查询词典 desertification

Government takes lots of measures to combate desertification on serious condition. This thesis study on theory and method about desertification combating engneering profit evaluation.

在荒漠化形势非常严峻的情况下，国家采取了相应的荒漠化防治措施，在此本文对荒漠化防治、防沙治沙工程效益评估的理论和方法进行了研究，在此基础上对沽源县京津风沙源治理工程的效益进行了计算和分析。

The cause of desertification is one of important parts in desertification research.

土地沙漠化成因机制的研究具有非常重要的理论与实践意义。

It accelerates land desertification,but also is the form of land desertification developed to a certain degree.

它的发生既是一种加速土地荒漠化的重要过程，又是土地荒漠化发展到一定程度的具体表现。

Taking Sunan County in Qilian mountain area as an example mountain-grassland desertification, the paper analyzes the causes the present state and the imperilment of in Qilian mountain area, and combining its history, from the perspective of nature and humans probes into reasons of grassland desertification.

以祁连山区肃南县为例，分析了祁连山区地草原荒漠化的现状及其危害，并结合历史，从自然和人为两方面探讨了草原荒漠化的成因。

Taking Sunan County in Qilian mountain area as an example mountain-grassland desertification,the paper analyzes the eauses the present state and the imperilment of in Qilian mountain area,and combining its history,from the perspective of nature and humans probes into reasons of grassland desertification.

以祁连山区肃南县为例，分析了祁连山区山地草原荒漠化的现状及其危害，并结合历史，从自然和人为两方面探讨了草原荒漠化的成因。

It is shown that from 1994 to 2000, desertification and salification land increased obviously, whereas from 2000 to 2002, desertification and salification land changed only insignificantly.

结果表明，1996~2000年间，研究区内荒漠化土地明显增加； 2000~2002年间荒漠化土地面积变化较小。

This dissertation focuses on land desertification of the middle reaches of the Tarim River. Taking the train of thought and methods that combining aerial remote sensing and historical material with ground investigation and indoor comprehensive analysis, macroanalysis with micro-analysis, qualitative research with quantitative research, and expressing the result of research by means of mapping, the author makes a systematic research on land desertification.

本文以塔里木河中游地区为研究区域，并以英巴扎地区作为典型区，根据对前人已有成果的学习和吸收，采用航空遥感与地面调查、历史资料与室内综合分析工作相结合，宏观分析与微观分析相结合，定性研究与定量研究相结合，最终以制图手段表现研究结果，并据此进一步综合阐述和探讨研究区域土地沙漠化特征与形成机制以及发展趋势和沙漠化的防治对策的思路方法，对研究区土地沙漠化进行了系统研究。

Different desertification around the world, including Turkestan Mojave Desert and desertification, are Ya terrain.

世界各地的不同荒漠，包括突厥斯坦荒漠和莫哈韦沙漠在内，都有雅丹地形。

Based on a rather long temporal series of remote sensing data, employing RS and GIS as its tool and FVC that is of rather high sensitivity over the coverage of vegetation in arid area as its monitoring index of desertification, the dissertation analyzes the features of the dynamitic variation of desertification in Xinjiang over the years by using the slop variation to reflect the features of temporal-spatial distributing and the changes of areas of the desertification in Xinjiang.

以较长时间序列的遥感数据为基础，以RS和GIS为工具，选择了在干旱区对植被覆盖度上有较好敏感性的FVC的斜率作为荒漠化监测指标，利用1982~2000年期间新疆FVC斜率变化来反演新疆土地荒漠化的时空分布、面积变化，分析新疆荒漠化多年来动态变化特征； 3。

Results are as following:The causes of grassland desertification of Hulunbeir are the outcome of interaction of nature and the human beings. Among these reasons, the loose soil texture, which was formed in the fluviolacustrine sediment during Quaternary, establish the physical ground, and the drought and wind is the natural force of grassland desertification. And then over-cutting forest, over-grazing grassland, imbalance of resource utilization and estrepement reduce the coverage of vegetation, therefore provide necessary conditions for the grassland desertification.

其中，形成于第四纪河湖相沉积沙的疏松土壤母质，为日后土壤风蚀奠定了深厚的物质基础；干旱多风的气候条件构成了草地风蚀沙化的自然营运力；而人为过度砍伐沙地林木资源、沙质草地长期超载放牧、资源利用不平衡以及乱垦、滥挖等不合理经济行为，又降低了沙化草地植被覆盖度，为草地风蚀沙化提供了必要条件。

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。