风沙土不同有机矿质复合体对磷的解吸特征影响  

Effect of Different Organo-mineral Complexes on Desorption Characteristic of Phosphorus on Sandy Soil

作　　者：王而力[1] 王嗣淇[1] 邱素芬[1] 

机构地区：[1]辽宁工程技术大学环境科学与工程学院,辽宁阜新123000

出　　处：《农业环境科学学报》2013年第4期741-747,共7页Journal of Agro-Environment Science

基　　金：辽宁省教育厅科研项目(20060391)

摘　　要：采用平衡解吸法研究了风沙土不同有机矿质复合体对磷的解吸特征影响。结果表明,通过过氧化氢去除腐殖质后的风沙土磷的解吸比例(Dr=0.99)大幅度增加,解吸迟滞性指数(TⅡ=0.02)显著降低,有机矿质复合体是影响磷在风沙土上固持特征的重要因素;磷在钙键和铁铝键有机矿质复合体团聚结构微孔隙中引起的团聚体结构不可逆形变是导致磷解吸比例降低、解吸迟滞性指数增大的原因之一。铁铝键有机矿质复合体除对团聚体结构形成有重要影响外,还存在铁铝氧化物及水化氧化物对磷的配位吸附作用,因而铁铝键有机矿质复合体(Dr=0.35、TⅡ=0.44)比钙键有机矿质复合体(Dr=0.62、TⅡ=0.28)对磷的固持能力强得多;考查风沙土对磷的解吸特征不但要考虑腐殖质的含量,更要考虑腐殖质的复合形态,它也是影响风沙土磷解吸特征的重要因素。钙键有机矿质复合体、铁铝键有机矿质复合体携载的吸附态磷对上覆水体的释放通量可分别按其饱和吸附量62%和35%估算。Effect of different organo-mineral complexes on desorption characteristic of phosphorus on sandy soil was investigated by batch experiment of equilibrium desorption. Results indicated that desorption ratio increased dramatically after humus was removed by H202 （Dr= 0.99 ）, and desorption hysteresis index decreased simultaneously（T 11 =0.02）. Orgauo-mineral complex was a main influencing factor in fixed and maintained characteristic of phosphorus on sandy soil. On the one hand, the irreversible transformation of aggregate structure on Fe/AI- bound or Ca-bound complex was the fundamental reason of desorption ratio decreasing and hysteresis index increasing. On the other hand, fixed and maintained capacity of Fe/Al-bound complex（Dr=0.35 ,T II =0.44） was higher than Ca-bound complex（Dr=0.62,T I1 --0.28 ）. Triva- lent iron ion was more favorable for complex structure formation than divalent calcium ion; Besides Fe/Al-bound complex had a great effect upon aggregate structure formation, there was a Fe/A1 oxide or hydration oxide coordination sorption （chemical sorption ） of phosphorus on sandy soil. Taking into account desorption characteristic was not only humus content, but also compound state of humus, it was also an impor- tant factor. When sorption capacity was regarded as a basic standard, releasing flux of adsorption state phosphorus on Ca-bound complex and Fe/Al-bound complex were also estimated in accordance with 62% and 35%.

关 键 词：风沙土 有机矿质复合体 磷 解吸分配系数 最大解吸量 解吸比例 解吸迟滞性指数 

分 类 号：X131.3[环境科学与工程—环境科学]