title: Spatial variability of soil salinity in coastal saline soil at different scales in the Yellow River Delta, China.
abstract: The objectives of this study were to explore the spatial variability of soil salinity in coastal saline soil at macro, meso and micro scales in the Yellow River delta, China. Soil electrical conductivities (ECs) were measured at 0-15, 15-30, 30-45 and 45-60 cm soil depths at 49 sampling sites during November 9 to 11, 2013. Soil salinity was converted from soil ECs based on laboratory analyses. Our results indicated that at the macro scale, soil salinity was high with strong variability in each soil layer, and the content increased and the variability weakened with increasing soil depth. From east to west in the region, the farther away from the sea, the lower the soil salinity was. The degrees of soil salinization in three deeper soil layers are 1.14, 1.24 and 1.40 times higher than that in the surface soil. At the meso scale, the sequence of soil salinity in different topographies, soil texture and vegetation decreased, respectively, as follows: depression >flatland >hillock >batture; sandy loam >light loam >medium loam >heavy loam >clay; bare land >suaeda salsa >reed >cogongrass >cotton >paddy >winter wheat. At the micro scale, soil salinity changed with elevation in natural micro-topography and with anthropogenic activities in cultivated land. As the study area narrowed down to different scales, the spatial variability of soil salinity weakened gradually in cultivated land and salt wasteland except the bare land.
authors.affiliation: National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, No.61 Daizong Street, Tai'an, 271018, China.
authors.forename: Zhuoran
authors.initials: Z
authors.lastname: Wang
authors.affiliation: National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, No.61 Daizong Street, Tai'an, 271018, China. zhaogx@sdau.edu.cn.
authors.forename: Gengxing
authors.initials: G
authors.lastname: Zhao
authors.affiliation: National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, No.61 Daizong Street, Tai'an, 271018, China.
authors.forename: Mingxiu
authors.initials: M
authors.lastname: Gao
authors.affiliation: National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Shandong Agricultural University, No.61 Daizong Street, Tai'an, 271018, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Chang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D005843:Geography; D045483:Rivers / Q000737:chemistry*; D054712:Salinity; D012965:Sodium Chloride / Q000032:analysis*; D012987:Soil / Q000737:chemistry*
chemical_list: D012987:Soil; D012965:Sodium Chloride
keywords: Macro scale; Meso scale; Micro scale; Soil salinity; Spatial variability; The Yellow River Delta