Natural forest stand structure of Pinus tabulaeformis was studied.
对油松天然林的林分结构进行了研究。
The key techniqure to improve the survival and growth of Pinus tabulaeformis on dry south sides in lower rocky mountain in North China is to keep water for raising soil moisture.
在华北石质低山干旱阳坡，提高油松植苗造林成活率及生长量的关键，在于蓄水保墒。
Based on survey resources in the past years, natural forest stand structure of Pinus tabulaeformis in Machibei was studied.
依据历年调查资料，对麻池背油松天然林的林分生长结构进行了研究。
Some resin containing cells are present in parenchym of cortex in shoot apex and xylem parenchym of stem in Pinus tabulaeformis .
油松茎端的皮层薄壁组织和幼茎木薄壁组织中具含树脂细胞分布。
The sap flow velocity of Quercus variabilis was 5~10 times higher than that of the Pinus tabulaeformis on a monthly average basis.
栓皮栎月平均树干液流速率较油松的月平均树干液流速率高5-10倍。
Recent years has witnessed the success of establishing Pinus tabulaeformis tree-belt in purpose of wind-breaking and sand-fixing in this area.
为了有效地防风固沙，近些年在这里成功地营建了油松林带。
The result showed that the yellow and withered pine needles of Pinus tabulaeformis were caused by the serious damage of Cinara pinitabulaeformis Zhang et Zhang.
调查结果表明，承德避署山庄及其周边地区的油松针叶大量枯黄，侧枝枯死或整树枯死是由于松大蚜的严重危害所致。
Compared to P. tabulaeformis, the height and diameter growth and volume of P. ponderosa have good relativity, and correlation value was more than 0.9, but P. tabulaeformis was only(0.583).
在树高、胸径和材积3个生长指标上，美国黄松具有很好的相关性，相关系数均在0.9以上；而油松的树高与胸径相关系数仅为0.583。
Compared to P. tabulaeformis, the height and diameter growth and volume of P. ponderosa have good relativity, and correlation value was more than 0.9, but P. tabulaeformis was only(0.583).
在树高、胸径和材积3个生长指标上，美国黄松具有很好的相关性，相关系数均在0.9以上；而油松的树高与胸径相关系数仅为0.583。
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