Responses to defoliation of Robinia pseudoacacia L. and Sophora japonica L. are soil water condition dependent,Annals of Forest Science

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Responses to defoliation of Robinia pseudoacacia L. and Sophora japonica L. are soil water condition dependent
Annals of Forest Science ( IF 2.5 ) Pub Date : 2022-04-07 , DOI: 10.1186/s13595-022-01136-w
Mingyan Li ₁ , Xiao Guo ₁ , Lele Liu _{2,

3} , Ning Du _{2,

3} , Weihua Guo _{2,

3} , Jian Liu ₄

Affiliation

Key message

Defoliation significantly affected biomass allocation of Robinia pseudoacacia L. and Sophora japonica L., but leaf physiology readjusted to control levels at the end of the experiment. Considering carbon or sink limitation and relative height growth rate, defoliated R. pseudoacacia grew faster than S. japonica under well-watered conditions, while defoliated S. japonica and R. pseudoacacia had similar performance under drought conditions.

Context

Climate change may result in increases of both drought intensity and insect survival, thereby affecting both exotic and native trees in warm temperate forests.

Aims

In this study, we examined the interaction effects of defoliation and drought on an exotic species Robinia pseudoacacia and a native species Sophora japonica in a warm temperate area, to provide a theoretical basis for predicting the distribution and dynamics of the two species under future climate change.

Methods

In a greenhouse, both species were exposed to three soil moisture (75%, 55%, and 35% of field capacity) and three defoliation treatments (no defoliation, 50% defoliation, and 100% defoliation). Leaf physiology, biomass, and non-structural carbohydrate were determined.

Results

Leaf physiology of defoliated trees did not differ from controls trees, but defoliated seedlings allocated relatively more resources to the leaves at the end of the experiment. In well-watered conditions, defoliated R. pseudoacacia was not carbon or sink limited and defoliated S. japonica was carbon limited, while defoliated individuals of the two species were sink limited under drought. Defoliated R. pseudoacacia grow more rapidly than S. japonica in well-watered conditions. Defoliated R. pseudoacacia had a similar growth rate to S. japonica in drought.

Conclusions

Defoliation clearly affects biomass allocation of the two species, but not leaf physiology. Considering the carbon or sink limitation, the growth of S. japonica and R. pseudoacacia may be limited by future global climate change scenarios.

中文翻译：

刺槐和国槐对落叶的反应取决于土壤水分条件

关键信息

落叶显着影响刺槐和国槐的生物量分配，但在实验结束时叶片生理重新调整至控制水平。考虑到碳或汇的限制和相对高度生长速率，在水分充足的条件下，落叶刺槐的生长速度快于日本刺槐，而在干旱条件下，落叶刺槐和刺槐的表现相似。

语境

气候变化可能导致干旱强度和昆虫存活率的增加，从而影响暖温带森林中的外来树木和本土树木。

目标

在这项研究中，我们研究了落叶和干旱对暖温带外来物种刺槐和本土物种槐花的相互作用影响，为预测未来气候变化下这两种物种的分布和动态提供理论依据。 .

方法

在温室中，两种物种都暴露于三种土壤水分（田间持水量的 75%、55% 和 35%）和三种落叶处理（不落叶、50% 落叶和 100% 落叶）。测定叶片生理学、生物量和非结构碳水化合物。

结果

落叶树的叶片生理与对照树没有差异，但落叶幼苗在实验结束时为叶片分配了相对更多的资源。在水分充足的条件下，落叶的刺槐不受碳或汇限制，落叶的日本刺槐受碳限制，而这两个物种的落叶个体在干旱条件下受碳限制。在水分充足的条件下，落叶的R. pseudoacacia比S. japonica生长得更快。在干旱条件下，落叶的R. pseudoacacia的生长速度与S. japonica相似。