Annual trunk diameters and tree heights were measured in July after initial_girdling and regirdling in Eucommia ulmoides Oliv. And the percentages of fallen leaves in all leaves and burst buds in all buds were est...Annual trunk diameters and tree heights were measured in July after initial_girdling and regirdling in Eucommia ulmoides Oliv. And the percentages of fallen leaves in all leaves and burst buds in all buds were estimated respectively on every autumn or spring. The results indicated that although the tree growth slowed down in the first year after girdling, but in the second year after girdling, the growth of the girdled trees tended to become normalized and up to the third year, it was similar to that of the normal trees. According to its developmental trait after girdling, the authors suggested that optimal girdling of the trees is in every 4 or 5 year intervals. With this method it was able to improve bark production and to protect the resource from extinction as well.展开更多
文摘Annual trunk diameters and tree heights were measured in July after initial_girdling and regirdling in Eucommia ulmoides Oliv. And the percentages of fallen leaves in all leaves and burst buds in all buds were estimated respectively on every autumn or spring. The results indicated that although the tree growth slowed down in the first year after girdling, but in the second year after girdling, the growth of the girdled trees tended to become normalized and up to the third year, it was similar to that of the normal trees. According to its developmental trait after girdling, the authors suggested that optimal girdling of the trees is in every 4 or 5 year intervals. With this method it was able to improve bark production and to protect the resource from extinction as well.
