期刊
CLEAN-SOIL AIR WATER
卷 42, 期 7, 页码 963-972出版社
WILEY
DOI: 10.1002/clen.201300209
关键词
Bioavailable P; Lake water; Release risk; Sediment composition; Wetland
类别
资金
- National Natural Science Foundation of China [41273130, 40801084, 41171216]
- Promotive Research Fund for Young and Middle-aged Scientists of Shandong Province, China [2007BS08017]
- Major National Basic Research Program of China [2013CB430403]
- One Hundred-Talent Plan of Chinese Academy of Sciences (CAS)
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Science & Technology Development Plan of Shandong Province [2010GSF10208]
- Science & Technology Development Plan of Yantai City [2011016, 20102450]
- Yantai Double-hundred High-end Talent Plan [XY-003-02]
- 135 Development Plan of YIC-CAS
Rongcheng Swan Lake, a natural coastal wetland, is connected to Rongcheng Bay of Yellow Sea, China. In this lagoon, water quality has deteriorated gradually in recent 30 years and filamentous Chaetomorpha linum have bloomed during the past five years. In present study, the concentration, fractions, and bioavailability of phosphorus (P) in surface sediments were investigated throughout the lake. In order to evaluate P retention ability of the wetland, six sediment samples from different lake regions were collected to study P adsortion kinetics, adsortion capacity and the relation to sediment properties. In Swan Lake, total P concentrations in sediments varied from 79 to 616 mg/kg, which were significantly higher in northwest region than those in southeast region. Sediment grain size and external inputs were the main factors affecting P distribution. Inorganic P concentration was obviously higher than that of organic P, and Ca-P was the important form in the sediments. Fe/Al-P showed a large spatial variation, with relatively high concentrations occurring at the northeastern corner and the western tip strongly affected by the discharge of wastewater. The adsorption isotherms were well fitted by Linear equation at low P conditions and by Langmuir equation at high initial P concentrations, respectively. The sediments in the northern and central lake had higher P adsorption capacity, while in southern lake the degree of P saturation of the sediments was high. Ammonium oxalate extractable Al, organic matter, and fine particle were important factors influencing P adsorption. In Swan Lake, algae available P (AAP) was the largest form of bioavailable P, followed by Olsen-P; moreover, AAP and Olsen-P showed significant correlations with Fe/Al-P. As a whole, TP concentration in sediments from Swan Lake was low, and the sediments at most regions had buffering ability for P in overlying water; while at the western tip of lake where macroalgal blooms frequently breakout, AAP concentration was relatively high and the sediments had higher potential for releasing P into water column.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据