A STUDY ON Ca, Mg CONTENT IN ANEUROLEPIDIUM CHINENSE GRASSLAND IN NORTHEAST CHINA
东北羊草草地钙、镁含量特征的研究

The characters of Ca, Mg contents of the Aneurolepidium chtnense grassland harvested by cutting in Northeast China were studied. Results showed that, In A. chtnense community, the Ca, Mg concentrations of root were the highest among the organs and were higher in the peak growing season than in other time. The seasonal variation curves of Ca, Mg accumulation of the aboveground biomass of A. chtnense have a "S" shape, while those of Cares duriuscula and Heleocharis acicularis were bimodal. The Ca, Mg accumulations in the underground part of the community were account for 97% and 92% of the total accumulations of the whole community. The Ca, Mg accumulations in the community were account for 0.05% and 0.03% of the total reserves of the soil,account for 52.20% and 14.62% of the soluable+exchangeable reserves of the soil respectively. The accumulation of Ca in all organs of plant was higher than that of Mg.