Edaphic factors determining variation of two ecotypes of Leymus chinensis in North China

To identify ecotypic variation of L. chinensis, the physiological characteristics and environmental factors were measured and assessed for grey-green and yellow-green ecotypes of L. chinensis grown in the salt-alkalized and aeolian sandy soils. Although both ecotypes presented a similar salt-alkaline tolerance under the experimental conditions, they differed in several aspects. The L. chinensis grown in the aeolian sandy soils had higher water potential and chlorophyll content and lower proline content in their leaves than those grown in the salt-alkalized habitat, and the grey-green ecotype of L. chinensis in both types of soils had higher water potential, chlorophyll and proline contents than the yellow-green ecotype. Besides, grey-green ecotypes had higher salt-alkaline tolerance than the yellow-green ecotype. The stepwise regression analysis showed that soil conductance and pH value were the main ecological factors affecting the physiology of L. chinensis. From the natural distribution of the two ecotypes, we considered that salt-alkaline in the soils is the leading factor in determining ecotypic variation of L. chinensis. The two ecotypes were first named grey-green and yellow-green ecotypes respectively.     

从生态视角重读《猎人笔记》

从自然生态优化人性生态和爱惜、保护自然生态两个层面探讨作品的生态意蕴 ,并认为《猎人笔记》是俄罗斯文学中第一部富有生态意蕴的小说。     

河北和谐社会建设中的生态责任与生态整体观

生态批评在文艺美学研究中属于比较前沿的领域。生态责任与生态整体观是生态批评的重要原则。生态批评对现实的介入性,使得将这两个概念引入"河北和谐社会建设"这一论题成为可能。建设和谐社会从根本上说是建立一种生态文明型的社会。河北和谐社会建设,应在生态整体观的指导下认真履行生态责任。这种责任就政府而言,体现为决策层应转变发展理念并落实在相关的制度与管理层面,使其具备可操作性;就公民个体而言,应逐步建立起生态伦理意识,在日常生活中养成环保生活习惯。     

不同生态型蜈蚣草对砷富集的差异及其机理

 土壤砷污染是全球尤其是东南亚和中国非常突出且亟需解决的环境问题。自砷超富集植物--蜈蚣草（Pteris vittata L.）发现以来,一直是国内外学者研究的一个热点。深入理解蜈蚣草体内砷代谢和富集机制是有效利用植物修复技术治理砷污染土壤的关键。在长期的自然进化过程中,蜈蚣草逐渐分化出不同生态型。已有研究结果显示：不同生态型蜈蚣草在砷富集和砷耐性等方面均存在明显差异。本文在系统分析蜈蚣草砷富集特征、机理的基础上,重点阐述了生态型差异对蜈蚣草砷富集的影响方面的最新研究进展。研究结果显示：非污染生态型与污染生态型蜈蚣草相比砷富集能力更为高效,说明通过选择性的利用合适的蜈蚣草生态型将明显改善植物修复的效率。不同生态型蜈蚣草砷富集与砷耐性差异的分子机理尚不清楚,相关关键功能基因及其过程尚需深入研究。     

生态城市的理论与实践思考

以城市可持续发展为出发点，分析了城市环境意识及发展历程，论述了现代生态城市的理论意义与构建框架。按生态城市的建设要求，从城市植被、选址与布局、住宅建筑、产业、政治、文化等诸方面进行了研究和探讨。     

磁场对互花米草(Spartina alterniflora)三种生态型的生理效应

磁场对互花米草具有显著的生理影响,通过三种生态型互花米草在芽、苗期过氧化物酶(POD)、细胞色素氧化酶(COD)、苹果酸脱氢酶(MDH)、酯酶(Esterase)等同工酶、游离氨基酸和种子发芽状况的分析,表明四种同工酶、氨基酸代谢和种子萌发明显受磁场的影响。不同的植物发育期,磁场影响不相同;四种同工酶对磁场的感应强度并不相同,磁场作用具有阈值,特定的磁场强度具有特定的生物效应,而不同的生态型,磁场阈值不同,故基因型不同是磁场生物效应差异的一个重要因素,在磁场诱变育种等生产实践和其他有关研究中应注意基因型的差异。     

