• 关键词：长江  悬浮颗粒物  颗粒态生物可利用磷  藻类增长潜力

• 基金项目：中国科学院知识创新工程项目(KZCX2-207);国家自然科学基金(49801019);中国科学院地理科学与资源研究所知识创新工程领域前沿(CX10G-A00-06)项目

• 王芳
• 中国科学院地理科学与资源研究所环境生物地球化学与健康室,北京 100101

• 晏维金
• 中国科学院地理科学与资源研究所环境生物地球化学与健康室,北京 100101

• 摘要：模拟不同采样时间长江输送悬浮态颗粒物实验,通过测定藻类增长潜力来讨论颗粒态磷的生物可利用性.结果表明,悬浮物中生物可利用磷(SSBAP)含量在不同采样时间(2001年2月、5月、12月和2002年8月)的平均值分别为(288.3±49.4),(228.2±38.2),(251.6±32.9)和(182.0±8.1)mg·kg^-1.不同藻种的SSBAP BAP平均值为:铜绿微囊藻(Microcystisaerugilnosa)54.2%,斜生栅藻(Scendesmusobliquus)60.3%.在4次采样中,通过大通站的BAP浓度均大于水体富营养化的限制值(0.02mg·L^-1),说明SSBAP对长江流域、河口及近海区营养盐的贡献是不容忽视的,颗粒态磷是长江河口及近海区富营养化的潜在污染源,它对河口及近海的生态环境造成很大影响.

• Abstract：Bioavailable phosphorus in the suspended sediment (SSBAP) was studied by simulating transportation of suspended sediment(SS)in the Changjiang River in different sampling dates (2001-02-14,2001-05-23, 2001-12-15,2002-08-10). The amount of SSBAP was estimated by algal growth potential. The results showed that SSBAP contents were about (288.3±49.4), (228.2±38.2), (251.6±32.9), (182.0±8.1)mg·kg^-1 in different sampling dates. SSBAP/BAP were 54.2% by Microcystis aerugilnosa and 60.3% by Scendesmus obliquus, respectively. Concentrations of BAP from 4 samplings at Datong Station were higher than the thresholds for eutrophication (0.02 mg·L^-1), indicating the importance of SSBAP flux to phosphorus levels in Changjiang River, the estuary and the coastal area. Phosphorus bound to particulates should be a potential source regarding to the algal bloom in Changjiang River estuary and the coastal area, which affects the ecosystem of the areas.

• Key words：AGP (algae growth potential)  BAP (bioavailable phosphorus)  the Changjiang River  SS (suspended sediment)  SSBAP (suspended sediment bioavailable phosphorus)

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