摘要
2006年9～10月在长江采集悬浮颗粒物样品，应用改进后的SEDEX法对磷的赋存形态进行了分析。结果表明，自生磷灰石磷是长江悬浮颗粒物中磷的主要赋存形态。涪陵至万州江段，碎屑磷灰石磷的含量较高，弱吸附态磷和有机磷含量较低，磷的赋存形态主要受悬浮颗粒物含量的影响；香溪至葛洲坝下江段，弱吸附态磷和有机磷含量较高，碎屑磷灰石磷含量较低，磷的赋存形态主要受浮游植物生长及泥沙粒径的影响；城陵矶至大通江段，有机磷、碎屑磷灰石磷和铁结合态磷含量较高，弱吸附态磷含量较低，磷的赋存形态主要受泥沙粒径和洞庭湖输入的影响。长江悬浮颗粒物中生物可利用磷占颗粒态磷的45．6％，长江上游水体中生物可利用磷含量较低，下游含量较高。
Samples of suspended particulate matter were collected from Yangtze River for the period September through October 2006. The phosphorus forms in the suspended particulate matter samples were extracted and examined using the improved technology from the sequential extration method （SEDEX） Ltd. The results show that the authigenic apatite is the dominant form of particulate phosphorus in the Yangtze River. However, the distribution of phosphorus soeciation and the orimarv influential factor appear to be different along the river. From Fuling to Wanzhou, the concentration of detrital fluorapatite phosphorus is high, but the concentration of loosely adsorbed phosphorus and organic phosphorus are low, and the distribution of phosphorus forms is controlled by the amount of suspended particulate matter. In the downstream reach from Xiangxi to Gezhouba, the concentration of loosely adsorbed phosphorus and organic phosphorus are high, the concentration of detrital fluorapatite phosphorus is low, and the contents of phytoplankton and particle sizes in the reach determine the distribution of phosphorus forms. The further downstream reach between Chenglingji to Datong, the concentrations of detrital fluorapatite phosphorus, iron-bound phosphorus and organic phosphorus are high, but loosely adsorbed phosphorus is low. The distribution of phosphorus forms in the reach is affected by the particle size and afflux from the Dongting Lake. The result also shows that the bio-available phosphorus constitutes of 45.56% of all the suspended particulate phosphorus in the Yangtze River. The bio-available phosphorus is more concentrated in downstream reaches than the upstream ones.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2010年第1期107-112,共6页
Advances in Water Science
基金
国家自然科学基金资助项目(30490232)
国家重点基础研究发展计划(973)资助项目(2002CB412405
2005CB422305)~~
关键词
磷
赋存形态
悬浮颗粒物
长江
phosphorus
forms
suspended particulate matter
Yangtze River
