Soil Column Sample Height Influences Soil Spectral Reflectance in Laboratory Experiment
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Soil salt inversion models are basically calibrated in laboratory experiments and validated in the field. Unified standard about settings of soil column sample height (SCSH) is lacking. The main objective of this study was to identify the optimal SCSH for soil salinity estimation. Three types of soil particle size simulating soil roughness and ten different heights of soil column samples from 1 to 10 cm were designed, according to the previous studies, and soil spectral reflectance was measured before and after irrigation with deionized water. The spectrum, soil water content and soil salt amount (SA) on the surface of various soil column SHs in complex soil water system and soil roughness conditions were compared. Two-way ANOVA was applied to assess the effect of soil particle and salt crystallization on the spectral reflectance. Results indicated that SCSH caused distinct difference in salt accumulation at the surface (critical height is 6 cm) and in soil spectral reflectance (critical height is 2 cm) at the final state. Soil roughness influenced spectra significantly between the low-height samples (1–5 cm) and was covered up with SA at the surface between the high samples (6–10 cm). Considering the actual condition in the field, greater than 6 cm was deemed as an exact selection for saline soil in the region (Na2SO4). These results were critical to model soil salinity in laboratory experiment based on hyperspectral reflectance.
KeywordsSalt-affected soil Soil column sample height Hyperspectral reflectance Laboratory experiment
This study was supported by the Science Foundation of Jiangsu Normal University (16XLR036), the National Key Research and Development Program of China (2016YFC0501200), and the National Natural Science Foundation of China (41571210, 41807001, 41671395). We thank the staff at Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences and Wulanwusu Agricultural Meteorological Station for their facilities and support.
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