查询词典 desertification

The classification results of desertification land and salification land in different years were input into GIS to extract changing information by using spatial analysis.

将综合分类结果输入地理信息系统中，利用空间分析功能提取变化信息。

The water body was extracted by combining density slicing of TM 5 or TM 7 with the terrain mask produced by DEM. NDVI was used to extract vegetation information, and desertification land and salification land information was extracted by the SAM classification method. Confusion matrix shows that the classification precision is 86.2%.

对TM5/TM7波段进行密度分割，结合DEM数据生成的模板提取水体及盐漠信息；利用NDVI提取植被信息；通过光谱角分类法提取沙化土地和盐渍化土地信息。

Human's irrational development activities have brought serious effects to soil environment,such as desertification ,soil erosion,salination,and contamination etc.

人类不合理的开发行为给土壤环境带来了沉重的负面影响，主要表现为土壤沙化、土壤侵蚀、土壤盐渍化、土壤污染等。

From water loss and soil erosion,encroachment of sea water, ground subsidence ,desertification of land,soil salination,landslide and other aspects the research contents of environmental geotechnical engineering are discussed.

介绍了环境岩土工程的定义及其研究现状，从水土流失、海水入侵与地面沉降、土地砂化及盐碱化、滑坡与山崩等方面探讨了环境岩土工程的研究内容，分析了环境岩土工程的特点，并针对环境岩土工程今后的发展提出了一些建议，以供参考借鉴。

From water loss and soil erosion,encroachment of sea water,ground subsidence,desertification of land,soil salination,landslide and other aspects the research content s of environmental geotechnical engineering are discussed.

介绍了环境岩土工程的定义及其研究现状，从水土流失、海水入侵与地面沉降、土地砂化及盐碱化、滑坡与山崩等方面探讨了环境岩土工程的研究内容，分析了环境岩土工程的特点，并针对环境岩土工程今后的发展提出了一些建议，以供参考借鉴。

The main points are: groundwater level has descended to an obvious extent; nature vegetation has been degenerated completely; groundwater salination degree has increased along the Tarim River and relevant regions; desertification has developed quickly, wind-sandy disaster has been seriously increasing.

因此从恢复生态学角度深入探讨受损生态系统，建立天然植被生态系统的脆弱性评价指标体系，提出受损生态系统人工恢复与重建措施对塔里木河流域生态治理具有重要的理论与实践意义。

Minqin Basin has been undergoing a rapid decline of underground water level and a quickening process of desertification, salinification and vegetation degeneration that have greatly affected human behavior in water use, especially in agricultural production and farmers' health.

该地区地下水位迅速下降，沙漠化、土壤盐渍化、植被衰退过程加快，这些生态环境变化对人类的生产、生活造成了重大而深刻的影响，并对人类身体健康造成了持久的危害。

Firstly, influenced by climate, topographical feature, soil and hydrological and geographical features, there was drought, flood, salinification, desertification and barren in Daxing, biological protection is necessary as a protective barrier to control sand from Yong Dinghe River bed Secondly, the windbreak system has features of urban forestry with aesthetic character and reasonable forest structure and arrangement.

首先，受气候、地貌、土壤和水文地质等多种因素制约，旱、涝、碱、沙、瘠等自然灾害普遍存在，防护林体系的生态环境保护作用应当得到充分体现，要成为首都&南大门&的生态屏障保护及永定河沙地的风沙源控制带。其次，要体现大城市城郊防护林体系的建设特点，布局合理，结构合理，具有一定的风景美学价值。

The change of landuse patterns in 1977-1998 shows indirectly the desertified land had been restored and is being restored. The relationship between landuse patterns and soil types was also analysed in this paper, from 1977 to 1998, the areas of rangeland and mobile sand dunes decreased in most soil types and the areas of woodland, shrubland and farmland increased, which means that the modification of landuse patterns due to limitation of soil types will be helpful to desertification control.

同时土地利用格局的时空变化与土壤类型间关系的分析表明，1977-1998的20余年间，在四种主要土壤类型上各种土地利用类型的变化具有一定的规律性，草牧场和流动沙地的面积基本上呈减小的趋势（分布在风沙土上的草牧场面积除外），而乔木林地，灌木林地和农地面积均为增加的趋势，这说明在土壤类型这一土地自然属性的严重制约下，人们被迫调整其土地利用格局，从而有效地遏制了荒漠化的发生和发展。

In order to study the variations of fertile island during the process of desertification, the authors investigated and analyzed the soil chemical characteristics beneath and around the tamarisk shrub, the tamarisk δ^13C in saline meadow, tamarisk shrubland and sandy desert landscape in northern Taklamakan Desert, northwestern China.

为探索荒漠化过程中肥岛效应的变化规律，选择盐化草甸、灌丛及沙漠3种景观类型，测定了柽柳灌丛下和灌丛间空地土壤有机碳、全氮、水分含量以及柽柳营养枝δ^13C等指标，并用土壤养分的富集系数来表征肥岛效应的强弱。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。