Fog and precipitation chemistry at a mid-land forest in central Taiwan

Yang Ling Liang, Teng Chiu Lin*, Jeen Liang Hwong, Neng Huei Lin, Chiao Ping Wang


研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)


We analyzed fog and bulk precipitation chemistry at a cloud forest in central Taiwan where mountain agriculture activities are highest. T ere were 320 foggy days (visibility <1000 m) recorded between April 2005 and March 2006. Fog was most frequent between April 2005 and July 2005 and in March 2006 (153/153 d) and least frequent in January 2006 (21/31 d). T e total fog duration was 2415 h, representing 28% of the sampling period. Compared with bulk precipitation, fog was disproportionally enriched in NO 3- and SO 4 2- relative to K +, Ca 2+, Mg 2+, and NH 4 +, resulting in higher a content of nitric acid and sulfuric acid than weak acids or neutral salts and, therefore, higher acidity (median pH, 4.9) in fog than in bulk precipitation (median and mean pH, 5.5). T e very high input of NH 4 + (47 kg N ha -1 yr -1) through bulk precipitation suggests that the use of fertilizer (ammonium sulfate and animal manure) associated with mountain agriculture has a major impact on atmospheric deposition at the surrounding forest ecosystems. T e input of inorganic N reached 125 kg N ha -1 yr -1 and likely exceeded the biological demand of the forest ecosystem. Sulfate is the most abundant anion in fog at Chi-tou and in precipitation at various forests throughout Taiwan, suggesting that the emission and transport of large quantities of SO 2, the precursor of SO 4 2-, is an island-wide environmental issue.

頁(從 - 到)627-636
期刊Journal of Environmental Quality
出版狀態已發佈 - 2009 3月

ASJC Scopus subject areas

  • 環境工程
  • 水科學與技術
  • 廢物管理和處置
  • 污染
  • 管理、監督、政策法律


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