stem density

Stand density was reduced from 404 to 387 stem/ hm 2, and basal area from 44 83 to 43 79 hm 2.All species in high canopy layer except Acer mono decreased in number of stems.

林分密度从404株／hm2降至387株／hm2，而基础面积从44.83hm2降至43.79hm2。除色木槭之外，冠层林木的株数降低。

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Excellent clones are selected for Beijing, through the economical weights analysis and index selection of industrial timber properties such as volume increment, timber total density, fiber length and stem straightness. The comprehensive breeding gain of industrial timber can be higher than 20%.

经过材积生长量、木材全年密度、纤维长度、主干通直度性状经济权重分析和指数选择，为北京点选出8个优良无性系，平均综合育种增益达20%以上。

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METHODS: Femoral bone marrow of the rats was extracted under aseptic condition. Bone marrow mesenchymal stem cells ( MSCs) were isolated with density gradient centrifugation.

方法：无菌抽取大鼠股骨骨髓，采用密度梯度离心法分离骨髓间充质干细胞。

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Results CT of brain stem hemorrhage showed high density hemorrhage and hematoma image.

结果脑干出血CT表现为脑干高密度出血及血肿影.

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Differences in Morphological Characteristics and Seeding Quality of Melia azedarach Seeds from Different Provenances Provenance Variation in Growth, Stem-Form and Wood Density of Masson Pine at 24-Year-Old and the Provenance Division

不同种源苦楝种子形态特征和播种品质差异研究24年生马尾松生长、形质和木材基本密度的种源变异与种源区划

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