浙江省农业土壤酸缓冲性能的研究

A study on acidic buffer capacity of agricultural soils in Zhejiang Province

用模拟方法研究了浙江省40个土属的农业土壤对酸的缓冲性能及影响因素.结果表明,供试土壤对酸的缓冲作用可分为3段,相应的pH范围大致可分为＞6,3～6和＜3,pH在3～6的范围内缓冲作用较弱.不同土壤对酸的缓冲容量和缓冲强度有很大的变化,成土母质是最主要的影响因素,酸的缓冲容量和缓冲强度一般是:滨海沉积物发育土壤＞石灰岩发育土壤＞湖积物发育土壤＞河流冲积物发育土壤＞山地丘陵酸性岩残坡积母质发育土壤.酸的缓冲容量和缓冲强度主要受土壤中CaCO3含量和阳离子交换量控制.

The acidic buffer capacity of 40 soil samples collected from Zhejiang province was measured using a laboratory method, and the factors affecting the capacity was also identified. The results showed that the buffer curve of softs to acidity could be divided three ranges： pH 〉 6.0, pH 6.0- 3.0, and pH 〈 3.0. Among the three ranges, the range with pH 6.0- 3.0 had the weakest acidic buffer intensity. The acidic buffer capacity and intensity varied with soils, and was significandy affected by soil parent materials. The acidic buffer capacity of the soils developed from different parents followed the order： marine sediments 〉 limestone 〉 lacustrine deposit 〉 river alluvium 〉 acid rock. Soil acidic buffer capacity and intensky were mainly controlled by soil CaCO3 content and cation exchangeable capacity.