厦门岛西海岸低地城市土壤盐分特征

福建厦门城市绿化受到过高的土壤含盐量的影响．为了减少土壤盐分过高对绿化植物生长的负面影响。我们对厦门岛西海岸市区绿地28个土壤剖面总盐、Na^ 、Cl^-含量及其变化情况进行了研究．结果表明：厦门岛西海岸绿地土壤次生盐渍化问题突出，土壤平均含盐量为1．86，变化范围为0．28～9．33，有70％左右的土壤剖面发生不同程度的次生盐渍化．表层(0-20cm)、中层(20-40cm)和底层(40-60cm)土壤平均含盐量分别为1．67、1．88和1．97。这说明从整体上来讲厦门岛西海岸市区绿地土壤处于脱盐状态．但这并不排除局部地点的积盐状态；土壤属NaCl型盐渍土。总盐中78％以上由Na^ 和Cl^-组成．这必须引起园林绿化部门的足够重视．

Properties of Salt of the Urban Soil from Western Coast of Xiamen

The landscaping trees in Xiamen,Fujian were influenced by the excessive salt in the soil.To minimize the negative effects of excessive salt in the soil on trees,we made an investigation on the salt contents and its changes.The contents of Na~+,Cl~- and total soluble salt (TSS),in the 28 urban soil profiles from western coast area of Xiamen Island were investigated in this paper.The results showed that there was an outstanding secondary salinization in the urban soil of the western area of Xiamen Island.These had a mean TSS 1.86 and a range 0.28 to 9.33,with some 70% of the samples secondarily salinized.The mean TSS for the 0~20 cm soil,20~40 cm soil and 40~60 cm soil was 1.67,1.88 and 1.97,respectively.This showed that the soil was desalinized as a whole,despite certain salt accumulation occurred in some places.This salinization was caused mainly by NaCl,Na~+ and Cl~- accounted for about 78% of TSS.The relative departments of landscape greening must be think much of this outstanding secondary salinization.