松嫩草甸水淹恢复演替过程中羊草和寸草苔无性系种群的相互动态

The mutual dynamics of clonal populations of two species: Leymus chinensis and Carex duriuscula in the process of restoration succession after the flooded meadow in the Songnen Plains of China

羊草和寸草苔均是典型的无性系植物。在松嫩平原水淹恢复演替过程中,从5个大小不同的羊草无性系斑块的中心至外围,羊草分蘖株的数量和生物量均逐圈层减少,寸草苔则逐圈层增加。羊草平均单株生产力有逐圈层减弱,寸草苔则逐圈层增强的趋势。从半径0.5～5.0m无性系斑块中心的羊草分蘖株数量逐渐增加,寸草苔则逐渐减少,呈现出羊草定居时间越长,斑块中心羊草分蘖株的数量越多,寸草苔则越少的趋势。随着水淹恢复演替的进程,羊草正在并将最终取代寸草苔而成为草甸群落的优势种。

Leymus chinensis and Carex duriuscula are typical clonal plants. In the process of restoration succession after the flood in the meadow in the Songnen Plains of China, the number of and the biomass of the tillers of L. chinensis population decreased with the circles, those of C. duriuscula population increased with the circles from the center to the edge of five clonal patches with different radius. The productivity of per tiller of L. chinensis weakened and that of C. duriuscula intensified gradually at the same time. The number of the tillers of L. chinensis increased and C. duriuscula decreased gradually from the center of 0.5 m to 5 m patches,which presented that the longer the settling time of L. chinensis was,the more L. chinensis was, the less C. duriuscula was in the center of every clonal patch. With restoration succession after the flooded meadow in the Songnen Plains of China, L. chinensis was replacing and would replace C. duriuscula ultimately, and L. chinensis would become the dominant species of the community.