大气沉降向林地(小叶栎)输入硫素通量的观测

利用中国科学院红壤生态试验站森林小气候观测站(江西鹰潭)逐时气象梯度参数连续自动观测数据,采用阻力模式计算SO₂、硫酸盐(SO₄^2-)粒子的干沉降速率(Vd),结合大气SO₂、SO₄^2-粒子浓度现场测定,研究了该地2年大气硫沉降量.结果表明,2000年大气SO₂和SO₄^2-粒子时年Vd值分别为0.748cm/s、0.665cm/s;2002年分别为0.180cm/s、0.221cm/s.2000和2002年大气干沉降硫(SO₂+SO₄^2-粒子)通量分别为104.6kgS/(hm2a)和140.6kgS/(hm2a),SO2干沉降是大气干沉降主要贡献者,占98.38%和97.2%;大气沉降硫总量分别为150kgS/(hm2a)和185kgS/(hm2a);可见大气干沉降是大气硫沉降主要贡献者,分别占70%和76.2%.

Observation studies on the atmospheric sulphur deposited input flux to (Quercus Chenii) forestland

Atmospheric SO2 and SO42- particle dry deposition velocities (Vd) were calculated adopting resistance model and applying continuously automatic observing data of hourly meteorological grade parameter at forest small meteorological observation station, Experiment Station of Red Earth Ecology (Yingtan, Jiangxi), Chinese Academy of Sciences, the atmospheric sulfur deposition amount into the land in two years was studied with combining the field determination of atmospheric SO2, SO42- particle concentrations. The annually average Vd of SO2 and SO42- particle was 0.748cm/s and 0.665cm/s in 2000, and 0.180cm/s and 0.221cm/s in 2002 respectively. The deposition flux of sulfur (SO2 SO42- particle) was 104.6kg S/(hm2a) in 2000 and 2002 respectively, SO2 dry deposition as the main dedicator of the atmospheric dry deposition occupying 98.38% and 97.2%; and the total amount of the sulphur deposited was 150kg S/(hm2a) and 185kg S/(hm2a) respectively. It is clear that the atmospheric dry deposition is the main indicator of the atmospheric sulphur deposition, occupying 70% and 76.2% respectively.