水位调控对河口沉积物磷赋存及生物可利用性的影响

汤显强; 吴 敏

doi:10.11988/ckyyb.20140539

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长江科学院院报 ›› 2015, Vol. 32 ›› Issue (12) : 8-13. DOI: 10.11988/ckyyb.20140539

水资源与环境

水位调控对河口沉积物磷赋存及生物可利用性的影响

汤显强^1a,1b,2,吴敏^1a,1b,2

作者信息 +

Impacts of Water Level Regulation on Estuary Sediment PhosphorusStorage and Bioavailability

TANG Xian-qiang^1,2,3,WU Min^1,2,3

Author information +

文章历史 +

摘要

以丹江口库区神定河河口持续淹水和间歇淹水积物为对象,探讨水位调控前后不同淹水沉积物的理化性质、磷赋存及生物可利用性变化规律。实验持续3个水位调控循环,水位变化速率分别为0,3,6 cm/d。结果表明:水位调控总体上促使沉积物OM流失和pH值升高。与对照速率(0 cm/d)相比,3 cm/d和6 cm/d水位变化使无定形铁氧化物分别增加了185.56%~204.92%(持续淹水沉积物)和185.28%~228.76%(间歇淹水沉积物)。水位调控后,持续淹水和间歇淹水沉积物的可交换态磷(Ex-P)、铝结合态磷(Al-P)、铁结合态磷(Fe-P)、钙结合态磷(Ca-P)和总磷(TP)含量均上升,OM流失降解和闭蓄态磷(O-P)活化转化造成有机磷(Org-P)和O-P含量降低。水位调控有利于Org-P和O-P转化为活性磷,因此应将二者也视作沉积物生物可利用性磷组分。

Abstract

Continuously submerged and intermittently submerged sediments collected from Shendinghe River estuary of Danjiangkou reservoir,were employed to conduct the dynamic water level(WL) regulation experiments with 3 rates of change of water level (0 cm.d^-1,3 cm.d^-1 and 6 cm.d^-1).The whole experiments lasted three WL regulating cycles (nearly four months) and each single cycle included four WL dynamic phases:decline,stable,ascend and re-stable.The results show that:WL regulation promotes OM loss of sediment and results in the increase of pH value.When compared with the data without WL regulated control,3 cm.d^-1 and 6 cm.d^-1 WL regulations lead to the increase of 185.56%-204.92%(continuously submerged sediments) and185.28%-228.76%(intermittently submerged sediments) in concentrations of amorphous iron oxides,respectively.Furthermore,after WL regulation, concentrations of exchangeable phosphorus (Ex-P),aluminum bounded phosphorus (Al-P),iron bounded phosphorus (Fe-P),calcium bounded phosphorus (Ca-P) and total phosphorus (TP) increase in intermittently submerged and continuously submerged sediments,whereas OM loss,occluded phosphorus (O-P) activation and transformation,greatly contribute to the decline of organic phosphorus (Org-P) and O-P in sediment.With respect to the activation of Org-P and O-P under WL regulation,both of the two phosphorus fractions should be categorized into bio-available phosphorus components.

导出引用

汤显强,吴敏. 水位调控对河口沉积物磷赋存及生物可利用性的影响[J]. 长江科学院院报. 2015, 32(12): 8-13 https://doi.org/10.11988/ckyyb.20140539

TANG Xian-qiang,WU Min. Impacts of Water Level Regulation on Estuary Sediment PhosphorusStorage and Bioavailability[J]. Journal of Changjiang River Scientific Research Institute. 2015, 32(12): 8-13 https://doi.org/10.11988/ckyyb.20140539

中图分类号： S151.93

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