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作 者 ：何江,孙英,吕昌伟,刘二东,沈丽丽

期 刊 ：生态学报 2010年 30卷 2期 页码：389~398

关键词：沉积物；磷；内源释放；环境因子；岱海；

Keywords:sediments, phosphorus, endogenesis release, environmental condition, the Daihai Lake,

摘 要 ：以北方半干旱地区典型内陆封闭湖泊岱海为研究对象，开展了上覆水质及多种环境因子(温度，pH，溶解氧，扰动，光照)对湖泊沉积物内源磷释放的影响研究。结果表明：(1)温度升高有利于内源磷的释放，湖泊水体在温度较高的夏季更易呈现富营养化状态；(2)碱性条件有利于磷的释放，岱海水体属微碱性环境(pH 8.8)，若水体pH进一步升高，将会造成沉积物内源磷的大量释放；(3)厌氧条件(ρDO<0.8mg/L)有利于磷的释放，岱海湖心区水深较深，易形成厌氧环境，因此湖心区内源磷释放强度较浅水区大；(4)强烈扰动有利于磷的释放，这会对浅水区的底质产生较大影响；(5)照度通过底栖藻类的生物作用，间接地限制了沉积物释磷对上覆水中磷浓度的影响。

Abstract:The Daihai Lake (40°29′27″-40°37′6″N, 112°33′31″-112°46′40″E) is a typical inland lake in a semiarid region in Inner Mongolia, China. This research is mainly focus on phosphorus release from the surface sediments in different environmental conditions which is temperature, pH, dissolved oxygen (DO), disturbance and illumination. The results are described as follows: (1) the concentration of phosphorus release from the sediments increases with temperature. (2) It is higher in alkali condition, therefore it will cause a lot of phosphorus release when pH increases in the Daihai Lake (pH 88). (3) It is higher in anaerobic condition (ρDO<0.8mg/L), and the concentration of phosphorus in overlying water is higher in deep water area in which the DO is lower than in shallow water. (4) The disturbance is propitious to phosphorus release, which has an impact on the sediment in shallow water. (5) The illumination has an influence on phosphorus release from the surface sediments indirectly through biological action of benthic algae.

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