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森林
相关语句
  forest
    Forest,Soil and Water
    森林、土壤和水
短句来源
    Forest in Mountainous Ecosystem and Its Relationship With Production
    森林与山区生态系统及其生产的关系
短句来源
    DEMAND-SUPPLY FORECAST OF FOREST ENERGY IN HUNAN BY THE YEAR 2000
    湖南省2000年森林能源需求预测
短句来源
    STUDIES ON NOISE TREATMENT OF FOREST DYNAMICAL MODEL AND THE DYNAMICAL PREDICTION OF FOREST RESOURCE
    森林资源动态模型噪声处理与预测
短句来源
    Forest Resource Models Simulation Research.
    森林资源模型仿真研究
短句来源
更多       
  forests
    Burkina Faso Moves to Save Its Forests
    Burkina Faso的拯救森林措施
短句来源
    Recent Changes in Chemical Climate and Related Effects on Forests in North America and Europe
    化学气候变化对北美和欧洲森林的影响
短句来源
    Effect of human activities on atmospheric CO_2 concentration in subtropical forests and carbohydrate content of two species of woody plants.
    人类活动对亚热带森林大气CO_2浓度及两种木本植物碳水化合物含量的影响
短句来源
    The Impact of Air Pollution on the European Forests
    大气污染对欧洲森林的影响
短句来源
    The impact of tourism and environmental pollution on plants and soil of forests in urban parks of Guangzhou
    旅游和环境污染对广州城市公园森林植物和土壤的影响
短句来源
更多       
  forestry
    Forestry Classified Management and Ecological Environment Construction in Qinghe County
    青河县森林分类经营与生态环境建设
短句来源
    Opinion of establishing a forestry eco-efficient compensation system
    试谈建立森林生态效益补偿制度
短句来源
    The Mechanism of Forestry Adjusting and Controlling Agricultural Eco-environment:A Review
    森林植被对农业生态环境的调控机理评述
短句来源
    Research Progress in the Plant Heavy Metal (Cu、Zn、Cd) Pollution of Forestry Ecological System
    森林生态系统植物重金属(Cu、Zn、Cd)污染研究进展
短句来源
    Evaluation of water environment in Zhangjiajie National Forestry Park
    张家界国家森林公园水环境评价
短句来源
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  “森林”译为未确定词的双语例句
    Application of the synthetical evaluating model in forest-site quality synthetical evaluation.
    综合评价模型在森林立地质量综合性评价中的应用
短句来源
    Comparison and Analysis of SO_2 Pollution and Sulplur Content of Trees Between Shenyang East Tomb Park and Aerolite Hill Park
    沈阳东陵公园与陨石山森林公园SO_2污染及树木含硫量的比较分析
短句来源
    A summary of studies on realtionship between ForestDegradation and Air Pollution
    关于森林衰退与大气污染关系的研究概述
短句来源
    Sustainability of Amomum Villosom Ecosystem.
    热带森林-砂仁生态系统可持续性的环境经济学分析
短句来源
    Study on ecological environment problems and countermeasures in western regions --Take planning of Dongshan Park in Huan County,Gansu Province as an example
    西部城镇生态环境问题及对策探讨——以甘肃环县东山森林公园规划为例
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  forest
Moreover, a backward reasoning forest of a reachable marking was generated for explicitly representing reachable paths in RBS.
      
Growth Model System for National Continuous Forest Inventory
      
A Growth Model System is developed for data updating and forecasting of the national continuous forest inventory.
      
Its design is based on the inherent forest growth laws, and its parameters are estimated by modern regression methods.
      
It is suitable for forest resource information updating and forecasting for a large region, e.g., a province.
      
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  forests
The ecological water requirement of forests is defined as the water resources used to maintain and improve the natural balance of forest ecosystems, which can be expressed by evapotranspiration of trees during the growing season.
      
With geographic information system (GIS), the ecological water requirement for forests in the Jinghe watershed, western China was estimated.
      
The results revealed that the minimum and suitable ecological water requirements of the forests in the Jinghe watershed were approximately 204×107 and 340×107 m3, respectively.
      
Although the RENIs of plantations in rehabilitated fields are a little lower than those of natural forests, they are higher than those of cultivated crops.
      
Comparative Analysis of Plant Diversity of Pinus tabulaeformis Forests in Ten Regions of Beijing Mountainous Areas
      
更多          
  forestry
According to the international methods of pest risk analysis and urban forestry characteristics in Beijing, a quantitative risk assessment system in Beijing for three primary non-indigenous pests was proposed.
      
Eco-emigration and the return of marginal agricultural land to forestry can be practiced.
      
