环渤海平原区土壤盐分分布特征及影响因素分析

通过环渤海低平原区2010年4-5月份采集的70组0-60cm土样和水样的全盐量、八大离子和pH值的测试数据,查明了环渤海低平原强蒸发条件下土壤盐分空间特征,并对影响因素进行了相关分析。结果表明:土壤盐分与浅层地下水埋深之间表现为线性负相关,相关系数为0.7312;土壤盐分与地下水矿化度之间可以用指数函数关系进行拟合,决定系数为0.73-0.76;在其他因素不变的情况下,土壤含盐量与蒸发量之间的关系为线性正相关,在土壤积盐因素中有17.3%与蒸发量有关;在浅层地下水埋深较大的中西部地区,两者之间表现为线性负相关,相关系数为0.7021;在浅层地下水埋深较小的滨海平原,两者之间表现为线性正相关,相关系数为0.6035;土壤自身的理化性质对盐分的滞留和阻隔作用同样重要。在空间分布上,随着自西向东浅层地下水埋深逐渐变小、矿化度逐渐增高、降水量越来越大和蒸发量的变化,土壤盐分逐渐增高的趋势也验证了土壤盐分与上述因素之间的相关性。

Analysis of soil salinity distribution and influencing factors in area around Bohai sea

70 groups of soil and water samples were collected in March 4-5,2010 in the low plains of the Bohai Sea,the depth of soil is 0-60cm.Through testing the whole salt,eight ions and PH,we obtained the spatial characteristics of soil salinity under conditions of strong evaporation in the area,and analyzed the relevant factors.The results showed that soil salinity and shallow groundwater shows the negative linear correlation and the correlation coefficient is 0.7312;the relationship between the soil salinity and groundwater salinity can be fitted with exponential function and the coefficient of determination is 0.73-0.76.The relationship between the evaporation and soil salinity is linear correlation.The evaporation occupies 17.3% for the salt accumulation;in central and western regions of the shallow groundwater area,the relation between evaporation and salinity shows linear correlation and the correlation coefficient is 0.6035;Physical and chemical properties of the soil itself and the barrier effect of salt retention are equally important.With the shallow depth of groundwater from west to east is gradually becoming smaller,salinity gradually increases