绿狐尾藻人工湿地底泥中磷形态分布特征研究

发布时间：2018-03-08 16:39

本文选题：磷形态　切入点：底泥　出处：《环境污染与防治》2017年10期 　论文类型：期刊论文

【摘要】：构建处理不同负荷养殖废水的绿狐尾藻人工湿地,采集湿地表层(0~5cm)、中层(5~10cm)和底层(10~20cm)底泥样品,测定TP及有机磷含量,并用五步化学分级提取法将无机磷逐级提取为水溶性磷、铝结合态磷(Al-P)、铁结合态磷(Fe-P)、闭蓄态磷(O-P)和钙结合态磷(Ca-P),对比了各形态无机磷水平和垂直分布差异。结果表明,绿狐尾藻人工湿地表层底泥TP质量浓度在167~965mg/kg,其中有机磷占TP的66.0%(质量分数,下同)~79.2%。各形态无机磷的含量排序为:O-PFe-PCa-PAl-P可溶性磷。不同形态无机磷随着底泥深度的增加变化不同,总体来看,从表层到中层,Al-P、Fe-P和Ca-P含量呈现降低趋势,中层到底层无明显变化规律;低负荷湿地中,O-P含量随深度增加逐渐降低,而在中、高负荷湿地中O-P含量随深度增加逐渐增加。相关分析结果显示,Al-P、Fe-P、O-P含量与底泥pH和溶解性有机碳(DOC)呈显著或极显著正相关,说明磷在底泥中的行为易受底泥pH和DOC影响。
[Abstract]:The constructed wetland was constructed to deal with different loads of culture wastewater. The surface layer of the wetland was 0 ~ 5 cm ~ (5 cm), the middle layer was 5 ~ 10 cm) and the bottom layer was 10 ~ 10 ~ 20 cm). The contents of TP and organic phosphorus were determined, and the inorganic phosphorus was extracted to water soluble phosphorus step by step by five-step chemical gradation extraction method. Aluminum-bound phosphorus (Al-Pu), iron-bound phosphorus (Fe-P), closed storage phosphorus (O-P) and calcium bound phosphorus (Ca-Pn) have been compared in the horizontal and vertical distribution of inorganic phosphorus. The mass concentration of TP in the surface sediment of the constructed wetland was 167g / kg, and organic phosphorus accounted for 66.0% of TP (mass fraction, 79.2%). The content of inorganic phosphorus in each form was in the order of soluble phosphorus, and different forms of inorganic phosphorus varied with the increase of sediment depth. As a whole, the contents of Al-P Fe P and Ca-P decreased from the surface to the middle layer, but there was no obvious change from the middle layer to the bottom layer, while the content of O-P decreased gradually with the increase of depth in the low-load wetland, while in the middle, the content of O-P decreased gradually with the increase of depth. The results of correlation analysis showed that there was a significant or extremely significant positive correlation between O-P content and sediment pH and dissolved organic carbon (DOC) in high load wetland, indicating that phosphorus behavior in sediment was easily affected by pH and DOC.
【作者单位】：中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室长沙农业环境观测研究站;华中农业大学资源与环境学院;湖南农业大学生物科学技术学院;
【基金】：国家重点研发计划项目(No.2016YFE0101100) 中国科学院先导专项(No.XDB15020401)
【分类号】：X52

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