Non-invasive monitoring of photosynthetic activity and water content in forest lichens by spectral reflectance data and RGB colors from photographs

IF 1.9 3区 环境科学与生态学 Q3 ECOLOGY Fungal Ecology Pub Date : 2023-04-01 DOI:10.1016/j.funeco.2023.101224
Michaela Bednaříková , Yngvar Gauslaa , Knut Asbjørn Solhaug
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引用次数: 2

Abstract

There is a need for non-invasive monitoring of temporal and spatial variation in hydration and photosynthetic activity of red-listed poikilohydric autotrophs. Here, we simultaneously recorded kinetics in RGB-colors (photos), reflectance spectra, water content, maximal (FV/FM), and effective quantum yield of PSII (ΦPSII) during desiccation in foliose lichens differing in cortical characteristics and photobionts. The spectral absorbance peaks of chlorophyll a, phycocyanin, and phycoerythrin were clearly displayed at high hydration levels. Brightness and total RGB colors of the lichens strongly increased during desiccation. The normalized difference vegetation index (NDVI) efficiently estimated hydration level and ΦPSII – a proxy for lichen photosynthesis – in all species, including threatened old forest lichens. Color and reflectance indices based on green wavelengths gave good estimates of water content in cephalo- and chlorolichens, but not in cyanolichens with a wider range of photosynthetic pigments. Due to species-specific characteristics, species-wise calibration is essential for non-invasive assessments of lichen functioning.

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通过光谱反射率数据和照片RGB颜色对森林地衣光合活性和含水量的无创监测
需要对红色名录中的水化和光合活性的时间和空间变化进行无创监测。在这里,我们同时记录了不同皮层特征和光生物的对开地衣干燥过程中PSII的RGB颜色(照片)、反射光谱、含水量、最大值(FV/FM)和有效量子产率(ΦPSII)的动力学。叶绿素a、藻蓝蛋白和藻红蛋白的光谱吸收峰在高水合水平下清晰可见。地衣的亮度和总RGB颜色在干燥过程中显著增加。归一化差异植被指数(NDVI)有效地估计了所有物种的水合水平和ΦPSII——地衣光合作用的指标——包括受威胁的老森林地衣。基于绿色波长的颜色和反射率指数可以很好地估计头地衣和氯地衣的含水量,但不能很好地估算具有更广泛光合色素的蓝藻的含水量。由于物种的特殊性,物种校准对于地衣功能的非侵入性评估至关重要。
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来源期刊
Fungal Ecology
Fungal Ecology 环境科学-生态学
CiteScore
5.80
自引率
3.40%
发文量
51
审稿时长
3 months
期刊介绍: Fungal Ecology publishes investigations into all aspects of fungal ecology, including the following (not exclusive): population dynamics; adaptation; evolution; role in ecosystem functioning, nutrient cycling, decomposition, carbon allocation; ecophysiology; intra- and inter-specific mycelial interactions, fungus-plant (pathogens, mycorrhizas, lichens, endophytes), fungus-invertebrate and fungus-microbe interaction; genomics and (evolutionary) genetics; conservation and biodiversity; remote sensing; bioremediation and biodegradation; quantitative and computational aspects - modelling, indicators, complexity, informatics. The usual prerequisites for publication will be originality, clarity, and significance as relevant to a better understanding of the ecology of fungi.
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