摘要
通过吸附和解吸试验,研究了富啡酸(Fulvic acid,FA)对石灰性潮土中磷吸附-解吸的影响,并进行了吸附富啡酸和磷后对锌次级吸附-解吸的影响。结果表明:同时吸附不同磷和富啡酸后,土壤对磷的吸附量随磷初始浓度的增加而增加,而随富啡酸吸附初始浓度的增加而降低;石灰性潮土磷等温吸附曲线用Langumir方程式描述时,土壤对磷的吸附反应常数K、最大吸附量Xm、最大缓冲容量K×Xm均随富啡酸初始浓度的增加而降低;KNO3、KOH、HCl对吸附磷的解吸量所占比例及磷的总解吸量均随富啡酸浓度的增加而增加。土壤对Zn2+的吸附率随磷和富啡酸吸附初始浓度的增加而降低;而其解吸率随磷和富啡酸吸附浓度的增加而增加,说明磷和富啡酸减少了土壤对Zn2+的吸附,且增加了其在土壤中的解吸量。所以,石灰性潮土中富啡酸提高了土壤中磷的有效性,而且磷和富啡酸提高石灰性土壤中锌的有效性。
The importance of P and heavy metal interaction have extended from nutrition field to maintain environmental safety field and human health. To elucidate the interaction mechanism of P and Zn, fulvic acid（FA） in soil system, the effect of different FA adsorption contents soil on P adsorptiondesorption, and the soil secondary adsorptiondesorption Zn after the soil adsorbed FA and P in calcareous Chao soil were studied. The results showed that, the P adsorption amount increased with P adsorption initial concentration increasing, and it decreased with FA adsorption initial concentration increasing when P and FA adsorbed at the same time. When isothermal adsorption curve of phosphate in calcareous Chao soil described with Langumir equation, the adsorption reaction constant （K）, the most adsorption quantity （Xm）, and the most buffer capacity（K x Xm ） were reduced with FA adsorption initial concentration increasing. The ratio of P desorption of KNO3, KOH,HC1 and total desorption amount to P adsorption amount increased with FA concentration increasing. The Zn^2＋adsorption ratio decreased with P and FA adsorption initial concentration increasing, but it desorption ration increased with P and FA adsorption initial concentration increasing. It indicated that P and FA reduced the Zn^2＋ absorption by soil, and increased the Zn^2＋ desorption. So, the FA improved the P availability, and P and FA improved Zn availability in calcareous Chao soil.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第3期530-537,共8页
Journal of Agro-Environment Science
基金
河南省自然科学基金项目(0511031400,2008A208014)
关键词
石灰性潮土
富啡酸
磷
锌
吸附
解吸
calcareous Chao soil
fulvic acid（FA）
P
Zn
adsorption
desorption
