Study on the Precipitation Chemical Elements Property of the Water Resources Protection Forest in the Miyun Reservoir Watershed, Beijing

摘要

The paper study on the precipitation chemical elements of Robinia pseudoacacia, Pinus tabuleaeformis and Costarica mollissima water resource protection forest in the Miyun reservoir watershed. It results show that total precipitation chemical elements amount was 12. 0011 mg · L~(-1) and its quantity greatly varied in the mainly rainfall period. To list the sequence of the water elements concentration of the precipitation is follows: Ca > N > K > Mg > Na > P > Fe > Zn > Cu > Mn. The chemical elements of through-fall and stem-flow varied in different direction of the three type forests, but the total chemical elements content of the through-fall and stem-flow of the three type forests increased in comparison with the precipitation chemical elements content. Through-fall total chemical elements concentration of the Robinia pseudoacacia, Pinus tabuleaeformis and Castanea mollissima forests are 46.1924 mg · L~(-1), 20.6135 mg · L~(-1) and 17.1105 mg · L~(-1), respectively. Stem-flow total chemical element concentration are 61.5862 mg · L~(-1), 73.3235 mg · L~(-1) and 35.5074 mg · L~(-1), respectively.