查询词典 selection forest

The research progress in genetic linkage map construction of forest tree species both at home and abroad were reviewed in the paper.Two main problems involved in the field were discussed.One was the limitation of the number of individuals of mapping populations and the other was the random markers mostly employed by the majority of studies.These problems have resulted in crossing combination specificity in the constructed maps and the QTLs located on the basis of the maps.As a result,the QTLs discovered up to now have low credibility and poor practicability in marker-assisted selection.

本文就目前国内外林木连锁遗传图谱领域的研究进展进行了综述，指出了该领域研究中存在的主要问题，即一方面是作图个体的数量有限，另一方面是采用的标记以随机标记为主，导致了建成的图谱以及利用图谱获得的数量性状基因位点信息具有杂交组合特异性，造成了QTLs的可信度和在林木遗传改良以及标记辅助选择中的实用性降低等现象。

Road line selection is a very important factor in an optimal forest park planning.

道路是森林公园的重要组成部分，也是一项主要的基础设施。

The development strategies were brought forward from multiple categories of forest composition, selection of tree species and their configuration, optimization and reconstruction of stand structure.

该文从多林种、多树种配置，造林树种选择和林分结构的优化与调整方面提出现有林的发展策略，并提供了现有林的经营类型和对应各种立地类型的造林树种。

Introduction: the paper selection of European forest sustainable supply of high quality wood pulp, paper and white durable stability, ultraintense, brightness between the light copper and powder.

简介：该纸选用欧洲可持续供应森林的优质木浆制成，纸质耐久稳定，超强亮白，亮度介于光铜与亚粉之间。

urban forest ; selection of tree species ; planting trees on the sites best suited ; priority of ecological benefits ; principles

笔者针对这些问题进行研究，以期能提出有效解决这些问题的原则和方法。1 适地适树原则[1]在森林培育学中，适地适树

Study on the Analysis of the Skidding Production Optimization Selection in Southern Collective Forest Regions;2. Study on the Reversal Direction Arisen When 50 Crawler Is Skidding at Steep Slopes;3. Skidding method can be determined by production efficiency and ecological environment.

介绍了目前国内外生态型伐区集材概况及类型，较详细地分析了6种生态型伐区集材模式的优缺点及适用条件，指出中国山地伐区应广泛推广直角横向集材和双向循环索道集材方式。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。