山西省不同地区褐土对磷素的吸附特征  

Phosphorus Adsorption Characteristics in Different Areas of Cinnamonic Soil of Shanxi Province

作　　者：邹慧芳 李丽君 刘平 白光洁 武文丽 吕薇 ZOU Huifang;LI Lijun;LIU Ping;BAI Guangjie;WU Wenli;LYU Wei(College of Biological Engineering,Shanxi University,Taiyuan 030006,China;Institute of Agricultural Environmentand Resources,Shanxi Academy of Agricultural Sciences,Taiyuan 030031,China)

机构地区：[1]山西大学生物工程学院,山西太原030006 [2]山西省农业科学院农业环境与资源研究所,山西太原030031

出　　处：《山西农业科学》2019年第8期1399-1404,1410,共7页Journal of Shanxi Agricultural Sciences

基　　金：科技部国家重点研发项目(2016YFD0800105-5);山西省财政支农项目(2016zzcx-13,2015zzcx-13)

摘　　要：为了合理施用磷肥,减少农田土壤磷素流失风险,通过室内等温吸附解吸试验研究山西省境内太原市小店区、运城市永济市、长治市长子县3个地区不同土层褐土对磷的吸附、解吸特征,并在初始外源磷质量浓度为100mg/L时,研究土壤对磷的吸附动力学特征。结果表明,不同地区的不同土层褐土对磷的吸附量及解吸量均随初始外源磷质量浓度的增加而增大,吸附量随土壤深度的增加而增大,而解吸量则随土壤深度的增加而减小。不同地区的不同土层褐土对磷的吸附过程与Langmuir方程拟合良好;拟合参数最大吸附量(Qmax)、表面吸附系数(K)、最大缓冲容量(MBC)最大值均出现于长子县褐土。小店区、永济市、长子县0~20cm土层Qmax值分别为740.74,781.25,787.40mg/kg;20~40cm土层Qmax值分别为757.58,793.65,806.45mg/kg;40~60cm土层Qmax值分别为769.23,806.45,813.01mg/kg。不同地区的不同土层褐土对磷等温吸附结果均可与准二级动力学很好地拟合;吸附平衡时土壤对磷的吸附量qe最大值出现于长治市长子县褐土40~60cm土层土壤,最小值出现于太原市小店区褐土0~20cm土层土壤;准二级动力学模型速率常数k值的最大值、最小值分别出现于永济市40~60,0~20cm土层土壤。由此可知,长子县褐土对磷有较强的吸附能力,而小店区褐土对磷的吸附能力相对较弱。在种植过程中,应根据当地土壤对磷的吸附能力,合理使用磷肥,减少土壤磷素流失风险。To rationally apply phosphate fertilizer and reduce the risk of phosphorus loss in farmland soil,the adsorption and desorption characteristics of phosphorus in different cinnamonic soil layers which came from Xiaodian district of Taiyuan city,Yongji city of Yuncheng city,and Zhangzi county of Changzhi city were studied with isothermal adsorption and desorption test.The adsorption and desorption characteristics of phosphorus in cinnamonic soil in three regions and different soil layers in Shanxi province were studied by means of indoor isotherm adsorption desorption.The adsorption kinetics of phosphorus wes studied,when the initial exogenous phosphorus concentration was 100 mg/L.The results showed that the adsorption amount and desorption amount of phosphorus in different soil layers increased with the increasing of initial exogenous phosphorus concentration,and the adsorption amount increased with the increasing of soil depth,while the desorption amount decreased with the increasing of soil depth.The adsorption process of phosphorus in cinnamonic soil from different regions and different soil layers was well fitted to the Langmuir equation.The maximum values of Qmax,K and MBC appeared in soil of Zhangzi county.The Qmax values of 0-20 cm soil layers in Xiaodian district of Taiyuan city,Yongji city and Zhangzi county were 740.74,781.25,787.40 mg/kg,respectively,the Qmax values of 20-40 cm soil layers were 757.58,793.65,806.45 mg/kg,respectively,the Qmax values of the 40-60 cm soil layer were 769.23,806.45,813.01 mg/kg,respectively.The isothermal adsorption results of phosphorus in different regions and different soil layers well fitted with quasi-secondary kinetics.The maximum value of qe appeared in the 40-60 cm soil layer of cinnamonic soil in Zhangzi county,and the minimum value appeared in 0-20 cm soil layer of cinnamonic soil in Xiaodian district of Taiyuan city.The maximum and minimum values of k value appeared in 40-60 cm and 0-20 cm soil layers in Yongji city,respectively.It could be seen that the cinnamoni

关 键 词：吸附量 磷 吸附解吸 吸附动力学 

分 类 号：S153[农业科学—土壤学]