摘要
采用同位素示踪法,模拟研究不同扰动强度对外源性磷在水体、铜绿微囊藻和底泥中迁移的影响.水体中外源性磷首先由快速的物理化学分配进入铜绿微囊藻和底泥中,然后其在水体中的迁移主要受铜绿微囊藻生长状况的影响.实验表明,当扰动强度为30r/min时,铜绿微囊藻生长得最好.单位质量铜绿微囊藻中最大外源性磷含量与扰动强度无关,但扰动能加快铜绿微囊藻对外源性磷的吸收速率.水体中溶解的外源性磷含量随时间持续下降,微囊藻的衰亡能促进水体中磷向底泥中迁移.最终绝大部分外源性磷迁移到底泥中.增加扰动能有效降低水体中溶解性磷的浓度,在扰动为30r/min时,水体中外源性磷从2.183mg/mL下降到0.0180mg/mL.
Effect of different disturbance strength on the movement of exogenous phosphorus in water, Microcystis aeruginosa and base mud was studied simulatively with the method of isotope tracer. The exogenous phosphorus entered initially into M. aeruginosa and base mud in a mode of physical chemistry distribution. Then, the movement of exogenous phosphorus in water was significantly influenced by the growth of M. aeruginosa. The test result showed that the growth of M. aeruginosa was the best at the disturbance strength of 30 r/min, while the strength had nothing to do with the maximum content of phosphorus per mg M. aeruginosa, but could increase the velocity of phosphorus adsorptionby M. aeruginosa. The content of dissoluble exogenous phosphorus in water declined with time. The decline andwithering of M. aeruginosa could promote the movement of exogenous phosphorus from water to the base mud with most of it moved finally. The concentration of dissoluble exogenous in water could be effectively decreased by increase ofdisturbance, and it decreased to 0.0180mg/L from 2.183mg/L at disturbance of 30r/min.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2002年第6期537-541,共5页
China Environmental Science
基金
中国科学院知识创新项目(KZCX2-403)
