The Study Of Clonal Population And The Adaptability To Light Environment Of Robinia Pseudoacacia

Robinia pseudoacacia L. (black locust), one leguminous plant belongs to Robinia genus of Papilionoideae, which characters with high adaptability, rapid growth, enduring menace of drought, infertile soil and salt. On current, black locust has the largest afforestation area in broadleaf trees and the largest timber accumulation in Shandong province, and the largest area in north of Yangtse River. As a perfect hybrid planting and a pioneer tree species in restoring vegetation, black locust is very valuable in restoring vegetation and ecological building in temperate zone of China. Currently, most studies mainly concentrate in the technology of afforestation and the function of it in ecosystem. Black locust is a typical clonal arbor, and clonal growth is the main regenerate way in field forest, but little study is on clonal growth and clonal integration of this species. So it is very important to study the dynamics, structure and distribution pattern of clonal population; the mechanism of clonal growth; the morphological plasticity of ramets; leaflet movement and effect of light on ramets.This study investigats black locust forest and set a fixed sample to study population structure and dynamics of black locust clone. The result indicates that the clone population has relative stable and pyramidal number structure, constituted of abundant infancy daughter ramets with high death rate, and few adult daughter ramets of little death rate. Clones produce daughter ramets at high age stage and the number of daughter ramets is ascending. The diameter at ground height (DGH), Height and canopy width of genet are significantly larger than those of daughter ramets. The growth rate of height and canopy width is accelerated at infancy stage, but relatively stable at adult stage. The growth and dynamics of daughter ramets are affected by...