Abstract:

Biomass accumulation, allocation pattern and dynamics interspecies competition of Glycyrrhiza uralensis and Caragana microphylla under different density and mixed planting proportion were studied. The results showed: Both average individual biomass decreased in mixed planting. Effects on C. microphylla was greater than that on G. uralensis. Root and individual biomass of mixed planted G. uralensis were decreased by 18.12% and 14.52% respectively, influences of underground part suffered was greater; At the same time, root and individual biomass of mixed planted C. microphylla were decreased by 36.51% and 44.74% respectively, infuluences of aboveground part suffered was greater. Different of biomass of root, stem, leaf and individual weren't significant between pure and mixed planted G. uralensis, while significant or high significant for stem, leaf and indivadual of C. microphylla. Relative yield total biomass of them decreased with growth time prolonging and density increasing under mixed plant condition. They showed a accreted relationship in low mixed density and repelled relationship in high mixed density because of limited resources, which repelling effects became more obvious with the time prolong. Their interspecies competition rate was different under different mixture proportion. For treatment of C. microphylla bigger proportion (20% G. uralensis; 80% C. microphylla), the interspecies competition rate of G. uralensis was less. For treatment of G. uralensis bigger proportion (80% G. uralensis; 20% C. microphylla) and same proportion, the interspecies competition rate of G. uralensis was bigger. G. uralensis had a bigger competitive advantage than C. microphylla in the seedling period.

Key words: Glycyrrhiza uralensis, Caragana microphylla, interspecies relationship, competitive force, biomass