摘要
采用室内培养的方法,通过人为添加不同量的玉米干秸秆和磷,研究不同含磷量土壤对镉吸附解吸影响,以探讨磷—镉在土壤中的交互作用机制。结果表明,不同含磷量的土壤对不同质量浓度锌镉吸附解吸时,在低质量浓度镉(Cd3)条件下,土壤对镉的吸附量随磷质量分数的增加先升高后降低,解吸量随着土壤中磷质量分数的增加先升高后降低再升高;而在高质量浓度镉(Cd30)条件下,土壤对镉的吸附量随磷质量分数的增加逐渐升高,在相同磷水平下,随外加锌质量浓度的增加,镉的吸附量明显降低,而解吸量则逐渐升高。不同秸秆量土壤对不同质量浓度镉吸附解吸时,在Cd3条件下,土壤对镉的吸附量随秸秆加入量的增加先升高后降低,而在同一质量分数磷情况下,吸附量逐渐下降;土壤对镉的解吸量在磷质量分数为120 mg·kg-1(P2)时最低,而后随着磷质量分数的增加而增加。在同一质量分数磷水平情况下,随着秸秆添加量的增加,土壤对镉的解吸量逐渐增加。而在Cd30条件下,土壤对镉的吸附量逐渐增加,在同一磷水平情况下,土壤对镉的吸附情况是低量秸秆(C1)>高量秸秆(C2),但在磷质量分数为240 mg·kg-1(P3)水平下,不添加秸秆(C0)情况时镉的吸附量最大,而后降低。土壤对镉的解吸量随着磷含量的增加而增加。在同一磷水平情况下,随着秸秆添加量的增加,土壤对镉的解吸量逐渐增加。
For elucidate the interaction mechanism of P and Cd in soil system,the paper studied on the different phosphorus content soil to adsorption desorption cadmium by added corn straw and phosphorus cultivation indoor.The results show that,the Cd absorption amount was increased at first and then decreased with P content increased,and the desorption amount was increased at first and then decreased,and at last increased when the Cd concentration was very low（Cd3 treatment）.And when the Cd concentration was very high（Cd30 treatment）,the Cd absorption amount was increased gradually with P content increased,under the same P level,the Cd absorption amount was significantly decreased with P content increased,but the desortption amount was increased.In different straw added amount to adsorption desorption cadmium,the Cd adsorption amount was increased at first and then decreased,and under the same P level,the adsorption was decreased gradually in Cd treatment,and the Cd desorption amount was reached minimum when the P content was 120 mg·kg^-1（P2）,and then was increased with P content increased.Under the same P level,the Cd desorption amount was increased gradually with corn straw added amounts increased.But in Cd30 treatment,the Cd adsorption amount was increased gradually,And under the same P level,the sequence of Cd adsorption was C1〉 C2,the Cd adsorption was reached max.,and then decreased when no added straw in 240 mg·kg^-1（P3） level.The Cd desorption amounts was increased with P content increased,and under the same P level,the Cd desorption was increased gradually with straw added amount increased.
出处
《生态环境学报》
CSCD
北大核心
2010年第4期803-808,共6页
Ecology and Environmental Sciences
基金
河南省自然科学基金项目(0511031400
2008A208014)
关键词
褐土
磷
秸秆
镉
吸附
解吸
Cinnamon soil
phosphate
straw
cadmium
adsorption
desorption
