查询词典 desertification

In order to improve the environmental quality and protect the ecological safety,governments have taken some measures,But from the overall analysis,we can see that Beijing\'s ecological environment is more frangible,and ecological quality is more lower.Corresponding,the task of preventing and controlling desertification is severely difficult and important.

近年来为保障北京的生态安全和改善环境质量，国家和政府投入了巨大的财力和人力，把风沙防治作为生态环境建设的重要组成部分，开展了一系列的防沙治沙工程，使其生态环境得到一定程度的改善。

Karst soil rocky desertification is not only a geo-ecological disaster induced by Karst geomorphy, but also a critical factor restraining social and economic development of Southwest China.

喀斯特土壤石漠化是我国西南喀斯特地区诱发重要地质灾害的生态环境问题，是制约区域社会经济发展的关键因素。

Concludedly, it is pointed out that geotectonic is deeply influencing the erosion rule and is the decisive factor of desertification and lack of water in Huanghe River Valley in Shaanxi Province.(5) Based on the Theory of Dissipative Structure and the Hypothesis of Wavy Mosaic Structure, the coupling relation between eco-environment and geotectonics is theoretically discussed, and the main points are: i Degree of the order of eco-environment is higher in tectonic wave-dense belt than in tectonic wave-scatted belt.

系统研究了陕西生态环境特征和问题分析了陕西生态环境特征及陕西水土流失、沙质荒漠化、资源性缺水、主要生态系统生态功能降低等生态环境问题，运用替代市场价值法等方法估算了陕西环境问题所造成的经济损失，并估算了现阶段各种生态环境造成的经济损失，经分析认为陕西的生态环境使省域生态环境受到严重威胁，也影响着华北平原等周边地区的生态安全。

Up to May 2000, before water delivering, the cutting off runoff of lower Tarim River had been continued for 30 years, all the surface water had disappeared for a long time. It forces the environment which is originally controlled by dry circulation to develop rapidly toward dry environment. The desertification had expanded greatly. As the results, a large number of the saline meadow and halophilous shrub deserta had disappeared.

：由于近30a的断流，使本来就处于干旱环境中的塔里木河下游末端朝着更加干旱的方向急剧发展，致使原有的荒漠植被大量消失，植物成片死亡，或濒于死亡，并形成大片裸地；遗留种类极度贫乏，群落结构简单，一年生草本植物趋于灭绝。

As a result, the desertification intensification in the headwater area of the Yellow River is resulted from physical and socioeconomic factors.

黄河源区以超载过牧为主的土地资源的过度利用以及由此造成的鼠害泛滥，人为造成了广大范围草地退化、风沙活动强度的增强，从而导致人为沙漠化过程的发生与发展。

Based on spatial pattern of physical environment and socioeconomic status, the causes of desertification in the headwater area of the Yellow River are discussed using geographical information system and remote sensing.

根据黄河源区的自然环境条件、社会经济发展状况，在GIS的支持下对沙漠化发生发展的物质条件、气候条件以及人类活动等影响因子的空间格局特征、规律和变化趋势进行了定量分析。

Statistics show that in our country of the causes of desertification of grassland, accounting for 25.4% blindly reclamation; overgrazing, accounting for 28.3%; excessive ch'iao mining accounted for 31.8 percent of grassland plants.

统计显示，在我国的原因，草原荒漠化，占25.4 ％盲目开垦；过度放牧，占28.3 ％；过度樵采占百分之31.8的草原植物。

Statistics show that in our country of the causes of desertification of grassland, accounting for 25.4% blindly reclamation; overgrazing, accounting for 28.3%; excessive ch'iao mining accounted for 31.8 percent of grassland plants.

统计显示，在我国的缘故，草原荒漠化，占25.4 ％盲目开垦；过度放牧，占28.3 ％；过度樵采占百分之31.8的草原植物。

It can provide some theoretic gist for resource value of water and soil in sandy land to indicate the change and law of soil moisture character, as well as the water circulation and balance mechanism in sandy land, at the same time, it have important practical significance to protect limited water resource, improve using efficiency of water resource,control desertification, choose and educate sand binding plant, renew and restore degraded ecosystem, as well as the economy benefit of irrigative agriculture and intending trend of development.

揭示沙地土壤水分特征的变化规律以及沙地水循环和平衡机理，可以为沙地水土资源评价提供一定的理论依据，同时对于保护当地有限的水资源和提高水资源的利用效率，以及沙漠化防治，固沙植物的选育，退化生态系统的恢复与重建，灌溉农业的经济效益和未来的发展趋势都具有重要的实践意义。

Three seriousenvironment problems of the soil erosion, desertification and salinization in the aridand semiarid area not only endanger the throughput and the stability of the dry landfarming, but also jeopard the country ecosystem security.

干旱、半干旱地区的水土流失、土地沙漠化、土壤盐碱化三大环境问题，不仅直接危害北方旱地农业系统的生产能力和稳定性，而且危及到了国家生态安全建设。

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。