【摘要】：采用SMT磷分級(jí)法研究長(zhǎng)江口及其鄰近海域沉積物中磷的賦存形態(tài)及分布特征,并探討了其影響因子.研究結(jié)果表明,沉積物中總磷(TP)含量為476.91~980.04μg·g~(-1),有機(jī)磷(OP)含量為15.84~139.21μg·g~(-1);而無(wú)機(jī)磷(IP)為主要賦存形態(tài),其含量為421.67~844.86μg·g~(-1),約占TP 72.9%~96.7%.IP中以鈣結(jié)合態(tài)磷(HCl-P)為主,其含量為186.88~431.69μg·g~(-1),占IP的42.3%~57.79%;而鐵/錳結(jié)合態(tài)磷(Na OH-P)的含量最少,其含量為4.17~52.76μg·g~(-1),僅占IP的2.0%~3.3%.空間分布上,不同形態(tài)磷含量具有明顯的時(shí)空變化特征.夏季TP和IP的含量由咸水端到淡水端呈現(xiàn)出先降低后升高,冬季則先升高后降低的趨勢(shì).OP的含量在夏季時(shí)無(wú)明顯分布規(guī)律,而在冬季時(shí)表現(xiàn)出由咸水端到淡水端降低的趨勢(shì).Na OH-P含量在冬夏季均表現(xiàn)為淡水端處較高;HCl-P含量在夏季無(wú)明顯的變化規(guī)律,而冬季時(shí)近淡水端處較高.沉積物粒徑大小影響磷的賦存形態(tài),表現(xiàn)為夏季粘粒對(duì)OP影響較大;冬季粘粒和粉粒與IP存在著負(fù)相關(guān)性,與OP存在著顯著的正相關(guān)性.此外,沉積物總有機(jī)碳、鹽度和堿性磷酸酶活性也是影響磷賦存形態(tài)的主要因子.
[Abstract]:The occurrence form and distribution characteristics of phosphorus in sediments of Changjiang Estuary and its adjacent waters were studied by SMT phosphorus classification method, and its influencing factors were discussed. The results show that the contents of total phosphorus (TP) and organophosphorus (OP) in sediments are 476.91 ~ 980.04 渭 g 路g ~ (- 1) and 15.84 ~ 139.21 渭 g 路g ~ (- 1), respectively. Inorganic phosphorus (IP) is the main occurrence form, its content is 421.67 ~ 844.86 渭 g 路g ~ (- 1), which is mainly calcium bound phosphorus (HCl-P) in TP 72.9%~96.7%.IP, and its content is 186.88 ~ 431.69 渭 g 路g ~ (- 1), accounting for 42.3% 鈮，

本文編號(hào)：2501932