climate factors mainly controlled tree radial growth in the Stable Growth Period rather than the Decreased Growth Period. The radial growth in the Stable Growth Period was primarily promoted by summer drought, which has 34.1 % of the variables effect percentage. Tree radial growth of R. pseudoacacia in the Decreased Growth Period was mainly promoted by phosphorus (P) concentration, which explained 41.1 % of the variables effect percentage. Contrary to expectations, tree size and the interaction effect of all variables hardly impact on tree radial growth in the two growth periods. Our research illustrated that appropriate nutrient supplementation, such as P elements, occurred during the Decreased Growth Period, followed by thinning practice and tree composition to alleviate climate effects. Overall, our results provide valuable information for formulating appropriate management strategies for R. pseudoacacia plantations on the LP in changing climate.

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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
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