The confirmation method of mature level in uneven-aged forest is an insoluble problem both in forestry theory and forestry production at present.
以林木经济成熟径级确定为例,通过径级价值量被其径级材积除的模式转换办法,解析异龄林林木成熟的确定方法,进而为改善林业生产中异龄林采伐的盲目性提供依据。
According to the statistical features of applied model of diameter distribution in forestry,suitable index distribution,Weibull distribution and β distribution have been chosen to simulate diameter distribution in the actual uneven-aged forests.
根据在林业中已应用的直径分布模型的统计特征,选择适宜于异龄林分直径分布模拟的指数分布、韦布尔分布、贝塔分布模拟现实异龄林分直径分布。
The proportion of the national uneven-aged forests will increase under all these indemnificatory operation rules and measurements.
1998年国家实施天保工程之后,加强了对天然林的保护,南方非天保工程区域的天然阔叶林经营被强制要求采用择伐作业,这些保障性的经营规定和措施使我国的异龄林比重加大,对异龄林的经营管理提出了新的挑战。
A Study on the Evaluating Method of the Site Quality of Uneven aged Broadleaved Forest in Northern Fujian Province
闽北异龄林地位质量评价方法的研究
Discussion on Classification Criterion of Size Class for Uneven-Aged Forest Stands
关于异龄林大小等级划分标准的探讨
Soil heterotrophic respiration in Casuarina equisetifolia plantation at different stand ages
不同林龄的木麻黄林下土壤异养呼吸特征(英文)
Effect of Seedling Age on Tree Growth in Yunnan Pine Juvenile Stand
苗龄差异对云南松人工幼林林木造林当年生长影响的研究
The Difference Analyses of Tree Growth Characteristics Among Provenance of Exotic Loblolly Pine Planted in South of Henan Province of China
河南火炬松种源中龄林生长量、干形特征的差异分析
Variation of Wood Density Among Provenance of Exotic Loblolly Pine Grown in South of Henan Province
河南引种火炬松种源中龄林木材基本密度的变异
The results showed that the water consumption between 4 years old elms and forst had no obviously difference.
结果表明:4龄榆树与林带间荒草地耗水量差异不显著;
Between Korea and Han Nationality Students Age of Sexual Maturity Characteristics of the Physical Differences of JiLin Province;
吉林省朝、汉民族学生性成熟年龄的体质特征差异性研究
Age Discrimination in Employment Act
(美国) 就业年龄差异法;就业年龄差异法
Li Ming is the same age as Wang Lin .
李明的年龄和王林的年龄一样。
The main scourge is middle and able bodied age and the age is reverse to the scale.
竹林以壮、中龄鞭为主 ,鞭龄与鞭级呈反相关 ;
Responses to Simulated Nitrogen Deposition of Different Ages of Eucalyptus Dunnii Young Growth
不同年龄邓恩桉幼龄林对模拟氮沉降的响应
The observation of difference between skeletal age and chronological age with hand and wrist in Chinese Han adolescent
青少年手腕骨骨龄与生活年龄的差异观察
The Different Effects of Isoflurane on Hippocampal Proteome between Adult and Aged Rats;
异氟烷对成龄和老龄大鼠海马蛋白质组影响的差异性研究
Delayed effect of isoflurane on hippocampal proteome after anesthesia in adult and aged rats
异氟烷对成龄和老龄大鼠海马蛋白质组延迟相的差异性影响
Catastrophy causing Stucture and Ways of Forest Fire in Young and Middle Aged Chinese Pine Forest
油松中幼龄纯林林火致灾结构与致灾途径模式
Study on Regeneration cutting Age of Shelter belt in Nongan County,Jilin Province
吉林省农安县农田防护林更新采伐年龄的研究
Studies on the Quantitative Characteristics of Old-growth Population in Pinus Massoniana Lamb. Plantation;
马尾松人工林的老龄林优势种群数量特征研究
