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。
Finally, the conference established the framework for a European research network on forest ecosystems.
最后，会议为欧洲森林生态系统研究网建立了框架。
The first is climate change, which is expected to redraw the map of forest ecosystems.
第一是气候变化，人们预计这会重塑森林生态系统的版图。
Temperate forest ecosystems occupy a position of prominence among all ecosystems.
温带森林生态系统在所有生态系统中占有优势地位。
The common work procedure of rehabilitating degraded forest ecosystems was briefly introduced.
简述了退化森林生态系统恢复和重建的一般操作程序；
Its principal area of research covers the broad spectrum of forest ecosystems in the western Carpathians.
该所的主要研究领域包括喀尔巴阡山脉西部森林生态系统的广泛范围。
In chapter 2, the theories of degradation and restoration and rehabilitation of forest ecosystems were discussed.
第二章探讨了森林生态系统的退化及其恢复和重建的理论基础。
Forests are not only trees, and forest ecosystems are more fragile, longer-lived and less closely controlled than crop fields.
森林不仅仅是树木，森林的生态系统更加脆弱，寿命更长，与农田相比更松散的管理模式。
Nitrogen transformation and cycling in forest soils are of signification importance to the function of forest ecosystems.
森林土壤氮素转化与循环在森林生态系统功能中占有极其重要的意义。
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。
Aims Quantifying forest soil respiration (RS) components is vital to accurately evaluate carbon sequestration of forest ecosystems.
量化森林土壤呼吸(RS)及其组分对准确地评估森林土壤碳吸存极其重要。
The increased deposition of atmospheric nitrogen due to the air pollution has exceeded the demands of forest ecosystems in many areas.
因大气污染而不断增加的大气氮沉降量，在许多地区超过了森林生态系统的氮需求。
Interpretation of the area's hydrology is articulated through the rehabilitation and creation of wetland, prairie, and forest ecosystems.
通过恢复和创造湿地，草原和森林生态系统来解读该地区的水文结构。
As the primary producer of forest ecosystems the forest productivity reflects the structure and function of plant community synthetically.
森林生产力是森林生态系统中作为第一性生产者植物群落结构与功能的综合体现。
Forest litter was main component of forest ecosystems, it was very important for the forest ecosystems to remain its structure and function.
森林凋落物作为森林生态系统的重要组成部分，对维系森林生态系统的结构和功能具有非常重要的作用。
The results show that the two models can be used as a basic tool of investigating land-atmosphere interactions at the two typical forest ecosystems.
研究结果表明，这两个陆面过程模式可以作为研究这两种典型森林生态系统陆气交换的基本工具。
To restore and rehabilitate the degraded forest ecosystems, we must understand the theories concerned, also we have to study and apply the related technology.
退化森林生态系统的恢复和重建依赖于对有关理论的理解和认识，也依赖于对有关技术体系的研究和应用。
In March 1999, the Central African country held its first session in Yaounde to protect forest ecosystems in the region Summit adopted the "Yaounde Declaration."
1999年3月，中部非洲国家在雅温得召开第一届保护该地区森林生态系统首脑会议，通过了《雅温得宣言》。
This book provides a review, written by expert world forest scientists, of what is known about the impact of elevated CO2 and other greenhouse gases, on forest ecosystems.
这本书提供一篇回顾，以专家世界森林科学家写，在森林生态系统上知道有关举起CO2和其他温室气体的影响的情况什么。
Ectomycorrhizal ( EcM) fungi form mutualistic symbioses with many tree species and are regarded as key organisms involved in nutrient and carbon cycling in forest ecosystems .
外生菌根真菌与很多植物形成互利共生关系，在营养物质交换和碳循环等方面起着关键性的作用，是森林生态系统的重要组成部分。
Forest litters decomposition was an important process of nutrient cycling in forest ecosystems, and played a central role in soil organic matter formation and nutrients release.
凋落物分解是森林生态系统养分循环中的重要过程，对土壤有机质的形成和养分释放有重要意义。
Forest ecosystems are being destroyed by logging, burning for subsistence farms, and poaching. The 20 species of lemurs for which Madagascar is renowned are in danger of disappearing.
由于过度伐木、自给农业的焚烧土地和捕猎，森林生态系统遭到了严重的破坏。20种马达加斯加特有的狐猴将会消失。
Radiative transfer plays a key role in forest ecosystems. Solar radiation provides energy for photosynthesis, appropriate ambient temperature and development information for plants.
辐射传输研究是贯穿森林生态系统的纽带，太阳辐射为植物的生长发育提供光合能量、适宜的环境温度以及发育信息。
Criteria define the essential elements against which sustainability is assessed, with due consideration paid to the productive, protective and social roles of forests and forest ecosystems.
标准界定了评估可持续性的基本要素，同时适当考虑森林及森林生态系统的生产、保护及社会职能。
The study examined the total contents of soil organic carbon and the content of soil active organic carbon and stable organic carbon in farmland, grassland, scrub and forest ecosystems.
本研究分析了子午岭林区农田、草地、灌丛和森林不同生态系统土壤总有机碳、活性有机碳和稳定性有机碳含量。
It is important to study the soil spatial variability of N_2O, CO_2 production and the influencing factors for evaluating the role of forest ecosystems on the impact of the greenhouse effect.
研究森林土壤N_2O、CO_2产生的空间变异性及影响因子对准确估算森林生态系统对温室效应的影响具有重要意义。
While China is a country with poor forestry resources, the whole function of forest ecosystems are very fragile, and the contradiction between the needs of society becomes increasingly intense.
而我国木材短缺，森林资源总量严重不足，森林生态系统的整体功能非常脆弱，与社会需求之间的矛盾日益尖锐。
Insects and pathogens are integral components of forest ecosystems and normally are present at a relatively low density, causing little damage, and having negligible impact on tree growth and vigour.
昆虫和病原体是森林生态系统的固有成分，通常其密度相对较低，所造成的损害较小，对树木生长及其活力的影响微乎其微。
Ecosystems exposed to more than one pressure, such as a forest that is first felled and then used for agriculture, took the longest to recover.
那些遭遇不只一种压力的生态系统，例如一片先是被砍伐再被用作农耕的林地，需要最长的时间来复原。
Ecosystems exposed to more than one pressure, such as a forest that is first felled and then used for agriculture, took the longest to recover.
那些遭遇不只一种压力的生态系统，例如一片先是被砍伐再被用作农耕的林地，需要最长的时间来复原。
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