在30年的生长中，北美的板栗林失去了物种——高大的栗树——的每个标本，这是以前板栗林中非常重要的一块。
In the space of 30 years the old-growth chestnut forest in North America lost every specimen of a species — the mighty chestnut — that formerly constituted a significant hunk of the forest's mass.
探讨采用高密度超短轮伐期栽培技术种植的一年树龄中林杨全树带皮材，NSSC法制浆及生产新闻纸的可行性。
The feasibility of making newspaper with NSSC pulping by using one-year-old zhonglin aspens which was cultivatel in high density in supershort cutting period was studied.
是采取诱杀措施的重要时期；诱饵树的设置应以通风向阳的林道旁或郁闭度较小林分的林窗中为宜，距寄主植物有一定距离的林缘更佳。
Setting up alluring tree should be on sides of ventilative and sunny forest road or in forest windows with a less crown density.
为了更准确地描述树高与直径的关系，文章综合分析了广泛应用于林窗模型中的四个数学方程，即二次曲线、幂函数方程、理查德方程和单分子方程。
Parabolic curve function, power function, Richards equation and single molecular equation, related tree height to diameter at breast height and widely used in forest gap model, were analysed.
为了更准确地描述树高与直径的关系，文章综合分析了广泛应用于林窗模型中的四个数学方程，即二次曲线、幂函数方程、理查德方程和单分子方程。
Parabolic curve function, power function, Richards equation and single molecular equation, related tree height to diameter at breast height and widely used in forest gap model, were analysed.
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