估算在北方森林不同气候条件下生长的苏格兰松树幼树、中龄树和老龄树的韧皮部传导率。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-08-03 DOI:10.1093/treephys/tpae081
Tatiana V Tarelkina, Aleksandra A Serkova, Natalia A Galibina, Elena V Novichonok, Sergei A Moshnikov, Diana S Ivanova, Ludmila I Semenova
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引用次数: 0

摘要

在森林中,树木在光合作用中固定的碳有很大一部分是沿着导电的韧皮部输送到地下的,因此韧皮部解剖结构的变化会导致输送能力的变化。树木层面的韧皮部传导率(Ktree)也受树木高度的影响。韧皮部解剖结构和树的大小都会在生长过程中发生变化,而且在不同的环境条件下也会有所不同。我们的工作目标是找出生长在北方天然林中的苏格兰松树 Ktree 变化的主要驱动因素。我们进行了一项韧皮部解剖学研究,并计算了生长在不同气候条件下的三个年龄组树木的 Ktree,这些树木的纬度梯度从南到北。我们发现,在生长旺盛的松树(25-80 岁)中,Ktree 保持在同一水平,但在树龄较大的松树(180-190 岁)中则有所增加,这可能反映了树木地上部分和地下部分源汇关系的变化。由于韧皮部解剖结构和树高的协调变化,在不同气候条件下生长的同一树龄组的树木表现出相似的 Ktree 值。一般来说,树高对 Ktree 的负面影响会被韧皮部宽度(或树干直径)和筛孔直径的正面影响所抵消。但生长在泰加亚区北部向苔原过渡地带的幼树是个例外,其 Ktree 是该树龄组中最高的,甚至超过了中龄树的 Ktree。
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Estimation of phloem conductance at tree level in young, middle-aged and old-aged Scots pine trees growing in different climatic conditions in boreal forests.

In forests, a significant proportion of the carbon fixed by trees during photosynthesis is transported belowground along the conducting phloem, so variations in phloem anatomy can lead to variations in transport capacity. Phloem conductance at tree level (Ktree) is also affected by tree height. Both the phloem anatomy and the tree size change during ontogeny, and also differ under different environmental conditions. The goal of our work was to identify the main drivers of variation in Ktree in Scots pine trees growing in natural boreal forests. We conducted a phloem anatomical study and calculated Ktree in trees of three age groups growing in different climatic conditions along a latitudinal gradient from south to north. We found that Ktree was maintained at the same level in actively growing pine trees (25-80-years-old) but increased in old-aged trees (180-190-years-old), possibly reflecting the shift in source-sink relationships of aboveground and belowground parts of trees. Trees of the same age group growing in different climatic conditions demonstrated similar values of Ktree due to coordinated changes in the phloem anatomy and the tree height. In general, the negative influence of tree height on Ktree is offset by the positive influence of phloem width (or trunk diameter) and sieve cell diameter. The exception was young trees growing in the transition zone of the northern taiga subzone to the tundra, where Ktree was the highest in its age group and even exceeded Ktree of middle-aged trees.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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