查询词典 arid region

Land desertification is one of the most main types of land degradation in the arid and semiarid region,northern China.

土地沙漠化是我国北方干旱半干旱地区土地退化最严重的类型之一。

The North-western region of China, where it is arid or semiarid, is the most important in stock-raising of the country.

地处干旱半干旱带的西北地区，是我国最重要的畜牧业基地。

The region is semiarid to arid in overall climate.

这个地区总体上是半干旱至干旱气候。

Wedelia trilobata is a species of Asteraceae arid primarily native to tropical Central and South America; it had been frequently introduced for gardening. Nowadays it has widely been distributed in the region of South China and other seaside.

南美蟛蜞菊Wedelia trilobata为菊科蟛蜞菊属植物，原产中、南美洲，由最初的绿化引进开始，现广泛分布于我国华南地区及沿海部分地区。

During ～2.68-2.45 Ma, the vegetation was dominated by arbores, mainly Pinus, Chenopodiaceae and Artemisia, indicating a cold warm climate in the mountain region. During ～2.45-2.11 Ma, herbs increased rapidly and the climate became dry-cold, indicating the characteristic of the bushveld climate. During 2.11-1.49 Ma, the quantity and species of the herbs reached the culmination and the bush increased accordingly, showing that the climate became more and more arid. During 1.49-1.36 Ma, herbs declined slightly but pteridophytes increased relatively greatly, revealing a dry-cold grassland climate.

约在2.68～2.45Ma期间，植被以乔木为主，主要为松、藜、蒿，属山地寒温气候；约在 2.45～2.11Ma期间，草本植物迅速上升，气候变得干旱寒冷，显示出灌木草原气候特征；在2.11～1.49Ma期间，草本植物数量和种类达到之最，灌木相对增加，也显示气候进一步趋于干旱；在1.49～1.36Ma期间，草本植物有小幅下降，但蕨类植物增加幅度较大，显示了干冷草原气候特征。

ABSTRACT This dissertation, based on the theories of geography, ecology, economics, sociology and environmental sciences, has analyzed the impact of transition between cultivation and pasture animal husbandry on the mechanism of desertification in Kerqin Sandy Region, of which behavior mechanism of local people was emphasized. The changing direction of integrated land desertification control strategy in semi-arid regions was discussed after having explored the primary reasons of estrepement, overgrazing and excessive firewood gathering. Followings are the main research works having been done.

本文选取科尔沁沙地作为研究区域，以两种最主要的土地利用方式、也是两种最主要的生产方式——农、牧业作为研究对象，依据地理学、生态学、经济学、社会学与环境科学的基本理论与方法，基于现有研究资料的系统整合，结合野外调查的结果，从更加综合的角度，来研究农、牧业选择变化对沙漠化过程的影响机理，从农、牧业选择变化的角度来揭示&滥垦、滥牧、滥樵&的本质，进而寻求中国北方半干旱地区生态环境综合整治的对策。

The inland arid area of China is very broad,such as Hexi corridor of Gansu Province, Ta Limu Basin and Zhun Ge'er Basin of Xinjiang Uygur Autonomous Region, Chai Damu Basin of Qinhai Province that are all the type of Gobi and generated by the dry climate condition. There are broad plain area and abundance heat resources of sun in these basins.

我国内陆干旱区面积广阔，均为干旱气候条件下所形成的典型戈壁沙漠地区，主要包括甘肃河西走廊、新疆准噶尔盆地、塔里木盆地及青海柴达木盆地等内陆盆地。

The plants of the family Tamaricaceae, a family with long history, have occurred in ancient Mediterranean region since Tertiary. Most of them are drought-telerant plants, which are suitable to be used as wind-preventing, forest-making and soil-holding plants. Ecologically, they are plants of great importance in reforming of desert and improving of climate condition in arid zone.

柽柳科是一个古老的科，起源于第三纪，包括亚洲中部的内的&古地中海&沿岸地区，该科植物主要为旱生植物，其中大多数种是防风、固沙造林和水土保持的优良树种，对改造沙漠和改善气候条件具有重要的生态意义。

Results provide scientific basis for promoting development of water-saving farming system and the optimal allocation of water resources in arid area of Xinjiang Region of China.

该研究为推动新疆干旱区节水农业的发展和水资源的优化配置提供了科学依据。

As the key production element,land resources have played a very important role in the social economic development in arid northwest region.

对于西北干旱区，土地资源作为一种关键的自然要素，对区域经济发展起着至关重要的作用。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。