Time Lag Effect on Solar Radiation of Tree Sap Flux Density for Different DBH of Larix olgensis

IF 3 2区环境科学与生态学 Q2 ECOLOGY

Journal of Plant Ecology Pub Date : 2022-09-30 DOI:10.1093/jpe/rtac092

Zixuan Wang, Z. Sun, Jinyao Cui

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Abstract

To clarify the role of tree characteristics and slope positions in the time lag between tree stem sap flux density (Js) and solar radiation (Rs). Plants of different diameter classes in a Larix olgensis near-mature forest (31 years old) in the hilly area of the Sanjiang Plain were used. The relationship between the time lag Js-Rs and tree characteristics, adjacent tree characteristics and slope positions was evaluated. Though both Js and Rs exhibit diurnal variation, they are not synchronized, thus leading to a time lag between Js and Rs. During the growing season, the change in Js lags behind the change in Rs by 21.1 ± 6.9 min. Compared with tree height and crown width, the time lag Js-Rs was more dependent on DBH. The time lag between Js and Rs showed a linear increase with DBH. Compared with the characteristics of neighboring trees, the time lag Js-Rs were more dependent on their own tree characteristics. A significant relationship is not observed between the time lag Js-Rs and SWC. The effects of tree characteristics, adjacent tree characteristics, and slope positions on the formation of the time lag Js-Rs were compared. The time lag of Js on Rs was mainly controlled by the tree characteristics (DBH). DBH is an important factor that affects the time lag between Js and Rs under sunny conditions during the growing season of Larix olgensis.

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不同胸径落叶松树液通量密度对太阳辐射的滞后效应

阐明树木特征和坡度位置在树干树液通量密度（Js）和太阳辐射（Rs）之间的时滞中的作用。以三江平原丘陵区一株31年生的长白落叶松近熟林为材料，对不同直径级的植物进行了研究。评估了时间滞后Js-Rs与树木特征、相邻树木特征和坡度位置之间的关系。尽管Js和Rs都表现出日变化，但它们并不同步，因此导致Js和Rs之间的时间滞后。在生长季节，Js的变化滞后于Rs的变化21.1±6.9分钟。与树高和树冠宽度相比，时间滞后Js-Rs更依赖于DBH。Js和Rs之间的时间滞后随DBH呈线性增加。与相邻树的特性相比，时间滞后Js-Rs更多地取决于它们自己的树特性。在时间滞后Js-Rs和SWC之间没有观察到显著的关系。比较了树木特征、相邻树木特征和坡度位置对时滞Js-Rs形成的影响。Js在Rs上的时滞主要受树特征（DBH）的控制。DBH是影响落叶松生长季节日照条件下Js和Rs之间时间滞后的重要因素。

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来源期刊

Journal of Plant Ecology 生物-植物科学

CiteScore

4.60

自引率

18.50%

发文量

134

审稿时长

3 months

期刊介绍： Journal of Plant Ecology (JPE) serves as an important medium for ecologists to present research findings and discuss challenging issues in the broad field of plants and their interactions with biotic and abiotic environment. The JPE will cover all aspects of plant ecology, including plant ecophysiology, population ecology, community ecology, ecosystem ecology and landscape ecology as well as conservation ecology, evolutionary ecology, and theoretical ecology.