Abstract:

In order to reveal some strategies in vegetative propagation of Carex lasiocarpa clonal popuation, and to provide the scientific basis for the protection and conservation of wetland plants, the rhizomes of C. lasiocarpa were classified into different age classes by propagation generation number of tillering node. The age structure of rhizomes was characterized in terms of length and biomass, and the pattern of quantitative change in rhizome numbers of different ages was analyzed. The results showed that rhizomes of C. lasiocarpa could live to 9 generations at most. As among the age classes, 2-6 years old were superior in the length and biomass of rhizomes. The rhizomes showed a stable age structure. During the growing season, larger changes taken place in 1 age class and 9 age class of rhizomes. 1 age class of rhizomes began to appear in the fruit and then increased rapidly. The 9 age class of rhizome was death in the late growing season. As among the age classes, 2-5 years old were superior in the dry matter storage per unit length, and 4 age class had the highest value of the dry matter storage per unit length. The final stage of the growing season was an important period for nutritional substances accumulation of C. lasiocarpa rhizome population. The rapid growth of 1 age class of rhizomes was advantageous to the population to rapid, adequately occupy or expand to grow space.