三峡库区消落带干湿交替表层沉积物磷分布特征  

Phosphorus Distribution Characteristics in Dry-wet Alteration Sediment of Fluctuation Zone in Three Gorges Reservoir Area

作　　者：曹琳[1] 吉芳英[2] 

机构地区：[1]招商局重庆交通科研设计院有限公司环境工程所,重庆400067 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045

出　　处：《地球与环境》2013年第2期126-131,共6页Earth and Environment

基　　金：科学技术部中德三峡库区水环境污染过程控制与安全保障技术研究合作项目(2007DFA90660);教育部科技创新工程重大项目培育资金项目(708071)

摘　　要：通过研究分析经历完整反季节干湿交替周期的三峡库区消落带沉积物中磷的赋存形态及含量变化,揭示了消落带沉积物磷的源/汇转化趋势。结果表明:三峡库区消落带本底土壤、覆水沉积物以及落干沉积物无机形态磷分布均呈现一致规律,即钙磷>闭蓄态磷>铝磷>铁磷>可交换态磷,反映出三峡库区短期反季节干湿交替对无机形态磷分布规律影响不大。消落带反季节干湿交替有利于表层沉积物中活性较高的有机磷、活性磷累积,有利于相对稳定的闭蓄态磷、钙磷释放。Analyses of content changes of phosphorus were made on sediments of Three Gorges Reservoir Area（TGRA） based on the time period of an entire anti-seasonal dry-wet cycle,in order to reveal the source-sink alternation of phosphorous in the fluctuating zone.The results show that the inorganic phosphorus distribution exhibited the same pattern in soils,submerged sediment and exposed sediment in TGRA,which means the content of different forms of phosphorous ranks as follows：calcium bounded phosphorus（Ca-P） occlude phosphorus（O-P） aluminum bounded phosphorus（Al-P） iron bounded phosphorus（Fe-P） exchangeable phosphorus（Ex-P）.It also signifies that short-term anti-seasonal wet-dry alternation in TGRA has little impact on the inorganic phosphorus distribution.Besides,it is found that the anti-seasonal dry-wet alternation is conductive to accumulate relatively active formations,for instance,Ac-P and Or-P,while to discharge relatively stable formations such as O-P and Ca-P.

关 键 词：磷 沉积物 三峡库区 消落带 干湿交替 

分 类 号：X142[环境科学与工程—环境科学]