茶树根际土壤磷的解吸特性  

Desorption characteristics of phosphorus in tea tree rhizosphere soil

作　　者：杨威[1] 周卫军[1] 包春红[1] 苗霄霖[1] 胡文敏[1] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128

出　　处：《应用生态学报》2013年第7期1843-1848,共6页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(41071204)资助

摘　　要：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 （P） release process and its supply mechanism in tea tree rhizosphere soil, an exogenous P adsorption and culture experiment was conducted to study the P desorption process and characters in the tea tree rhizosphere soils having been cultivated for different years and derived from different parent materials. The least squares method was used to fit the isotherms of P desorption kinetics. There was an obvious difference in the P desorption process between the rhizosphere soils and non-rhizosphere soils. The P desorption ability of the rhizosphere soils was significantly higher than that of the non-rhizosphere soils. As compared with non-rhizosphere soils, rhizosphere soils had higher available P content, P desorption rate, and β value （desorbed P of per unit adsorbed P）, with the average increment being 5.49 mg·kg-1 , 1.7%, and 24.4% , respectively. The P desorption ability of the rhizosphere soils derived from different parent materials was in the order of granite 〉 quaternary red clay 〉 slate. The average available P content and P desorption ability of the rhizosphere soils increased with increasing cultivation years.

关 键 词：根际土壤 磷解吸 种植年限 成土母质茶树 

分 类 号：S571.1[农业科学—茶叶生产加工]