洪湖沉积柱中磷形态的垂直分布及指示意义

发布时间：2018-01-18 03:07

本文关键词：洪湖沉积柱中磷形态的垂直分布及指示意义　出处：《中国环境科学》2017年04期 　论文类型：期刊论文

【摘要】：于2014年底,在洪湖中部较为稳定的区域采集了一根沉积柱,分析了沉积物中不同形态磷、总氮、有机质的含量.结果表明:沉积柱中总磷、总氮和有机质的浓度平均值超过安大略沉积物评价指南,呈现出不同的污染水平.相关性研究表明,Fe/Al-P和有机磷(OP)是总磷(TP)的主要成分.依据~(137)Cs和~(210)Pb定年结果,沉积柱中磷形态的垂直变化可以分为3个阶段:1952年前,洪湖沉积物中的Ca-P磷含量最高,其他形态的磷含量较低,说明沉积物中的磷主要来源于自然活动;1950s~1980s,沉积物中Fe/Al-P和OP含量的升高与エ农业活动的增强有关,沉积物Ca-P含量迅速降低可能与洪湖水文条件的改变有关;1980s以来,沉积物中除了Ca-P以外,其他形态的磷呈上升趋势.沉积物中不同形态的磷与洪湖地区人类活动指标(人口、粮食产量、化肥使用量和围网养殖规模)呈正相关,说明人类活动是沉积物中磷的主要输入源.
[Abstract]:In end of 2014, a sedimentary column was collected in the middle of Honghu Lake, and the contents of phosphorus, total nitrogen and organic matter in the sediments were analyzed. The mean concentrations of total nitrogen and organic matter were higher than the Ontario sediment assessment guidelines, showing different levels of pollution. Fe/Al-P and organophosphorus were the main components of the total phosphorus (TP), according to the results of 137Cs and 210Pb dating. The vertical variation of phosphorus forms in sediment column can be divided into three stages: before 1952, the phosphorus content of Ca-P in Honghu Lake was the highest, while that of other forms was lower. It shows that the phosphorus in sediment is mainly derived from natural activities. In 1950s ~ 1980s, the increase of Fe/Al-P and op contents in sediments was related to the enhancement of agricultural activities. The rapid decrease of Ca-P content in sediments may be related to the change of hydrological conditions in Honghu Lake. Since 1980's, the other forms of phosphorus in sediments, except Ca-P, have been on the rise. Different forms of phosphorus in sediments and indicators of human activities (population, grain yield) in Honghu area. There was a positive correlation between fertilizer use and scale of seine culture, indicating that human activity was the main source of phosphorus in sediment.
【作者单位】：中国地质大学(武汉)环境学院;中国地质大学(武汉)工程学院;中国地质大学(武汉)生物地质与环境地质国家重点实验室;
【基金】：国家自然科学基金青年科学基金项目(41503103) 湖北省自然科学基金面上项目(2014CFB895)
【分类号】：X524
【正文快照】： 武汉430074)湖泊中的营养物质来源于水生植物、藻类等自身活动以及非点源农业污染等外源性输入[1].1960s以前,全球范围内湖泊中的营养物质主要来源于系统自身.此后,随着经济活动的发展和人口数量的增加,湖泊中的营养物质不断升高,导致水质下降和生态系统的不断恶化[2].在人为

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