【摘要】 湖泊沉积物中磷存在形态 ,是理解湖泊系统中磷的生物地球化学循环的重要方面 ,对研究湖泊富营养化等环境问题具有重要意义。本次工作中 ,采用连续提取化学分析技术 ,对红枫 -百花湖沉积物中磷的存在形态及其剖面变化进行了研究 ,磷的存在形态包括 :吸附态磷 (LooselysorbedP)、铁结合态磷 (Fe boundP)、钙结合态磷 (Ca boundP)、矿物晶格中结合力强的残留态磷 (Detrial P)和有机态磷 (Organic P)。研究表明 ,两湖沉积物中 ,铁结合态磷 (Fe boundP)所占比例最大。铁氧化物或铁氢氧化物矿物的早期成岩作用 ,是影响沉积物磷地球化学循环的主要方面。更多还原

【Abstract】 Understanding the geochemistry and burial history of phosphorus (P) in lake sediments is important because of the key role of P in controlling lake productivity. We have examined the distributions of P in sediments from Lake Hongfeng and Lake Baihua in Guizhou Province by the sequential extraction method. The occurrence of total P (Total\|P) and the mineral forms of P (loosely sorbed P, Fe\|bound P, Ca\|bound P, detrial P, and organic P) in sediments were investigated. Significant variations in the forms of P with depth in the sediment cores, especial Total\|P, Fe\|bound P, Ca\|bound P were observed. Fe\|bound P is the dominant form in the sediments of both lakes. The reductive dissolution of amorphous Fe during burial is one of the most important factors affecting the biogeochemical cycling of P in these two lakes.更多还原