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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Changes in sediment-water column phosphorus interactions following sediment disturbance
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Changes in sediment-water column phosphorus interactions following sediment disturbance

机译：沉积物扰动后沉积物-水柱磷相互作用的变化

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Stream and ditch sediments are an important part of the ecosystem that can play a pivotal role in buffering nutrient and contaminant concentrations in surface water.Removal of existing sediments and deposition of new sediments will change the physiochemical parameters controlling P transport in drainage ditches;however,these phenomena are not well documented.This study was conducted to determine the impact of severe storms on sediment P interactions with water column P in tile-fed drainage ditches within agricultural watersheds in northeast Indiana.Easily exchangeable P (MgCl_2 extractable)in ditch sediments ranged from 0.5 to 1.32 mgkg~(-1).The equilibrium P concentration (EPC_o)between the aqueous phase and sediments ranged from 0.02 to 0.11 mgL~(-1).When comparing sediment EPC_o with dissolved P concentrations in ditch water,sediments acted as a P sink in five of the seven data collection sites.The ability of the sediment to buffer water column P,as measured by the slope of the linear relation used to calculate sediment EPC_o,ranged from 2.7 to 13.8 mg P sorbed kg~(-1)sediment per unit in rngPL~(-1)in the aqueous solution.In contrast to previous studies,chemical amendments did not alter easily exchangeable P in sediments nor sediment EPC_o and the slopes observed in the linear P sorption isotherms.While chemical amendment can be used to increase P sorption by sediments and reduce exchangeable P in sediments,this showed that this practice should be targeted to times of the year when they would be the most effective.
机译：河流和沟渠沉积物是生态系统的重要组成部分，可以在缓冲地表水中的养分和污染物浓度方面发挥关键作用。去除现有沉积物和新沉积物的沉积将改变控制排水沟中P运移的理化参数;但是，本研究旨在确定强风暴对印第安纳州东北部农业流域的平铺排水沟中沉积物P与水柱P相互作用的沉积物P的影响。沟交换物中容易交换的P（MgCl_2可提取）在0.5至1.32 mgkg〜（-1）之间。水相与沉积物之间的平衡P浓度（EPC_o）在0.02至0.11 mgL〜（-1）之间。当比较沉积物EPC_o与沟水中溶解的P浓度时，沉积物起作用作为七个数据收集站点中五个站点中的P汇。沉积物缓冲水柱P的能力，通过线的斜率测量用于计算沉积物EPC_o的关系，水溶液中rngPL〜（-1）中每单位吸附的磷〜（2.7〜13.8 mg P）kg〜（-1）沉积物。与以前的研究相比，化学修饰物不易改变，易于交换沉积物中的P或沉积物EPC_o以及在线性P吸附等温线中观察到的斜率。虽然可以使用化学修正来增加沉积物对P的吸附并减少沉积物中可交换的P，但这表明该做法应针对每年他们将是最有效的。

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