春季健康七步曲

逐渐回升的气温已经让我们在不知不觉中感受到了春的脚步。春季阳气生发、大地回春、万象更新、生机盎然，是一年中最好的季节。然而，春天不但是流感、流脑等各种传染病的高发季节，而且冠心病、胆结石、肝炎、精神性疾病也常常容易在春天复发。俗话说“一年之计在于春”，我们做好春季的养生保健就显得更为关键。     

The New Progresses in Coupling Relations of Mountain-oasis-desert System

In this paper, the concepts and principles of mountain-oasis-desert system (MODS) are put forward according to the natural geographical situations in arid zone of western china. The spatiotemporal characteristics and dynamic changes of typical MODS, the process of material circulation, energy transform and information transmission among MODS and the mechanism of MODS interaction and symbiosis are analyzed. The foundation and frame of the coupling type are determined by landform types and climate characteristics: the spatial pattern of the coupling type is determined by the hydrological characteristics; the vegetation type reflects the appearance of the coupling type; the soil state restricts the function of the coupling type and the human activities influence the development course of the coupling type. Interface course of MODS is closely related to such medium as water, soil, air, etc., and water is the major medium during the course of material circulation, energy transform and information transmission. The disorder of water salt, water heat and water land restricts the stability of water ecosystem.     

Characteristics and laws of MODS coupling relation in arid zone under global change

Global change has influenced the distribution pattern and spatio-temporal changes of resources in arid zone, and has restrained the land use and land cover change, which is shown by water-heat state, landscape structure, climate effect, and human activities. The above-mentioned characteristics have a close coupling relation with the mountain-oasisdesert system （MODS）. The climate in Central Asia arid zone is warm and wet, which is different from that in northern China which takes a tendency of aridity, and the mechanism has restricted the characteristics and laws of MODS. Systematic interface characteristics and process, especially the formation, transformation and consumption laws of water resource reflect directly MODS＇s response to global change in arid zone. Spatio-temporal pattern, dynamic change, scale change and coupling mode of MODS reflect the ecology mechanism between the systems and within the systems.     

北京应主动适应干旱

北京境内有100多条河流．其中2／3水质达不到水功能规划要求，育一半以上属于连农田灌溉部不能用的劣五类水。为什么北京现在拥有官厅．密云两大巨型水库．利用了永定河水．潮白河水却越来越缺水？为了北京的可持续发展．有哪些方面是需要转变或改进的？本文作者从北京的历史，现实出发。探讨了北京的缺水现状．并提出了”北京应主动适应千旱“的论点。[编者按]     

怎样种好旱地小麦？

一、深浅轮耕。以土蓄水 深耕可打破犁底层，增加透水性和蓄水量，并能促进根系下扎和扩大根系吸收范围，提高水肥利用率。但深耕一定要因地、因时制宜，一般宜在整地早、降水多、墒情足的年份深耕，耕深22～25厘米，耕后耙实、耢平。在少雨干旱年份宜浅耕。实践证明，旱地小麦遇足墒深耕一年后，可浅耕2-3年。     

甘孜州春播大白菜先期抽苔原因及对策

本文通过分析和阐述甘孜州春播大白菜先期抽苔原因，品种特性、品种纯度、温度和光照、栽培管理技术等，并根据原因提出相应措施和对策。     

气候变化对农业生态环境的影响

近年来,人们惊呼气候出现了异常,全球很多地方80年代以来气温增高,而亚、美、非各大洲又大范围降水减少,干旱严重,农作物减产。我们所处的海滦河流域亦出现了类似现象。本文正是针对这些情况,对于气候变化对农业生态环境的影响进行初步探讨。