【摘 要】
：
辽宁西部地区冬季极少降雪,春季多风干旱、少雨,土壤含水量低,一般年份只有7％左右,严重影响了春季造林成活率及保存率。尤其在当前阳坡造林比重相当大的情况下,如何提高阳坡
论文部分内容阅读
辽宁西部地区冬季极少降雪,春季多风干旱、少雨,土壤含水量低,一般年份只有7％左右,严重影响了春季造林成活率及保存率。尤其在当前阳坡造林比重相当大的情况下,如何提高阳坡造林成活率及保存率,加快绿化步伐,是一个急待解决的问题。为此,我们于一九七七、一九七八两年在油松阳坡植苗、播种造林上施用了增温保墒剂,对提高阳坡造林成活率及保存率方面取得了一定的效果。本文从增温保墒剂的增
In the western part of Liaoning Province, there is very little snowfall in winter and windy and dry in spring with less rainfall and low soil water content, only about 7% in normal years, seriously affecting the survival rate and preservation rate of afforestation in spring. Especially in the current situation where the proportion of afforestation in the sunny slope is quite large, how to improve the afforestation survival rate and preservation rate on the sunny slope and accelerate the pace of afforestation is an urgent problem to be solved. To this end, we applied warm-keeping and moisture-preserving agents to oilseed slope cultivation and planting in 1974 in 1978 and 1978, and achieved some results in improving the survival rate and preservation rate of afforestation on sunny slopes. This article from the increase of warming moisture agent
其他文献
大兴安岭林区地处祖国北部边陲,是我国重要的木材生产基地之一。随着森林资源的不断开发利用,人工更新造林已成为恢复和发展森林资源的重要手段。大兴安岭林区属于寒温带湿
The total vehicle sales in 2006 were 7 million units, making China the world second largest market after the US. The top 10 vehicle makers had achieved nearly 8
The complex workpiece-fixture behaviour during machining is an essential component of the fixture development process.In detail,the forces acting on fixture com
小学阶段是学习英语的关键期。小学毕业班的英语总复习,则是对于关键期英语学习总结的最佳时期。因此,研究者提出应当加强对学生学习的科学性指导。在总复习中注重对小学生学
“The first three months of any new job are an extension of the interview process,”says Amanda Augustine,career expert at The Ladders,an online job-matching se
在京郊怀柔区杨宋镇,对外开放近两年的老爷车博物馆,陈列着100多辆国内外老爷车,各式各样、千姿百态的老爷车带着浓厚的历史印记,在3500多平方米的展馆内,静候来客。“这辆吉
A highly active Cu/Zn/Al/Zr fibrous catalyst was developed for methanol synthesis from CO2 hydrogenation.Various factors that affect the activity of the catalys
林旭诚,2006年9月至于2009年7月就读于广州番禺职业技术学院计算机嵌入式应用专业。在校期间,他努力学习专业知识并积极协助教师进行科研工作,锻炼了扎实的专业技能,培养了创
推进创造教育,教师要创造性地教,学生要创造性地学。但在教师的教和学生的学这一关系中,要使学生能创造性地学,很大程度上取决于教师创造性地教。而教师教学的创造性,在某种
小学英语的教学中有部分学生内心存在着对于课堂的厌学情绪,这种状况是很有必要做出改善的。本文将借助实例分析,具体谈谈英语教学中消除学生厌学情绪的对策。一、提升学生对