利用光学测量探究温室条件下苗圃盆栽红叶石楠幼苗的高效灌溉期

Forests Pub Date : 2024-07-25 DOI:10.3390/f15081303
U. Jeong, Seung Hyun Han, Dohee Kim, Sohyun Kim, Eun Ju Cheong
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引用次数: 0

摘要

由于具有木材和植树造林的价值,韩国对山毛榉的需求量很大。然而,它在繁殖和收集幼苗生产的生理信息方面面临挑战。特别是,水分供应对幼苗生产至关重要。因此,根据光学测量建立有效的灌溉制度至关重要。光学测量方法有望实现无损、快速,并减少育苗系统中的劳动力消耗。本研究利用植被指数(VIs)、叶绿素荧光(FL)成像和热成像(TH)等光学测量方法,探索了干旱胁迫下温室条件下一龄幼苗的高效灌溉期,并进行了补水实验。结果表明,所有幼苗在没有灌溉的情况下都能存活到第 4 天(D4)(土壤含水量:5.3%)。第 6 天补水后,83.33% 的秧苗存活到第 14 天。根据光学测量结果,在所有干旱处理盆中,热成像参数、PRI(光化学反射指数)和 Fm(暗适应状态下的最大荧光)在 D6 天均表现出敏感的胁迫反应。其中,热成像被认为最有可能解决温室中的局限性并加以利用。本研究的结果有望为未来开发智能苗圃系统以实现高效灌溉提供基础数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Exploring the Efficient Irrigation Period for Larix kaempferi Seedlings in Nursery Pots in Greenhouse Conditions Using Optical Measurements
Larix kaempferi is in high demand in Korea due to its value in timber and afforestation. However, it faces challenges in terms of propagation and the collection of physiological information for seedling production. In particular, moisture supply is crucial in seedling production. Therefore, establishing efficient irrigation regimes based on optical measurements is essential. Optical measurement methods are expected to be non-destructive, rapid, and reduce labor consumption in nursery systems. This study applied optical measurements using vegetation indices (VIs), chlorophyll fluorescence (FL) imaging, and thermal (TH) imaging to explore the efficient irrigation period for one-year-old Larix kaempferi seedlings in greenhouse conditions under drought stress and perform rehydration experiments. It was observed that all the seedlings survived without irrigation until day 4 (D4) (soil moisture content: 5.3%). Upon rehydration on D6, 83.33% of the seedlings survived until D14. According to the optical measurement results, the TH parameters, PRI (photochemical reflectance index), and Fm (maximum fluorescence in a dark-adapted state) showed sensitive stress responses in all drought treatment pots on D6. Among them, thermal imaging was found to have the highest potential for addressing limitations and being utilized in the greenhouse. The results of this study are expected to provide foundational data for the development of smart nursery systems for efficient irrigation in the future.
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