Study on Spatial and Temporal Distribution of Soil Salinity in Cotton Field in the Yellow River Delta

Liu Yang; Jiang Defeng; Zou Xiaoxia

doi:10.14083/j.issn.1001-4942.2017.05.014

Abstract：The Yellow River delta is an important reserve cultivated land resources in China.To make clear the spatial variability of soil salinity is the basis of exploiting land resources in this area.In this study,the profile and spatial distribution characteristics of soil salinity in 0 ～ 100 cm soil layer in the typical land use type of cotton field were studied with sampling from inland to the coast along the Yellow River.The results found that the soil salinity along the Yellow River from inland to coastal areas was gradually increasing,which was closely related to the soil forming time,the distance from the sea and human activities.The study area was mainly light saline soil,and under the influence of artificial cultivation management,the spatial variability of 0 ～ 60 cm soil layer tended to be consistent,which was smaller than that of 60 ～ 100 cm soil layer.Surface accumulation was the main soil salinity profile type in the study area and mainly distributed in the coastal area of the study area.Along with the increase of human cultivation time and the distance from the sea,the soil salinity profile type was gradually transformed into the oscillating average type and bottom accumulation type.It showed that reasonable land management could reduce the soil salinization to some extent.In the late planting management,we should refer to the isogram of soil salinity in the study area and take appropriate farmland management ways to reduce the soil salinization and prevent the occurrence of secondary salinization.