过往沙漠的南部边界比现在的边界更靠北，而半干旱的草原和较浅的淡水湖泊覆盖了现在干旱平原的大部分地区。
The southern frontier of the desert was far to the north of where it is now, while semiarid grassland and shallow freshwater lakes covered much of what are now arid plains.
在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。
In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.
一路上，我们破坏了大多数我们曾经耕作过的的土地，经常把翠绿的自然生态区变成了半干旱的沙漠。
Along the way, we despoiled most of the land we worked, often turning verdant, natural ecozones into semi-arid deserts.
本文综合分析了半干旱的吉林西部地区水文地质环境与土地盐碱化的关系。
This paper is based on comprehensive analysis of hydrogeologic environment to discuss the relations between water resource and land salinization in semiarid region.
这就意味着它在东部和南部非洲的树丛繁盛的栖息地同时半干旱的灌木丛里搜寻食物。
This means that it spends its days searching for food in the semi-dry bush in scrubby habitats of eastern and southern Africa.
此外，元素的组合规律初步表明河南西峡晚白垩世时的气候应具有干旱、半干旱的特征。
Moreover, the elementary combination rule basically indicated the climate in Xixia, Henan Province characterized by semiaridity and aridity in the Late Cretaceous.
我国黄土高原西部地区，包括甘肃、宁夏和青海的海东地区，位于干旱和半干旱的气候类型地带。
The western area of 1oss plateau of China, including the area of GansuProvince, Ninxia Hui Autonomous region and Haidon district of QinghaiProvince, lies in the arid and semi-arid climatic zone.
黄土高原半干旱的气候条件、稀疏的植被和疏松易蚀的黄土物质，是该地区高含沙水流形成的自然地理因素。
Semi arid climate, poor vegetation cover and highly erodible loess can be regarded as the main natural factors responsible for the formation of hyperconcentrated flows in the Loess Plateau, China.
只有纳米布沙漠，据说是地球上最古老的沙漠，这儿处处保持至少半干旱的条件已有5500万到8000万年。
Just the Namib Desert, said to be the oldest on Earth, having maintained at least semi-arid conditions for anywhere between 55 and 80 million years.
十年前他回到肯尼亚以后，建起了“肯尼亚山有机农场”，目的是为了帮助其它小农场主战胜周围半干旱的环境。
On his return 10 years ago, he set up the Mt Kenya Organic farm, aimed at aiding other small farmers fighting the semi-arid conditions.
灌木的扩张也发生在其他环境中，比如半干旱草原和高草草原。
Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.
另一方面，在干旱和半干旱地区，湖泊数量少，湖泊之间距离远，减少了相互关联的可能性。
In arid and semiarid regions, on the other hand, the small number of lakes and the great distances between them reduce the possibilities for correlation.
沙漠边缘的半干旱土地处于非常脆弱的生态平衡之中，而这些半干旱区域对于持续增加的环境压力的适应能力极其有限。
The semiarid lands bordering the deserts exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures.
美国西南部半干旱地区的湖泊水位在上一个冰河时代似乎比现在更高，这一事实曾一度归因于降水增加。
The fact that lake levels in the semiarid southwestern United States appear to have been higher during the last ice age than they are now was at one time attributed to increased precipitation.
在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。
The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.
侯赛因及其同事长期的研究表明，大坝尤其使干旱或半干旱地区的极端降水模式发生改变。
The long-term studies by Hossain and his colleagues suggest that dams have particularly altered extreme precipitation patterns in arid or semiarid areas.
马兰豪州南部是棕榈树最为集中的地方，分布在巴西的半干旱地区东北部和亚马逊雨林交界的地区。
The trees are most heavily concentrated in the south of Maranhão, in the transition zone between Brazil's semiarid northeast and the Amazon rainforest.
蒙古位于半干旱地区，其气候易受严寒天气和极其干旱夏季天气的影响，正因为如此，牧民们总是要想方设法地维持稳定收入。
Maintaining a regular income is a constant battle as the climate in this semi-arid country is prone to severe, freezing winters and extremely dry summers.
雨水在许多地方可能会变得更加密集与多变，处在干旱和半干旱热带区的农民可能会变得更加脆弱。
Rain was likely to become more intense and variable in many places, and farmers in the arid and semi-arid tropics were likely to become more vulnerable.
该机构表示，气候变化让半干旱国家(如苏丹)的粮食更为稀缺。
Climate change, it says, will make food even scarcer in semi-arid countries such as Sudan.
首先，国际半干旱热带作物研究所绘制了珍珠谷子的基因区，这些谷子可控制干旱条件下的霜霉病抗性、谷物产量和产草量。
First, ICRISAT mapped the genomic regions of pearl millet that control downy mildew resistance, grain production and straw yield under drought conditions.
在80和90年代的大部分时间，达尔富尔以及西非荒漠(撒哈拉以南半干旱地区)的其他地区发生的环境退化主要是由于当地居民。
For much of the 1980s and '90s, environmental degradation in Darfur and other parts of the Sahel (the semi-arid region just south of the Sahara) was blamed on the inhabitants.
田间试验研究了西北干旱半干旱地区地膜覆盖对土壤中n 2o排放通量变化的影响。
Field experiments was used to study the change of soil N2O discharge flux in the northwestern arid and semi-arid areas.
这为干旱、半干旱地区制定合理的土地利用规划提供了科学依据。
This provides scientific basis for rational land use planning in arid and semi-arid areas.
旱地耕作法指一种在干旱或半干旱土地上不使用灌溉方法生产作物的耕作制度。常常采用一年休耕、一年种植的方法。
Dry farming; dryland farming a system of producing crops in arid and semiarid regions without the use of irrigation. Frequently alternate years of fallow and cropping are practiced.
旱地耕作法指一种在干旱或半干旱土地上不使用灌溉方法生产作物的耕作制度。常常采用一年休耕、一年种植的方法。
Dry farming; dryland farming a system of producing crops in arid and semiarid regions without the use of irrigation. Frequently alternate years of fallow and cropping are practiced.
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