水生态学杂志2017，Vol.38Issue(2)：65-69,5.
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
摘要
Abstract
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 parameters 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 parameters 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 (early wet season), August (late wet season) and November (normal season) from 2011 to 2015.Water samples were collected at 0.5 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 (NH+4-N), nitrate nitrogen (NO-3-N) and total phosphorus (TP).Chlorophyll-a concentration ranged from 0.8-44.5 μg/L, indicating that the water quality of Hedi Reservoir was eutrophic.The highest concentration 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 equation: YChl-a=7.690XCODMn-32.587 XTP-8.689 (P<0.001).The chlorophyll-a concentration was significantly related to CODMn and TP, and TP was the factor limiting phytoplankton growth.Principal component analysis showed that SD, NH+4-N, TP, TN and NO-3-N were the major environmental factors affecting water quality of Hedi Reservoir.关键词
鹤地水库/叶绿素a/时空分布/逐步回归分析Key words
Hedi Reservoir/chlorophyll-a/spatial-temporal distribution/stepwise multiple regression analysis分类
生物科学引用本文复制引用
王晓辉,杨扬..鹤地水库叶绿素a时空分布特征及其与环境因子的关系[J].水生态学杂志,2017,38(2):65-69,5.基金项目
广东省湛江市科技计划项目(2014A01008) （2014A01008）
国家水体污染控制与治理重大专项(2012ZX07206-004). （2012ZX07206-004）
