黄河三角洲不同植被类型下土壤pH与盐分差异分析

Characteristics of Soil pH and Salinity under the Different Vegetation Types in Yellow River Delta

在土壤样品资料的基础上,分析了黄河三角洲柽柳、碱蓬、芦苇、棉田4种植被类型下土壤pH与全盐的差异,结果表明:(1)土壤垂直剖面上,柽柳、碱蓬全盐为表聚型,其中,柽柳群落土壤盐分明显高于碱蓬;而pH在0~10cm的土层上表现为碱蓬>棉田地>芦苇>柽柳,柽柳群落土壤表现出全盐含量越高,pH越小的趋势。(2)土壤全盐、pH表层与深层差异显示出两种状态,一种是表层低于深层,如碱蓬、芦苇群落;另一种是表层高于深层,如柽柳群落、棉田地;而pH以棉田地为代表表层高于深层,其它3个群落土壤表层pH均低于深层。(3)变异系数表明,水平分布的表层土中全盐强变异类群是芦苇群落,这是因为芦苇群落生境的异质性较高,其pH变异相对较低;而在垂直土壤剖面上,土壤全盐及pH都以柽柳群落变异性较高,属于强变异类群,这与柽柳灌木的根际微生物活动有密切关系。

The differences of soil pH and salts in the soil sample were analyzed among tamarixchinensis, suaeda salsa, phragmitescommunis, and cotton fields. The results showed thattamarixchinensis and suaeda salsa were accumulated in the soil surface on the vertical soil profile. And the soil salts of tamarixchinensis were significantly higher than that of suaeda salsa. While pH value in 0 ？ 10cm soil layer showed as follows,suaeda salsa 〉 cotton field 〉 phragmitescommu- nis 〉tamarixchinensis. The soil salts of tamarixchinensis showed that the more total salts, the less pH. Two states of to-tal salt and pH of soil between the surface and the deep layer were revealed. One is that they arelowerinsuiface than in deep layer like suaeda salsa and phragmitescommunis. The other is that they are higher in suifacethan in deep layer like tamarixchinensis and cotton fields. However, pH showed that apart from the cotton fields, the soil pHinsuiface is lower than the deepinother three communities. Coefficients of variation showed that the horizontal distribution surface of soil to-tal salt of phragmitescommunis had the strongest variability due to the high heterogeneity of habit with relatively low vari-ability of pH. On the vertical soil profile, the soil total salt and pH of tamarixchinensis were higher with strong variation, which had close relations with the tamarix shrub rhizosphere microbial activities.