秦岭北麓水源水库大气氮磷湿沉降特征:以李家河水库为例  

Characteristics of atmospheric nitrogen and phosphorus wet deposition in water source reservoirs in the northern foothill of Qinling Mountains:A case study of Lijiahe Reservoir

作　　者：刘宇轩 李凯[1,2] 黄廷林 张轩[1,2] 张春晓 宋云霞[1,2] 温成成 蔡晓春 LIU Yuxuan;LI Kai;HUANG Tinglin;ZHANG Xuan;ZHANG Chunxiao;SONG Yunxia;WEN Chengcheng;CAI Xiaochun(Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains,Xi’an University of Architecture and Technology,Xi’an 710055;Shaanxi Key Laboratory of Environmental Engineering,School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055;Lijiahe Reservoir Management Co.,Ltd.of Xi’an Water Group,Xi’an 710016)

机构地区：[1]西安建筑科技大学,秦岭水源地水质陕西省野外科学观测研究站,西安710055 [2]西安建筑科技大学环境与市政工程学院,陕西省环境工程重点实验室,西安710055 [3]西安水务(集团)李家河水库管理有限公司,西安710016

出　　处：《环境科学学报》2024年第6期308-317,共10页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2022YFC3203602);陕西省教育厅协同创新专项(No.22JY036);陕西省重点科技创新团队项目(No.2023-CX-TD-32)。

摘　　要：为了解大气湿沉降对秦岭北麓水源水库营养盐输入的影响,于2022年8月—2023年7月在李家河水库开展了大气氮、磷湿沉降监测,分析了李家河水库大气氮、磷湿沉降特征与输入负荷.结果表明:李家河水库的降水主要集中在春、夏季,占全年降水量的73.80%;湿沉降中TN浓度为0.45~8.10 mg·L^(-1),NH_(3)-N和NO_(3)^(-)-N是其主要成分,分别占TN的56.93%~64.87%和27.57%~36.37%,TN、NH_(3)-N和NO_(3)^(-)-N的湿沉降通量均在夏季达到峰值,TN的年湿沉降通量为2510.93 kg·km^(-2);湿沉降TP月均浓度一般为0.010~0.020 mg·L^(-1),但春季受极端沙尘天气的影响最高达0.042 mg·L^(-1),TP的年湿沉降通量为18.70 kg·km^(-2).研究显示,李家河水库大气湿沉降中氮输入处于较高水平,是水库不容忽视的外部污染来源.In order to understand the contribution of atmospheric wet deposition to nutrient input of water source reservoirs at the northern foothill of Qinling Mountains,atmospheric wet deposition of nitrogen and phosphorus in Lijiahe Reservoir was monitored from August 2022 to July 2023.The seasonal variation characteristics of atmospheric wet deposition and annual deposition fluxes were analysed.The results showed that the precipitation in Lijiahe Reservoir was mainly concentrated in spring and summer,accounting for 73.80%of the annual precipitation.The total nitrogen(TN)concentration in the wet deposition ranged from 0.45 to 8.10 mg∙L^(-1),with NH_(3)-N and NO_(3)^(-)-N as the primary components,constituting 56.93%~64.87%and 27.57%~36.37%of the TN,respectively.The wet deposition fluxes of TN,NH_(3)-N and NO_(3)^(-)-N all peaked in summer,and the annual wet deposition flux of TN was 2510.93 kg∙km^(-2).The average monthly concentration of total phosphorus(TP)in wet deposition primarily ranged between 0.010 and 0.020 mg∙L^(-1),with a peak concentration of 0.042 mg∙L-¹during extreme dusty weather conditions.The annual wet deposition flux of TP was 18.70 kg∙km^(-2).It shows that nitrogen input from atmospheric wet deposition is relatively high in Lijiahe Reservoir,which is an external pollution source that cannot be ignored.

关 键 词：大气湿沉降 氮磷 沉降通量 污染特征 秦岭北麓水源水库 

分 类 号：X524[环境科学与工程—环境工程]