Photosynthetic acclimation, leaf turnover and growth in tree seedlings suddenly exposed to gaps in Jamaican montane rainforest

IF 1 4区环境科学与生态学 Q4 ECOLOGY

Journal of Tropical Ecology Pub Date : 2024-03-21 DOI:10.1017/s0266467424000051

Tom Ball, Edmund Tanner

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Abstract

Mature leaves of tree seedlings were exposed to high light in four experimental gaps in the Jamaican upper montane rainforest (UMRF). Two of the six species studied were light-demanders: Alchornea latifolia and Clethra occidentalis. Two were gap-favoured: Pittosporum undulatum (an invasive) and Palicourea alpina (a subcanopy shrub). One was intermediate: Hedyosmum arborescens, and one was shade-tolerant: Guarea glabra. After five months, the following significant changes occurred in shade leaves that were exposed to gaps (‘shade-to-gap’ leaves; values as % of those in the pre-gap shade): maximum rate of photosynthesis + 40% (Alchornea), +35% (Clethra), −34% (Pittosporum), +72% (Palicourea); dark respiration +120% (Alchornea), +140% (Clethra), +60% (Pittosporum), +233% (Palicourea), +175% (Hedyosmum), +100% (Guarea); leaf thickness +18% (Alchornea), +18% (Clethra), +14% (Palicourea); leaf mass per unit area +18% (Alchornea), +15% (Pittosporum). Leaves produced in the gaps were (as a percentage of total live leaf number) 74% (Alchornea), 71% (Clethra), 50% (Pittosporum), 71% (Palicourea), 62% (Hedyosmum) and 50% (Guarea). Photosynthetic rates of leaves produced in the gaps were 53–120% higher than ‘shade-to-gap’ leaves. Overall, shade leaves on the three native, more light-demanding species (Alchornea, Clethra and Palicourea) showed photosynthetic acclimation, while the more shade-tolerant species (Hedyosmum and Guarea and Pittosporum undulatum) showed little acclimation in shade-to-gap leaves.

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牙买加山地雨林中突然暴露在间隙中的树苗的光合适应、叶片更替和生长情况

在牙买加上山地热带雨林（UMRF）的四个实验间隙中，树苗的成熟叶片暴露在强光下。所研究的六个物种中有两个是需光植物：Alchornea latifolia 和 Clethra occidentalis。两个物种喜间隙：Pittosporum undulatum（一种入侵植物）和 Palicourea alpina（一种亚冠层灌木）。一种处于中间位置：Hedyosmum arborescens，一种耐阴：Guarea glabra。五个月后，暴露在间隙中的遮荫叶片（"遮荫-间隙 "叶片；数值为间隙前遮荫叶片的百分比）发生了以下显著变化：光合作用最大速率 +40%（Alchornea）、+35%（Clethra）、-34%（Pittosporum）、+72%（Palicourea）；暗呼吸 +120%（Alchornea）、+140%（Clethra）、+60%（Pittosporum）、+233%（Palicourea）、+175%（Hedyosmum）、+100%（Guarea）；叶片厚度 +18%（Alchornea），+18%（Clethra），+14%（Palicourea）；单位面积叶片质量 +18%（Alchornea），+15%（Pittosporum）。间隙中长出的叶片（占总活叶片数的百分比）分别为 74%（Alchornea）、71%（Clethra）、50%（Pittosporum）、71%（Palicourea）、62%（Hedyosmum）和 50%（Guarea）。隙间叶片的光合率比 "荫间隙 "叶片高 53-120%。总体而言，三种对光照要求较高的本地物种（Alchornea、Clethra 和 Palicourea）的阴生叶显示出光合适应性，而较耐阴的物种（Hedyosmum、Guarea 和 Pittosporum undulatum）的阴生叶几乎没有显示出光合适应性。

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来源期刊

Journal of Tropical Ecology 环境科学-生态学

CiteScore

2.10

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： Journal of Tropical Ecology aims to address topics of general relevance and significance to tropical ecology. This includes sub-disciplines of ecology, such as conservation biology, evolutionary ecology, marine ecology, microbial ecology, molecular ecology, quantitative ecology, etc. Studies in the field of tropical medicine, specifically where it involves ecological surroundings (e.g., zoonotic or vector-borne disease ecology), are also suitable. We also welcome methods papers, provided that the techniques are well-described and are of broad general utility. Please keep in mind that studies focused on specific geographic regions or on particular taxa will be better suited to more specialist journals. In order to help the editors make their decision, in your cover letter please address the specific hypothesis your study addresses, and how the results will interest the broad field of tropical ecology. While we will consider purely descriptive studies of outstanding general interest, the case for them should be made in the cover letter.