不同草原类型下气候和土壤对植物叶片碳水资源获取和利用性状的影响

“最小成本理论”(least-cost theory, LCT)反映了植物叶功能中光合作用所需水资源和碳资源的共同优化投资方式，已在全球和许多区域尺度得到了有力的支持。目前，有关干旱、半干旱区不同草原类型的区域尺度下植物光合作用水碳资源获取和利用策略的研究少且缺乏相应的理论指导。本研究以我国甘肃省从东到西沿降水梯度下的森林草原、典型草原和荒漠草原共3种草原类型中的71个物种为对象，运用LCT理论模型来分析该区灌木、草本植物叶片的水碳资源获取和利用功能性状间的关系及其随气候和土壤梯度的变化规律，并在此基础上构建与单位面积氮含量(N_area)变化相关的多元线性模型。结果显示：比叶重(LMA)和N_area均随光合有效辐射的增强而增大，随年均降水量、年均最低温以及土壤黏粉粒含量、土壤水分含量和土壤有机质含量的增加而降低，但胞间CO₂与空气CO₂浓度比(c_i∶c_a)随气候和土壤变化的趋势与LMA和N_area相反；3种不同草原类型下，N_...     

写在2009年新春

2008年过去了，对这一年的感触，我们只能说：“难忘，不平凡!”国人经历了太多的刻骨铭心。5·12的强烈地震，不仅撕裂了大的完美亮相，展示了真正的中华形象。灿烂的烟花和迷人的笑脸是2008盛夏最好地，也撕裂了同胞的心；而奥运盛会又让中华民族再次振奋了雄心，世界舞台上的点缀。     

末日拯救R计划 寻找恶灵之后

从天然井返回驻地没多久,杰克就破译了第一条密语。按照玛雅玉盘的指示,在神秘莫测的百慕大三角洲,有一种可怕的恶灵之石。传说,这些邪恶的石头被封印在大海深处,但它们一有机会就冲破层层枷锁,蹿上海面兴风作浪。可是,希格和波比在百慕大群岛上打听了一个     

The Bionic Anticipation of Natural Disasters

After major natural disasters, such as the recent earthquake-tsunami event in South Asia, reports appear about the mysterious ability of animals to anticipate and to escape the impending danger. This is an opportunity to recall the long history of this phenomenon in the traditions of different civilizations, to evaluate Chinese efforts, 30-40 years ago, to use this phenomenon for earthquake prediction, and to judge its state of acceptance in modem science. An effort is made to introduce this phenomenon as a research field of modem bionics. The timing is favorable since, increasingly, infrared thermal anomalies, monitored from satellite, suggesting litho-atmospheric processes, are found to precede earthquakes. They were unexpected by seismologists and are here suggested to essentially reflect the energy conversion patterns responsible for the signals monitored by animals. The aim is to learn from animals in the long term how natural disasters can better be anticipated, and how simple technical warning systems can be developed. Some challenges are analyzed. One is interpretation of the nature of energy release prior to the main earthquake disaster resulting in ＂macro-anomaly＂ precursors, another is better to understand the effect on animal senses. The role of non-linear cooperative phenomena including tsunamitype waves is emphasized.     

情系灾区 共渡难关——上海医疗器械行业与灾区人民心连心

2008年5月12日四川汶川地区发生8．0级特大灾害性地震后，上海医疗器械行业协会在第一时间内组织干部与职工积极投入赈灾捐款活动中。全体职工纷纷解囊捐款献出一份爱心。