Meteorological factors and water quality changes of Plateau Lake Dianchi in China (1990-2015) and their joint influences on cyanobacterial blooms
Meteorological factors and water quality changes of Plateau Lake Dianchi in China (1990-2015) and their joint influences on cyanobacterial blooms
复制标题
DOI：
10.1016/j.scitotenv.2019.02.010
复制
发表时间：
2019-05-15
影响因子：
9.8
通讯作者：
Hu, Hong-Ying
中科院分区：
文献类型：
--
作者：
Wang, Jing-Han;Yang, Cheng;Hu, Hong-Ying
富营养化湖泊蓝藻水华对人类和动物造成各种危害，扰乱饮用水供应，破坏湖泊生态系统。尽管国内外许多湖泊在CBS的防治方面取得了很大的进展，但对富营养化高原滇池湖泊CBS的影响因素进行系统的长时间跨度研究尚不多见。本研究从年际和月度两个方面对滇池1990-2015年间的气象和水质变化进行了综合概括，将滇池草海和外海划分为水质变化区域，利用Spearman相关分析、主成分分析和多元线性逐步回归分析了影响CBS的单个和联合影响因子。由于存在明显的水质异质性，分别对草海、北部外海、中部外海和南部外海四个特定的湖区进行了分析。结果表明，温和的气温、较低的风速和富营养化的水体条件都有利于滇池的CBS，而显著的升温趋势可能会加剧未来更严重的CBS。尽管结构不同，但滇池4个亚区CBS的第一主成分均由气象因素组成，水质参数特别是总磷浓度对第二主成分的贡献较大。对CBS的联合气象和水质影响因子的量化需要进一步改进，这在很大程度上依赖于未来天气预报的准确性，以便为CBS的有效管理设定每个特定湖区的水质改善目标。(C)2019爱思唯尔B.V.保留所有权利。
Cyanobacterial blooms (CBs) in eutrophic lakes can cause various harmful issues to both humans and animals, disturb drinking water supply, and devastate lake ecosystems. Although great progresses have been made in many lakes from China and abroad on CBs prevention, mitigation and control, systematic research on the influencing factors of CBs in hypereutrophic plateau Lake Dianchi over a long time span is so far unavailable. This study comprehensively generalized both meteorological and water quality changes in Lake Dianchi during 1990-2015 on both yearly and monthly basis, separated Caohai from Waihai of Lake Dianchi regarding water quality variations, and investigated the individual and joint influencing meteorological and water quality factors on CBs using Spearman correlation, principal component analysis, and multivariate linear stepwise regression. Four specific lake regions, i.e. Caohai, northern Waihai, central Waihai, and southern Waihai, were respectively analyzed due to significant water quality heterogeneity. Results indicated that mild temperatures, low wind velocities, and hypereutrophic water conditions all favor CBs in Lake Dianchi, and the significant temperature rising trend may exacerbate severer CBs in the future. Despite configuration differences, the first principal components on CBs in the four sub-regions of Lake Dianchi were all consisted of meteorological factors, while water quality parameters especially total phosphorus concentrations contributed to the second principal component. Quantification of joint meteorological and water quality influencing factors on CBs needs further improvement, and largely relies on the accuracy of future weather forecasts, in order to set the goal of water quality improvement in each specific lake region for effective CBs management. (c) 2019 Elsevier B.V. All rights reserved.