Spatiotemporal Dynamics, Zoning, and Sustainable Utilization of Soil Salinization in the Yellow River Delta

doi:10.19657/j.geoscience.1000-8527.2024.070

Abstract

Abstract:

It is of strategic significance in the Yellow River Delta (YRD), whether it is ecological protection or agricultural development.The layout of the agricultural structure based on the salinity of soil resources is the prerequisite for the high-quality development of agriculture in the YRD.Based on soil sampling in 4 areas with different sedimentary histories in the YRD and along with statistical data, the spatial distribution characteristics and seasonal dynamics of soil salinity characteristics in this area were investigated.Various land types were involved, such as coastal beaches, saline-alkali wastelands, forests and grasslands, and agricultural land.The results showed that the farmland productivity in the YRD was significantly lower than the average level of Shandong Province, and the grain yield on the north bank of the Yellow River was significantly lower than that on the south bank.The spatial difference of soil salt content is obvious.The soil conductivity can reach as high as 20 mS/cm in the tidal flat, and the farmland far away from the coast is about 0.5 mS/cm.The longitudinal distribution of salinity is mostly upper-accumulated or average distributed, accounting for 78.6%.Affected by rainfall and evaporation, the shallow soil salinity and pH value have seasonal changes, and the increase in vegetation coverage can weaken the seasonal changes in soil salinity.The soil organic matter content (OM) is generally low, most of the OM in the soil within 1m of depth is between 0.4% and 0.8%, and the organic matter of the surface soil is slightly higher.In farmland soils far away from the coast, the organic matter content in the surface layer has increased significantly, reaching more than 1.5% or 2.0%.Given the temporal and spatial changes of soil salinity characteristics and new national strategic needs, further suggestions for the development and utilization of the Yellow River Delta were proposed.The study provide a scientific reference for the green development of saline-alkali land, the efficient use of agricultural water and soil resources, and the healthy development of grass and animal husbandry in this area.

Key words: Yellow River Delta, soil resource, spatial and temporal dynamics of saline property, grass husbandry in saline area

CLC Number:

WANG Bing, DOU Wenjun, CHEN Jie, CHEN Jingwen, LAI Jianbin. Spatiotemporal Dynamics, Zoning, and Sustainable Utilization of Soil Salinization in the Yellow River Delta[J]. Geoscience, 2025, 39(02): 456-466.

Figures/Tables 7

Fig.1 Course evolution of the Yellow River and the sampling sites distribution in this study

Fig.2 Comparison of land productivity in the Yellow RiverDelta

Fig.3 Variation of soil EC at 22 sites along 4 sampling routes in three typical periods

Fig.4 Spatial distribution patterns of soil EC at 5 depths during 3 typical periods

Fig.5 Main ion composition of soil salinity

Fig.6 Soil pH distribution along soil profile at each sampling site in three typical periods

Fig.7 Spatial distribution of soil organic matter at 5 depths in the Yellow River Delta (a) 0~20 cm; (b)20~40cm; (c)40~60 cm; (d)60~80 cm; (e)80~100 cm

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