1,076 research outputs found
三种湿地植物抗寒性的初步研究
在阶段性降温条件下,研究了三种常用湿地植物黄鸢尾(Iris pseudacorus L.)、花菖蒲(Iris ensata Thunb.)及水芹(Oenabthe javanica)叶片抗寒性相关生理指标(可溶性蛋白质含量、可溶性糖含量、游离脯氨酸含量、丙二醛含量、超氧化物歧化酶活性、过氧化物酶活性、过氧化氢酶活性以及细胞质膜相对透性)的变化。结果表明,冷锻炼使湿地植物通过对抗氧化酶活性及渗透性的调节来提高其机体的抗寒性。低温条件下,黄鸢尾的抗氧化酶活性显著增加,5℃时SOD活性是初始值的5.77倍;花菖蒲保持较高的CAT活性,5℃时其CAT活性是黄鸢尾CAT活性的8.95倍,是水芹CAT活性的3.77倍;水芹叶片中脯氨酸含量明显提高,温度和脯氨酸含量呈负相关(R=-0.755,P=0.050)。综合比较各项生理指标可以得到这三种湿地植物的耐寒性大小顺序依次为:黄鸢尾>花菖蒲>水芹
Propagated error analysis of digital elevation models generated by bi-cubic hermite interpolation methods
2013-2014 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishe
Research on Changes of Traditional Rural Settlement from The Perspective of Villagers——Take Zhangjiao Village in Quanzhou as an Example
伴随着全球化、现代化和城市化的不断发展,我国许多传统村落都遭受到了严重的破坏,传统建筑荒废、破坏现象严重。乡村聚落大量新建筑营建,传统的地域特色逐渐消失。对于传统的乡村聚落而言,如何保护老建筑,如何调节新旧之间的矛盾以及如何改善村民生活质量是当下亟待解决的问题。本文主要内容是以村民主体为视角来研究乡村聚落的变迁过程,并尝试提出应对策略,为传统乡村聚落的保护及更新提供思路。 本文选取福建省十余个乡村聚落作为研究样本,探究其普遍特征,并以福建省泉州市樟脚村作为主要研究对象,以村民视角探索村落变迁过程。樟脚村被评为“福建省传统村落”“福建省历史文化名村”,村落内有一片保存完好传统村落区域,其余地区...With the continuous development of globalization, modernization and urbanization, many traditional rural settlements in China have suffered serious damage. A large number of new dwellings are built, the traditional regional characteristics gradually disappeared. For the traditional rural settlements, how to protect old dwellings, how to adjust the contradictions between old and new and how to impr...学位:建筑学硕士院系专业:建筑与土木工程学院_建筑学硕士学号:2522014115176
The Efficiency of Low-Quality Roughage Utilization on Ruminants: Researches on its Metabolic Mechanism
岐阜大学(Gifu University)博士(農学)博士論文 (Doctoral dissertation)doctoral thesi
Research Progress on Hybrid Solar-Geothermal Power Generation
Developing and using combined new energy sources is an important direction of development for new energy in future. The first Hybrid Solar-Geothermal Power station has been built, and related research on this field has been carried out vigorously. Accord
The Econometric Analysis and Countermeasures Choice of Resident's Consumption Behavior in China
摘要 消费、投资和净出口被誉为拉动经济增长的“三驾马车”。其中,消费是经济发展的原动力。当前,我国城乡居民消费倾向偏低,居民消费结构升级受阻,消费增长难以持续,扩大国内居民消费需求己成为推动国民经济持续、健康发展的决定性因素。因此,研究转型经济中的我国居民消费行为,掌握其变化的规律性与特异性,提出引导居民消费的适宜政策,对于实现新一轮国民经济的可持续增长具有十分重要的意义。 本论文的主要研究方法和研究内容总结如下: (1)我国城乡居民消费水平和消费结构的研究。首先,通过采用误差修正模型(ECM)对城乡居民收入与消费之间的关系进行实证分析,试图发现城镇和乡村居民各自收入和消费之间是否存在着...Abstract Consumption, investment and net exports are the troika for economic growth. Among them, the consumption is deemed to the driving force for economic development. Currently, there exist some problems in the country's economic life,which are as follows: the low consumption tendency of Chinese urban and rural residents, the residents' consumption structure upgrade is obstructed and consumpti...学位:经济学博士院系专业:经济学院计划统计系_统计学学号:1542008015026
绿色GDP核算统计指标体系的构建
绿色gdP体系的理论和核算方法是近几年研究经济和环境协调发展的热点,其对于促进经济、社会、环境的可持续发展具有重要作用。文章从绿色gdP的概念和内涵入手,分析了现行gdP核算方法存在的问题;提出了建立绿色gdP核算指标体系的原则;构建出了绿色gdP核算统计指标体系
- …
