摘 要：
以幕阜山5个海拔高度的土壤粘粒复合体为对象,用等温平衡吸附法研究了磷吸附量随加入磷浓度和平衡时间改变的变化规律。结果表明;①随着海拔高度增加,土壤粘粒的最大吸磷量由2.48 mg·g~(-1)依次增大到9.38 mg·g~(-1),达到饱和吸附所需加入的磷浓度增高,最大解吸磷量却逐渐降低,磷的解吸率减小。②根据土壤粘粒吸附磷速率的不同可将供试样品的吸磷过程划分为3个阶段,在24小时内的吸磷量占480小时吸磷量的72%～85%。海拔越高的土壤粘粒,快反应速率越高,缓慢吸附的时间越长。同一样品经不同时间吸附的磷解吸率变幅不大。③供试粘粒吸磷量随平衡液浓度和平衡时间的变化特征可用Langmuir,Temkin,Freundlich,Elovich等方程描述,相关系数在0.94～0.99之间,达极显著水准。④不同海拔土壤在磷吸附量、吸附速率和吸附强度等方面的不同,主要与土壤粘粒复合体中吸磷载体的含量差异有关。
译 名：
THE CHARACTERISTICS OF PHOSPHORUS ADSORPTION FOR MUFU MOUNTAIN SOIL CLAYS
作 者：
Hu Hongqing Xu Fenglin Li Xueyuan (Huazhong Agricultural University, Wuhan 430070)
关键词：
mountain soil, phosphorus, adsorption characteristics
摘 要：
The amout of phosphorus adsorption for Mufu mountain soil clays at a series of added phosphorus concentration and equilibrium time was determined. The results indicated: (1) The phosphorus maxium adsorption capacity (Xm) of clay for examined soils is increased, whereas its desorption quantity and ratio is reduced with the increasing of altitude. The value of Xm for red soil and mountain shrubby-meadow soil is 2.48 and 9.38 mgP/g clay, respectively. (2) Kinetics of phosphorus adsorption show that the rate for phosphorus adsorption and the time for equlibrium increase with the increasing of altitude. The adsorption process can be divided into three stages according to the rate of phosphorus adsorption. The amount of phosphorus adsorption during 24 hours is as 72%～85% much as that during 480 hours. For the same clay sample, the desorption ratio of adsorbed phosphorus during different period has little changes. (3) The Langmuir. Freundlich. Temkin. and Elovich equations can be used to describe the relation between phosphorus adsorption capacity and equilibrium solution phosphorus concentration of equilibrium time. Their correlationship coefficients are up to 0.94～0.99. (4) There is significant difference in the phosphorus adsorption capacity, rate and intensity, owing to the different contents of phosphorus adsorption carriers among examined soil clays.
