四川地震资源与开发研究

界定了地震旅游资源的概念,用灾害经济学观点、旅游规划理论和系统方法分析了"5.12"汶川特大地震派生的地震旅游资源,提出了地震旅游产品开发原则和总体思路,并就龙门山断裂带整个区域地震旅游产品开发的协调互补与整合给出了框架性建议。     

Beneficial effects of glycine on growth and leaf nutrient concentrations of coriander (Coriandrum sativum) plants

Abstract

In this study, the effect of glycine amino acid was evaluated on growth characteristics and nutrient uptake of coriander plants under greenhouse conditions. The treatments were soil application of glycine in two concentrations of 300 and 600?mg kg^?1 soil, foliar application of glycine (in 0.05% concentration), soil application of mix NPK fertilizer and no fertilizer control. The growth parameters of plant height, leaf SPAD value, shoot and root fresh weights were significantly improved by soil application of glycine, particularly in higher concentration. Soil application of glycine also reduced the number of flowered plants, while it increased soluble solids (TSS) and vitamin C of plant leaf extracts than control plants. Leaf nutrient concentrations of nitrogen (N), calcium (Ca), potassium (K), phosphorus (P), iron (Fe), and zinc (Zn), but not magnesium (Mg) and manganese (Mn), were significantly increased by soil application of glycine, whereas soil applied NPK significantly increased P and Ca of leaves than unfertilized control plants.     

Iron transport in plants: Future research in view of a plant nutritionist and a molecular biologist

Iron is attractive to plant physiologists since J. Sachs has proven in 1868 the essentiality and the possible leaf uptake of Fe. It lasted about 100 years before the principal processes for Fe mobilization in the rhizosphere were discovered and classified as two distinct strategies for Fe acquisition. During the 80's and 90's of the last century the uptake of Fe²⁺ and Fe^III-phytosiderophores by specific transporters in strategy I- and strategy II-plants, respectively, were postulated without any application of the new approaching molecular techniques. In the following decade, the various transporters for Fe uptake by roots, such as AtIRT1 in Arabidopsis or ZmYS1 in maize and their possible regulation were characterized. In the following years with fast developing molecular approaches further Fe trans ortsrs were genetically described with often only vague physiological functions. In view of a plant nutritionist, besides uptake processes by roots, the following transport processes within the respective target tissue have to be considered by molecular biologists in more detail: 1) radial transfer of Fe from the root cortex through the endodermis, 2) xylem loading in roots, 3) transfer of Fe from xylem to phloem via transfer cells, 4) phloem loading with Fe in source leaves and retranslocation to sink organs, and 5) remobilization and retranslocation via the phloem during senescence of perennial plants. The importance of these various specific transport processes for a well-regulated Fe homeostasis in plants and new strategies to identify and characterize proteins involved in Fe transport and homeostasis will be discussed.     

汶川地震灾区归一化植被指数变化监测分析

提取归一化植被指数合成旬最大植被指数,研究地震重灾区域的植被状况.结果表明:1)盆地西部和北部山区,植被在4月下旬到5月底呈现自然生长规律,并且存在一条以旬最大植被指数为标记的稳定边界线来区分盆西山区和盆地农田;2)2008年地震前期,4月下旬的旬最大植被指数好于5月上旬,地震发生的5月中旬,旬最大植被指数在成都平原、德阳和阿坝州交界的山区明显减小,5月下旬,大部分区域旬最大植被指数都在减小;3)2009年5月中旬的旬最大植被指数是最好的,5月下旬,盆地中的旬最大植被指数值减小;4)地震使得在盆西山区和盆地农田之间通过旬最大植被指数表征的稳定边界被破坏.     

考虑杆件缺陷单层网壳动力稳定分析

网壳结构的动力稳定分析是空间结构研究的重要课题之一,目前在网壳结构动力稳定分析中大多没有考虑杆件缺陷对结构动力稳定性能的影响。本研究在考虑节点初始几何缺陷的基础上,采用多段梁法形成初始弯曲来模拟杆件初始缺陷,并以K8型单层球面网壳为例系统分析了在三向地震作用下考虑杆件缺陷的单层球面网壳结构动力稳定特性,以及杆件缺陷对网壳结构整体稳定性的影响。结果表明:考虑杆件缺陷的网壳会较大降低结构的稳定承载力,其中单元的精细划分影响显著。     

彭州市龙门山不同地震裸地次生演替初期土壤酶活性研究

地震形成的次生裸地的生态恢复包括植被和土壤的结构与功能恢复两个方面.选取彭州龙门山地震崩塌地、泥石流冲积扇、滑坡体等震后形成的三个典型次生裸地恢复3 a后,对表土(0-30 cm)有机碳、水溶性氮、有效磷和土壤酶活性等性质进行了研究,以评价恢复初期不同次生裸地的土壤恢复状况.结果显示,自然恢复3a,土壤有机碳恢复到原生样地的27％～42％,可溶性碳恢复至原生样地的25％～46％,可溶性氮恢复至原生样地的6％～14％,有效磷恢复至原生样地的21％～83％.土壤酶中,过氧化氢酶活性恢复较快,达到对照样地过氧化氢酶活性的70％以上,而脲酶、蔗糖酶、碱性磷酸酶活性恢复较慢,分别为对照样地的5％～19％,6％～48％,6％～26％,因此地震形成的次生裸地上土壤肥力质量与土壤酶活性的恢复是一个长期的过程.     

以灾后重建推进四川农业产业化进程

分析了四川省农业产业化的现状和存在问题,就汶川地震对农业造成的损失进行了分析,并提出了重建过程中加快农业产业化进程的对策。     

山东民房抗震设防问题探讨

随着农村经济水平和生活水平的提高,农村新建农房呈现出高、大、空的特点,本文针对这一特点,在调查研究的基础上,按《建筑抗震设计规范》(文中简称抗震规范)(GB50011—2001)对新建民宅存在的抗震能力差等问题进行了研究,并提出了改进的措施,以期提高农村住宅的抗震防灾水平。     

震后相关医学流行病学研究论文计量分析

以SCIE数据库为数据源,对国际上地震后相关医学流行病学研究作者发文量、期刊分布、被引频次等进行统计分析,为我国震后医学流行病学研究提供参考。

     

地震与泥石流活动

地震激发泥石流的形成与活动,一方面造成严重的水土流失,同时,给人类造成巨大灾害.研究地震对泥石流的形成、活动及预报是极为重要的.