森林植被

The researches cover silviculture, vegetation management, tree physiology, ecophysiology, dendrochronology, forest ecology, forest fire ecology, forest soil biology, biotechnology, forest genetics, forest entomology and pathology, forest practices effects on biodiversity and sustainability and forest economics etc.

该杂志研究领域涉及造林学、植被管理、树木生理学、生态生理学、树木年代学、森林生态学、森林大火生态学、森林土壤生物学、生物技术、森林遗传学、森林昆虫学与病理学、森林实践对生物多样性与稳定性的影响以及森立经济学等。

An understory of shorter trees and a lacework of woody vines, or lianas, produce a forest of such complex internal architecture that many animals, including some sizable ones, rarely or never descend to the ground.

下层植被和藤蔓植物形成了具有相当复杂的内部体系的森林。生长在冠层和新生树木层的树较少。由于阳光穿透冠层使下层植被和森林地表植被生长得更好。

At the same time, the case of soil and water loss will be intensified,and the level of salination at western plain region in northeast will be enhanced.

森林植被一旦破坏，很容易荒漠化，造成生态功能衰退，影响与其相邻的草原地带草地沙化面积扩大，盐碱化程度进一步增强。

In conclusion, the root causes of forest degradation in Aofengshan is the uncompatible land use type that causing fire. In general the natural restoration potential is pretty well, but the richness and abundance of seed bank are unsatisfactory.

鳌峰山地区森林植被退化的主因，乃为土地利用方式不当而造成火烧干扰，整体而言，鳌峰山地区自然生态复原能力良好，但仍有种子库丰富度不足及缺乏多样性的。

The distribution of the sphinxes ranges from 1-4 forest types and the population density for the species of wide range of ecological distribution is also high.

各种天蛾分布范围，有1至4个森林植被类型不等，凡生态分布宽的种类，其种群虫口数量亦大。

The research results show that grass vegetation,like forest and bush,can effectively control soil erosion.

结果表明，草被与森林植被一样，能有效防止土壤侵蚀。

From 6860 to 3170 cal.yr BP,semi-desert steppeexpanded,regional montane forest steppe retreated,suggesting a prolonged warm and dryclimate.Between 3170 and 2340 cal.yr BP,regional forest steppe expanded whereassemi-desert steppe retreated,indicating the climate became cool and wet gradually and thehumidity reached the maximum at the end of this stage.During 2340～1600 cal.yr BP,Poaceae steppe dominated whereas wetland meadow expanded and the montane forest stepperetreated,suggesting a cool and wet climate prevailed,wormwood grass steppe prevailed andthe climatic instability increased after 1600 cal.a BEThe climate and environmental reconstructions by pollen were supported by the diatomrecords.A relative high lake level and moister climate prevailed between 8660 and 7230 cal.yr BP as inferred by the dominance of planktonic diatom genera and high planktonic/benthicratio (〉40).low lake level and dry climate sustained during 7230～2330 cal.yr BP assuggested by the low abundance of planktonic diatom and low planktonic/benthic ratio ～20and the lake returned to high level during 2330～930 cal.yr BP as inferred by there-dominance of the planktonic diatom and the high value of palnktonic/benthic ratio.The pollen-based climate reconstruction was also consolidated by the grain size andPediastrum concentration records.

Ugii Nuur湖周围现代孢粉研究表明：松属为空气传播的外来花粉，其含量变化可能指示了远山森林草原发育状况；禾本科具显著低代表性，母体植物建群时含量通常在10％以下：藜科花粉含量可以指示区域气候干旱程度。2、以现代孢粉研究为基础、可靠AMS~(14)C年代为框架，Ugii Nuur孢粉记录高分辨率地重建了蒙古国中部地区过去8660 cal.yr BP以来的植被和气候变化。8660～7800 cal.yr BP研究区植被为禾草草原，湖畔及河谷低地发育苔草草甸，远山发育松属针叶林和森林草原，气候温和略湿润；其中8350～8250 cal.yr BP湿生草甸扩张，旱生植物成分减少，气候凉湿。7800～6860 cal.yr BP旱生成分增加，气候转向暖干。6860～3170 cal.yrBP半荒漠草原扩张，远山森林草原退缩，山地草原和河谷及湖畔湿生草甸退缩，气候持续暖干。3170～2340 cal.yr BP半荒漠草原退缩，远山森林草原扩张，气候转凉变湿，末期湿度条件达最佳。2340～1600 cal.yr BP禾草草原发育，湖畔及河谷低地湿生草甸扩张，远山森林草原略有退缩，气候总体较凉湿。1600 cal.yr BP以来研究区发育禾草-冷蒿草原，气候波动较大。

Suiting for disposing in factory and suburb outer edge belts in terms of protection against wind and preventing sand from drifting, the tree is populous, and the bashes are sand willow and slender branch sweet vetch Among them, sand willow shrub forest in the nearly stratum 10cm layer, can decrease wind speed by 60.3%.

上述野 外试验和盆栽试验都证明上、下覆膜和美国干水处理保墒效果较好、性能稳定，可以在干旱半干旱地区城市森林植被建植过程中大面积推广应用。

In order to explore the effects of different forest types on soil active carbon pool,the content and density of soil organic carbonwere studied in different soil horizons under typical coniferous and broadleaved forests in the mountainous area of Beijing.

为探讨不同森林植被类型对土壤活性有机碳库的影响，以北京山地典型针叶林和阔叶林为对象，对土壤有机碳含量与密度进行研究。

Common agrestic tree is planted have 23 families about, 37 belong to, 78 kinds, in these silvan vegetation, multiplying haunt 78 kinds of rare animals such as chicken of giant panda, golden monkey, takin, lesser panda, Mao Guanlu, horse, belong to national emphasis protection among them one, rare wild animal has 2 class precious 32 kinds.

常见的乡土树种约有23科，37属，78种，在这些森林植被中，生息繁衍着大熊猫、金丝猴、扭角羚、小熊猫、毛冠鹿、马鸡等78种珍稀动物，其中属国家重点保护的一、二级珍稀野生动物有32种。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失