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There are many reservoirs in China, and the reservoir serves as an important source of drinking water. With the increasing pollution discharge upstream of the reservoir, the water quality of the reservoir is seriously threatened. Therefore, it is necessary to control the total amount of pollution and reduce the pollutants under the target water quality. In this paper, the upstream basin of the Yanghe Reservoir in Qinhuangdao City, Hebei Province was used as the study area, and the 0-D water quality model was used to estimate the water environment capacity of the study area under the Class II water quality target. And compared with the current pollutants, proposed reduction targets and measures. The results indicated that the water environmental capacity of total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD), and ammonia–nitrogen (NH3-N) in the study area were 3226.9t, 264.6t, 71,200.6t, and 5575.7 t, respectively. The COD and NH3-N water environmental capacity cannot be fully utilized. The TN and TP exceeded the standard seriously, exceeding 1.47 times and 1.13 times of the TN and TP water environmental capacity under the water quality target of Class II, respectively. TN and TP need to be reduced by 57% and 53% for satisfying quality requirements, respectively. Through the analysis of pollutant sources, practical and feasible pollutant emission reduction measures are discussed. [ABSTRACT FROM AUTHOR]

Correction to: Environmental Earth Sciences (2021) 80:508 https://doi.org/10.1007/s12665-021-... Unfortunately first author affiliation was published incorrectly as State Key Laboratory of Hydraulic Engineering Simulation, Safety of Tianjin University, Tianjin 300350, China The correct affiliation of the first author should be State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. The original article can be found online at https://doi.org/10.1007/s12665-021-09801-5. [Extracted from the article]

Water movement in a soil-plant system was evaluated based on capillary flow in a modified subsurface irrigation system that incorporates a plant-water measuring device. Water from a reservoir tank located underneath the plant pot was supplied to the root zone through a fibrous medium. Evapotranspiration was measured from the water uptake and evaluations were performed based on soil moisture distribution and mass balance. Potential evapotranspiration was used as a reference for the plant-water uptake. Data were obtained from a test plant provided with the modified subsurface irrigation system. The plant was grown in a phytotron under controlled air temperature and humidity, and a comparison was made for different levels of soil moisture condition. The experimental results confirmed the operational efficiency of the modified subsurface irrigation system for precision irrigation. [ABSTRACT FROM AUTHOR]