金融改革背景下加快农地流转问题探析

新的金融体制改革让更多民间投资主体进入金融业,减小了银行存贷款利差,优化了资源配置,进而增加农村基础设施投入,促进农业社会化服务体系建设,加速土地集中,从侧面加快了农村土地流转。     

城市不同植物群落在小尺度范围内降温增湿效应的时空变化

城市中植物群落的降温增湿作用是缓解城市热岛效应的有效途径。选择江西财经大学麦庐园校区的乔木林、灌木丛和草坪为研究对象,对3者在小尺度范围内调节城市小气候的效应进行了定量化研究。结果表明:(1)乔木林的降温效应最明显出现在20:00(-4.00℃),最弱是在10:00(-1.68℃);灌木丛降温效应最明显出现在8:00(-2.95℃),最弱是在12:00(-0.27℃);草坪影响下的降温效应最明显出现在20:00(-2.31℃),最弱是在10:00(0.38℃);(2)上午时段灌木丛的降温效应明显,灌木丛和草坪增湿效应明显;下午时段草坪降温效应变化幅度大,乔木林在下午时段增湿效应的变化幅度大;(3)乔木林、灌木丛和草坪的降温效应和增湿效应都随距离的增大而减少,温度差值和相对湿度差值在水平和垂直方向上的变化趋势基本一致。     

基于需求视角的农村公共产品供给机制研究——以宁夏回族自治区为例

公共产品的有效供给是推进新农村建设的关键环节,中国农村公共产品的需求增长较快,但供给严重不足且结构失衡、供需脱节的局面严重阻碍了农村社会的正常发展。从需求的视角来探讨如何有效地构建公共产品供给机制,对宁夏农村公共产品的需求态势、供给现状进行了阐述,进而提出了完善需求导向的农村公共产品供求均衡机制的思路及相应的政策建议。     

农村劳动力转移与制度创新

系统地分析了农村劳动力转移过程中的农业劳动与非农劳动并行供给策略的必然性及其不足之处,提出了农村土地使用权安排最低层次原理,并利用它论证了土地制度创新的必要性,而土地制度创新的前提条件是建立和健全农村社会保障制度,只有通过制度化的农村社会保障替代传统的土地保障功能,实现规模化经营,才能从根本上摆脱农村贫困现象。     

解构当代设计中材质语言

现代社会艺术的多元化发展趋势，决定了作为载体的装饰材料的广泛扩展，众多的艺术家开始寻找和发掘各种原始材料或新科技成果带来的现代材料，质感肌理的艺术语言成为现代艺术中十分重要的造型要素。     

锌在固始鸡不同组织器官中沉积量的动态研究

用原子吸收分光光度计法对固始鸡0,2,4,6和8周龄时各组织器官(胸肌、腿肌、肝脏、肾脏、心脏、胰脏、胫骨、趾骨、跖骨、法氏囊)的锌沉积量进行了测定。结果表明:(1)心脏中锌沉积量随周龄变化差异不显著(P>0.05);肝脏中锌沉积量随周龄变化差异显著(P<0.05);肾脏、胰脏、法氏囊、胸肌、腿肌、胫骨、跖骨、趾骨中锌沉积量随周龄变化差异极显著(P<0.01)。(2)2周龄之后,锌在骨骼、胰脏、法氏囊中沉积量较高,在肌肉中沉积量较低,其中在胸肌中沉积量最低,明显低于其他组织器官。(3)法氏囊、胸肌、肾脏、胰脏中锌沉积量随周龄的增加逐渐减小,且差异极显著(P<0.01);腿肌、肝脏、心脏、胫骨、趾骨、跖骨中锌沉积量在0～4周逐渐上升,4～6周有下降趋势,但变化规律不明显。     

Bringing Southeast Asia to the Southeast United States: New forms of alternative agriculture in Homestead,Florida

Immigrant farmers from Southeast Asia have brought knowledge of tropical fruit and vegetable production from their home countries to Homestead, Florida. They have developed a new style of farming, one that most closely resembles agricultural systems described as “homegardens.” Although biodiverse agricultural systems are generally thought to be commercially unviable, homegarden farmers successfully manage crop diversity as an economic strategy. By focusing on growing a mixture of specialty Southeast Asian herbs, fruits, and vegetables, the farmers have created their own economic niche and have shielded themselves from the competition of high-volume, single commodity producers. This paper shows that the Homestead homegardens constitute an alternative form of agriculture that is defined by their agroecological and socioeconomic attributes. It also shows that although the homegarden farms are a form of “alternative agriculture,” they do not operate outside of conventional, global systems of agricultural trade; rather the homegarden farms are embedded in global agriculture. The Homestead case problematizes the tendency to delineate between the global and local scales, and alternative and conventional sectors in agriculture today. This paper concludes that the emergence of the Homestead homegardens can only be understood by taking a place-based approach to studying the environment in which the homegardens are situated as well as identifying the large-scale influences on Miami-Dade County. Valerie Imbruce holds a PhD in plant sciences from a joint program between the Graduate Center of the City University of New York and the New York Botanical Garden. She has conducted research on global agricultural systems in New York City, south Florida, and Central Honduras.     

Identification and transfer of a new cytoplasmic male sterility source from Oryza perennis into indica rice (O. sativa)

Summary Most of the commercial hybrids of indica rice are based on wild abortive (WA) source of cytoplasmic-genetic male sterility (CMS). Such cytoplasmic uniformity may lead to genetic vulnerability to disease and insect pests. To overcome this problem, diversification of CMS sources is essential. Crosses of 46 accessions of O. perennis and two accessions of O. rufipogon as female parents were made with two restorers (IR54, IR64) of WA cytosterility. Sterile hybrids were backcrossed with the respective recurrent parents. Of all the backcross derivatives, one line having the cytoplasm of O. perennis Acc 104823 and the nuclear background of IR64 was found to be stable for male sterility. The newly developed CMS line has been designated as IR66707A. This line is completely sterile (0% seed set) under selfed conditions. Crosses of IR66707A with 10 restorers of WA cytoplasm showed almost complete (93–100%) pollen sterility, indicating that the male sterility source of IR66707A is different from WA sterility. Southern hybridization of IR66707A, O. perennis (cytoplasmic donor), IR66707B (maintainer) and V20A (WA cytoplasm) using mitochondrial DNA specific probes (5 endonucleases × 8 probes) showed identical banding patterns between IR66707A and O. perennis. However, in more than half of the combinations, different banding patterns were observed between IR66707A and IR66707B and between IR66707A and V20A. The results suggest that IR66707A has the same cytoplasm as the donor (O. perennis), and CMS may not be caused by any major rearrangement or modification of mtDNA. The new CMS source identified will be useful in cytoplasmic diversification in hybrid rice breeding.     

营造多元化的高校校园建筑交往空间——以长江大学13号教学楼设计为例

高等教育理念的发展促使校园交往活动呈现多元化的趋势。从高校教学楼内部交往活动的多元化特点和多元化行为方式的分析入手,通过对长江大学13号教学楼内部空间的体验和对其建筑语言的解读,就如何营造多元化的校园建筑交往空间进行针对性地探讨。     

国际农村空间多元化研究的知识图谱分析

伴随着发达国家\