摘 要： 以19年生实生银杏为研究对象，每木检尺，研究了银杏树冠的结构

Abstract: A 19-year-old of ginkgo as the research object, for each tree a sizing study the structure of a lateral branch Factor Ginkgo crown layer resistance, the number, and based impact diameter on the diameter of the trunk and the stem form the results are as follows: (1) Ginkgo layer on the trunk of a collateral distribution and uneven, leading to different parts of the main differences in the distribution of growth, with the increase in performance of canopy height, the number of branches presented a "small year on year in the vertical direction crown big "of the wave changes; collateral layer a layer spacing between 0.58-0.82 m; the number is small collateral certain layer, the layer spacing of the upper layer is large, and vice versa. (2) and the difference in the number of collateral and basal diameter of the crown caused by different levels of a trunk diameter and volume of the uneven distribution, resulting in changes in the trunk form quality, showing a lateral branch with a base diameter of canopy height increased presented "increase - decrease," the trend, and a lateral branch of the central larger diameter crown-yl; each of a different degree of collateral so that the upper layer tapers trunk side branches. As an upper layer of the lateral branch shift collateral layer so shaped chest high rate showed a reduced tendency. Growth of the upper and lower portions assigned trunk diameter increase of the diameter of a lateral branch.

Abstract: With 19 years of raw ginkgo as the research object, per wood gauge, the influence of the structural factor of ginkgo tree crown on the diameter and dry shape of the trunk, the main results are as follows: (1) the layer and imbalance of the distribution of the first-level side branches on the Ginkgo trunk, resulting in the difference in the distribution of growth in different parts of the trunk. The performance shows that with the increase of the height of the tree crown, the number of first-level branches in the vertical direction of the crown shows a "one-year small one-year-large" fluctuation spacing, the layer spacing of the first-level side branches is between 0.58-0.82 meters, and when the number of a layer side branches is small, the layer spacing above the layer is larger, and vice versa. (2) The difference between the first-level side branches and their number and base diameter at different levels on the crown causes the uneven distribution of the trunk diameter and the material accumulation, resulting in a change in the shape of the trunk, which shows the "rise-decrease" trend of the base diameter of the first-level side branch with the increase of the height of the crown, and the base diameter of the first-level side branch in the middle of the crown is larger. Each round of side branches makes the trunk of the upper part of the layer's side branches thinner to varying degrees. With the upward movement of the first-level side branches, the side branches make the chest height rate show a decreasing trend. The growth of the first-level side branch diameter affects the distribution of the upper and lower diameter sour parts of the trunk.

Abstract: Taking the 19-year-old Ginkgo biloba as the research object, the effects of the structure factors of the first-order lateral branches of Ginkgo biloba crown on the diameter and shape of the trunk were studied by measuring the length of each tree. The main results were as follows: (1) the distribution of the first-order lateral branches of Ginkgo biloba trunk was uneven, which led to the difference of the growth distribution in different parts of the trunk, which was manifested as the height of the crown With the increase of the number of first-class branches, the vertical direction of the crown presents a fluctuating change of "one year smaller and one year larger"; the layer spacing of the first-class side branches is between 0.58-0.82 m; when the number of side branches in a layer is small, the layer spacing above the layer is larger, and vice versa. (2) the difference of primary branches and their number and base diameter at different levels in the crown results in the uneven distribution of trunk diameter and volume, which leads to the change of trunk shape and quality, which shows that the base diameter of primary branches increases and decreases with the height of the crown, and the base diameter of primary branches in the middle of the crown is larger; each round of lateral branches makes the main branches in the upper part of the branch The stem thins to varying degrees. With the first level of the lateral layer moving up, the lateral layer makes the chest height rate decrease. The diameter growth of the first branch affects the distribution of the diameter increment of the upper and lower parts of the trunk.<br>