江苏省滨海盐土潮土化过程中水溶性硼的迁移特征

MIGRATION CHARACTERISTICS OF WATER-SOLUBLE BORON IN SEASHORE SALINE SOIL OF JIANGSU PROVINCE DURING DESALINIZATION

在沿海地区自潮间带至海堤内老垦区采集了重盐土至潮土系列18个剖面115个土样,研究了土壤盐分和水溶性硼之间的关系.研究表明:1.水溶性硼随盐分下降而减少;2.水溶性硼的减少滞后于盐分的淋失;3.水溶性硼在土壤中易于移动,但其迁移能力小于C1一;4.植物的吸收和土壤有机质、铁铝等三氧化物的吸持作用是导致水溶性硼淋失滞后于盐分的原因.江苏沿海土壤一般水溶性硼含量充足,但有的盐渍化较重的土壤上可能有硼的毒害问题。少数潮土上对缺硼敏感的作物则可能存在缺硼的问题.

115 strata of 18 profiles were collected in coastal region, with the soil ranging from strongly saline to alluvial ones and covering from the tide zone to old reclamation area within dyke. The relationship between salt and water-soluble boron content was analysed. Results indicate: (1)the contents of water-soluble boron decrease with desalinization; (2)water-soluble boron lessens behind salt leaching, (3)water-soluble boron in soils is easy to move, but its migration capability is lower than chlorine; and (4)boron uptake by plants and its absorption by soil organic matter and Fe-and Al-ox-ides lead to water-soluble boron leaching behind soil salt.The saline soils along the sea coast in this area contain adequate boron with some strongly saline soils possessing excessive boron which has poisoning effects on the average plant and withafew alluvial soils possessing inadcquate boron which also has unfavourable influences on some sensitive plants.