Genetic diversity, geographic differentiation and evolutionary relationship among ecotypes of Glycine max and G. soja in China

The knowledge of origin and evolution of cultivated soybeans is one of the basic issues in both biology and agronomy of the crop. In order to investigate the nuclear and cytoplasmic genetic diversity, geographic differentiation and genetic relationship among geographic ecotypes of cultivated （Glycine max） and wild （G. soja） soybeans, the allelic profiles at 60 nuclear simple-sequence repeat （nuSSR） loci and 11 chloroplastic SSR （cpSSR） loci evenly distributed on whole genome of 393 landraces and 196 wild accessions from nation-wide growing areas in China were analyzed. （i） The genetic diversity of the wild soybean was obviously larger than that of the cultivated soybean, with their nuSSR and cpSSR alleles as 1067 vs. 980 and 57 vs 44, respectively. Of the 980 nuclear alleles detected in the cultivated soybean, 377 new ones （38.5%） emerged, while of the 44 chloroplastic alleles in the cultivated soybean, seven new ones （15.9%） emerged after domestication. （ii） Among the cultivated geographic ecotypes, those from southern China, including South-Central China, Southwest China and South China possessed relatively great genetic diversity than those from northern China, while among the wild geographic ecotypes, the Middle and Lower Changjiang Valleys wild ecotype showed the highest genetic diversity. （iii） The analysis of molecular variance, association analysis between geographic grouping and molecular marker clustering and analysis of specific-present alleles of ecotypes demonstrated that the geographic differentiation of both cultivated and wild soybeans associated with their genetic differentiation, or in other words, had their relevant genetic bases. （iv） The cluster analysis of all accessions clearly showed that the wild accessions from Middle and Lower Changjiang Valleys and South-Central ＆ Southwest China had relatively small genetic distances with all cultivated accessions. The UPGMA dendrogram among geographic ecotypes further showed that the genetic distances between all cultivated ecotypes and the Middle and Lower Changjiang Valleys wild ecotype were smaller than those with other wild ones, including their local wild counterparts. Therefore, it is inferred that the wild ancestors in southern China, especially those from Middle and Lower Changjiang Valleys might be the common ancestor of all the cultivated soybeans.     

火电站能量系统绿色热经济及优化分析

分析了火电站能量热力系统 （锅炉热力系、汽轮机热力系） 的能源经济效率（Yong经济效率）,并从绿色生态保护角度出发,分析了火电站的生态效率计算模型.以系统绿色Yong经济运行系数入手分析,以发电成本最低为依据,建立了火电站能量系统的绿色Yong经济运行系数的优化表达式.最后以部件优化追加投资效益为研究对象,从而确立了需要改进的部件及其改进所得的综合效益函数.     

循环经济与生态产业发展中的生态政治问题研究

循环经济的发展与生态产业体系的建设有着密切的联系,但是,这一问题的提出及其后来的发展与研究中均存在一定误区,在我国,循环经济与生态产业的发展中忽略了对生态政治、政府作用发挥的研究,关于科学发展观“五个统筹”的认识中缺少对生态文明的关注,使我们在此方面面临比发达国家更大的局限。解决问题的关键是,树立“生态可续型社会”、可持续发展社会的发展观;确立环境价值观念,明确环境价值的数量关系,在经济发展中计量环境成本;注重发挥生态政治的不可替代的作用。     

沈阳大学新校区规划设计方案探讨

在新校区整体规划设计中,充分体现新的高校教学理念,展示开放式校园模式,坚持“以人为本”的设计方针,尽可能地为服务主体提供舒适、宁静、和谐、智能的环境,最大限度地实现新校区的园林化、生态化,打造一个绿色校园,生态校园．