| 不同干燥方式对湖泊沉积物磷提取的影响 |
| |
| 引用本文： | 张润宇,王立英,刘超,朱淮武.不同干燥方式对湖泊沉积物磷提取的影响[J].矿物学报,2012,32(3):417-424. |
| |
| 作者姓名： | 张润宇 王立英 刘超 朱淮武 |
| |
| 作者单位： | 1. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳,550002
2. 贵州师范大学化学与材料科学学院,贵州贵阳,550001 |
| |
| 基金项目： | 国家重点基础研究发展计划项目，国家自然科学基金项目，贵州大学绿色农药与农业生物工程教育部重点实验室开放基金资助项目 |
| |
| 摘 要： | 以滇池5个典型区域表层沉积物为例,研究了自然风干、低温烘干和真空冻干等3种干燥方式对沉积物中磷的形态含量及其生物有效性测定的影响。结果表明：烘干、风干过程促进了沉积物有机磷的降解转化和微生物磷的释放,导致有机磷的含量偏低,总磷含量却比冻干高。各形态磷受不同干燥方式的影响程度不同,风干样品中BD-P较高,冻干样品中NaOH-rP含量最高,NH4Cl-P、HCl-P、残渣磷（Residual-P）由于含量较低或其化学性质比较稳定而差异不大。冻干样品中生物可利用磷分别比风干、烘干高26.7%、20.2%,表明冻干处理能较为真实地反映沉积物中磷的组成特征,是比较理想的样品干燥方式。各形态含量顺序为：藻类可利用磷（AAP）〉NaHCO3可提取磷（Olsen-P）〉水溶性磷（WSP）〉易解吸磷（RDP）。沉积物中Olsen-P与NH4Cl-P、BD-P、NaOH-rP、活性磷及上覆水体总磷水平呈显著正相关,因此可作为评价滇池沉积物磷的生物有效性的重要指标。
|
| 关 键 词： | 湖泊沉积物 磷 干燥方式 冻干 生物可利用性 Olsen-P |
Effects of Different Drying Modes on Characteristics of Phosphorus Forms in Lake Sediment |
| |
| ZHANG Run-yu,WANG Li-ying,LIU Chao,ZHU Huai-wu.Effects of Different Drying Modes on Characteristics of Phosphorus Forms in Lake Sediment[J].Acta Mineralogica Sinica,2012,32(3):417-424. |
| |
| Authors: | ZHANG Run-yu WANG Li-ying LIU Chao ZHU Huai-wu |
| |
| Institution: | 1.State Key Laboratory of Environment Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002, China;2.School of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001,China) |
| |
| Abstract: | Effects of three different drying modes,including air-drying,oven-drying,and vacuum freeze-drying modes,on the determination of phosphorus(P) forms and their bioavailabilities in five typical surface sediments from the Dianchi Lake were investigated.Results show that the content of organic P is underestimated due to its degradation and microbial biomass P release by oven-drying and air-drying,while total P is higher than that by freeze-drying.Effects of three drying modes on P forms appear to be different.BD-P is higher in air-dried sediments,NaOH-rP is the highest by freeze-drying,whereas NH4Cl-P,HCl-P and residual-P have little difference because of low contents and their stability.Contents of bioavailable P in freeze-dried sediments are 26.7% and 20.2% higher than those by oven-drying and air-drying,respectively,suggesting that freeze-drying could reflect the actual condition of lake sediments.Hence,this pretreatment seems to be the best drying mode.Content of different bioavailable P is followed by the order of AAP(alga available phosphorus)>Olsen-P(NaHCO3 extractable phosphorus)>WSP(water-soluble phosphorus)>RDP(readily desorbed phosphorus).Olsen-P is positively related with NH4Cl-P,BD-P,NaOH-rP,and labile P in sediment,as well as the P concentration in the overlying water,indicating the appropriate index for evaluating P bioavailability in sediments from Dianchi Lake. |
| |
| Keywords: | lake sediment phosphorus drying mode freeze-dried bioavailability Olsen-P Dianchi Lake |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
