Evaluation of dry deposition of acidifying N compounds to vegetation
2015
Kumar, Ranjit | Kumari, K Maharaj
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.
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