不同基质处理对淡水浇灌桐花树成苗率及幼苗生长的影响

为探索桐花树的淡水化人工培育技术以及筛选适宜的基质,以塘泥、黄心土、河沙和椰糠为试验材料,通过不同的配比组合成10种混配基质,并进行育苗试验,对桐花树的成苗率以及生长情况进行研究。结果发现,不同的混配基质对桐花树的成苗率、苗高、地径、根系生长、鲜重和干重等指标有明显的影响,其中以基质F（30%塘泥+50%黄心土+10%河沙+10%椰糠）综合得分最高,其平均苗高、地径、主根长、一级侧根数、全株生物量、成苗率分别比综合得分最低的基质高24.3%、11.1%、6.3%、6.5%、37.5%、2.0%。     

哈尔滨农民回迁居住区户外景观设计模式初探

回迁居住区是城市化推进的产物之一。回迁居民在这里的生活模式和物质环境都与其本来状态存在许多矛盾与冲突,使得回迁者常出现“回而不适”现象,对农民生活、心理产生极大负面影响。文章以哈尔滨市城郊失地失宅农民为研究对象,通过对哈尔滨市现有回迁居住区进行实地调研,总结出农民回迁者审美的特异性和行为活动需求及农民回迁居住区户外空间环境存在的主要问题,最后提出满足于哈尔滨失地失宅农民审美情趣及行为需求的农民回迁居住区户外空间设计策略,让农民回迁者有一定的家园感与归属感。     

鳗鲡卵黄蛋白的生物效应

鳗鲡卵黄蛋白制备物与血清在SDS-聚丙烯酰胺凝胶电泳上分别呈现出2条相对应的蛋白区带,迁移率(R_f)相同。对照组雌鳗经5次和7次注射HCG与CPG后,成熟系数(GSI)分别为(11.94±2.83)%和(46.04±6.22)%,血清中17β-雌二醇(17β-E_2)浓度为(0.665±0.431)ng/ml和(0.421±0.010)ng/ml,睾酮(T)为(4.603±3.442)ng/ml和(3.817±1.399)ng/ml,经HCG.CPG与鳗鲡卵黄蛋白三者混合注射5次和7次后,GSI分别为(16.53±6.67)%和(53.23±11.25)%,血清中17β-E_2浓度为(1.036±0.316)ng/ml和(0.411±0.068)ng/ml,T为(11.170±5.818)ng/ml和(3.956±1.780)ng/ml。未经注射催情药物的雌鳗GSI为(0.50±0.32)%,血清中17β-E_2和T浓度低,检测不出。试验结果证明,外源性鳗鲡卵黄蛋白与HCG和CPG三者混合注射具有明显的促进鳗鲡卵巢加速发育成熟的作用。     

生长点点滴法在筛选鉴定转基因植株中的应用

对转化体 (种子或幼苗 )筛选的培养基筛选法和生长点点滴筛选法进行了比较分析。结果表明 ,在 4d苗龄的转化芥菜幼苗生长点点滴 80 0 mg/L 的潮霉素 ,获得了转基因植株 ,PCR检测结果表明 ,两种筛选方法的筛选结果一致。生长点点滴法的优点是 ,转基因幼苗不易污染 ,且成活率高。     

整板结构的古筝共鸣面板振动模态的研究

[目的]古筝的演奏效果除了与演奏者的技艺有关,与古筝本身的结构也有密不可分的联系.其中共鸣面板接收琴弦的振动并引起共振发声,是古筝发声过程中至关重要的一部分.本研究以整板结构古筝共鸣面板为研究对象,利用不同分析方法探讨其声学振动性能.[方法]采用ZSDASP信号采集分析软件对整板结构共鸣面板进行实验模态分析,得出各阶次...     

Explaining urban governance in the midst of political transformation: The city of Macao

This paper takes a close look at the urban governance and political culture of Macao, the world largest casino city. Macao has experienced spectacular economic growth since gaming liberalisation in 2002 and China's Free Individual Travel scheme launched in 2003. However, the booming gaming sector has crowded out other sectors of Macao. It has not only made the city's economy mono‐structured and consequently extremely vulnerable to external shocks and fluctuations but also induced serious social divisions and political controversies within the local community. By tracing the root cause of the ongoing dilemma and crisis in the mode of governance, the dynamic relationships between formal and informal institutions, consensus politics and the social group culture are intensively discussed in a historical context. In fact, the sustainable development of the former Portuguese colony has largely been hindered by its residents' passive attitudes toward political communication, non‐transparent urban governance, the absence of a middle class and the dominance of pro‐establishment social groups.     

甘蔗生态农业

本文分甘蔗生态育种、甘蔗生态栽培和甘蔗生态病虫害综合治理等方面进行论述。甘蔗生态育种主要是利用甘蔗叶型（长短、宽狭、厚薄和旗叶）、株型（幼苗株型和成长株型）、茎型（紧密直立和疏散斜生）、根型（浅根和深根）等形态特征和生长习性育成生产上所需求的优异生态良种，如早封行良种能抗旱和抗咸，迟封行良种有利于种植间套作物，群体透光度高的良种其高产高糖后代机率高于透光度低的．自动脱叶及茎直立的良种适于甘蔗机械化栽培管理。甘蔗生态栽培包括地膜覆盖、化学除草等生态栽培技术措施，使甘蔗生长在一个人为创造的生态条件下，保温、保湿、保土、保肥有利于高产高糖高效益。甘蔗生态病虫害综合治理主要是利用生物防治、农业防治、生态防治和有限度的农药防治等来获得长效、高效、低残、低毒、低污染和低成本的防治病虫害效果。     

Growth and leaf chemistry of Atriplex species from Northern Mexico as affected by salt stress

Atriplex species are tolerant to salinity and water stress and thus they are suitable for restoration of many degraded ecosystems. In addition, many Atriplex species offer good value as forages. We compared growth and leaf chemistry of Atriplex canescens, a well-known halophyte, and A. acanthocarpa, a poorly-studied species, as affected by salinity in a greenhouse study. Seeds and soil were collected in northern Mexico, the native range of these species. Plants were grown in pots containing native soil and irrigated with NaCl solutions of 0, 50, and 100 mM. Shoot growth of A. canescens declined 37% as NaCl treatments increased from 0 to 100 mM while shoot growth of A acanthocarpa was not significantly affected by salinity. The high salt tolerance of A. acanthocarpa was linked to a high accumulation of leaf sodium (Na) (7- to 13-fold higher than A. canescens). A. acanthocarpa had also higher growth rate than A. canescenes, making the former species a good candidate for cultivation, especially under saline conditions. Tissue concentration of potassium (K) in both species was minimally affected by the salinity treatments. Leaf nitrogen (N) concentration increased as plants faced higher salinity treatments, especially in A. canescens. The high salt tolerance and higher Na accumulation of A. acanthocarpa make this species an attractive choice for reclamation of saline areas. We suggest A. acanthocarpa should be explored as viable forage for cultivation and for reclamation of degraded areas just as A. canescens has been throughout the world.     

关于林业产业演进的理论探讨

在阐述产业及产业演进涵义的基础上, 界定林业产业及林业产业演进的涵义, 分析林业产业概念的演化过程, 从产业生命周期的视角采用定性分析与定量分析相结合的方法, 探讨林业产业演进的评价标准和测度方法, 并提出从要素、技术、需求、制度、政策5方面构建林业产业演进的支撑体系。