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 study of the Pinus tabulaeformis f. shekanensis is of importance to the phytoecology.
油松的研究对油松的植物生态学研究具有重要意义。
The ash content of the Pinus tabulaeformis branches is less than 0.52 % in the northwest margin areas.
城区西北边缘的公园区灰分含量最低，其值小于0 .52 % 。
The relationship of scenic value and tree growth in Finns tabulaeformis stand is the higher DBH, the better vision effect;
油松风景林的美景度与林木生长间的关系，一般胸径较大观赏价值较高，生长势较好林木的观赏效果也较好；
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。
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。
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。
The biggest interception rates calculated by curves were 45% for stands of oaks and miscellaneous trees, 40% for larch stands, approximated 30% for P. koraiensis and P. tabulaeformis, respectively.
由曲线推算的最大总截留率，杂木林和柞木林为4 5 % ，落叶松林为4 0 % ，红松林和油松林约为30 %。
The biggest interception rates calculated by curves were 45% for stands of oaks and miscellaneous trees, 40% for larch stands, approximated 30% for P. koraiensis and P. tabulaeformis, respectively.
由曲线推算的最大总截留率，杂木林和柞木林为4 5 % ，落叶松林为4 0 % ，红松林和油松林约为30 %。
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