鹤地水库叶绿素a时空分布特征及其与环境因子的关系  

Spatial-temporal Distribution of Chlorophyll-a and Its Relationship with Environmental Factors in Hedi Reservoir

作　　者：王晓辉[1] 杨扬[2] 

机构地区：[1]广东省水文局湛江水文分局,湛江524037 [2]暨南大学水生生物研究所,广州510632

出　　处：《水生态学杂志》2017年第2期65-69,共5页Journal of Hydroecology

基　　金：广东省湛江市科技计划项目(2014A01008);国家水体污染控制与治理重大专项(2012ZX07206-004)

摘　　要：为全面了解鹤地水库水体富营养变化趋势及导致水体富营养化的环境因子,于2010-2015年2月、5月、8月和11月,对鹤地水库叶绿素a含量及主要环境因子进行测定,分析鹤地水库叶绿素a含量的时空分布特征,运用逐步回归分析方法探讨鹤地水库叶绿素a和环境因子之间的相关关系,建立逐步回归方程,并运用主成分分析法对影响鹤地水库水质的主要环境因子进行了分析。结果表明,鹤地水库叶绿素a含量在0.8~44.5μg/L,该水库处于富营养化水平;在时空分布上,叶绿素a含量季节变化表现为枯水期最低、平水期其次、丰水期相对较高;空间变化表现为河流区浓度较高,过渡区和湖泊区较低。运用逐步回归分析法建立的全库区叶绿素a回归方程为:Y_(Chl-a)=7.690X_(COD_(Mn))-32.587 X_(TP)-8.689(P<0.001),影响鹤地水库叶绿素a含量的显著影响因子为高锰酸盐指数和总磷,总磷可能为浮游植物生长的限制性因子。主成分分析结果表明,影响水库水质的主要环境因子有透明度、氨氮、总磷、总氮和硝态氮。Eutrophication of water bodies is a global problem and concern has been increasing at home and abroad. Chlorophyll-a （Chl-a） concentration is the primary means of evaluating the eutrophic status of lakes and reservoirs. Hedi Reservoir is one of the five largest drinking water sources in Guangdong Province and, to better understand the nutrient dynamics and factors influencing eutrophication, seasonal monitoring of chl-a and physicochemical parame- ters was carried out in the reservoir from 2010 to 2015. Based on the results, the temporal-spatial distribution of Chl-a in Hedi Reservoir was characterized. The relationships between the level of Chl-a and environmental parame- ters were evaluated by stepwise multiple regression analysis and the primary driving factors affecting water quality were determined by principal component analysis. Monitoring was carried out in February （ dry season） , May （ ear- ly wet season） , August （ late wet season） and November （ normal season） from 2011 to 2015. Water samples were collected at O. 5 m below the surface and in-situ measurements [ water temperature, pH, dissolved oxygen （DO） and Secchi disk depth （SD） ] were measured in the riverine zone, transitional zone and lacustrine zone of Hedi Reservoir. Parameters determined in the lab included Chl-a, permanganate index （CODMn） , total nitrogen （TN）, ammonia nitrogen （NH4-N）, nitrate nitrogen （NO3- -N） and total phosphorus （TP）. Chlorophyll-a concentration ranged from 0.8 -44.5 p^g/L, indicating that the water quality of Hedi Reservoir was eutrophic. The highest con- centration of chl-a occurred in wet season and the lowest in dry season, and the concentration increased after 2014. Spatially, the concentration of Chl-a in the riverine zone was higher than in the transitional and lacustrine zones. The relationship of Chl-a concentration with environmental factors was expressed by stepwise multiple regression e- quation ： Ychl-a = 7. 690XcoDM~ -- 32. 587 XTp -- 8. 689 （P 〈 0. 00

关 键 词：鹤地水库 叶绿素A 时空分布 逐步回归分析 

分 类 号：Q176[生物学—水生生物学]