Seasonal variability and cloud impacts in diffuse ratio, clearness index, and spectral characteristic of solar radiation in a temperate monsoon region

IF 1.7 4区 环境科学与生态学 Q3 ECOLOGY
Amila Nuwan Siriwardana, Atsushi Kume
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Abstract

Solar radiation (SR) dynamics significantly influence plant growth, development, and ecosystems, serving as a primary energy source and an essential environmental signal. Plants sense SR through photoreceptors, with the ratios between specific wavelength ranges being particularly significant. Therefore, we refer to these as critical wavelength ratios (CWRs). The diffuse fraction of solar radiation (DF) is a key factor shaping light quality and distribution within the plant canopy. To evaluate the potential effects of DF and CWRs on plants in an outdoor environment, we analyzed 1 year of SR spectral data collected using a rotating shadow-band spectroradiometer in Fukuoka, Japan. Cloudy or partly cloudy skies dominated throughout the year. The ratios of UV-A/UV-B, red (R)/blue (B), and R/green (G) increased in winter and decreased in summer. In contrast, the ratios of photosynthetically active radiation (PAR)/global solar radiation (GSR), UV/GSR, UV/PAR, B/G, R/far-red, and UV-B/B increased during summer and decreased in winter. Most CWRs were significantly correlated with the DF. The clearness index (CI) exhibited a strong correlation with DF and CWRs. A synergistic effect of air mass (AM), atmospheric water vapor pressure (VP), and CI on specific CWRs was revealed. Future climate change-driven increases in VP and DF, coupled with reductions in CI, are expected to trigger complex changes in plant growth and flowering by altering light signals and enhancing photosynthesis through diffuse light fertilization. Integrating VP, AM, DF, and CI dynamics into climate models could enhance predictions of atmospheric, ecological, and plant physiological responses.

Abstract Image

温带季风区太阳辐射散射比、清晰度指数和光谱特征的季节变率和云影响
太阳辐射作为主要的能量来源和重要的环境信号,对植物的生长发育和生态系统有着重要的影响。植物通过光感受器感知SR,特定波长范围之间的比值尤为显著。因此,我们称之为临界波长比(CWRs)。太阳辐射散射系数(DF)是影响植物冠层内光质量和光分布的关键因素。为了评估DF和CWRs对室外环境下植物的潜在影响,我们分析了在日本福冈使用旋转阴影波段光谱仪收集的1年SR光谱数据。全年多云或部分多云的天气。UV-A/UV-B、红(R)/蓝(B)、R/绿(G)的比值冬季升高,夏季降低。光合有效辐射(PAR)/总太阳辐射(GSR)、UV/GSR、UV/PAR、B/G、R/远红和UV-B/B的比值在夏季呈上升趋势,冬季呈下降趋势。大多数CWRs与DF显著相关。清晰度指数(CI)与DF和CWRs有较强的相关性。空气质量(AM)、大气水汽压(VP)和CI对特定CWRs具有协同效应。未来气候变化驱动的VP和DF的增加,加上CI的减少,预计将通过改变光信号和通过漫射光施肥增强光合作用,引发植物生长和开花的复杂变化。将VP、AM、DF和CI动态整合到气候模型中可以提高对大气、生态和植物生理反应的预测。
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来源期刊
Ecological Research
Ecological Research 环境科学-生态学
CiteScore
4.40
自引率
5.00%
发文量
87
审稿时长
5.6 months
期刊介绍: Ecological Research has been published in English by the Ecological Society of Japan since 1986. Ecological Research publishes original papers on all aspects of ecology, in both aquatic and terrestrial ecosystems.
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