红壤典型地区大气硫输入的干沉降通量研究——以江西红壤站为例

Dry deposition flux of air sulphur at a typical red soil area-with Jiangxi Red Soil Station as example.

在江西 (鹰潭 )红壤典型地区农田下垫面上进行大气SO2 、硫酸盐 (SO2 -4 )的浓度采样 ,利用阻力模式计算SO2 和SO2 -4 的干沉降速度 ,估算大气S输入农田生态系统的干沉降通量 .结果表明 ,农田下垫面上SO2 和SO2 -4 干沉降速度的平均值分别是 0 4 3、0 2 3cm·s-1.干沉降速度具有明显的日变化特征 ,一般白天大于夜间 ,午后出现最大值 .大气S输入农田生态系统的半年干沉降通量为 6 7g·m-2 .

The concentrations of SO\-2 and SO\+\{2-\}\-4 in air were observed on farmland at Yingtan,the typical red soil area of Jiangxi Province.Based on data provided by the automatic meteorological station of China Ecosystem Research Network,the dry deposition velocity of SO\-2 and SO\+\{2-\}\-4 was calculated using a resistance model,and the dry deposition flux of sulphur from the atmosphere to the farmland ecosystem was estimated.The results showed that the average dry deposition velocity(Vd)of SO\-2 and SO\+\{2-\}\-4 was 0\^43 and 0\^23cm·s\+\{-1\},respectively.The Vd of SO\-2 and SO\+\{2-\}\-4 in the daytime was significantly higher than that at night,and the highest velocity occurred in the afternoon.The total annual dry-deposition flux of sulphur inputted to farmland ecosystems was 13\^4g ·m\+\{-2\}.