湖泊科学2017，Vol.29Issue(2)：334-342,9.DOI:10.18307/2017.0209
坦噶尼喀湖东北部入湖河流表层沉积物中磷的形态和分布特征
Phosphorus fractions and their spatial distribution in surface sediments of inflow rivers in the northeastern Lake Tanganyika
摘要
Abstract
Phosphorus is an essential nutrient in the Lake Tanganyika ecosystem, which determines the lake' s primary productivi-ty, and subsequently influences the animal protein sources for riparian residents. To understand the external inputs of phosphorus to the Lake Tanganyika, 16 surface sediment samples from the rivers which flow into the northeastern lake were collected and analyzed to understand the content and spatial distribution of the total phosphorus ( TP ) , and the relationship between land use pattern and the spatial distribution of different phosphorus forms. The TP content in surface sediment varied from 73.05 to 239.94 mg/kg, with an average content of 152.64±55.37 mg/kg, and the highest content was observed at Malagarasi river mouth. Using the sequential extraction method( Psenner) the phosphorus fractionation distribution of sediments was analyzed. The results showed that sequences of the contents of different phosphorus forms was Fe/Al-P >Ca-P >Org-P >Res-P >Labile-P . The TP content was highest in the estuarine wetlands, followed by that in urban areas, and the lowest content was in the woodland. It implies that land use had signif-icant impacts on the content of TP and phosphorus forms. The patterns also implied that surface runoff and human activities would be the causes of the TP accumulation in the surface sediment of inflowing rivers. The spatial distribution of different phosphorus forms differed from that of TP. The highest content of Liable-P, Fe/Al-P and Org-P were observed in the estuarine wetland, and then followed by those in the woodland.The urban area had the lowest contents. The highest contents of Ca-P and Res-P were found in urban area, and then followed by estuarine wetland. The woodland had the lowest content. According to the correlation analyses between the contents of different P forms and particle size of sediments, total nitrogen ( TN) , loss of ignition ( LOI) , and total or-ganic carbon (TOC), it was found that TN, LOI and TOC had significantly positive correlations with the Fe/Al-P, Labile-P and TP contents, while they had weak correlations with Org-P, Ca-P and Res-P. It indicated that the input of TN and organic matter would increase the content of phosphorus in the sediment, and the incremental P forms were Fe/Al-P and Liable-P. There were sig-nificant and positive correlations between fine particle sediments and the contents of different phosphorus forms, while significant and negative correlations existed between coarse sand and the contents of phosphorus forms. These results indicate that fine particle sediments are easier to adsorb the phosphorus.关键词
坦噶尼喀湖/入湖河流/沉积物/磷形态/土地利用Key words
Lake Tanganyika/inflowing rivers/sediments/phosphorus fraction/land use引用本文复制引用
余成,陈爽,张路,王兆德,申秋实,高群..坦噶尼喀湖东北部入湖河流表层沉积物中磷的形态和分布特征[J].湖泊科学,2017,29(2):334-342,9.基金项目
中国科学院海外科教基地建设计划项目( SAJC201319)资助. （ SAJC201319）
