农学 >>> 农学总论 作物学 园艺学 土壤学 植物保护学 农药学 林学 畜牧学 兽医学 水产学
搜索结果: 1-15 共查到农学 Pinus sylvestris L.相关记录15条 . 查询时间(0.078 秒)
The roles of different tree species and their impacts are key in assessing the dynamics of soil restoration in afforested post-mining sites. The objective of this study was to compare the effect of Sc...
人工固沙植被是干旱、半干旱区荒漠化防治的重要内容,研究人工固沙植被演变过程中物种多样性和土壤水分变化特征对于人工固沙植被的经营与管理有重要意义。对科尔沁沙地营造的5~45 a的樟子松(Pinus sylvestris)人工固沙植被林下植被的物种多样性和土壤水分变化特征进行了研究。结果表明:在樟子松固沙林演变过程中,群落中禾本科和菊科植物种始终占主导地位,且随着樟子松栽植年限的增加,禾本科植物所占比...
Foresters frequently lack sufficient information about thinning intensity effects to optimize semi-natural forest management and their effects and interaction with climate are still poorly understood....
We studied effects of repeated nitrogen applications on the stem growth of mature Scots pine at four sites with the yield potential of around 3‒4.5 m3·ha–1·yr–1. Treatments included control (0...
As the tree age increases, the formation of heartwood takes place in the central part of the tree. Since there is a large difference in the moisture content between sapwood and heartwood in conifers, ...
Genetic structure, diversity and clonal homogeneity were determined on the basis of the isozyme gene markers in a model Scots pine seed orchard in the north-eastern part of the Czech Republic that ori...
Pine stands at fertile sites need conversion into broadleaved or mixed forests. Yet, according to the age of stand, conversion may have different economic results. Therefore, in order to reduce costs ...
Studies were carried out in southern Poland during 2002–2006 in Scots pine stands under the effect of an outbreak of pine shoot beetles. The qualitative aspects of beetle feeding in tree crowns, studi...
In this article the stem shape is compared in three coniferous tree species: Norway spruce, Scots pine and European larch. Stem is investigated by means of geometrical methods. Simplified Bookstein ...
We studied effects of repeated applications of nitrogen on stem growth of mature Scots pine at four sites with yield potential around 3 - 4.5 m3 ha‑1 yr‑1. Treatments included control (0) ...
This is a study on the evaluation of stem shape in Scots pine. The experiments were carried out on 430 stems without bark, taken from 30 fully analysed sample trees that grew in 5 different locations ...
Needle retention (number of needle sets) and needle density (number of needle pairs per centimeter of shoot) were surveyed on Scots pines in five forest regions of Slovakia. The Needle Trace Method (N...
In this study the proportion of lignin in wood tissue was analysed in 36 Scots pines differing in their form of dead bark. Material for analyses came from pure pine stands aged 89-91 years located in...
This study was performed to determine the effects of exposure to outdoor condition and of the bleaching process after exposure outdoor conditions after the bleaching process on hardness, both parallel...
The aim of the present study was to determine the effects of the litter chemistry of spruce (Picea orientalis), pine (Pinus sylvestris) and chestnut (Castanea sativa) grown in the Artvin region on th...

中国研究生教育排行榜-

正在加载...

中国学术期刊排行榜-

正在加载...

世界大学科研机构排行榜-

正在加载...

中国大学排行榜-

正在加载...

人 物-

正在加载...

课 件-

正在加载...

视听资料-

正在加载...

研招资料 -

正在加载...

知识要闻-

正在加载...

国际动态-

正在加载...

会议中心-

正在加载...

学术指南-

正在加载...

学术站点-

正在加载...