干旱区生态环境知识资源中心(Arid): Porosity Effects on Red to Far-Red Ratios of Light Transmitted in Natural Sands: Implications for Photoblastic Seed Germination

Arid

DOI	10.1117/12.2532495
	Porosity Effects on Red to Far-Red Ratios of Light Transmitted in Natural Sands: Implications for Photoblastic Seed Germination
	Baranoski, Gladimir V. G.; Kimmel, Bradley W.; Varsa, Petri; Iwanchyshyn, Mark
通讯作者	Baranoski, GVG (corresponding author), Univ Waterloo, David R Cheriton Sch Comp Sci, Nat Phenomena Simulat Grp, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada.
会议名称	Conference on Remote Sensing for Agriculture, Ecosystems, and Hydrology XXI held at SPIE Remote Sensing
会议日期	SEP 09-11, 2019
会议地点	Strasbourg, FRANCE
英文摘要	Seed germination corresponds to the first and crucial stage of a plant's life cycle. It is directly affected by water availability and soil characteristics, notably porosity. The seeds of many plant species are known to be photoblastic, i.e., their germination is also significantly affected by light exposure. A comprehensive understanding about the interconnected effects of these abiotic factors on seed germination is essential for the success of a broad range of applied research initiatives in agriculture and ecology. These initiatives include, for example, studies involving the germination of stress-adapted seeds in arid regions, like perennial desert habitats and desertified landscapes, and the germination of weed seeds in arable fields that may be covered by sand-textured soils (commonly referred to as natural sands). The germination of photoblastic seeds depends not only on the amount, but also on the spectral quality of the impinging light. This radiometric parameter can be expressed in terms of the ratio between red and far-red light reaching these seeds. In this research, we unveil the impact of variations in the porosity of sand-textured soils on their red to far-red ratios of transmitted light. Although one may expect that porosity can affect these ratios and, consequently, the germination of photoblastic seeds in natural sands, no systematic study about these putative connections has been reported in the literature to date. To some extent, this can be attributed to testing limitations posed by the actual handling of these granular materials, such as grain breakage and pore space disturbance, during investigations based on traditional experimental procedures. Moreover, the scant available information on these connections has been mostly derived from analyses performed on laboratory-prepared samples, which often present morphological characteristics that conspicuously differ from those of naturally-occurring deposits of these soils. In order to overcome these constraints, we employ an in silico investigation framework to carry out controlled light transmission experiments considering realistic characterizations of dry and water-saturated samples of natural sands. This framework is supported by measured spectral data and the use of a first-principles light transport model that explicitly accounts for the particulate structure of these materials. Our in silico experimental results provide a comprehensive depiction of the changes in the red to far-red ratios of light transmitted through natural sand layers of variable thickness due to variations on their porosity. Moreover, they also show that these changes are markedly modulated by the presence of water in these layers. Thus, our findings establish a predictive relationship between porosity and the light-elicited germination of photoblastic seeds in sand-textured soils subject to distinct degrees of water saturation. Accordingly, they are expected to contribute to the development of innovative technologies aimed at the predictive assessment (in situ or remote) of the compound impact of these abiotic factors on seed germination. These technologies, in turn, are likely to lead to new cost-effective solutions for ongoing challenges in agriculture (e.g., crop yield enhancement) and ecology (e.g., invasive plant detection and vegetation restoration), particularly with respect to regions susceptible to extreme environmental conditions.
英文关键词	soil sand porosity water saturation transmittance red to far-red ratio germination photoblastic seed
来源出版物	REMOTE SENSING FOR AGRICULTURE, ECOSYSTEMS, AND HYDROLOGY XXI
ISSN	0277-786X
EISSN	1996-756X
出版年	2019
卷号	11149
ISBN	978-1-5106-3002-4
出版者	SPIE-INT SOC OPTICAL ENGINEERING
类型	Proceedings Paper
语种	英语
收录类别	CPCI-S
WOS记录号	WOS:000528893300020
WOS关键词	DESERT DUNES ; SOIL ; PENETRATION ; REFLECTANCE ; QUALITY
WOS类目	Agronomy ; Environmental Sciences ; Remote Sensing ; Optics ; Water Resources
WOS研究方向	Agriculture ; Environmental Sciences & Ecology ; Remote Sensing ; Optics ; Water Resources
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/370075
作者单位	[Baranoski, Gladimir V. G.; Kimmel, Bradley W.; Varsa, Petri; Iwanchyshyn, Mark] Univ Waterloo, David R Cheriton Sch Comp Sci, Nat Phenomena Simulat Grp, 200 Univ Ave West, Waterloo, ON N2L 3G1, Canada
推荐引用方式 GB/T 7714	Baranoski, Gladimir V. G.,Kimmel, Bradley W.,Varsa, Petri,et al. Porosity Effects on Red to Far-Red Ratios of Light Transmitted in Natural Sands: Implications for Photoblastic Seed Germination[C]:SPIE-INT SOC OPTICAL ENGINEERING,2019.