The vertical movement of soil water and major ions in topsoil of secondary forests were investgated by using D2O and 15NH4Cl as tracers of water and nutrient elements, respectively. Undisturbed soil columns were collected with cylinders made of vinyl chloride pipe in different stands. The rain solution was dropped uniformly on the column by using the artificial rainfall equipment in twice. The artificial rainfall was continued for 10 h at constant intensity of 4 mm/h. At the second time of rainfall, the tracer solution labeled with D2O and 15NH4Cl applied on the column. The concentrations of Cl-, Mg2+, and Ca2+ increased with the D2O discharge and only small quantity of 15NH4+-N moved to the lower horizon on the Brown forest soil columns. The downward velocity of the D2O-tagged water agreed approximately with that of Mg2+ and Ca2+. But large amount of the 15NH4+-N was discharged with the D20-tagged water on the column that was collected in the forest floor removal stand. In spit of heavy water discharging, the concentration of Cl- in discharged soil solution did not increase obviously in Andosol column because of the effect of anion absorption into the soil.
|Number of pages||8|
|Journal||Nihon Ringakkai Shi/Journal of the Japanese Forestry Society|
|Publication status||Published - Dec 1 1996|
- DO-tagged soil water
- Secondary forest
- Vertical movement of soil water
ASJC Scopus subject areas