摘要
水化学是湿地水环境评价的重要参数.为研究天津七里海湿地的水化学组成和主要离子来源,采集了湿地内的沼泽水、周边的河水和地下水.结果表明:(1)河水、沼泽水的水化学类型为SO_(4)·Cl^(-)Na型,地下水水化学类型为HCO_(3)-Na型和HCO_(3)-Na·Ca型,沼泽水主要依靠河水补给,浅层地下水与河水交换作用明显;(2)水体离子组分受大气降水影响小,Na^(+)和K^(+)来源为盐岩溶解或蒸发浓缩作用,河水、沼泽水中Ca^(2+)、Mg^(2+)和HCO_(3)-主要受蒸发岩溶解作用,地下水中Ca^(2+)、Mg^(2+)和HCO_(3)-主要来源于碳酸盐岩溶解;(3)河水和地下水的水化学组分受阳离子交换作用明显,而沼泽水阳离子交换作用不明显;各水体的SO_(4)^(2-)和NO_(3)-受一定人类活动的输入;沼泽水和枯水期河水受蒸发盐岩溶解、蒸发作用及人为输入,丰水期河水主要受碳酸盐溶解及人为活动影响.湿地的水化学组成受到自然因素和人类活动的共同作用.
Hydrochemistry is an important parameter for wetland water environmental assessment.To study the hydrochemistry and main ion sources in the Qilihai wetland in Tianjin,river water,groundwater,and water in the marsh were collected and analyzed.The results show that:(1)The river and marsh waters are SO_(4)·Cl^(-)Na in type and groundwater water is HCO_(3)-Na and HCO_(3)-Na·Ca in type.The water in the marshes is mainly recharged by river water and the exchange of shallow groundwater with river water is notable;(2)Precipitation has little effect on the chemical composition of the water.Na+and K+were derived from the dissolution of salt rock and evaporative concentration.Ca^(2+),Mg^(2+),and HCO_(3)-in the river and marsh water are mainly derived from the dissolution of evaporite salt rock.Ca^(2+),Mg^(2+),and HCO_(3)-in the groundwater are mainly derived from carbonate mineral dissolution;(3)The hydrochemical composition of the river water and groundwater is notably affected by ion exchange,but this was not observed in the marsh water.Furthermore,SO_(4)^(2-)and NO_(3)-are affected by human activity.During the dry season,the river and marsh water are affected by evaporite salt rock dissolution,evaporation,and human effects,while in wet season,river water is mainly affected by carbonate dissolution and human activities.These observations demonstrate how that hydrochemical composition of this wetland is controlled by a combination of natural factors and human activities.
作者
何明霞
张兵
夏文雪
崔旭
王中良
HE Ming-xia;ZHANG Bing;XIA Wen-xue;CUI Xu;WANG Zhong-liang(Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University,Tianjin 300387,China;School of Geographic and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2021年第2期776-785,共10页
Environmental Science
基金
国家自然科学基金项目(41971037)
天津市应用基础与前沿技术研究项目(15JCQNJC44200)。
关键词
七里海湿地
水化学
离子来源
控制因素
Qilihai wetland
hydrochemistry
ion sources
controlling factors
