Daily and seasonal patterns of stem diameter micro-variations in three semiarid forest species in relation to water status and environmental factors

IF 2.7 3区 农林科学 Q1 FORESTRY
Mei-Jun Liu , Qiu-Wen Chen , Hai-Ning Guo , Jinlin Lyu , Guoqing Li , Sheng Du
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引用次数: 0

Abstract

Understanding the relationship between stem diameter micro-variation (SDMV) and stem water status and revealing the mechanism regulating stem water are essential for elucidating environmental adaptation and water use strategies in forest trees. Here, we report the results of the year-round monitoring (November 2018–October 2019) of SDMV and xylem sap flow obtained using high-resolution dendrometers and Granier-type thermal dissipation probes, respectively, in mature trees of three species in the semiarid Loess Plateau region: Quercus liaotungensis, Platycladus orientalis, and Robinia pseudoacacia. The year-round trend for the variations in stem diameter can be divided into phases of a decreasing period and a relatively stable period in the non-growing season, and a progressive rise and fluctuating plateau throughout the growing season. The observed interspecific differences in the time to full recovery from the water deficit state corresponded to species phenology and soil moisture conditions. These differences were manifested as the responses of sap flux density (Fd) and tree water deficit (TWD) to variations in soil water content during the growing season. Q. liaotungensis implements stomatal regulation early to avoid drastic water loss in the trunk, P. orientalis maintains a relatively stable Fd at the expense of increased TWD under soil drought, and R. pseudoacacia maintains relatively low stomatal conductance under soil drought with an increase in TWD. The results revealed that SDMV is determined by the stem water status and species-specific strategies for water use, which could provide beneficial information for forestation practices in semiarid regions.

三种半干旱森林树种茎粗微变化的日与季节格局与水分状况和环境因子的关系
了解树干直径微变化(SDMV)与水分状况的关系,揭示树干水分的调节机制,对于阐明森林树木的环境适应和水分利用策略具有重要意义。本文报道了2018年11月至2019年10月,利用高分辨率树木计和granier型热耗散探针对辽东栎、东方栎和刺槐三种半干旱黄土高原地区成熟树种的SDMV和木质部液流进行全年监测的结果。茎粗的全年变化趋势可分为非生长期的下降期和相对稳定期,以及整个生长期的渐进上升和波动平台期。从水分亏缺状态完全恢复所需时间的种间差异与物种物候和土壤水分条件有关。这些差异表现为树液通量密度(Fd)和树木水分亏缺(TWD)对生长季节土壤含水量变化的响应。辽东栎较早实施气孔调控,避免树干水分剧烈流失;东洋栎在土壤干旱条件下保持相对稳定的Fd,以增加TWD为代价;刺槐在土壤干旱条件下保持相对较低的气孔导度,增加TWD。结果表明,SDMV是由茎干水分状况和物种特有的水分利用策略决定的,可为半干旱区造林提供有益信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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