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.
出处
《土壤学报》
CAS
CSCD
北大核心
1993年第4期416-422,共7页
Acta Pedologica Sinica
关键词
滨海盐土
脱盐过程
水溶性氟
含量
Coastal saline soils
Desalinization
Water-soluble F^-
Watersoluble Ca^(++)
pH value
