Shrub expansion has occurred in other environments, like semiarid grassland, and tall grass prairies.
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。
The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.
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。
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.
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 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.
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。
The semiarid lands bordering the deserts exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures.
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 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.
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 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.
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 region is semiarid to arid in overall climate.
这个地区总体上是半干旱至干旱气候。
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。
North China is situated in arid and semiarid regions.
华北地区位于干旱和半干旱地区。
North China is situated in arid and semiarid regions.
摘要华北地区位于干旱和半干旱地区。
Terpenoids are more prevalent in some arid or semiarid climates.
萜类在某些干旱或半干旱气候条件下较为普遍。
The afforestation in arid and semiarid is restricted by water condition.
干旱区和半干旱区的造林主要受水分条件的限制。
Aeolian sandy soil is a kind of specific soil formed in arid or semiarid area.
风沙土是形成于干旱区、半干旱区的一种特殊性质的土。
Desertification drains an arid or semiarid land of its life-supporting capabilities.
沙漠化使干旱或半干旱地区维持生命的能力逐渐枯竭。
Desertification drains an arid or semiarid land of its life - supporting capabilities.
沙漠化使干旱或半干旱地区维持生命的能力逐渐枯竭。
Groundwater overexploitation is very serious in arid or semiarid areas of North China.
北方干旱、半干旱地区地下水超采严重，水资源供需矛盾突出。
The salinity of lake water is a sensitive monitor of climate in arid and semiarid region.
在干旱半干旱地区，封闭湖泊的湖水盐度对气候变化反应敏感。
Shortage of water resources restricted agricultural production in arid and semiarid region.
水资源紧缺限制了干旱半干旱地区农业生产。
Cereal production is the most basic function of cropland, particularly important over semiarid areas.
粮食生产功能是耕地最基本的功能，在半干旱区有着特殊的重要性。
Soil erosion by wind is a major cause of farmland degradation in arid and semiarid area of north China.
土壤风蚀是中国北方干旱半干旱地区农田土地退化的重要原因。
This technique proves suitable to semiarid areas for the purpose of increasing rainwater use efficiency.
该技术是适合于半干旱地区的一种能较好提高降水利用率的种植方式。
So that hole seeding of dryland spring wheat with autumn mulching has a high extension value in semiarid areas.
因此，旱地春小麦秋覆膜穴播栽培技术在半干旱地区有较高的推广价值。
Active lizard having a network of dusky dark markings; of semiarid areas from Oregon and Idaho to baja California.
身上有网格状深色斑点的活跃的蜥蜴；产于从俄勒冈和爱达荷到加利福尼亚巴加的半干旱地区。
Aeolian sandy soil is a kind of specific soil formed in arid or semiarid area. It has specific engineering property.
风沙土是形成于干旱区、半干旱区的一种特殊性质的土。
Wind erosion is one of nature disaster around globe. This phenomenon is widely distributed in arid and semiarid area.
风蚀是全球性的自然灾害之一，此现象广泛分布于干旱半干旱地区。
Dry farming; dryland farming: a system of producing crops in arid and semiarid regions without the use of irrigation.
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。
The field trial of plastic film mulching on dryland spring wheat was conducted in the semiarid region of Loess Plateau.
在黄土高原半干旱地区，对旱地春小麦进行短期地膜覆盖试验。
Otindag Sandland is one of the main sandlands and among the most seriously desertificated region in semiarid area of China.
浑善达克沙地是我国北方干旱半干旱区的主要沙地和严重荒漠化地区之一。
The chemical laboratory of the Semiarid Prairie Agricultural Research Centre of Canada is very influential in western Canada.
加拿大半干旱草原农业研究站化学实验室在加拿大西部很有影响。
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