Evaluation of dry deposition of acidifying N compounds to vegetation.
This papers deals with direct measurements of dry deposition flux of total acidifying N species (gaseous HNO3 and particulate NO3(-)) and theoretically by parameterization method to vegetation (leaf surfaces) over a semiarid region in India. Annual average experimental dry deposition of NO3(-) to leaf of Cassia is 0.65 ± 0.61 mg m(-2) day(-1). Ambient concentrations of HNO3 vapor and particulate NO3(-) are 1.53 and 1.24 μg m(-3), respectively. Theoretically obtained dry deposition velocity of HNO3 and NO3(-) are 0.74 cm s(-1) for both while calculated dry deposition flux of total NO3(-) is found to be 1.3 ± 0.33 mg m(-2) day(-1). The measured dry deposition flux of NO3(-) to Cassia leaf is in the range of theoretically obtained flux. The annual input of N as nitrate is 3.8 mmol m(-2) year(-1) which is lower than the other forest site in China which is probably because of low pollution than China.
Department of Chemistry, Technical College, Dayalbagh Educational Institute, Dayalbagh, Agra-5, India. rkschem@rediffmail.com.
Ranjit
R
Kumar
Department of Chemistry, Faculty of Science, Dayalbagh Educational Institute, Dayalbagh, Agra-5, India.
K Maharaj
KM
Kumari
D000143:Acids; D000397:Air Pollution; D002366:Cassia / Q000737:chemistry*; D004784:Environmental Monitoring / Q000379:methods; D007194:India; D009566:Nitrates / Q000032:analysis*; D012987:Soil / Q000737:chemistry
D000143:Acids; D009566:Nitrates; D012987:Soil
Dry deposition; Experimental and theoretical calculation; Flux; Total nitrate