江苏省滨海盐土向潮土演化过程中水溶性氟含量变化原因的探讨  

DISCUSSION ON MECHANISM OF VARIATIONS IN CONTENT OF WATER-SOLUBLE FLUORINE DURING DESALINIZATION OF COASTAL SALINE SOILS OF JIANGSU PROVINCE

作　　者：潘宏[1] 陈邦本[1] 方明[1] 

机构地区：[1]南京农业大学海涂研究室,江苏农科院土肥所210014

出　　处：《土壤学报》1993年第4期416-422,共7页Acta Pedologica Sinica

摘　　要：江苏滨海盐土向潮土演化过程中,水溶性F^-含量经历了由少变多,再由多变少的过程。水溶性氟含量变化受控于水溶性Ca^(++)变化(F^-=a+bCa^(++-1/2),同时,由于土壤胶体和溶液中OH^-与F^-的相互交换作用,因此水溶性F^-与水溶性Ca^(++)互为增减、而与pH值同步增减。对水溶性F^-含量可能CaF_2的活度积起控制作用,而pH值的变化起叠加作用。江苏沿海土壤中影响水溶性氟含量的矿物主要是CaF_2。Water-soluble F^- in coastal saline soil of Jiangsu Province changed firstly from low to high content, then from high to low during desalinization process of the soil. Water-soluble F^- content was controlled by water-soluble Ca^(++) content (F^-=a+bCa^(++-1/2)). Becanse of the mutual exchange reaction of OH^- and F^--ion within soil colloid and solution, the water-soluble F^- content increased and decreased reciprocally with the water-soluble Ca^(++) content but simultaneously with the pH value. The mainfactor controlling the content of soluble fluorine might be the activity product of CaF_2. CaF_2 is the main solid phase controlling water-soluble F^- in the saline soils along the sea coast of Jiangsu.

关 键 词：滨海盐土 脱盐过程 水溶性氟 含量 

分 类 号：S151[农业科学—土壤学]