Leaf turgor loss point varies among tree species, habitats, and seasons in a bottomland hardwood forest

IF 2.1 3区农林科学 Q2 FORESTRY Trees Pub Date : 2024-01-20 DOI:10.1007/s00468-023-02483-5

Alexandra M. Eisley, Brett T. Wolfe

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Key message

Tree species in a temperate floodplain forest had leaf turgor loss point values similar to those of upland forest trees, suggesting physiological drought tolerance in this generally non-water-limited system.

Abstract

Leaf turgor loss point (TLP) is a key plant trait associated with drought tolerance. In the bottomland hardwood (BLH) forests that grow in floodplains of the southeastern USA, drought stress is generally low but may increase with climate change. To address drought tolerance among BLH trees, we measured TLP among 20 species in a BLH forest in Louisiana, USA. We tested whether (1) TLP is higher in BLH tree species than in upland temperate-zone trees; (2) lower TLP is associated with higher drought tolerance among BLH species; (3) TLP drops during the growing season within BLH trees; and (4) within species, TLP is lower in more water limited, non-flooded BLH habitats than in seasonally flooded habitats. Among BLH tree species, TLP was −2.23 ± 0.28 (mean ± SD) and, contrary to our hypothesis, weakly positively correlated with drought tolerance. Within BLH species, TLP was lower in non-flooded habitats than seasonally flooded habitats and TLP decreased between the early and late growing season, more so in the non-flooded habitat. Overall, our results show that TLP among BLH trees is relatively low and plastic for a system that is generally not water limited, which may contribute to drought tolerance in future scenarios.

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底层硬木森林中不同树种、不同栖息地和不同季节的叶片张力损失点各不相同

摘要关键信息温带洪泛平原森林中的树种的叶片张力损失点值与高地林木的叶片张力损失点值相似，表明在这种一般不受限于水的系统中具有生理耐旱性。摘要叶片张力损失点（TLP）是与耐旱性相关的一个关键植物性状。在生长于美国东南部洪泛平原的底地硬木（BLH）林中，干旱压力通常较低，但随着气候变化可能会增加。为了解决底地硬木林中树木的耐旱性问题，我们测量了美国路易斯安那州底地硬木林中 20 个物种的 TLP。我们测试了（1）BLH 树种的 TLP 是否高于高地温带树木；（2）在 BLH 树种中，较低的 TLP 是否与较高的耐旱性相关；（3）在 BLH 树种的生长季节，TLP 是否会下降；以及（4）在同一物种中，水量更有限的非淹没 BLH 栖息地的 TLP 是否低于季节性淹没的栖息地。在BLH树种中，TLP为-2.23 ± 0.28（平均值 ± SD），与我们的假设相反，与耐旱性呈弱正相关。在BLH树种中，非淹水生境中的TLP低于季节性淹水生境中的TLP，并且TLP在生长季节早期和晚期之间有所下降，在非淹水生境中下降幅度更大。总之，我们的研究结果表明，对于一个通常不受限于水的系统来说，BLH 树木的 TLP 相对较低且可塑性较强，这可能有助于提高未来的抗旱能力。

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来源期刊

Trees 农林科学-林学

CiteScore

4.50

自引率

4.30%

发文量

113

审稿时长

3.8 months

期刊介绍： Trees - Structure and Function publishes original articles on the physiology, biochemistry, functional anatomy, structure and ecology of trees and other woody plants. Also presented are articles concerned with pathology and technological problems, when they contribute to the basic understanding of structure and function of trees. In addition to original articles and short communications, the journal publishes reviews on selected topics concerning the structure and function of trees.