东北羊草草地钙、镁含量特征的研究

本文探讨了东北羊草草地割草场的钙、镁含量特征。研究结果表明：羊草群落中，植物根的钙、镁含量最高，季节变化规律是在生长旺季较高。羊草地上部分钙、镁积累量的季节变化曲线基本为S型，寸草苔和针蔺为双峰型。群落地下部分钙、镁积累量分别占群落总积累量的97.13%和92.08%。群落中钙、镁积累量仅占根层土壤钙、镁贮量的0.05%和0.03%，占根层土壤交换性和水溶性钙、镁贮量之和的52.2%和14.62%。植物各器宫中钙含量和积累量均大于镁。

A STUDY ON Ca, Mg CONTENT IN ANEUROLEPIDIUM CHINENSE GRASSLAND IN NORTHEAST CHINA

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.