Wang Zhuoran, Zhao Gengxing, Gao Mingxiu, Chang Chunyan
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.
Environ Monit Assess. 2017 Feb;189(2):80. doi: 10.1007/s10661-017-5777-x. Epub 2017 Jan 25.
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.
本研究的目的是在中国黄河三角洲地区，从宏观、中观和微观尺度上探究滨海盐土土壤盐分的空间变异性。于2013年11月9日至11日，在49个采样点测量了0 - 15厘米、15 - 30厘米、30 - 45厘米和45 - 60厘米土层深度的土壤电导率（EC）。基于实验室分析，将土壤电导率转换为土壤盐分。我们的研究结果表明，在宏观尺度上，各土层土壤盐分含量高且变异性强，随着土壤深度增加，含量升高且变异性减弱。在该区域从东向西，距离海洋越远，土壤盐分越低。三个较深土层的土壤盐渍化程度分别是表层土壤的1.14倍、1.24倍和1.40倍。在中观尺度上，不同地形、土壤质地和植被下土壤盐分的排序依次降低，具体如下：洼地＞平地＞小土丘＞河漫滩；砂壤土＞轻壤土＞中壤土＞重壤土＞黏土；裸地＞碱蓬＞芦苇＞白茅＞棉花＞水稻＞冬小麦。在微观尺度上，土壤盐分随天然微地形中的海拔以及耕地中的人为活动而变化。随着研究区域缩小到不同尺度，除裸地外，耕地和盐碱荒地中土壤盐分的空间变异性逐渐减弱。
