造林

It is closely related to other successive courses such as Forest Ecology, Silviculture, Forest Management, Natural Reserve Conservation and Wildlife Protection.

树木学是林学专业的一门重要的专业基础课，它与森林生态学、造林学、森林经理学、自然保护学等都有着密切的关系。

At present, the traditional craft of silviculture planning and design and management in Beijing have laged behind, and it is unable to meet the needs of developing rapidly in the modern forestry.

对于林业生态工程建设中的造林规划设计及管理，目前以传统的作业和管理方式已经日渐落后，无法适应现代林业迅速发展的需要。

CHANGES IN MANAGEMENT, HARVESTING, SILVICULTURE AND MONITORING

变化包括经营，砍伐，造林和监督

For the annual investigation and design of regeneration and silviculture, conforming the

地条件。林业局森林调查设计队负责林业局每年更新造林作业的调查和设计工作，确定造林地

The afforestation practices demonstrated that without guidance of system theory, the efficiency of the forestry production had been influenced, and the further development of silviculture was also restricted to some extent.

人工造林实践表明，缺乏系统思想和理论的指导不仅给林业生产造成了一定不利影响，同时还会限制森林培育学科的进一步发展。

The two tree water consumption characteristics, Populus simonii and Robinia pseudoacacie, and the interactions mechanism with environment factors were both studied at the level of leaf and singletree in terms of the modern technology of heat pulse sap flow and thermal dissipation sap flow probe. The two main purposes of study are to provide the science evidence in estimating the ecologic water consumption rules and to arrange better densities of the two tree species stand.

本文以北京市官厅库区水源涵养林的主要造林树种：小叶杨、刺槐为研究对象，采用当前国内外最先进的热脉冲式树干边材液流测定技术和热扩散式树干边材液流测定探针测定技术，从叶片和单株水平上探讨了刺槐和小叶杨的蒸腾耗水特性以及它们与环境因子之间的影响机理，其结果不仅可为更精确地估计生态用水定额提供科学依据，而且也可为该区域这两种树种的选择及其合理林分的密度起到一定的指导作用。

The contents,accumulation and distribution as well as biological cycles of 9 nutrient elements were studied in four 16-year-old experimental Slash Pine plantations with different density at Lufeng Mountain Forestry Farm in Guangxi Autonomous Region.

在广西禄峰山林场16年生4种不同造林密度的湿地松试验林地内，对N、P、K、Ca、Mg、 Cu、Fe、Zn、Mn 9种养分元素的含量、积累、分配和生物循环以及它们与密度间的关系进行了研究。

The natural distribution, resource situation, economical and ecological values,biological and ecological characteristics, study progress and development of the bio energy tree species Styrax tonkinensis were summarized in this paper.

概述了优良生物质能源树种东京野茉莉的天然分布，资源状况，经济和生态价值，生物生态学特性，研究现状和发展前景等；开展了东京野茉莉采种，育苗，造林技术试验；测定了东京野茉莉种子含油率，油脂主要成分等。

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。

Reforestation and tree-planting programs are under way.

重新造林和植树项目正在进行中。

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。