干旱

In East Africa, forms of cooperation and territorial organization vary with a society's core institutions, with groups such as the Nuer and the Somali characterized by segmentary lineage organization, Oromo by a generation-grading system, and the Maasai and other Nilotic societies by an age-set system.

但是牧民由于失去草场最易受威胁，这反过来刺激了冲突的增加。他认为，现代性的概念在非洲语境中过于频繁使用，很少作为生产力增长、经济发展的一种科学观念，更多受到非洲干旱土地上的牧民的怀疑。因此，牧民不应仅看作为生计方式特征的社会，而且是一个为保留土地基地而战的乡村阶层。

The water consumption patterns of seedlings were observed in normal water supply and drought stress conditions.

得出了苗木在正常水分条件下及干旱胁迫过程中的蒸腾耗水规律。

Results show that after CO2 increases double, the area of forest and rare tree steppe of grassland area in the North of China will increase, the area of the rest will decrease, and the distribution pale of most grassland vegetation have the trendency of moving westwardly and northwardly;moveover besides the area with very drought climate, the grassland production of most areas will increase at different extent, thereinto, the area of Qing—Zang have over 20% increase, the north area of Xinjiang have 10%—15% increase, the grassland production in NeiMongol have less than 5% increase.

结果表明，CO_2倍增后，中国北方草原区森林和稀树草原的面积增加，其余各类草地面积都有所减少，且大多数草地植被的分布界线都有西推北移的趋势；而除气候极干旱地区外，绝大部分地区草地生产力都有不同幅度的增加，其中青藏区增加幅度超过20%，新疆北部增加幅度在10%～15%之间，内蒙古自治区草地的生产力增加幅度不到5%。

Based on palynological data,we suggest that the retreat of the Tethys and Parat ethys from southern and Central Asia in Eocene and the uplift of Qinghai-Xizang Plateau in Miocene have largely shielded the monsoon climate northwestward,and have resulted in the Tertiary aridification in NW China.

文章依据孢粉资料讨论我国西北地区第三纪时期植被的演变情况，认为始新世时古地中海和副古地中海自南亚及中亚地区的撤退，以及中新世时青藏高原的隆起对东亚季风的屏蔽，都对西北地区的干旱化起了重大作用。

The drought in NW China is one of the main problems of climate disaster of China and global change.

西北地区干旱化是我国气候灾害和全球变化的主要问题之一。

Davidii seedlings. Two-month-old seedlings were grown under water supply regimes of 100, 80, 60, 40 and 20% water-holding capacity, respectively, in an open-sided greenhouse.

结果显示，胁迫处理96d后，100% WHC条件下白刺花幼苗的总叶面积、分枝数、基径及最大根长等均最大；80% WHC对幼苗产生了轻度胁迫，随着干旱胁迫强度的进一步增加，幼苗生长显著减小。

Contrasting cool ocean currents in the Pacific can usher in the opposite phase, La Nina, which tends to dry out the southwestern and South Central states.

形成对照的太平洋中的寒流，则会迎来一种相反的状况，拉尼娜现象。它倾向于给西南和中南部各州带来干旱。

Contrasting cool ocean currents in the Pacific can usher in the opposite phase, La Nina, which tends to dry out the southwestern and the South Central States.

与此相反的太平洋寒流会引起一种相反的状况，拉尼娜现象。拉尼娜现象会给西南部和中南部各州带来干旱。

It can make slow changes of soil temperature. It decreased the quick changes of soil temperature caused by the sudden changes of air temperature, and maintain the normal growth of the trees, in addition, it increased air humidity in plum orchard. It eased the drought status during period of high temperature. Sown grass in plum orchard can increase soil organic substance, total N, available N, available F, and available K.

果园生草可以使土壤温度变化缓慢，缓解气温的骤变造成地温的急剧变化，维持树体的正常生长；提高果园空气湿度，缓解了旱期由于高温干旱造成的生长停滞；提高土壤有机质、全氮、速效氮、磷、钾的含量。

Aridfication ; the ordered human activity ; field experiment ; turbulent flux between ; land surface and the atmosphere

干旱化；有序人类活动；观测实验；地气界面；湍流通量

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。