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为了探明茶树根际土壤磷的释放过程与供应机制,采用外源磷吸附培养方法,研究了不同母质、不同种植年限茶树根际土壤磷的解吸过程与特性,并用最小二乘法进行最优函数拟合.结果表明:茶树根际土壤与非根际土壤磷的解吸过程有明显的差异.茶树根际土壤的磷解吸能力极显著高于非根际土壤;与非根际土壤相比,根际土壤的平均有效磷含量、平均解吸率和平均β值(单位吸附量中的解吸量)分别高出5.49 mg.kg-1、1.7%和24.4%.不同成土母质发育的茶树根际土壤磷解吸能力为花岗岩风化物>第四纪红色粘土>板页岩风化物.随着种植年限的延长,3种母质茶树根际土壤的有效磷与磷解吸能力均有不同程度地提高.
In order to explore the phosphorus release process and supply mechanism in the rhizosphere soil of tea plantation, the exogenous phosphorus adsorption culture method was used to study the desorption process and characteristics of phosphorus in rhizosphere soils of tea plantations with different parent materials and different planting years. The least squares The results showed that there was a significant difference in the desorption of phosphorus from rhizosphere soil and non-rhizosphere soil of tea plant.The phosphorus desorption capacity of rhizosphere soil in tea plant was significantly higher than that in non-rhizosphere soil.Compared with non-rhizosphere soil, The average effective phosphorus content, average desorption rate and average β value (desorption amount per unit adsorption capacity) of the soils were 5.49 mg.kg-1, 1.7% and 24.4%, respectively. The rhizosphere soils of tea plants with different parent materials Phosphorus desorption capacity for the granite weathering> Quaternary red clay> slate weathering compounds.With the extension of planting years, the three kinds of parental tea rhizosphere soil available phosphorus and phosphorus desorption capacity increased to varying degrees.