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Wet Deposition Chemistry in Mountain Agriculture: A Case Study Of Shiding
Acid deposition is a growing environmental problem in the world, with many impacts on ecology. Such as nutrient depletion, forest degradation, acidification of soil and surface water, death of lakes and swamps, and damage to crops. The application of urea and animal manure in agriculture leads to the accumulation of ammonia in the atmosphere. Long-term accumulation may cause an increase in nitrogen deposition that adversely affects soil and plants. This study directly collects the wet deposition in the farmland of Shi-ding and analyzes its chemistry and roughly estimates its flux. The results show that the rainfall pH is less than 5.0, accounting for 53% of all data. Fog water pH below 5.0 only accounts for 28% of all data. The average pH is also higher than rain pH. The research site is located in the tea garden.Animal manure and urea applied to farmland spilled into the air, making the ammonia concentration higher.Ammonia dissolved in mist water can effectively increase the pH value of fog water. The high concentrations of Na+ and Cl- in precipitation are mainly related to typhoons.The high concentration of Ca2+ in December to March is mainly related to the relatively dry season and the relatively serious sand and dust situation. The lower NH4+ ion concentration than that of Xitou may be related to the less agricultural fertilization area.The high concentration of NO3- and high flux are mainly from April to June. May be related to the long-range transmission of Chinese pollutants. The concentration of SO42- is lower than that of Fushan, which may be related to the long-distance transmission of pollutants by the northeast monsoon, or it may be because the research year is 20 years apart.Acid deposition in Taiwan has improved significantly over the past 20 years. The ability of fog water to intercept matter is higher than rainwater, so the ion concentration of fog water is higher than rain water. However, the concentration is diluted due to the instrument, so it is lower than in other studies.The fog water ion flux is also relatively low.Only NH4+ flux is equivalent to 71% of rainwater, which is higher than 57% of Xitou. Although the farmhouse did not over-fertilize in this study, the flux has been quite high.Flux in areas with excessive fertilization maybe even more appreciable and may even affect surrounding ecosystems.
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