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.
华北地区位于干旱和半干旱地区。
摘要华北地区位于干旱和半干旱地区。
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.
主要分布于西北、华北和东北干旱和半干旱地区。
They are mainly distributed in the northwest, north and northeast China arid and semi-arid areas.
在辽宁省西部干旱和半干旱地区建议采用以留茬覆盖为主的保护性耕作方式。
Remaining of stubble and straw covering was suggested to be adopted in western arid and semi-arid areas of Liaoning province.
干旱和半干旱地区常伴有季节性或难以预期的干旱，其结果会对农业生产造成严重影响。
Arid and half arid area often suffer the drought which has the seasonal characteristic or difficult anticipated, its result can have the serious influence to the agricultural production.
因此，研究如何提高干旱和半干旱地区作物产量和水分利用效率有较高的应用价值和现实意义。
Therefore, how to enhance arid and half arid area crops output and Water using efficiency has the important practical significance.
施水沟播机可在起垄施肥播种的同时进行施水作业，从而解决了干旱和半干旱地区的播种保苗问题。
Water application furrow seeder for arid and semi arid region can carry on the watering operation as sowing and fertilizing with the objective of seedling prevention.
我国干旱和半干旱地区面积约占全国土地面积的1/2，同时，随着全球温室效应的增强，对抗旱品种的选育将是未来品种的选育的一个重要方面。
China's arid and semi-arid land area accounting for about 1/2, while, with the enhancement of Greenhouse effect, the of drought-resistant varieties breeding will be an important aspect in the future.
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.
生物土壤结皮广泛分布在干旱半干旱地区与寒区荒漠，是荒漠生态系统的主要组成和景观特征之一，其重要性已被大量的研究报道所证实。
Soil microbiotic crusts are widespread in arid and semiarid regions, they are one of the major components of desert ecosystems, and their importance has been demonstrated by numerous researches.
在我国由于水资源日益短缺，干旱半干旱地区土壤干旱和盐渍化问题越发严峻。
With ingravescent fresh water scarcity, the situation of drought and soil salinity get even worse in the arid and semi-arid areas of China.
黄土高原半干旱地区干旱发生的经常性、持续性、广泛性和危害性，决定了解决农田抗旱问题的复杂性和艰巨性。
The regularity, durativity, normality and harm of drought in semiarid region on the Loess Plateau, result in the complexity and hardness to deal with in farmland drought management.
龟纹瓢虫propylaeajaponica是我国干旱、半干旱地区农林果蔬生产中重要的捕食性天敌之一，尤其在夏季高温、干旱的情况下，对果园、棉田的幼龄害虫和卵的捕食作用非常明显。
Propylaea japonica is one of important predatory natural enemies in arid and semi-arid area China, especially those preying on younger larvae and eggs of insect pest in orchards and cotton fields.
龟纹瓢虫propylaeajaponica是我国干旱、半干旱地区农林果蔬生产中重要的捕食性天敌之一，尤其在夏季高温、干旱的情况下，对果园、棉田的幼龄害虫和卵的捕食作用非常明显。
Propylaea japonica is one of important predatory natural enemies in arid and semi-arid area China, especially those preying on younger larvae and eggs of insect pest in orchards and cotton fields.
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