荒漠化

Desertification is one of most serious environmental and social-economic problem in the world, which has been suffering China for a long bine.

土地荒漠化已成为受其影响地区经济发展和环境保护的一个重要障碍，及时了解其过程、现状和发展趋势，对确定荒漠化防治的战略和措施均有重要意义。

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。

Sandy desertification and soil salinization are two types of desertification in western Northeast Plain of China.

中国东北平原西部土地荒漠化，主要表现为土地沙漠化和土地盐碱化，它属于荒漠化的两种类型。

Soil erosion by wind, as a natural disaster haunts on dry lands, not only degrades soil productivity but also often results in dust blizzard weather. It may cause pollutions of air and water, damages of highway and railway, wear and tear of buildings and machinery and harmfulness in health of people and animals. Therefore, to combat wind erosion means improving the environment for people to live and work, means heightening the living standard of the local people, and means promoting productive forces. But China has a vast land where probably occur wind erosion disasters, the arid, semiarid and subhumid areas of the temperate zone all are potentially hit by wind erosion. To control wind erosion in China is a very arduous task. More difficult is to achieve recognizable effectiveness with lowest cost.

中文题名宁夏土壤风蚀研究副题名外文题名 Estimation of wind erosion in Ningxia 论文作者李玉宝导师王礼先孙保平教授学科专业水土保持与荒漠化防治研究领域\研究方向荒漠化防治学位级别博士学位授予单位北京林业大学学位授予日期2001 论文页码总数100页关键词风蚀土壤风蚀土壤侵蚀馆藏号BSLW /2003 /S157 /14 中国发生土壤风蚀的潜在区域包括温带干旱、亚干旱和亚湿润气候下的广大地区，如何有效地预防和治理土壤风蚀，如何以最小的代价达到满意的防治效果，这是很值得研究的问题。

The advantageous one mainly included different measures of vegetation restoration such as fencing, rehabilitated fields, abandoned land etc. and polices or laws about desertification debating. The disadvantageous influences included illegal grazing, estrepement, firewood cutting and so on.

有利因子如退耕还草、人工封育、撂荒等草地植被恢复及荒漠化防治措施以及相关的荒漠化防治政策法规的实施，不利因子如偷牧、滥垦、滥樵等。

It was pointed out that shrub invasion occurs during the process of conversion of farmland to grassland and overgrazing.

以沙质荒漠化正处在发展过程的河北坝上地区和沙质荒漠化严重的科尔沁沙地流沙治理区为例，结合国内外已有的研究成果，探讨草原沙质荒漠化的主要生物学机制。

At last, according to the characteristics of desertification, some countermeasures and antidotes to the problem is proposed on the basis of analyzing causes and mechanism on desertification.

最后，在成因及形成机理分析的基础上，针对柴达木地区荒漠化特点提出了荒漠化防治的原则、对策、措施以及荒漠化防治的动态监测和法律支撑体系。

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。