Frecvenţa precipitaţiilor acide în ecosisteme forestiere din România în perioada 1998-2004 [Frequency of acid rains in Romanian forest ecosystems in period 1998-2004]

Abstract

Considering that “acid rain” is a rain with pH<5,5, the frequency of months with acid rains in open field and under the wood canopy was studied in forest ecosystems located in North of Romania (coniferous) and South Romania (decidous), for the period 1998-2004. The results allowed to establish that the decidous stands have a greater capacity than the coniferous stands to reduce frecquency of months with acid rains under the canopy, compared with those from the open field. A statistical tendency of increasing for the frequency of month with acid rain in the open field was observed at sites located at more than 1000 m altitude. For the studied period (1998-2004), this frequency grew each year with about 8 % at Rarau (1100 m) and Fundata (1460 m). In time, this tendency may produce the cation leaching and may determine the reduction of the growing process of trees. At altitudes lower than 800 m, the frequency of month with acid rain in the open field did not register any tendency or registered a tendency of decrease (at Stefanesti, located at altitude <100 m)

Keywords

• rainfall
• precipitation
• throughfall
• acid