Forests, Free Full-Text
Por um escritor misterioso
Last updated 06 julho 2024
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Thermal dissipation of excess excitation energy is an important photoprotective mechanism that plants have evolved to cope with surplus illumination. However, light-energy-partitioning dynamics in an exotic sand-dune willow (Salix psammophila) commonly used in restoring and/or stabilizing sand lands in northwestern China is largely unknown. In this study, chlorophyll fluorescence (ChlF) of photosystem II (PSII) was continuously monitored in situ in Salix psammophila to investigate plant acclimation processes driven by excessive solar radiation and extreme air temperatures (Ta). As part of a heat-regulation mechanism, energy partitioning is shown to vary with prevailing environmental conditions. In this investigation, energy absorbed during periods of moderate photosynthetically active radiation (PAR < 1200 μmoL·m−2·s−1) was largely allocated towards photochemistry (ΦPSII) with nominal amounts to thermal dissipation through reversible thermal dissipation (ΦNPQr). In extremely high solar radiation (PAR > 1500 μmoL·m−2·s−1) or in a cold temperature (Ta < 0 °C), more energy was dissipated by way of non-regulated thermal energy (Φf,D) and sustained thermal dissipation (ΦNPQs), leading to non-reversible photoinhibition or photodamage. This was mainly as a result of the low utilization and high absorption of light energy by PSII under cold conditions and physiologically-induced vulnerability. It was concluded that Salix psammophila had a clear tolerance to high temperatures and moderate solar radiation, but tended to be more vulnerable to high solar radiation and cold temperature. Based on species sensitivity to extreme environmental conditions, practical application and extension of Salix psammophila for land-restoration purposes should be approached cautiously, especially in high-latitude or high-altitude desert ecosystems commonly affected by events of high solar radiation and cold temperature.
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Forests, Free Full-Text
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Frontiers Intact Forests in the United States: Proforestation
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Forests An Open Access Journal from MDPI
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Enchanted Forests: The Poetic Construction of a World before Time, Sax
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Chart: Forest Loss Still High in 2022
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Better Place Forests Memorial Trees for Cremation Ashes
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Reforestation US Forest Service
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Cartoon Forest Vector Art, Icons, and Graphics for Free Download
State of the World's Forests 2020
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Free] Download Enchanted Forests by Astrid V.J. Full Version by
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International Year of Forests -- An Ongoing Forest Lesson
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How are forests framed? An analysis of EU forest policy
U.S. Forest Service-Modoc National Forest
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Deforestation and Forest Degradation, Threats
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Review: The Forest app helps you go phone-free by planting trees
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