黄河三角洲土壤盐碱化对团聚体稳定性的影响

打开文本图片集

中图分类号：S156.4+3 文献标识码：A 文章编号：1007-0435（2026）01-0154-09

Abstract： To investigate the physicochemical properties and stability of soil aggregates and their relationships under differentsaline-alkali gradients in the coastal saline-alkali land ofthe Yelow River Delta，this study combined field sampling with laboratoryanalysis to determine the nutrient content，particle size distribution，and stability indicators of soil aggregates across varying gradients. The results showed that under severe saline-alkali conditions，the carbon-to-nitrogen ratio，ammonium nitrogen，and available phosphorus content in <0.25mm aggregates significantly decreased （ .P<0.05 . Similarly，nitrate nitrogen and ammonium nitrogen content in 1⋅2mm aggregates were also significantly lower under high salinity stress （ ⋅P<0.05 .The geometric mean diameter and mean weight diameter of aggregates significantly reduced in severe saline-alkali conditions compared to moderate conditions （P<0.05） ），while the proportion of 1-2mm aggregates increased with increasing salinity.Corelation analysis revealed that salinity was significantly negatively correlated with total carbon and total nitrogen across all aggregate sizes ⋅P<0.01） ，and significantly positively correlated with the carbon-tonitrogen ratio（ P<0.01） .Under high saline-alkali conditions，available phosphorus，ammonium nitrogen， nitrate nitrogen，and aggregate stability indicators were all significantly negativelycorelated with saltcontent （ .P<0.01 .In conclusion，the degree of saline-alkali stress significantly influenced the physicochemical properties and structural stability of soil aggregates，with high salinity potentiall leading to nutrient lossand structural degradation.

Key words： Yellow River Delta;Saline-alkaline soil;Soil aggregates;Stability;Soil physicochemical properties

土壤盐碱化已成为世界性难题，全球范围内超过4.24亿 hm2 表层土 （0～30cm 和8.33亿 hm2 深层土 （30～100cm 受到盐碱化的影响[1]。（剩余17858字）