This paper intends to understand the stability and mechanism of Betula forest in Mt.
对于太白山地区的桦林,长期以来存在不同观点:孢粉学证据和自然环境下呈现的优势分布皆说明其从地质时期至今,都是作为建群种而稳定存在的;但野外调查数据则表明其种群配置极不均匀,自然更新差,为衰退种群。
Carbon density,storage and distribution in birch forest ecosystem on the forestland converted from farmland;
退耕还林地桦木林生态系统碳素密度、贮量与空间分布
Woodland hydrological effects of birch forests in sub-alpine region of western Sichuan,China;
川西亚高山桦木林的林地水文效应
Birch forest,as one of the transitional forests in the succession series of subalpine,middle mountain and hill,is an important component of the forests in this region.
青藏高原东北边缘山地位于我国东部季风区、西北干旱区与青藏高原高寒区的交汇地带,桦木林是该地区森林的重要构成成份,是亚高山、中山、低山地带森林演替的过渡性森林之一。
Throughfall and stemflow in a Betula platyphylla forest at the subalpine of Western Sichuan;
川西亚高山白桦林穿透雨和茎流特征观测研究
Soil physical properties and leaf photosynthetic characteristics in three stands,Betula platyphylla forest,Quercus liaotungensis forest,and Betula platyphylla-Quercus liaotungensis mixed forest,which were located in the secondary zone of Ziwuling Forest of the Loess Plateau,were studied.
对黄土高原子午岭次生林区白桦林、辽东栎林和白桦-辽东栎混交林3种林分的土壤物理特性和叶片光合特性进行了研究。
The tree height, diameter at breast height and growing stock of Betula platyphylla forest stand are lower in the Bashang Plateau than those in the Baxia Mountain in northern Hebei Province and eastern Inner Mongolia.
河北北部坝上与坝下白桦林比较 ,无论是林分的树高、胸径、蓄积量 ,还是白桦的高生长、直径生长、材积生长 ,都是坝上小于坝下 。
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。
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。
Dynamic characteristics of soil collembolans in the birch forest of Xiao xinganling;
小兴安岭白桦林土壤跳虫的动态特征
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
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
Study on Water Conservation and Hydrochemical Characteristic of Different Stages of Betula Platyphylla Forest
不同林龄白桦林水源涵养及水化学特征研究
Results of this study provide a theoretical basis for the oriented cultivation of poplar-birch natural forests.
这为杨桦林的分类定向培育提供了理论的依据。
HABITAT UNDER BIRCH-ASPEN FOREST AND NATURAL RECRUITMENT OF KOREAN PINE
杨桦林下的生境条件与红松天然更新的研究
Seasonal changes of soil respiration in Betula platyphylla forest in Changbai Mountain, China
长白山白桦林地土壤呼吸的季节变化(英文)
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
Infestation of Betula platyphylla by Anoplophora glabripennis and Its Control Using Insecticides
光肩星天牛对白桦林的危害及药剂防治效果
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
The water-holding capacity of litter layers in the forests of Larix principis-rupprechtii and Betula albo-sinensis in Liupan Mountain and their rainfall interception process
六盘山华北落叶松林和红桦林枯落物持水特征及其截持降雨过程
Study on Nutrient Use Efficiency in the Mixed Forest with Betula luminifera and Cunninghamia lanceolata
光皮桦杉木混交林养分利用效率研究
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
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
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
A Feasible Study on the Potherb Base Construction in Huanan Forestry Bureau;
桦南林业局山野菜基地建设可行性研究
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
Geologic features and prospecting direction of Xinglong W-Mo deposit,Huadian,Jilin Province
吉林省桦甸兴隆钨钼矿床地质特征及找矿方向
An Analysis of the Growth Effect of Young Betula luminifera Plantation under Different Site Conditions
光皮桦人工幼林不同立地条件生长效应分析