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| 浮游植物对湖泊水体生态重建的响应——以太湖五里湖大型围隔示范工程为例 | |
| 引用本文： | 陈开宁,周万平,鲍传和,胡洪云.浮游植物对湖泊水体生态重建的响应——以太湖五里湖大型围隔示范工程为例[J].湖泊科学,2007,19(4):359-366. |
| 作者姓名： | 陈开宁 周万平 鲍传和 胡洪云 |
| 作者单位： | 1. 中国科学院南京地理与湖泊研究所,南京,210008;中国科学院研究生院,北京,100039 2. 中国科学院南京地理与湖泊研究所,南京,210008 3. 安徽农业大学,合肥,230036 |
| 基金项目： | 国家重点基础研究发展计划(973计划) , 国家高技术研究发展计划(863计划) , 国家自然科学基金 |
| 摘 要： | 根据太湖五里湖湾生态重建大型围隔示范工程的现场观测结果,分析了湖泊生态重建措施对浮游植物的影响,结果显示:(1)在生态重建的第一年,尽管生态重建区内种植了大量水生植物,水体氮磷含量也有较大幅度的下降,水体透明度也被提高了近一倍,但是藻类却大量生长,并暴发了蓝藻水华;第二年,生态重建区的环境条件逐渐对藻类(包括蓝藻和其中的微囊藻)产生了抑制作用,开始出现藻类生物量下降趋势;表明生态重建措施(以水生植被重建为中心的生态系统重建组合措施)可以在较短时间内(当年)建立起一定规模的水生植物群落,有效降低水体氮磷营养盐,提高水体透明度,但要在较短时间内(2年内)完善一个较大的水生态系统结构、有效降低藻类生物量(特别是夏季)有一定困难.(2)尽管氮磷营养盐对水体藻类总量增加有较大影响,但并不是蓝藻大量暴发的决定因素,上行作用力对蓝藻的控制(bottom-up effort)表现弱于下行作用力(top-down effort).(3)较低的TN/TP比值(15.9-35.6,平均30.5)既是蓝藻水华暴发的原因,也是其作用的结果,其可能有利于蓝藻的大量暴发.(4)生态重建措施较大幅度地改善了水环境,但并没有显著提高藻类多样性指数(Shannon index),因此,单凭藻类多样性指数并不能完全反映水环境改善状况,在评价水环境质量方面需要结合其它多种指标进行综合评估. |
| 关 键 词： | 浮游植物 生态重建 蓝藻水华暴发 太湖 浮游植物 湖泊水体 生态重建 响应 太湖 五里湖 大型围隔 示范工程 lakes ecological restoration phytoplankton Response Lake enclosure large 评估 综合 多种指标 结合 水环境质量 |
| 收稿时间： | 2006-07-27 |
| 修稿时间： | 2006-07-272006-11-22 |
Response of phytoplankton to ecological restoration in eutrophic lakes:an experimental large enclosure in Wuli Lake, Lake Taihu |
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| CHEN Kaining,ZHOU Wanping,BAO Chuanhe and HU Hongyun.Response of phytoplankton to ecological restoration in eutrophic lakes:an experimental large enclosure in Wuli Lake, Lake Taihu[J].Journal of Lake Science,2007,19(4):359-366. | |
| Authors: | CHEN Kaining ZHOU Wanping BAO Chuanhe and HU Hongyun |
| Institution: | Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China;Graduate School of Chinese Acdemy of Sciences, Beijing 100039, P, R. China,Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China,Anhui Agicultural University, Hefei 230036, P. R. China and Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, P. R. China |
| Abstract: | Response of phytoplankton to ecological restoration was evaluated based on the results of an experimental large enclosure in eutrophic Wuli Lake of Lake Taihu,China.The results indicated that in the first year of restora- tion,algal biomass significantly increased,and cyanobacteria blooms broke out although the coverage of aquatic plant was up to 55%;TN and TP were significantly decreased,and secehi depth was enhanced by 100% or so.in the next year,algal growth,including cyanobacteria and Microcystis,was inhibited in certain extent with improve- ment of environment in enclosure compared with that in the lake area(outside enclosure,a control area).The re- sult showed that response of phytoplankton to ecological restoration was a slow process.Higher TN and TP were not decisive factors for the breakout of cyanobacteria biomass though the increase of total algal biomass was caused by higher nutrition(TP).Bottom-up effort was weaker than top-down effort.The lower TN to TP ratio possibly facili- tated cyanobacteria growth,which was the cause and the result of cyanobacteria growth.In addition,the algal di- versity index(Shannon index)was not totally indicating aquatic environment improvement status.It was suggested that it needed to integrate many factors for evaluating the trend of ecosystem. |
| Keywords: | Phytoplankton ecological restoration breakout of cyanobacteria blooms Lake Taihu |
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