Atmospheric sulfur deposition in a paddy rice region in the hilly region in central china
JIANG Wen-qian1,2, ZHU Xiao1,2, SHEN Jian-lin1, HUANG Zhong-ting3, GONG Dian-lin1, LI Yong1, WU Jin-shui1
1. Key Laboratory of Agro-ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Hunan Environmental Monitoring Centre, Changsha 410000, China
This study measured atmospheric bulk and dry sulfur depositions in 2015 and 2016 in a paddy rice region in the hilly region in central China, analyzed the relationship between SO42- and NO3- in rainwater, and explored the sources of atmospheric sulfur compounds. The annual average concentrations of SO2-S in the atmosphere and SO42--S in the rain water in the study region were 8.5μg/m3 and 1.8mg/L, respectively. The annual average of the total sulfur deposition was 26.8kgS(hm2·a), with the annual average of bulk deposition of 18.2kgS(hm2·a), and the annual average of dry deposition of 8.6kgS(hm2·a). There were significant seasonal variations in the sulfur bulk and dry depositions. The sulfur bulk deposition in spring was the highest, while the sulfur dry deposition in winter was the highest among the seasons. The mass ratio of NO3-/SO42- in the rainwater was less than 1in most of the months, indicating that the primary source of the atmospheric sulfur compounds was the stationary pollution source (coal burning) in the study region. There was relatively high sulfur deposition in the paddy rice regions in the hilly region in central China in the studied period, but the sulfur deposition had been decreased largely as compared to those measured in early 2000s. Thus, sulfur fertilizers need to be used in the croplands in this region based on the soil sulfur balance status, so as to keep high yields of crops.
姜文倩, 朱潇, 沈健林, 黄钟霆, 宫殿林, 李勇, 吴金水. 大气沉降向华中丘陵区稻田输入硫通量的观测[J]. 中国环境科学, 2020, 40(11): 4848-4856.
JIANG Wen-qian, ZHU Xiao, SHEN Jian-lin, HUANG Zhong-ting, GONG Dian-lin, LI Yong, WU Jin-shui. Atmospheric sulfur deposition in a paddy rice region in the hilly region in central china. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(11): 4848-4856.
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