滨海湿地原生灌草群落土壤养分与盐分关系

Relationship between soil nutrient and salinity of native shrub-herb communities in the coastal wetland

通过灌草群丛划分、土壤采样以及室内测定、数理统计等方法, 分析了黄河三角洲原生湿地灌草群落土壤的养分、盐分分布特征及相互关系, 发现原生灌草群落土壤可溶性盐的垂直分布变异性较大, 其中, 碱蓬群丛与柽柳群丛土壤可溶性盐分布具有较强的表聚性, 而土壤有机质含量表现为芦苇群丛〉 柽柳群丛〉 碱蓬群丛, 且灌草群落中土壤C/ N 值都大于5, 表明其有机质腐殖化程度较高.另一方面, 土壤全氮与有机质存在明显的线性正相关; 而土壤全盐与有机质、全氮之间存在明显的倒数关系, 表明全盐对二者的制约作用, 其中15- 20 g/ kg 的土壤盐分范围对应的是土壤全氮、有机质由迅速减少向缓慢减少的变化趋势.研究结果可以为盐碱土改良提供重要参考.

The distribution characteristics of soil nutrient and soil salinity of native shrub-herb communities in the Yellow River Delta wetland and their relationship were investigated using the methods of shrub-herb association classification,soil sampling,laboratory analysis,and mathematical statistics.The results showed(1)the vertical variation of soil soluble salt differs significantly,and the distribution of soil salinity of the Suaeda glauca association and Tamarix chinensis association shows the trend of surficial accumulation;(2)the order with high to low of soil organic matter content is Phragmites communis association,Tamarix chinensis association,and Suaeda glauca association;(3)the C/N rate of the shrub-herb communities is higher than 5,which suggests high humification degree of soil organic matter;(4)soil total nitrogen has a positive correlation with organic matter,while soil total salinity has an inverse correlation with organic matter and total nitrogen,which indicates the restriction of total salinity on organic matter and total nitrogen;and(5)the soil salinity range from 15 to 20g/kg corresponds to the transition for the rapid to slow reduction of soil total nitrogen and organic matter.The results can provide reference for the improvement of saline soil.