1.
Study on Precipitation Hydro-chemical Characteristic of Different Stages of Betula platyphylla Secondary Forest
不同林龄白桦次生林降雨水化学特征研究
2.
Soil properties and water conservation function of Betula platyphylla secondary forest with different stand ages
不同林龄白桦次生林土壤特性及其水源涵养功能
3.
The Seed Bank in Logging Gaps in Populus davidiana-Betula platyphylla Secondary Forests in Changbai Mountain
长白山杨桦次生林采伐林隙种子库特征
4.
Soil CO_2 released effluxes of Birch forest in the Changbai Mouhtains
长白山天然次生白桦林土壤CO_2释放通量研究
5.
Growth Process and Succession Trend of Polar-Birch Secondary Forests in Changbai Mountain,Northeast China
长白山杨桦次生林生长过程与演替动向分析
6.
Effect of Soil Properties in The Natural Secondary Forest by Planting Conifer and Reserving Broad-leave
栽针保阔对天然次生白桦林土壤养分的影响
7.
medium-sized birch of eastern North America having white or pale gray bark and valueless wood; occurs often as a second-browth forest tree.
北美东部的一种中等大小的桦树,具有灰色或白色树皮,木材无价值；次生林中常见。
8.
Pattern analysis of different populations in natural secondary forest of Betula davurica in mountainous area of Beijing
北京山区黑桦天然次生林不同种群的格局分析
9.
Comparison of Biomass of Betula alnoides Plantations and Natural Secondary Forests in Xishuangbanna
2种西南桦人工林与同地2种天然次生林的林分生物量对比研究
10.
Study on Growth Models with Artificial Neural Network for Betula Platyphlla Plantation
白桦人工林生长的人工神经网络模型研究
11.
Study on the Artificial Neural Network Model of Individual Tree Growth in the Betula platyphlla Plantation
白桦人工林单木生长的人工神经网络模型研究
12.
Spatial Pattern Analysis in a Natural Secondary Betula-Abies Forest at Sub-Alpine Area of Western Sichuan, China
川西亚高山红桦—岷江冷杉天然次生林的空间格局分析
13.
Primary Study on the Major Community Types of Betula luminifera Secondary Forests in Northwest Guizhou
黔西北地区光皮桦次生林主要群落类型初步研究
14.
Study on Natural Regeneration and Seed Germination Characteristics of Betula Albo-sinensis at MT.Taibai, China;
太白山红桦林自然更新障碍及种子萌发生理的研究
15.
Management Techniques of Natural Birch Forests and Its Objective management
天然白桦林经营调控技术及目标管理
16.
"They drove in a black limousine, past groves of birch trees and endless rows of identical new buildings."
他们驾着一辆黑色大轿车,经过一片片白桦林,穿过一排排鳞次栉比的新建筑。
17.
Extraction of Betulin from Changbai Mountain Birch Bark, Synthesis of Its Derivatives and Study on Their Bioactivities;
长白山白桦树皮中白桦脂醇的提取、衍生化及生物活性研究
18.
Study on Gap Characteristics and Stability of Betula Albo-sinensis Forest in Taibai Mountains;
太白山红桦林林隙特征及其稳定性的研究