摘要
以圆形土柱顶部施加ＫＨ＿２ＰＯ＿４，模拟磷钾在红壤中的一维扩散迁移，并用Ｆｉｃｋ方程ｄｃ／ｄｔ＝Ｄ′·ｄ￣２ｃ／ｄｘ￣２进行描述。对分别培养了３、７、１４ｄ的土柱进行磷钾含量测定，结果表明：磷钾在供试红壤中迁移很慢，扩散系数Ｄ’值很小；钾的迁移速率稍快于磷，钾的Ｄ′值亦稍大于磷。
Phosphate and potassium one-dimensional diffusive transport in red soils was simulated with cylindrical wax column of red soils ,on the top of whick KH2PO4 was applied, and was descrebed with Fick's equation dc/dt=D'·d2c/dx2. Contents of phosphate and potassium of soil column were determined after 3,7 and l4 d incubation separatly. The results showed that transport of phosphate and potassium in red soils was very slow, the value of apparent diffusive coefficient D'was small; the rate of potassium transport was a liitle faster than which o phosphate,and the value of apparent diffusive coefficient was a little larger than which of phosphate.
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1995年第3期247-252,共6页
Journal of Huazhong Agricultural University
关键词
磷
钾
迁移
扩散系数
红壤
phosphate
potassium
transport
apparent diffusive coefficient
red soils
