Exotic insect pests can produce both short-and long-term effects on forest ecosystems.
外来害虫可以对森林生态系统产生短期和长期的影响。
Long-term effects are primarily mediated by changes in tree species composition and the consequent alterations of forest structure, productivity, and nutrient uptake.
长期影响主要是由树种组成的变化以及随之而来的森林结构、生产力和养分吸收的变化所导致的。
It was the second such drought in the Amazon in five years, and forest scientists are trying to understand why these droughts are happening, and what their effects will be for the planet.
这已经是五年来的第二场干旱了，而科学家们正在研究并试图弄清楚这些干旱为什么会发生，而它们又会对我们的星球产生怎样的影响。
Globally there is limited quantifiable data about pest incidence and their effects on forests and forest products.
在全球范围内，有关病虫害发生率及其对森林和森林产品造成影响的可量化数据有限。
He monitors birds in Costa Rica's forest fragments and agricultural areas to document the effects of habitat loss and land use.
他监测了哥斯达黎加森林带和农垦区的鸟类，以记录下栖息地流失和土地使用对鸟类灭绝所产生的影响。
The effects of forest types on hydrochemical characteristics of streams in Liangshui National Nature Reserve were studied by the comparison experiment of watersheds.
采用集水区对比分析方法，探讨凉水国家级自然保护区不同森林类型对溪流水化学特征的影响。
The effects of skidding road on forest landscape ecology increase as the density of skidding road increases.
随集运材道路网密度的增大，其影响也增大。
Quantitative researches on the effects of mountain forest road network on the environment in forest land were ignored in past.
山地林道网对林地环境影响的定量研究是一个重要的却一直未被重视的领域。
Line of sight and Area Effects: This rule (on page 23) has been revised to deal with the new fog and forest terrain, which blocks line of sight but not line of effect.
视线和地区影响︰这个规章(在第23页上)已经被修正处理新雾和森林地形，块视线但不是影响的行。
Therefore, we evaluated the effects of forest loss and landscape composition on the reproductive life-history parameters.
因此，我们估计了森林丧失和景观组成对它们繁殖生活史参数的影响。
The effects of thinning on forest growth embodied some aspects which mostly include the effects on stand productivity, stand factors, stand biomass, vegetation and shrubs under-forest, soil and so on.
抚育间伐对森林生长的影响体现在很多方面，包括对林分生产力及其林分因子、林下植被及灌木、林下土壤和天然更新影响等方面。
Species composition, quantitative dynamics and effects of gap age and gap size on species compositions were studied in the tropical montane rain forest of Bawangling Natural Reserve, Hainan Island.
分析了海南岛霸王岭自然保护区热带山地雨林林隙内树种的种类组成、数量动态以及林隙年龄和林隙面积对树种组成及数量的影响。
Forest fragmentation has immeasurable effects on birds. The population dynamics, population genetics and local evolution of birds are to some extent affected by the changes of environment.
森林生境片断化对生活在其中的鸟类产生着难以估量的影响，鸟类的种群动态、种群遗传和局部进化等都不同程度地受环境变化的影响。
The effects of forest fires on soil separate coefficients, porosity, saturated water-retaining capacity, available Mg, fine root significantly varied between the fire intensity.
火烧强度对上壤分散系数、孔隙度、饱和持水量、有效镁、细根系生物量的影响有显著差异。
In which the fuel combustion as a major forest conditions, forest fire effects prominent.
其中在可燃物作为森林燃烧的重要条件，对森林火险影响突出。
This paper reviews the research history of acid deposition, and summarizes the effects of acid deposition on forest ecosystems.
回顾了酸沉降的研究历史，总结了酸沉降对森林生态系统的影响。
So the consistency of rhizosphere effects between soil nutrients and soil microbes could be found during some growth periods of forest vegetation in south subtropical region.
在南亚热带森林生态系统中。在植物的某些生长季节，微生物的根际效应与土壤养分的根际效应一致。
The problems existed and developing trends for the future in studies of the effects on forest growth were presented.
指出了抚育间伐对森林生长影响研究方面存在的问题及今后的发展趋势。
Studies of those aspects all over the world were summarized and the model studies actuality of effects on forest growth by thinning were introduced briefly.
对国内外学者在这些方面的研究进行了综述，简单介绍了抚育间伐对森林生长影响的模型研究进展情况。
Birds and other wildlife species play key roles in seed dispersal and thus in the natural spread of forest, shrub, and other vegetation and their associated beneficial effects of slowing soil erosion.
鸟类和其他野生生物在分布播种中扮演了关键的角色，因此在自然的森林、灌木丛及其他植被的生长中，以及在相关减缓土壤侵蚀过程中均十分重要。
A staggeringly ambitious plan to mitigate the effects of climate change would see the Sahara and Australia's outback planted with forest – and cost US$2 trillion.
美国研究者提出一项大胆得惊人的计划，即投入2万亿美元，缓解气候变化的影响，让撒哈拉和澳大利亚的荒漠都重新披上绿装。
Soil and water conservation function of forest vegetation hasbeen explained through analytical effects of vegetation different layers on rainfall effect.
分析了森林植被不同层次对降水影响所引起的径流量、径流能量和径流的挟沙能力及其减小的效应。
DID model was used to analyze net effects of CFTRC on the changes in forest areas and forest volume;
DID模型用于分析集体林改对森林面积和森林蓄积量变化的净影响；
The effects of the sandbreak forest system in Yulin sandy area on the sandbreak, soil improvement and natural vegetation recovery were studied by investigating their configuring structure and species.
通过对陕北榆林风沙区防风固沙林体系的配置结构、树种组成、防风固沙效益、改良土壤的作用以及对天然植被的影响等的调查、观测和分析，结果表明：其配置结构较为合理，生态效益较为显著。
Since 1976, we have determined the purification effects of air pollution by three structures, namely, forest-belt, hedgerow and scattered tree planted in Shaoxing Iron and Steel Factory.
自1976年以来，我们对绍兴钢铁厂设置的林带、绿篱、散生树三种结构的空气净化效应进行了测定研究。
The results show that : 1 ) the vegetation recovering effects depends on the distance of Populus forest belts. The rational distance will significantly improve vegetation recovery effect ;
结果表明：1）林带间距的宽窄影响植被恢复的效果，适宜带间距离的林带具有明显的加快和促进植被修复的作用；
Forest litter has considerable eco-hydrological effects in retarding surface runoff, trapping sediment, and equilibrating soil water and heat status.
森林凋落物具有阻滞径流、拦截泥沙和均衡土壤水热状况等功效。
Forest litter has considerable eco-hydrological effects in retarding surface runoff, trapping sediment, and equilibrating soil water and heat status.
森林凋落物具有阻滞径流、拦截泥沙和均衡土壤水热状况等功效。
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