摘要
应用同位素32P示踪法,对陕西省四种主要土壤(黄绵土、黑垆土、土、黄褐土)三种处理状态下的研究得出:(1)磷素很难“穿透”土柱,阻滞因子R均大于1;富含粘粒和碳酸钙的土壤,去除CaCO3,可使阻滞因子R减小,说明CaCO3是与土壤磷反应的主要基质。(2)温度升高有利于土柱“阻滞”磷素,证实了磷素与土壤反应是吸热反应;(3)CXTFIT程序用于计算磷运移参数具有可行性,且该程序计算的参数是根据穿透曲线BTC拟合而得,更能反映实际情况。
By using the 32P isotopic tracer
method, experiments have been conducted toinvestigate phosphorus transport in three different
forms of four types of soils inShaanxi Province. It is found that: (1) Phosphorus can hardly
break through the soilcolumn in experiment as the retardation factor, R, is larger than 1 in most
cases,particularly in soils rich in clays and calcium carbonate. After eliminating CaCO3 fromthe
soil, the value of R will decrease. (2) While raising temperature makes the valueof R increase
and the value of diffusion-dispersion coefficient, D, decrease; and (3) Itis viable to use the
CXTFIT program for calculation of phosphorus transportparameters.
出处
《土壤学报》
CAS
CSCD
北大核心
1999年第1期75-82,共8页
Acta Pedologica Sinica
关键词
同位素示踪
穿透曲线
阻滞因子
磷
土壤
Breakthrough
curve (BTC), CXTFIT program, Isotopic tracer,Retardation factor (R)