During the development and deposition about the fouth member of shahejie formation , bonan sag is under the condition of arid to semiarid climate 沙四上段发育时期，渤南洼陷处于干旱?半干旱气候条件下，表现为东北陡、西南缓的箕状洼陷。
The occurrence of variegated polymictic conglomerate sediment , mud cracks , gypsum strata and so on can provide evidences for aridity climate in western liaoning 两剖面复成分砾岩杂色沉积、泥裂、石膏层等为该区可能存在的干旱气候提供了依据。
Climatology and environment on the plateau : main focuses are plateau climatology and environmental dynamics , arid climatology , and thunder lightning physics and the mechanism of its resulting hazards 高原大气物理研究：主要方向有高原气候与环境动力学；干旱气候；雷电物理与雷害机理。
Researcher dan nepstad calls it a " perfect storm " of deforestation : as fire and ranching destroy the amazon forest in brazil , the remaining trees release less moisture , producing a dryer climate that kills more trees 研究员丹称他为伐林中的“完美风暴” ：当火灾和伐木摧毁巴西的亚马逊森林，保留下来的树木释放出比原来少的湿气，产生的干旱气候将扼杀更多的树木。
Some scientists say a hotter planet could be to blame for such natural disasters as the year ' s wildfires in the western united states , and growing drought conditions in africa , and typhoons which caused mudslides in china and the philippines claimed thousands of lives 专家称，全球变暖可能是某些自然灾害的主要缘由，如美国西部常年起火，非洲的干旱气候，由台风而引起的已夺命数千人的中国及新加坡地区泥石流。
Some scientists say a hotter planet could be to blame for such natural disasters as the year ' s wildfires in the western united states , and growing drought conditions in africa , and typhoons which caused mudslides in china and the philippines claimed thousands of lives 一些科学家认为，今年在美国西部发生的野火和非洲地区不断加剧的干旱气候、以及在中国和菲律宾引发了导致数千人死亡的泥流的台风，诸如此类的自然灾害很可能是由全球变暖引起的。
In this paper firstly the severity and complexity of aridity disaster among variety of natural disasters are stated ; then the advances in some aspects of arid climate researches over northwest china in past 20 years , such as its distribution features , forming causes , some inter - comparisons of arid climates , and its monitoring and predicting , are briefly reviewed ; finally some room of northwest china arid climate researches for improvement are also pointed 摘要首先阐述了自然灾害中干旱灾害的严重性和复杂性；接着从西北干旱气候的时空分布特征、形成原因、干旱气候的比较以及监测和预测等方面回顾了近20年来我国西北干旱气候研究的进展；最后提出了西北干旱气候待研究的问题。
Ministry of science and technology decided to deal with this problem by building windbreak forest system , so some plants , which grew well in sand areas and defend people from the sand and the pollution , were selected to grow in sand areas . some plants which have strong resistance to adversity should be researched , 为科学选择适应干旱气候条件的沙生植物，需要对抗逆性强的植物的适应逆境条件的机制进行系统而深入地研究，以便为沙生植物的选择提供科学的依据。
Due to the inland climate , which is featured with less rainfall and strong evaporation , it becomes critical how to rationally allocate the scarce water resources between the ecological environment maintenance and economic expansion in gansu province , however , as an inevitable trend , the balance of water resources allocation has to find the way by reducing irrigation utilization of water without harming sustainability of agricultural development 摘要地处西北内陆的半干旱与干旱气候区的甘肃省，降水资源少且分布不均，水资源的配置必须在保证生态环境建设必要用水和社会经济合理用水的同时，大力节约并逐步压缩农田灌溉用水。
2 . according to the weighted average , soil co2 concentration is 0 . 58 - 13 . 29 times of that in atmosphere and is relatively lower than similar research , meanwhile , soil co2 concentration in profile varied irregularly , which possibly is due to the chemical and physical characteristic of loess soils , season change and arid climate etc . the variation of soil co2 concentration in profile is mainly controlled by soil temperature and soil moisture , in contrast with soil temperature , the control role of soil moisture is minor . in conclusion , in order to have a good command of the distribution and change rule of soil profile co2 concentration as well as its effect factors , multi - point and successive location experiment should be made , meanwhile establish indoor soil - pillar monitoring experiment 土壤co _ 2的浓度约为大气co _ 2浓度的0 . 58 ? 13 . 29倍与同类研究相比要低，这是与黄土的土质特性，观测期又逢特别干旱年制约了土壤微生物的活动，再加上土壤中有机质亏损，养分不足造成的；土壤co _ 2含量的变化是随温度的升高而升高，在夏季达最高值，冬季最低；在土壤co _ 2浓度变化的影响因子温度和水分中，温度的影响作用高于水分；土壤剖面co _ 2浓度随着深度增加，总的变化趋势是递增的，但也有反复，甚至有的顺剖面而下几乎保持一恒值，这与季节变化和黄土自身结构的通透性以及在观测期内的干旱气候等条件有关。
