Comparing the biogeochemical functioning of two arid subtropical coastal lagoons:the effect of wastewater discharges  

作　　者：Julio Medina-Galván Carmen Cristina Osuna-Martínez Gustavo Padilla-Arredondo Martín Gabriel Frías-Espericueta Ramón Héctor Barraza-Guardado JoséAlfredo Arreola-Lizárraga 

机构地区：[1]Facultad de Ciencias del Mar,Universidad Autónoma de Sinaloa,Mazatlán,México [2]Programa de Planeación Ambiental y Conservación,Centro de Investigaciones Biológicas del Noroeste,S.C.,Guaymas,México [3]Departamento de Investigaciones Científicas y Tecnológicas de la Universidad de Sonora,Hermosillo,México

出　　处：《Ecosystem Health and Sustainability》2021年第1期49-60,共12页生态系统健康与可持续性（英文）

基　　金：Julio Medina-Galván is a recipient of a CONACYT student fellowship[#769282];This study was conducted with funding from the project CONAGUA-CONACyT[#2007-66573].

摘　　要：Nutrient flux,net metabolism,and N2 fixation and denitrification processes were estimated and compared in two semi-arid subtropical coastal lagoons in the Gulf of California:El Soldado(ES),where no wastewater is discharged,and El Rancho(ER),where shrimp farm effluents are regularly discharged.Biogeochemical processes were evaluated with the LOICZ model.Flushing time was<2 days in both systems.Nutrient fluxes were higher in ER than in ES and both systems acted as nutrient sinks for most of the year.ER showed a larger nutrient flow rate in the summer and autumn due to the input of shrimp-farm effluents.Nitrogen fluxes increased in both ER and ES in the winter in response to the increased nutrient supply from coastal upwellings.ER and ES both showed autotrophic metabolism and N2 fixation in the spring,autumn,and winter,but heterotrophic metabolism and denitrification in the summer.Denitrification dominated in ER(−2.21 mmol m^(2)day^(−1))and values were higher than those estimated in ES(−0.45 mmol m^(2)day^(−1)).The comparative analysis between ES and ER evidenced the significant changes in its biogeochemical performance caused by the input of anthropogenic nutrients,and can orient the environmental management of coastal lagoons.

关 键 词：Coastal lagoons nutrient budgets net ecosystem metabolism Gulf of California 

分 类 号：X52[环境科学与工程—环境工程]