caa a22 4500 445300329 CHVBK 20180317142555.0 cr unu---uuuuu 170323e20101001xx s 000 0 eng 10.1007/s11430-010-4049-1 doi (NATIONALLICENCE)springer-10.1007/s11430-010-4049-1 Using soil surface gray level to determine surface soil water content [Elektronische Daten] [YuanJun Zhu, YunQiang Wang, MingAn Shao] How to determine surface soil water content (SWC) quickly and accurately is fundamental in studying eco-hydrological processes and their modeling. Here we use laboratory experiments to determine surface SWC using soil surface gray level (SGL) values. A negatively exponential relationship exists between SGL and SWC, i.e., SGL increases with the decrease of SWC. SGL can be estimated based on initial SGL value (surface gray level when SWC=0), SWC, and a surface roughness coefficient characterized by mean soil particle size. The variation range of SGL was larger than that of SWC, indicating that changes in SWC were enhanced in SGL, and that SGL would thus be sensitive to changes in soil water. At the 95% confidence level, SWC can be determined by using the relationship between SWC and SGL established by the experiments. The determination of SWC has a high precision when SWC was between dry and saturated. Science China Press and Springer-Verlag Berlin Heidelberg, 2010 Loess Plateau nationallicence soil water nationallicence remote sensing nationallicence surface roughness nationallicence Zhu YuanJun State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut Wang YunQiang State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut Shao MingAn State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut Science China Earth Sciences SP Science China Press 53/10(2010-10-01), 1527-1532 1674-7313 53:10<1527 2010 53 11430 https://doi.org/10.1007/s11430-010-4049-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11430-010-4049-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhu YuanJun State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut NATIONALLICENCE 700 1- Wang YunQiang State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut NATIONALLICENCE 700 1- Shao MingAn State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, 712100, Yangling, China aut NATIONALLICENCE 773 0- Science China Earth Sciences SP Science China Press 53/10(2010-10-01), 1527-1532 1674-7313 53:10<1527 2010 53 11430 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer