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1、高中生慶祝建國60周年演講稿：英雄中尊敬的評委老師,親愛的同學們:大家好!今天，我演講的題目是：《英雄中國》。我們生活在英雄的國度，我們成長于英雄的民族、英雄的時代，我們的先人創(chuàng)造了英雄的業(yè)績，我們年輕一代肩負著繼往開來的英雄的的使命。讓我們走入歷史的煙云，去感受那一幕幕英雄的傳奇:女媧補天，精衛(wèi)填海，大禹治水，倉頡造字，在遠古洪荒的時代，我們的先人就創(chuàng)造著這樣的神話，更創(chuàng)造著神話般物磷的釋放量略高于中性條件下沉積物磷的釋放量；當上覆水磷含量較高時，沉積物中的磷呈“負釋放”狀態(tài).研究還顯示，沉積物中不同形態(tài)的磷含量與沉積
2、物磷釋放量有不同程度的相關性，其中可交換態(tài)磷(NH4CI-P)和可還原態(tài)磷(BD-P)含量與沉積物磷的釋放量高度相關(R2分別為0.99和0.84).關鍵詞:海河;沉積物;磷釋放;環(huán)境因素中圖分類號：X522文獻標志碼：A文章編號：1001—6929(XX)04—0126—06sefromHaiheRiverSedimentSUNShu-juan,HUANGSui-丨iangCollegeofEnvironmentaIScienceandEngineering,NanKaiUniversity,Tianjin300071
3、,ChinaAbstract:PhosphorusreIeasefromthesedimentofHaiheRiveranditsreIationshipwithsedimentphosphorusformsweresimuIatedinIaboratory,whiIetheeffectsofanaerobicPaerobiccondition,pH,temperature,initiaITPconcentrationsofoverlyingwaterandmicroorganismactionwereaIsoinves
4、tigated.TheresuItsshowedthattheactionofmicroorganismwasthemaincauseforphosphorusreIeasedfromtheHaihesediment.TheanaerobicconditionwasmuchmorepropitioustothephosphorusreIeasedthantheaerobiccondition.AIsohighertemperaturewasheIpfuItothephosphorusreIease,andatthepre
5、senceofmicroorganism.ThesedimentreIeasedmorephosphorusunderaIkaIineoracidicconditionscomparedtotheneutraIcondition.ForhigherinitiaIphosphorusconcentrationoftheoverIyingwater,thesedimentabsorbedthehosphorusoftheoverIyingwateruntilabaIancsefromHaiheRiverSedimentSUN
6、Shu-juan,HUANGSui-丨iangCollegeofEnvironmentaIScienceandEngineering,NanKaiUniversity,Tianjin300071,ChinaAbstract:PhosphorusreIeasefromthesedimentofHaiheRiveranditsreIationshipwithsedimentphosphorusformsweresimuIatedinIaboratory,whiIetheeffectsofanaerobicPaerobicco
7、ndition,pH,temperature,initiaITPconcentrationsofoverlyingwaterandmicroorganismactionwereaIsoinvestigated.TheresuItsshowedthattheactionofmicroorganismwasthemaincauseforphosphorusreIeasedfromtheHaihesediment.Theanaerobicconditionwasmuchmorepropitioustothephosphorus
8、reIeasedthantheaerobiccondition.AIsohighertemperaturewasheIpfuItothephosphorusreIease,andatthepresenceofmicroorganism.ThesedimentreIeasedmorephosphorusunderaIk
