查询词典 silvicultural

SFI is a public research institution of national importance, with a comprehensive research programme focusing on biological, ecological, silvicultural and spatial aspects of forests and forested landscape including forest ecology, forest physiology and genetics, forest protection, ecology of forest fauna and hunting, dendrochronology, dendroecology and dendroclimatology, forest inventory, remote sensing and geographic information systems in forestry etc.

该研究所是国家重点研究机构，主要致力于生物学、生态学、造林学和森林空间森林覆盖等领域的研究，其研究范围涉及森林生态学、森林生理学和遗传学、森林保护、森林动物生态学和狩猎、树木年代学、年轮水文学、年轮气候学、森林资源调查、森林遥感和地理信息系统等。

Based on the test of slash pine,this paper studied the radial and longitudinalvariation law of the wood properties,furthermore,this paper also dealt with theeffect of two silvicultural measures on the physical and mechanical properties ofthe slash pine.The research result was used to provide the scientific theoreticalbasis for the reasonable exploitation and directive breeding of the slash pine.

本文以人工林湿地松为试验材料，详细研究了湿地松各材性指标的径向和纵向变异规律，并在此基础上，深入研究间伐处理、种植密度处理两种培育措施对人工林湿地松物理、力学性能的影响规律，为人工林湿地松的合理利用和定向培育提供科学的理论依据。

Based on the test of 23-year and 10-year old slash pine,this papersystematically studied the effect of different thinning intensity and different densityof plantation on the wood qualities and properties.Many statistical means such asanalysis of variance and cluster analysis were used to analyze the difference of thewood qualities and properties among the different silvicultural measures.

本文分别以23年生、10年生的湿地松为实验材料，全面地研究了不同间伐强度、不同种植树密度对人工林湿地松材质材性的影响规律，并利用方差分析、聚类分析等统计手段，定量地分析了不同栽培措施之间材质、材性的差异。

The paper researches suitable site and plantation growth for six silvicultural tree species in Maoershan Forest Farm of Northeast Forestry University by using the optimal separated method.

本文采用最优分割法对东北林业大学帽儿山林场6个主要造林树种的合理立地边界及其在各地形条件下的生长状况进行了研究。

The study aimed to investigate horizontal variations in photosynthetic photon flux density and transmittances under a Taiwan red false cypress (Chamaecyparis formosensis Matsum) canopy as the basis for ecological and silvicultural researches.

本研究主要目的为探讨红桧人工林内光合光子流密度之空间变异，以及不同冠层密度下透光率之变化，作为生态学及育林学相关研究之基础。

Silvicultural production mechanization is to increase forest cover, protection and an important way to expand the forest resources.

营林生产机械化是提高森林覆盖率，保护和扩大森林资源的重要途径。

Tree height structure (as a consequence of silvicultural system), and c.

树高度结构，和 c。

On the ecosystem health, definitions from utilization and ecosystem views are introduced, the contents and difficulties in assessing it are discussed. On the biodiversity enhancement, the relationship between forest structural complexity and forest biodiversity are discussed, the significance of old growth structure are highlighted, and measures of changing forest structure to promote forest biodiversity are put forward. On the landscape planning in forest management, some patterns, theoretical foundations and models are introduced, especially three conceptual models, i.e., key habitat\|corridors model, nature landscape model, and supportive features model. On the alternative silvicultural systems, reasons for developing alternative silvicultural system by mimic of nature disturbance are discussed, and some advanced techniques and their ecological basis are noted. Finally, on the ecosystem service, its contents and importance of assessment are illustrated.

关于森林生态系统健康，讨论了不同角度对生态系统健康的定义和不同层次上的生态系统健康的内容及评价生态系统健康的困难所在；②关于森林生物多样性，探讨了森林结构复杂性与生物多样性的关系，老龄林结构对森林生态系统的意义和作用，以及如何通过经营调整结构促进生物多样性；③关于森林经营的景观规划，描述了进行景观规划的途径、理论和模型，并对三种概念模型进行了介绍；④关于森林经营的替代技术体系，介绍了模拟自然干扰设计替代技术体系的原理，分析了替代经营技术体系产生的原因和有关最新技术研究进展；⑤关于森林生态系统服务，讨论了生态系统服务的基本内容和评价在森林生态系统管理中的重要意义。

For different silvicultural measures, the mechanical properties of Pinus sylvestris plantations were measured and analyzed. The results showed that the effect of silvicultural measures on many mechanical properties of Pinus sylvestris Plantations were not significant..In order to increase the mechanical properties of wood, growth-promoting and then get the better structure building lumber and glued lamination board, the stands on south slope or at the down of slope, and with density of 1.5m×1.0m, properly thinning could be selected. Results of this study can provide a theoretical base and good guidance for oriented breeding of Pinus sylvestris plantations.

摘 要：对不同培育措施的人工林樟子松木材力学指标进行测试和分析，结果表明：不同的培育措施（初植密度、间伐强度、坡向、坡位）对樟子松人工林木材的绝大多数力学强度指标有显著的影响，可选择阳坡、坡下、1.5m×1.0m、轻度间伐林分进行定向培育，来提高木材力学强度性能，从而加快林木生长，培育高产、优质的结构、建筑用材及胶合板材林。

This course is an attempt to give the students the basic idea and method of forest management in order to prepare the management plan; Place of forest management in forestry; Content of forest management; Guide principles of forest management; Sustained working; Silvicultural system; Forest yield; Increment; Volume increment; Quality increment; Price increment; Total price increment; Forest maturity; Indicating percent; Productive stage; Physical rotation; Technical rotation; Rotation of maximum volume yield; Highest forest rent rotation; Financial rotation; Cutting cycle of selection system; Normal forest; Normal distribution of age classes; Normal arrangement of stands; Normal increment; Normal growing stock; Normal yield; Improvement of actual forest; Reserve forest; Reserve fund; Planning and plan of forest management; Forest regulation; Area allotment; Volume allotting method; Volume frame work; Area-volume combined frame work; Growing stock; Utilization percent method; Difference method; Pure age-class; Growth method; Control method; Forest subdivision; Forest surveying; Forest survey; Certainty of future policy of forest; Selection of species; Decision of silvicultural system; Decision of rotation; Regulation of future yield; Preparation of management plan; Working the plan; Control and revision of management

本课程之目的为使学生了解森林经营之基本观念及方法，以期编订经营计划，课程包括森林经营学在林学上之地位、森林经营学之内容、森林经营之指导原则、保续作业、森林作业法、森林收获、生长、材积生长、形质生长、腾贵生长、总价格生长、林木成熟期、指率、生产期、自然轮伐期、工艺轮伐期、材积收获最多轮伐期、森林纯益最大之轮伐期、财政轮伐期、择伐林之回归期、法正林、法正龄级分配、法正林分排列、法正生长、法正蓄积、法正伐采额、现时林之改良、预备林、预备金、森林经营上之规划及计划、收获预定、面积配分法、材积配分法、材积平分法、折衷平分法、蓄积法、利用率法、较差法、纯粹龄级法、生长量法、稽核法、森林区划、森林测量、森林调查、将来森林经营方针之确定、树种之选定、作业法之决定、轮伐期之判定、将来收获之预定、经营管理计划之编订、计划之执行、经营管理计划之稽核与检订。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。