Effects of Plant Debris Leachates on Ca2+ Leaching from Soil Column
植物残体分解液淋洗对土柱 Ca2+ 淋失量的影响

The effects of plant debris decomposition leachates of alfalfa, leymus and artemisia, representative plants of North China grassland, on Ca2+ concentration were studied by soil column experiment. Results showed that gross Ca2+ loss was dependent on plant debris type and decomposition period. Ca2+ lost most in soil column leached by earlier decomposition leachate of leymus debris, meaning more dissolution of soil CaCO3 in the column. Whereas the dissolution was the least in soil column leached with earlier decomposition solution of alfalfa. These results indicated that Ca2+ concentration in soils will change under vegetation alteration naturally or artificially. In this case, CaCO3 precipitation/dissolution process could be impacted and the balance of soil inorganic carbon pool would change accordingly.