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退化评价
相关语句
  degradation evaluation
     Remote Sensing and Land Degradation Evaluation
     遥感技术与土地退化评价
短句来源
     Soil Degradation Evaluation in The Three-Gorge Reservoir Area ——A case study from Zigui County
     三峡地区土壤生态退化评价——以秭归县为例
短句来源
  degradation assessment
     Research on Grassland Degradation Assessment Model based on ETM+Image——A Case Study in Naqu County of Tibet
     基于ETM+影像的草地退化评价模型研究——以西藏自治区那曲县为例
短句来源
     A Model of Grassland Degradation Assessment Based on NDVI---Taking the Grassland in Tibet as an Example
     基于NDVI的西藏自治区草地退化评价模型
短句来源
     Finally, a model of grassland degradation assessment is built based on NDVI and grassland degradation index, which provides a new method for grassland degradation assessment with remote sensing.
     最后根据NDVI与草地综合评价指数建立草地退化评价模型,为草地退化的遥感宏观评价提供了一种新方法。
短句来源
     Land degradation was defined, the advances of land degradation was introduced from four aspects, which consists of the driving factors, classification, countermeasures, assessing theories and methods of land degradation, and based on the three theories and two methods of land degradation assessment, the general direction of research on land degradation science was indicated.
     定义了土地退化的概念 ,并从土地退化的驱动因素、分类、防治及其评价理论和方法四个方面介绍了土地退化的研究进展 ,并以土地退化评价的三种理论和两种方法为基础 ,提出了土地退化的研究方向。
短句来源
     Remote Sensing Information Extraction of Soil Factors in Land Degradation Assessment
     土地退化评价中土壤因子的遥感信息提取研究
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  “退化评价”译为未确定词的双语例句
     The evaluation of degradation of farmland eco-system of Poyang Lake zone based on extension engineering method
     基于可拓工程方法的鄱阳湖区农地生态退化评价
短句来源
     Study on Evaluation Index System of Red Soil Degradation
     侵蚀红壤肥力退化评价指标体系研究
短句来源
     ASSESSMENT OF GLOBAL SOIL DEGRADATION
     全球土壤退化评价
短句来源
     Evaluation on Soil Degradation in Typical Region of Upper Reaches of Yangtse River
     长江上游典型地区的土壤退化评价
短句来源
     Indexes and standards for evaluating soil degradation were set up,and the degree, type and spatial change of soil degradation were evaluated in Zigui County.
     建立了土壤退化评价指标及其评价标准,并对三峡库区秭归县的土壤退化强度、类型与空间变化进行了评价与分析。
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  degradation evaluation
Toughness degradation evaluation of 1Cr-1Mo-0.25V steel by electrical resistivity
      
Degradation evaluation in aged 1Cr-1Mo-0.25V steel using magnetic permeability
      
  degradation assessment
Land degradation assessment based on environmental geoindicators in the Fortaleza metropolitan region, state of Ceará, Brazil
      
This paper summarizes the results obtained by land degradation assessment in the Fortaleza Metropolitan Region, in the state of Ceará, Brazil.
      
In Vitro Ruminal Degradation Assessment A series of experiments were carried out to select the most promising enzyme candidates.
      
Satellite images have a considerable value for mapping forest fire and degradation assessment.
      
This is the latest standard reference on scientific and experimental approaches to soil degradation assessment.
      
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Based on the criteria for assessment of land degradation two synthetic maps of land degradation in different periods (1950's and 1980's) are prepared by using aerial photos and with the help of GIS. It has been shown that due to the long history of economic development more than 64% of land were cultivated or used in the studied area. Various grades of degraded land caused by water erosion occupied only 36% of the total land: some 5. 11% of this are severely and very severely degraded, 7. 38% moderately and...

Based on the criteria for assessment of land degradation two synthetic maps of land degradation in different periods (1950's and 1980's) are prepared by using aerial photos and with the help of GIS. It has been shown that due to the long history of economic development more than 64% of land were cultivated or used in the studied area. Various grades of degraded land caused by water erosion occupied only 36% of the total land: some 5. 11% of this are severely and very severely degraded, 7. 38% moderately and more severely degraded and the other 23. 43% slightly degraded and non-degraded. Since downslope zonation of soil, vegetation and erosional features is obvious from top to foot of hill, same situation happens to spatial variation of degraded land. It has been proved that severely and very severely degraded land characteristic of bared badlands were not formed in recent decades due to deforestation as it was commonly thought, but its history could been traced back to at least Ming and Qing Dynasties (350-650 years B. P.), even Tang, Song, Yuan and Jin Dynasties (650-1300 years B. P). During the last few decades the development of land degradation manifests itself as drastic reduction. of non-degraded land and parallel increase of slightly and moderately degraded land.

在土地退化评价指标建立的基础上,利用两期航空象片和GIS,编制完成了浙江省兰溪市上华试验区50年代和80年代土地退化图。分析表明,全区64%以上土地已开垦利用,流水侵蚀引起的各级退化土地面积约占全区土地总面积的36%。其中,剧烈和严重退化土地约占5.11%,较严重和中度退化土地约占7.38%,轻度和微度退化土地约占23.43%。退化土地的空间分布具有明显的坡位分异性。目前本区以裸露的侵蚀劣地为主要特征的严重和剧烈退化土地,并非人们以往所认为的是近几十年间形成的。近几十年来,土地退化的发展主要表现为微度退化土地的急剧减少及轻度和中度退化土地的明显增加。

Land degradation caused by water erosion in South China took place mainly due to the vulnerabilities of its ecological environment, such as thin layer of top soil, poor nutrition and moisture and low erodibility of subsoil as well as a marked summer drought. Depletion of vegetation cover induced by adverse human activities provides a breakthrough point for its initiation, and abundant rainfall and frequent rainstorms and typhoons in summer act as the exogenous agent for its development. Land degradation in South...

Land degradation caused by water erosion in South China took place mainly due to the vulnerabilities of its ecological environment, such as thin layer of top soil, poor nutrition and moisture and low erodibility of subsoil as well as a marked summer drought. Depletion of vegetation cover induced by adverse human activities provides a breakthrough point for its initiation, and abundant rainfall and frequent rainstorms and typhoons in summer act as the exogenous agent for its development. Land degradation in South China manifests itself as not only soil degradation but also vegetation degradation and deterioration of land surface. Its development could be considered as a multiple vicious circle of the process: vegetation degradation soil degradation deterioration of land surface. Tentative criteria for land degradation assessment were set up, including vegetation types and cover, types and percentage of surface materials exposed as well as erosional morphology and its percentage.

中国东部亚热带地区流水侵蚀所引起土地退化的形成,是由其生态环境自身的脆弱性决定的。土地退化不仅表现为土壤退化,还表现为植被退化和土地状况恶化,其发展过程是植被退化-土壤退化-地表状况恶化过程多重循环的结果。据此,提出了中国东部亚热带丘陵山地土地退化评价指标

The biological characteristics in degradation and remediation of red soil as well as its relationships with eco environmental conditions were discussed by using niche concept. With biological cycles as the focal point, the development feature of red soil niche was analysed, and the rules and descriptive methods for degradation and restoration of red soil ecosystems were investigated to establish the methods and indicators for evaluating the degradation of red soils.

应用生态位概念研究红壤退化和改良过程中的生物学特征及其与生态环境条件的关系,把红壤的生物学循环作为重点,分析红壤生态位的演化特点,探索红壤生态系统退化和重建的若干规律和描述方法,以求建立有关红壤退化评价的方法和指标体系

 
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