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应用生态学报 ›› 2012, Vol. 23 ›› Issue (01): 264-270.

• 研究论文 • 上一篇    下一篇

滆湖大洪港草、藻状态转换的磷阈值

陶花1,潘继征2**,沈耀良1,3,李文朝2,黄峰1,赵海光2   

  1. 1苏州科技学院环境科学与工程学院, 江苏苏州 215011;2中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;3苏州科技学院江苏省环境科学与工程重点实验室, 江苏苏州 215011
  • 出版日期:2012-01-18 发布日期:2012-01-18

Phosphorus threshold for the shift between grass- and algae-stable states in Dahong Harbor of Gehu Lake.

TAO Hua1, PAN Ji-zheng2, SHEN Yao-liang1,3, LI Wen-chao2, HUANG Feng1, ZHAO Hai-guang2   

  1. 1School of Environmental Science and Engineering, Suzhou University of Science and Technolgy, Suzhou 215011, Jiangsu, China;2State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnolgy, Chinese Academy of Sciences, Nanjing 210008, China; 3Jiangsu Province Key Laboratory of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, Jiangsu, China
  • Online:2012-01-18 Published:2012-01-18

摘要: 以滆湖水草残存区——大洪港为对象,研究了自然条件下磷对大洪港草、藻状态转换的影响.对环境因子进行相关分析表明:总磷(TP)与叶绿素a(Chl a)、透明度(SD)呈较好的线性相关关系.主成分分析结果表明,TP、总氮(TN)是影响水质变化的主要成分,其中主成分的贡献率及最大分量来源为TP.总磷浓度的变化影响大洪港草/藻型状态的转换,大洪港冬季处于草型状态,春季从草型状态转换为草-藻中间状态,夏秋季一直维持在草-藻中间状态.系统从草型状态向藻型状态转换的湖水总磷阈值为61 μg·L-1,从草-藻中间状态向藻型状态转换的总磷阈值为115 μg·L-1.可通过采取削减与控制污染源、底泥疏浚、构建沉水植被区等措施来改善湖区生境,使TP浓度降低到61 μg·L-1以下,以维持大洪港处于草型状态.

关键词: 草型, 藻型, 状态转换, 磷阈值, 滆湖

Abstract: Taking the macrophytes remaining area in Dahong Harbor of Gehu Lake as test object, this paper studied the phosphorus threshold for the shift between grass- and algae-stable states under natural conditions. The correlation analysis on the environmental factors showed that the total phosphorous in water body had better liner relationships with phytoplankton chlorophyll a and Secchi depth, and principal component analysis indicated that total phosphorous and nitrogen in the water body were the two main components affecting the water quality, among which, total phosphorous was the maximum weight source and played a determinant role in the shift between grass- and algae-stable states. The Harbor was in grass-stable state in winter, shifted to grass-algae intermediate state in spring, and kept the intermediate state in summer and autumn. The total phosphorous threshold for grass-stable state shifting to grass-algae intermediate state was 61 μg·L-1,and that for grass-algae intermediate state shifting to algae-stable state was 115 μg·L-1. In order to make the ecosystem shift from algae-stable state to grass-stable state, some measures such as cutting and controlling the Lake’s nutrient sources, removing the sediment rich in organic matter, and constructing submerged macrophytes areas should be adopted to make the total phosphorous threshold in the water body dropped to below 61 μg·L-1.

Key words: grass-stable state, algae-stable state, state shift, phosphorus threshold, Gehu Lake