干旱

Soil CaCO3 eluviation and deposition process is the most important development and evolution process of soil, from parent material to mature soil in the Loess Plateau, arid and semiarid area.

土壤碳酸钙(CaCO_3)的淋溶淀积过程是黄土高原以及干旱和半干旱地区土壤形成发育的主要过程之一，也是地球化学过程的主要内容。

The results showed that there existed significant difference in chlorophyll a, MDA and proline content among different treatments. No significant physiological variation was found in electrolyte exosmosis percentage, POD activity and proline content between the salt treatment and the control during the treatment while the parameters in drought and salt/drought treatment fluctuated remarkably.

结果表明：欧李的叶绿素a、丙二醛和脯氨酸含量在不同的逆境处理间差异显著；碳酸盐处理的电解质外渗率、POD活性、脯氨酸含量等生理指标变化平缓，与对照差异不明显；干旱处理和盐与干旱协同处理的各项指标波动很大。

The Necessity of water saving agriculture in the loess plateau of China is analysized,and main types of regulating soil water techniques are sumed up as follows:accumulating fertileness,crop rotation,intermittent fallowness of soil,drought resistant crop breeding, water saving ,run off agriculture and chemical methods.

分析黄土高原节水农业的必要性，总结出黄土高原农业调水技术主要有 7大类：培肥地力以肥调水，轮作倒茬调水，间隙休闲调水，抗旱育种调水，节水灌溉调水，径流农业调水，化学技术调水；指出在干旱、半干旱的黄土高原地区，利用农业调水技术是粮食增产增收的有效措施和必然趋

Populus is one of the most popular trees in artificial intensive forestry, to select fast growing clones with high WUE rapidly and efficiently is exigent desire of breeding researcher.

本文通过模拟自然干旱和土壤逐渐干旱两种方法对黑杨新品系间的WUE进行了比较，并对WUE差异的机理进行了初步研究，以期为林木育种实践提供可行的方法和理论依据。

Glomus mosseae also show the obvious positive effect on servivaling of rice bean under rigor soil condition.

在干旱条件下，接种Glomus mosseae显著改善植株的生长状况，植株对菌根真菌的依赖性随干旱程度的增加而增加。

In experiment,we controlled soil moisture by methods of artificial rainfall and restoring water in soil post;soil treatments included non-cover,mealie haulm cover and gravel cover.

在干旱半干旱的黄土高原和广大的荒漠地区，林地的生态系统十分脆弱，土壤水分动态制约着这些地区生态恢复与植被重建工程的可持续性[1]。

Under the effect of both the natural and the social factors, Urumqi has a serious air pollution problem and poor environment quality. To make things much worse, it is located in a typical arid and semiarid hungriness, which add to the difficulty and requirement of the landscape greening. Since Urumqi is stepping up her way to National Garden City at present, the research of her urban greenbelt landscape is of great practical significance.

乌鲁木齐市处于典型的干旱、半干旱荒漠背景下，在自然因素和社会因素的综合作用下，大气污染严重，环境质量较差，园林绿化难度较大、要求较高，且乌鲁木齐市当前正在创建国家园林城市，对其城市绿地景观的研究具有积极重要的现实意义。

Loess Plateau is locate in areas transited from semi-arid and semi-humid areas to arid hungriness area, Because of the influence of war and long-term\'s unreasonable utilization, the ecological environment in this region is poor and serious soil and water loss is heavy. The water and soil conservation ecosystem project of emphasis tributary is implemented by Yellow River Committee from 2000, during several years centralized treatment,Project Construction have got remarkable effect.

黄土高原地处我国从半湿润半干旱带向干旱荒漠带过渡的地区，由于受历史上战乱和人为不合理开发利用的影响，生态环境比较脆弱，经济发展滞后，水土流失严重。2000年以来，黄委会启动实施了以黄河多沙粗沙区为治理重点的黄河水土保持坡面生态工程的重点支流治理项目，经过几年投资集中治理，项目建设成效显著。

Due to the inclemency of climate and soil conditions and the intense disturbance of human beings,the soil resources heterogeneity in arid and semi arid grassland ecosystems worldwide was gradually increased during the last century.

世界许多干旱、半干旱地区草地生态系统逐渐被灌木生态系统取代，这种取代过程的发展是由灌木冠幅下土壤中"肥岛"的形成和灌木的扩散相互作用直接造成的。

The results showed that the photosynthetic rate of B.stamineus decreased with the increasing of the drought gradient,but the decrease amplitude was less.The photosynthetic rate of B.inermis decreased indistinctively with the increasing of the drought gradient in the prometaphase,decreased distinctively in the later stage.

结果表明：美国无芒雀麦的光合速率基本上随着干旱梯度的增加而逐渐下降，在不同胁迫天数间也逐渐下降，但下降幅度较小；本地无芒雀麦各干旱处理光合速率在胁迫前中期随胁迫梯度的增加下降不明显，到胁迫后期才表现出较为明显的下降趋势，但在各胁迫天数间差别不大，仅在胁迫第20 d各处理光合速率较之前有较为明显的降低。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了