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1)  Poplar-birch forest
杨桦林
1.
The density of Poplar-Birch forest was studied by using the method of location observation in fixed plots and investigation in temperate plots.
采用固定标准地定位观测和临时标准地调查点面结合的方法,研究了杨桦林的密度,得出了杨桦林的最大密度、最佳密度和最小密度数学模型,确定了杨桦林的最佳经营密度与最低经营密度分别为0。
2.
Low quality Poplar-birch forest is regenerated and tended with the fire of 1500~2000kW/m middle intensity in Sanjiang Plaill during the fire prevention period.
在戒严期内,采用1500~2000kw/m 中等强度火对三江平原地区"残破"的杨桦林进行更新复壮,4年后更新幼树的密度达11400株/hm~2,随后自然稀疏成林,并稳定在9000~10000株/hm~2之间,实现了经济效益与生态效益的统一。
2)  nature [英]['neɪtʃə(r)]  [美]['netʃɚ]
天然杨桦林
1.
The relation of nutrient return revert and density effect of nature poplar and birch;
天然杨桦林营养元素归还量与密度效应
3)  Secondary poplar and birch mixed forest
次生杨桦林
4)  Populus davidiana-Betula platyphylla secondary forests
杨桦次生林
1.
The soil seed bank in logging gaps of different sizes and ages was studied in Populus davidiana-Betula platyphylla secondary forests in Changbai Mountain.
研究长白山杨桦次生林不同大小采伐林隙的土壤种子库特征。
5)  Betula platyphylla and Populus davidiana forests
白桦林和山杨林
1.
Betula platyphylla and Populus davidiana forests of the forest\|steppe ecotone in northern Hebei and eastern Inner Mongolia are abundant in plants,which are,at least,35 families,95 genera and 117 species.
这种斑块状的白桦林和山杨林是森林—草原交错带显著的景观特点 ,也具有较高的生物多样性。
6)  Secondary Populus davidiana and Betula platyphylla forest
白桦山杨次生林
补充资料:和杨郎中贺杨仆射致仕后杨侍郎门生合宴席上
【诗文】:
业重关西继大名,恩深阙下遂高情。
祥鳣降伴趋庭鲤,贺燕飞和出谷莺。
范蠡舟中无子弟,疏家席上欠门生。
可怜玉树连桃李,从古无如此会荣。





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