This study was conducted at Maoershan Forest Research Station (45°21'-45°25'N, 127°30'-127°34'E) owned by Northeast Forestry University in Harbin, northeast China.
      
The Maoershan forestry centre is situated in the Zhangguangcai Mountain of the Changbai mountain range.
      
Following the principles of runoff-collecting forestry and applying the forest structure investigation results, the authors developed a formula to calculate appropriate density for forests on the basis of different diameters at breast height (DBH).
      
更多          


Based on the data studied for many years by our group and then published, research information on selenium in the environment and living beings in the world, geographic belts of selenium distribution in vegetation, animals and human bodies in all over the world is analysed in this paper. It is suggested that there is a low-selenium zone which takes the humic and semi-humic forest, forest-grassland in the temperate zone and the mediterranean type regions in the middle and high latitudes of the southern and northern...

Based on the data studied for many years by our group and then published, research information on selenium in the environment and living beings in the world, geographic belts of selenium distribution in vegetation, animals and human bodies in all over the world is analysed in this paper. It is suggested that there is a low-selenium zone which takes the humic and semi-humic forest, forest-grassland in the temperate zone and the mediterranean type regions in the middle and high latitudes of the southern and northern hemisphere as the center, where selenium response symptoms in man and animal occur, caused by the low-selenium ecological chain in the primary geographic environment. From the view point of the relation between the primary and secondary environment, it is proposed that regional distribution of selenium in the environment is of significance in both environment study and evaluation.

本文根据作者所在研究组多年研究发表的数据、综合世界上有关环境和生物中硒的研究资料,分析了植物、动物和人体组织中硒在世界上基本一致的带状地理分布特征。提出世界上有一低硒带,这一低硒带以地球上南北半球中高纬度温带湿润、半湿润森林森林草原带和地中海型自然地区为中心。并以原生地理环境低硒生态链所引起的人和动物硒反应症的分布为特征。从原生环境和次生环境关系的角度提出环境中硒的区域分异在环境研究和评价中的意义。

In observance with requirements for specimens sampling, over 200 samples in 72 soils profiles of Second Songhua River Basin were collected. Certain elements of Cd, Cr, Cu, Fe, Hg, Mg, Mn, Ni, Pb, Se, Sr, and Zn were determined with atomic adsorption spectrophotometry, anodic stripping voltammetry and fluorescence spectrophotometry. Background values of these elements in dark brown forest soil, Baijiang soil, black soil, dark meadow soil and paddy soil in this basin were obtained.

按照背景值的采样要求,采集了第二松花江流域(除长白山外)72个土壤剖面的200多个样品。用原子吸收法、阳极溶出伏安法和荧光光度法等测定了镉、铬、铜、铁、汞、锰、镍、铅、硒、锶、锌等元素的含量,得出全流域及流域内不同地区暗棕色森林土、白浆土、黑土、暗色草甸土、水稻土的元素背景值。 本文探讨了土壤类型、成土母质和土壤利用状况对背景值的影响,指出土壤背景值的地域差异性。地理单元划分越细,其土壤背景值的实用性越强。

The changes in the ecological environment caused by human activities in Xinjiang are mainly as follows:1. The flowing distances of rivers have been shortening, and the mineralization and silt content of their water have been increasing.2. The water level of lakes has been descending, or they have been drying up, their water mineralization has been rising.3. Forests have been being damaged, the area has been reducing.4. Pastures have been retrograding, the herbage yield has been dropping, and the quality deteriorating.5....

The changes in the ecological environment caused by human activities in Xinjiang are mainly as follows:1. The flowing distances of rivers have been shortening, and the mineralization and silt content of their water have been increasing.2. The water level of lakes has been descending, or they have been drying up, their water mineralization has been rising.3. Forests have been being damaged, the area has been reducing.4. Pastures have been retrograding, the herbage yield has been dropping, and the quality deteriorating.5. Soils have been suffering from the secondary salinization, swamping and their fertility has been lowering.6. The area of desertification has been expanding continuously.In order to protect and improve the ecological environment, the water and soil resources to a better use must be put, the natural vegetative cover should be protected and expanded, the desertification, salinization and swamping should be prevented, and the relationship between human beings and nature be coordinated.

人类活动引起的新疆生态环境变化主要有以下几方面:1.河流流程缩短,河水矿化度和泥沙含量增加;2.湖泊水位下降,湖面缩小或变干,湖水矿化度升高;3.森林破坏,面积缩小;4.草场的产草量降低,牧草质量下降; 5.土壤次生盐渍化、沼泽化和肥力下降;6.土地沙漠化不断扩大。

 
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