沿海灌丛植被火灾后重新生长的光合作用受到刺激:水或养分供应增加?

IF 3.5 2区 农林科学 Q1 FORESTRY
Erin I E Rogers, Kazi R Mehnaz, David S Ellsworth
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引用次数: 0

摘要

火灾频发的地貌会频繁发生火灾,破坏地上生物量并改变地下土壤养分的可用性。增加叶片养分或叶片水分平衡既能减少光合作用的限制,又能促进植物的火后恢复。这些火灾反应模式通常是分开研究的,因此很少进行比较。我们假设,在严重焚烧的情况下,沿海灌丛生态系统的木本植物会比未焚烧地区具有更高的光合作用率(Anet),这是由于叶片养分和水分限制的瞬时释放,促进了焚烧后的生物量恢复。为了比较重新生长植物的这些火灾恢复机制,我们在澳大利亚悉尼北海德测量了澳大利亚原生沿海灌丛物种的叶片气体交换、叶片和土壤中氮、磷浓度以及植物气孔限制,这些数据跨越了严重火灾后一年、轻度控制火灾后七年以及任何火灾后数十年的火灾地点序列。与未燃烧的树木相比,最近的燃烧使三种树木的 Anet 增加了 20%。这些树种的叶片总氮和总磷在燃烧后分别增加了28%和50%,三种树种的叶片总氮和叶片总磷在燃烧后分别增加了28%和50%,三种树种的叶片总氮和叶片总磷在燃烧后分别增加了28%和50%。叶片 N 和 P 的增加以及叶片光合作用生化能力的提高,再加上特定树种 gs 的增加,共同促成了焚烧后光合作用速率比长期未焚烧区域的光合作用速率更高。焚烧后光合作用受刺激的原因是叶片中养分浓度(尤其是氮)的增加,以及某些物种气孔的开放。研究结果表明,随着未来火灾强度或频率的增加,焚烧后叶片生理机能的变化可能会促进物种光合作用和生长的变化。在此基础上,物种在重新生长期间的优势取决于火灾后恢复期间的养分和水分供应情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stimulated photosynthesis of regrowth after fire in coastal scrub vegetation: increased water or nutrient availability?

Fire-prone landscapes experience frequent fires, disrupting above-ground biomass and altering below-ground soil nutrient availability. Augmentation of leaf nutrients or leaf water balance can both reduce limitations to photosynthesis and facilitate post-fire recovery in plants. These modes of fire responses are often studied separately and hence are rarely compared. We hypothesized that under severe burning, woody plants of a coastal scrub ecosystem would have higher rates of photosynthesis (Anet) than in unburned areas due to a transient release from leaf nutrient and water limitations, facilitating biomass recovery post-burn. To compare these fire recovery mechanisms in regrowing plants, we measured leaf gas exchange, leaf and soil N and P concentrations, and plant stomatal limitations in Australian native coastal scrub species across a burn sequence of sites at 1 year after severe fire, 7 years following a light controlled fire, and decades after any fire at North Head, Sydney, Australia. Recent burning stimulated increases in Anet by 20% over unburned trees and across three tree species. These species showed increases in total leaf N and P as a result of burning of 28% and 50% for these macronutrients, respectively, across the three species. The boost in leaf nutrients and stimulated leaf biochemical capacity for photosynthesis, alongside species-specific stomatal conductance (gs) increases, together contributed to increased photosynthetic rates after burning compared with the long-unburned area. Photosynthetic stimulation after burning occurred due to increases in nutrient concentrations in leaves, particularly N, as well as stomatal opening for some species. The findings suggest that changes in species photosynthesis and growth with increased future fire intensity or frequency may be facilitated by changes in leaf physiology after burning. On this basis, species dominance during regrowth depends on nutrient and water availability during post-fire recovery.

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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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