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| 1 | 洪泽湖入湖河流沉积物有机磷分布特征及外源输入对其形态转化的影响显示文摘为探究洪泽湖入湖河流沉积物有机磷的空间分布及外源输入对其形态转化的影响,本文利用Ivanoff法开展有机磷形态特征研究,并通过实验室添加常见外源有机质和铁离子,深入探讨外源物质对沉积物有机磷形态变化的长期影响.研究结果表明,洪泽湖入湖河流沉积物有机磷含量范围为34.8~398.6 mg/kg,占总磷的7.7%~36.9%,其中非活性有机磷(NOP)>中活性有机磷(MLOP)>活性有机磷(LOP).濉河沉积物LOP平均占比为19.4%,高于其他河流,而成子河NOP平均占比最高,为56.41%,表明有机磷的空间分布不均匀.总体而言,安河和濉河沉积物中总氮、总磷和有机磷含量显著高于成子河和淮河,显示前两条河流有较高的污染水平.冗余分析表明河流沉积物有机磷形态明显受到其理化性质影响,而不同污染程度沉积物的影响因素有所不同.外源物质添加能够活化沉积物的有机磷,促使NOP向LOP和MLOP转化,有机质输入引起的沉积物有机磷形态变化要大于铁元素输入,而外源物质输入对污染较重河流沉积物的有机磷转化作用更为显著.因此,减少入湖河流周边的外源污染排放是减少湖泊生物可利用磷的有效途径. | 韩年 袁旭音 周慧华 朱海 熊玉婷 陈耀祖 | 2020 | 湖泊科学2020，32，3： | 14 |
| 2 | Phosphorus removal from sediments by Potamogeton crispus:New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention显示文摘Macrophytes are usually chosen for phytoremediation tools to remove P in eutrophic aquatic ecosystems,but the lack of test methods hinders the understanding of removal mechanism and application.In this study,we used the novel technologies combined of Diffusive gradients in thin films(DGT),Planar optode(PO),and Non-invasive micro-test technology(NMT)to explore P dynamics in water-sediment continuum and rhizosphere of Potamogeton crispus over time.Results of the high-resolution in situ measurement showed that labile P(LPDGT)fluxes at the surficial sediment significantly decreased from approximate 120,140,and 200 pg/(cm^(2)·sec)via 30 days incubation period to 17,40,and 56 pg/(cm2•sec)via that of 15 days.Obvious synchronous increase of LPDGT was not detected in overlying water,suggesting the intense assimilation of dissolve reactive P via root over time.PO measurement indicated that O_(2)concentration around the rhizosphere remarkably increased and radially diffused into deeper sediment until 100%saturation along with the root stretch downwards.NMT detection of roots showed the obvious O_(2)inflow into root tissue with the uppermost flux of 30 pmol/(cm2•sec)from surroundings via aerenchyma on different treatment conditions.Different from previous reports,gradually saturating O_(2)concentrations around the rhizosphere was principally driven by O_(2)penetration through interspace attributing to root stretch downward rather than root O_(2)leakage.Increased O_(2)concentrations in deep sediment over time finally induced the oxidization of labile Fe(II)into Fe(III)bound P and local P immobilization. | Hezhong Yuan Yiwei Cai Zhen Yang Qiang Li Enfeng Liu Hongbin Yin | 2021 | Journal of Environmental Sciences2021，33，11： | 2 |
| 3 | 澜沧江梯级水库沉积物磷形态特征及释放风险显示文摘为阐明深水水库沉积物磷赋存形态的空间分布特征和潜在的释放风险,对澜沧江中下游4座梯级水库(功果桥、小湾、漫湾和糯扎渡)的沉积物和上覆水理化性质进行了研究.结果表明,各水库沉积物总磷(TP)含量变化范围在266.66~842.87mg/kg之间,平均为533.18mg/kg.各水库沉积物有机磷(OP)变化特征表现为功果桥水库沉积物OP以生物可利用OP为主过渡到其他水库以残渣磷为主.各水库沉积物无机磷(IP)分布特征表现为生物可利用IP由上游到下游逐渐增加,环境条件有利于下游水库生物可利用IP的形成.相关性分析表明,有机质和上覆水体环境因子是影响沉积物磷形态分布的重要因素.通过对各水库沉积物-水界面正磷酸盐(PO_(4)^(3-)-P)浓度分析得知,孔隙水PO_(4)^(3-)-P浓度范围在0.017~0.258mg/L之间,上覆水PO_(4)^(3-)-P浓度范围在0.015~0.055mg/L之间,PO_(4)^(3-)-P均是由孔隙水向上覆水进行扩散,其释放通量范围为0.010~0.116mg/(m^(2)·d).季节性缺氧和区域沉积作用使下游水库存在较大的PO_(4)^(3-)-P释放风险. | 孙猛 包宇飞 王雨春 胡明明 李姗泽 温洁 张迪 | 2023 | 中国环境科学2023，43，7： | 1 |
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