查询词典 shelter-forest

Although forest insects and pathogens cause various detriments,they also make positive contributions to forest succession,material cycling and energy flow,a food source,creating wildlife habitat,etc.,and further,in an ecosystem perspective their contributions are critical to forest biodiversity,soil fertility and long-term forest health and sustainability,so forest managers must consider both the detrimental and beneficial functions of insects and pathogens.

森林昆虫和病原物虽然能引起林木损伤与死亡，但它们在森林演替、物质循环和能量流动、食物来源、创造野生动物生境等方面都作出了积极的贡献，而且在一个生态系统发展前景中，对于森林生物多样性、土壤肥力、森林的长时期健康和稳定性等方面，它们的促成作用也是必不可少的。因此，森林经营者应当考虑昆虫和病原物的害与益的两方面作用。

The concept system on forest carrying capacity is framed, and "forest actual carrying capacity"and"forest maximum carrying capacity" and"forest carrying quantity"and"forest carrying index"are defined in this paper.

3在明确了森林承载力评价的目的，确立了森林承载力评价的原则和时空尺度的基础上，建立了森林承载力评价的概念模型和逻辑框架，为森林承载力的评价提供了基本思路。

By the analysis of the dead leaves and branches and the holding water contents of five type standing forests—birch and larch mixed forest, larch planted forest, Chinese pine planted forest, birch natural forest and shrub forest in Wutai Mountain area, central Asia alpine region, the water conservation benefit among them was compared.

为了探讨不同林分水源涵养功能，为地域林业发展树种规划提供技术依据，该研究以中亚高山区五台山林区内五种不同类型林分为试材，调查分析了不同林分的枯落物及其持水量，比较了不同林分类型的涵养水源效益。

The water conservation benefit of soil for different forests was 277.28%-173.67% higher than that of grass slope, among them, the highest one was birch and larch mixed forest, the followings were larch planted forest, Chinese pine planted forest, birch natural forest, and the lowest one was natural shrub forest.

林地土壤的涵养水源效益比荒草坡高277.28%~173.67%，其中白桦落叶松混交林最高，落叶松人工林、油松人工林、白桦天然林次之，灌木林最低。

In this paper,based mainly on the heights above sea level of the upper limits of the modern dark coniferous forest zones in some mountainous regions and the climatic data obtained from 102 meteorological stations in China,the theoretic altitude of the forest line has been calculated and maps showing the altitude isolines of the forest line,the isolines of height differences between the permafrost limits and the forest line and the isolines of height differences between the modern climatic snowline and the forest line in China have been constructed respectively.

本文主要根据我国一些地区现代暗针叶林带上限的海拔高程和102个气象台站的气象资料，计算出我国的森林线的理论海拔高度，并编绘出我国的森林线高程等值线图以及多年冻土线与森林线高差等值线图和现代气候雪线与森林线高差等值线图。

Firstly, according to study dynamic changes of the elements structures in succession about natural and artificial forest, then summarized regular patterns;at the same time.based on the study of Coupling Relationship between structure and function of water conservation forest established the ideal structures from the stand level and the watershed level. The ideal structures from the stand level: uneven-aged, double layer and mixed structure, and trend to natural forest. The watershed level followed the same principle, that is double layer patches, uneven-aged forest well-distributed and to build up different forest patches in watershed.

首先，经过对北京山区水源林天然林和人工林结构要素的演替动态研究，提出其发展规律，同时依据水源林结构与功能耦合关系研究，从林分层次和流域层次上分别构建了水源林的理想结构，其中，林分层次上水源林的理想结构为：异龄、复层、混交的结构状态，林分结构趋于天然林结构的特征；在流域层次上水源林的理想结构为也应形成&复层&、&异龄&、&混交&的结构，即：在流域各水源林斑块间形成林冠层复层、斑块内部乔木、灌木、草本层的复层；不同水源林年龄面积上的均匀分布；形成不同水源林斑块间的镶嵌分布。

The system implemented forest fire model selection automatically and intelligently. BP artificial neural network model of forest fire model selection was build by treating forest fire environment data as inputting variable and treating appropriate forest fire model as outputting variable. At the same time, we studied the methods of acquiring and calculating data of inputting and outputting. The system implemented machine of model selection automatically based on dynamic data driven technology. We selected 72 items experimental data from historical forest fire records in Beijing to experiment and confirm the validity of model selection. It turned out that the reliability of model selection is more than 80 percent.

3基于BP人工神经网络方法设计了林火模型适宜性选择技术框架结构，通过神经网络形成林火模型选择知识，实现了林火模型的自动化和智能化选择；以火场环境因子为输入变量，以适宜火场环境模拟的林火蔓延模型作为输出变量，构建了林火模型选择神经网络模型；研究了输入、输出因子数据的获取与计算方式，实现了动态数据驱动的林火模型自动选择机制；以本京市为例，选择了有详细火场情况记录的72场林火作为实验样本，其中60条记录作为学习样本集，12条记录作为验证样本，对神经网络进行了学习和验证，实验结果表明，模型选择精度可达到80%以上。

With the socio-economic development, extensive use of modem production technique and the implement of new land contract arid forestry policies, the cropland shelter belt system set up during 1960s-1970s in Manass River Valley, even Xinjiang, needs to be changed in ideas and production techniques and to build new system of shelter forest and adapt to the new rural area construction.

随着社会经济发展、现代生产技术的广泛应用及新的土地承包、林业政策法规的贯彻，玛纳斯河流域绿洲在20世纪60、70年代建立的农田防护林体系，需要在思想观念及生产技术等方面有相应的变化，建立新的防护林体系，适应新农村建设。

The essay analyzes the present forest green GDP calculability system and finds that it has not formed the unified theory and method to the forest resources value calculability,the forest accounting is uncoordinated with the statistical calculability,and its calculability scope is inconsistent with the way,also has not the institution of the forest calculability system and so on.

通过对现行森林绿色GDP核算存在的森林资源价值核算没有形成统一的理论与方法、森林的会计核算与统计核算不协调、核算范围与途径不一致、没有相关的森林核算制度等问题进行分析后认为，必须尽快建立统一的森林绿色GDP 核算体系

In compliance with the objective route of historical development, and based on time and its contents, forest tourism culture in Zhejiang are divided into four periods: formation period, development period, prosperity period, and approaching modern times period; based on its representation of characteristics, it can be divided into origin and transition period, classifying and humanizing landscape and fusing forest period, enjoying and appreciating landscape and the climax of forest period, sight-seeing, exploring landscape and the science of forest period.

本论文应用历史研究的方法，从深入挖掘、系统整理史迹材料着眼，分析研究浙江森林旅游文化的渊源和流变，遵从历史发展的客观线索，按时间和内容将其分为形成期、发展期、繁荣期、走向近代的浙江森林旅游文化等四个时期；按其特征表现分为起源和过度期，归宿、"人化"山水和森林融合期，游览、欣赏山水和森林高潮期，观赏、探索山水和森林科学期等。

In contrast to the ubiquitous rising-sun-with-rays military flag of the Japanese, Chinese banners and ensigns feature a range of designs.

与遍地都是的太阳军旗不同，中国人的旗帜和徽章设计得各式各样。

From their small corner of Feng's Guangzhou headquarters -- a jumble of pink leashes, squeezable rubber steaks, and plastic doggy Santas for Fido's stocking -- Soleil's designers come up with at least five new products a month.

从Feng 设在广州总部的产品展示柜台上可以看到，Soleil的设计师每月至少设计出5件新产品。