磷对褐土中锌镉次级吸附和解吸影响  

Effect of different P contents on Zn & Cd secondary adsorption and desorption in cinnamon soil

作　　者：崔海燕[1,2] 介晓磊[1,3] 刘世亮[1] 刘芳[1] 化党领[1] 陈娇君[1] 刘忠珍[4] 

机构地区：[1]河南农业大学资源与环境学院//河南省高校农业资源与环境工程技术研究中心,河南郑州450002 [2]济源职业技术学院,河南济源454650 [3]郑州牧业工程高等专科学校,河南郑州450008 [4]广东省农业科学院土壤肥料研究所,广东广州510640

出　　处：《生态环境学报》2010年第8期1969-1973,共5页Ecology and Environmental Sciences

基　　金：河南省自然科学基金项目(0511031400;2008A208014)

摘　　要：通过吸附和解吸试验,研究了不同磷吸附量石灰性褐土对锌镉次级吸附和解吸的影响。结果表明,次级吸附锌和镉对不同吸附量磷土壤的磷解吸量随磷吸附量的增加而增加,而磷解吸量随次级吸附后锌、镉浓度的增加而降低,即随锌镉添加量的增加,磷的有效性有所降低。土壤对锌的次级吸附量和吸附率随磷吸附量的增加先降低后升高,并随添加镉浓度的增加而降低,解吸量和解吸率随磷吸附量的增加而增加,说明在正常施磷范围内,增加磷的施用量能提高土壤中锌的有效性,同时,土壤对高浓度锌的次级吸附率小于低浓度锌的次级吸附率,而土壤对高浓度锌的解吸量和解吸率要远大于对浓度锌的解吸量和解吸率;土壤对镉的次级吸附量、吸附率和解吸量、解吸率都随着磷吸附量的增加而增加,且吸附量随添加镉的量增加而增加,但镉次级吸附量和吸附率随添加锌浓度的增加而减小,解吸量和解吸率却增大,说明在磷吸附量相同的条件下,添加锌促进了镉的有效性。The paper studied on the effects of different P adsorption contents soil on Zn Cd secondary adsorption and desorption in cinnamon soil.The results showed that the P desorption amounts increased with P adsorption amounts increased after secondary adsorption Zn Cd,but the P desorption amount decreased with secondary adsorption Zn Cd amount increased,so it could say that P availability decreased with added Zn Cd amount increased.The zinc secondary adsorption amount and adsorption rate decreased first and then increased with the P adsorption amount increased,and it decreased with added Cd quantity increase.And zinc desorption amount and desorption rate increased with P adsorption quantity increased.It could explain that during the normal P added amount,increased the phosphorus usage could improve the zinc availability in the soil.Meanwhile,the secondary adsorption rate of high concentration Zn treatments was less than that of the low concentration Zn treatments,while the Zn desorption amount and desorption rate of high concentration Zn treatments was more higher than that of low concentration Zn treatments.The Cd secondary adsorption amount,adsorption rate and desorption amount,desorption rate increased with the P adsorption quantity increased,and adsorption amount increased with added Cd quantity increased.But Cd secondary adsorption amount and adsorption rate decreased with added Zn quantity increased,while its desorption amount and desorption rate increased.It could explain that when P adsorption amount was the same,increased Zinc added amount could improve Cd availability.

关 键 词：褐土 磷 锌 镉 次级吸附 解吸 

分 类 号：X131.3[环境科学与工程—环境科学]