长江亚热带浅水湖群藻类浊度与非藻类浊度的变异规律  

VARIATIONS OF ALGAL AND NON-ALGAL TURBIDITY AMONG THE YANGTZE SUBTROPICAL SHALLOW LAKES

作　　者：王海军[1] 王洪铸[1] 潘保柱[1,2] 梁小民[1] 

机构地区：[1]中国科学院水生生物研究所淡水生态与生物技术国家重点实验室,武汉430072 [2]长江科学院水力学研究所,武汉430010

出　　处：《水生生物学报》2017年第2期414-419,共6页Acta Hydrobiologica Sinica

基　　金：国家自然科学基金(30900194);国家重大基础研究发展计划(2008CB418006);湖北省科技支撑项目(2015BBA225);淡水生态与生物技术国家重点实验室(2014FB14和2011FBZ14);中国科学院重大交叉项目(KZCX1-YW-14-1)和重大方向性项目(KZCX2-YW-426-02);中国科学院青年创新促进会基金(2014312)资助~~

摘　　要：浊度的上升是湖泊富营养化过程中沉水植物消失、由草向藻发生稳态转换的根本原因。研究利用长江中下游浅水湖群区域数据对藻类浊度(Turb _(Alg))和非藻类浊度(Turb _(NonAlg))及其对总浊度(Turb _(Tot))的贡献率(Turb _(Alg)%,Turb _(NonAlg)%)进行了推算。结果显示,在该区域非藻类浊度绝对值及其贡献率均普遍高于藻类浊度;Turb _(Alg)主要受限于总磷(TP),而Turb _(NonAlg)受水深(ZM)、TP和沉水植物等多重因素的影响。Turb _(Alg)和Turb _(NonAlg)呈现出随着TP浓度的升高而持续上升的趋势,表明尽管稳态转换存在特定的阈值,但整个富营养化过程中均需加强对营养物浓度的控制。Increasing turbidity is the main cause for the disappearance of submersed macrophytes and regime shift from clear-water to turbid-water states along the eutrophication of lakes. Quantitative discrimination on the contribution of algal and non-algal particles to total turbidity（Turb _（Tot）） may enhance the understanding on these processes. This study investigated algal turbidity（Turb Alg）, non-algal turbidity（Turb NonAlg）, and their contribution to Turb _（Tot） in percentage（Turb Alg%, Turb NonAlg%） using data from Yangtze shallow lakes. The results showed that both absolute and percentage non-algal turbidity（averaged 0.96/m and 71.0%） were much higher than those of algal turbidity（averaged 0.19/m and11.0%）. _（Tot）al phosphorus（TP） positively impact Turb Alg and Turb NonAlg, and when TP exceeded 100 μg/L, Turb Alg and Turb Alg% showed accelerated increases while Turb Non Alg% showed a decreasing trend. Turb Alg, Turb Alg% and Turb Non Alg were significantly lower in macrophyte-present lakes than in macrophyte-absent lakes, while Turb NonAlg% was not significantly different between lakes. Turb NonAlg and Turb NonAlg% increased significantly with decreased biomass of submersed macrophytes（BMac）, while Turb Alg and Turb Alg% showed no significant varying trend. In summary, Turb Alg was determined mainly by TP, while Turb NonAlg was greatly determined by ZM, TP, and submersed macrophytes. The fact of continuously increasing Turb Alg and Turb NonAlg along with increasing TP and degrading macrophytes demonstrates that nutrient control and macrophyte maintenance are practically important during the whole process of eutrophication, although there exists a threshold for clear-to-turbid regime shifts.

关 键 词：稳态转换 藻类浊度 非藻类浊度 湖盆形态 富营养化 长江浅水湖群 

分 类 号：Q142[生物学—生态学]