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.
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.
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.
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.
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.
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.
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.
影响树木生长及木材形成的诸多气候因子中，温度最重要，尤其是在干旱、半干旱地区或高纬度地区。
Among all of the factors that affect trees growth and wood formation, temperature is the most important, especially in arid, semiarid regions or high latitude regions.
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。
Active lizard having a network of dusky dark markings; of semiarid areas from Oregon and Idaho to baja California.
沙土是存在于干旱、半干旱地区的一种特殊性土，其岩土工程性质与风沙环境紧密相关。
As a kind of special soil, aeolian sandy soil mainly lies in arid and semiarid areas where sand drift activity is very strong.
半干旱地区具有降水不匀和多变低水的特点。
The semi-arid area which grows the crops have the characteristics of uneven and little rainfall.
新海21是节水型品种，能够较充分的利用有限的灌溉水，在干旱半干旱地区具有强大的优势。
New sea 21 can save water, can use limited irrigation water, so it has advantage of power in arid and semi-arid region.
它的范围遍及中美洲，从萨尔瓦多到北部墨西哥的半干旱地区。
Its territory covers Mesoamerica, from El Salvador to the semi-arid regions of Northen Mexico.
本文在前人研究基础上，总结了中国西北部干旱半干旱地区的水文特性，降水及径流的时空分布规律。
This paper summarized hydrological characters, distribution of precipitation and runoff in arid and semiarid regions in the northwest of China on the basis of the previous researches.
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。
So that hole seeding of dryland spring wheat with autumn mulching has a high extension value in semiarid areas.
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。
Wind erosion is one of nature disaster around globe. This phenomenon is widely distributed in arid and semiarid area.
尤其在半干旱地区，对水的依赖性更强。
在东北半干旱地区，研究有限供水对干物质积累及产量性状的影响。
In semiarid area northeast, researching the effect of the dry matter cumulation and the yield character on limited water supply.
在大田条件下，研究不同灌溉量对干旱半干旱地区春小麦生长及产量构成的影响，以期为春小麦节水灌溉提供理论依据。
To supply scientific evidences of saving water, a study was made on effects of different irrigation quota on the growth and yield of spring wheat in field conditions in arid and semiarid regions.
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。
Soil erosion by wind is a major cause of farmland degradation in arid and semiarid area of north China.
水资源紧缺限制了干旱半干旱地区农业生产。
Shortage of water resources restricted agricultural production in arid and semiarid region.
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。
The field trial of plastic film mulching on dryland spring wheat was conducted in the semiarid region of Loess Plateau.
旱地管理：指对干旱和半干旱地区的管理。
Dryland (s) management: The management of arid and semi-arid areas.
中国西部干旱半干旱地区约占全国土地面积的37。
The arid and semi-arid areas in the west part of China comprise about 37.
中国西部干旱半干旱地区约占全国土地面积的37。
The arid and semi-arid areas in the west part of China comprise about 37.
应用推荐