造林

This dissertation focuses on the ecological characteristics, breeding techniques and introduction research on Picea mongolica. The results are as follows:(1) The seedlings and young trees take on a cluster distribution with a high, mortality.

因此，通过对沙地云杉的生态学特性及引种进行研究，找出沙地云杉育苗和引种造林方面的限制因子，为科学育苗和引种推广提供科学的方法和依据，为我国沙化地区的生态恢复起到指导作用。

Picea mongolica, which is a characteristic and one of the first afforestation tree species in Inner Mongolia, plays a great role at the vegetation recovery in the desertfied areas.

沙地云杉是内蒙古赤峰地区与锡林浩特的局部地段所特有乡土树种之一，也是沙地造林的首选树种之一，对于恢复沙化土地植被具有重要的意义。

Based on extensive literature review, the introduction and afforestation techniques of Pinus sylvestris var.

通过查阅相关文献，对沙地樟子松的引种栽培及造林技术进行了详细的阐述。

For mature timber stands, the approaches of selection cutting, clear cutting and shelterwood cutting shall be applied respectively in light of different situations.

一成熟的用材林应当根据不同情况，分别采取择伐、皆伐和渐伐方式，皆伐应当严格控制，并在采伐的当年或者次年内完成更新造林

The trees may be cut as a part of a silvicultural thinning.

这些树木可以被砍掉作为造林疏伐的一部分。

Silvicultural treatment is continued at intervals to promote the growth of desirable species.

以后时而进行造林处理，以促进需要的品种的生长。

Silvicultural experiment of different land preparation types was carried out on pigeonpea (ICP 7035) at Luku of Nujiang prefecture.

对印度引进的木豆晚熟品种ICP70 35 ，在怒江六库进行了不同整地方法的造林试验。

Through 7 years study, the variation regulation and model of white poplar were known well, and 3 best seed sources and30 best clones were screened, making the genetic gain more than 22~28 percent, The results presented here provide a scientific foundation for silvicultural division.

经过7年的研究，摸清了毛白杨的变异规律及模式，筛选出3个种源，30个优良无性系，遗传增益达22%~28%，为造林区划提供了科学依据。

By quantitative analysis of partial correlation coefficients of the regression models, the key silvicultural techniques of growing Masson pine plantation can be scientifically determined as site control, inheritance control and density control.

通过对回归模型偏相关系数的定量分析，可以确定马尾松人工林培育的关键技术措施是立地控制、遗传控制和密度控制；同时，还可根据各项造林技术措施和林分年龄，预测马尾松林分的生长。

Forestry elements(tree species, standage,afforestation density etc), ecological elements (hillside direction, hillside seat, soil type etc) and meteorological elements (temperature,humidity, precipition etc) were the leading factors by the correlation analysis of qualitative and quantitative factors of epidemiology of spore dispersing and disease state observation.

通过对病菌孢子飞散规律和病情调查的定性因子和定量因子进行相关的分析结果，已明确了林分因子(树种、林龄、造林密度等)、生态因子和气象因子交互作用是樟子松枯梢病流行的主导因素。

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。