美国2006～2010年拖拉机市场销售走势浅析

介绍了美国拖拉机的市场销售情况,分析了美国拖拉机市场特点及发展趋势。     

加强图书馆联合参考咨询系统的建设,促进文献资源的开发利用

本文简述了文献传递服务发展的基本过程,概括了联合参考咨询网服务模式与内容,对现阶段UCDRS存在的问题进行分析与探讨,提出了解决问题的方法及优化措施,积极整合各类图书馆信息资源和服务力量,促进公益性联合参考咨询系统的发展。     

中美森林法比较及其对我国森林法修改的启示

通过比较中美森林法的历史和现状，指出森林法修改和完善的紧迫性且时机已经成熟，以及森林法修改要重视理论研究和实际情况调查。我国森林法修改和完善可以借鉴美国森林法中的森林生态系统管理等先进理念。对美国《国有林管理法》与《中华人民共和国森林法》的结构与体例、立法精神、科学的地位、公众参与等内容进行了比较研究，据此给出一些《中华人民共和国森林法》的修改建议。     

集体林权流转主体若干问题研究——以福建集体林权制度改革为研究对象

在分析福建省实践中的林权流转主体范围的基础上,重点对主体之一的联户法律性质及其权利行使进行了探讨,并结合《物权法》的规定,指出林权证是确定林权主体资格的法律依据。     

我国林业CDM固C项目的前景、影响及相关对策

本文从林业的角度对《联合国关于气候变化的框架公约》，《京都议定书》的相关条款做了介绍，并对CDM（清洁发展机制)林业固C项目在我国开展的前景及影响做了分析。主要结论如下：1)CDM林业固C项目是我国林业发展的重大机遇，通过为林业争取国外资金、技术支持及促进生态效益补偿制度的建立，将有力促进我国林业展与生态建设。2)为了充分把握CDM林业固C项目的机会，需要对林业的固C总量及固C潜力，可纳入CDM的林业固C项目的类型与特征，合适的CDM固C造林技术及模式，C贮量测定的标准化以及CDM的运行机制等进行研究。3)建议通过国际合作研究培养相关人材，开展小规模的CDM固C项目试点，并通过相关部门积极申报CDM森林固C项目。     

Factors influencing stump sprouting by pondcypress (Taxodium distichum var. nutans (Ait.) Sweet)

Sprouting can be an important mechanism of regeneration in harvested cypress (Taxodium sp.) wetlands; however, limited information exists on factors influencing sprouting. We examined the influence of harvesting practices, tree size, and site conditions on stump sprouting in eight pondcypress (Taxodium distichum var. nutans (Ait.) Sweet) wetlands in Florida, USA. Stumps were cut at three heights: 20 cm below high water level, at high water, and 40 cm above high water. Half of each site was harvested using a sawhead feller and the other half using shearhead. We monitored sprouting for 2 years post-harvest. Stump height affected first year sprouting, but the effect disappeared during year 2. Felling equipment did not affect sprouting; however, the shearhead caused greater stump damage. Sprouting declined with increasing parent tree size; percentage of stumps with sprouts after 2 years was 68% for trees 10–14 cm dbh and 28% for trees 20–24 cm dbh. Stump sprouting ranged among sites from 23 to 54% after 2 years. Results indicate that sprouting may be an important, but inadequate, form of regeneration. At sites with short hydroperiods, dense understories, and/or predominance of trees greater than 20 cm dbh, reduced sprouting may occur, and planting seedlings may be beneficial.     

Comparative Phenotypic and Genotypic Analyses of Salmonella Rissen that Originated from Food Animals in Thailand and United States

Salmonella enterica serovar Rissen has been recognized as one of the most common serovar among humans and pork production systems in different parts of the world, especially Asia. In the United States, this serovar caused outbreaks but its epidemiologic significance remains unknown. The objectives of this study were to compare the phenotypic (antimicrobial susceptibility) and genotypic attributes of Salmonella Rissen isolated in Thailand (Thai) and the United States (US). All the Thai isolates (n = 30) were recovered from swine faecal samples. The US isolates (n = 35) were recovered from swine faecal samples (n = 29), cattle (n = 2), chicken (n = 2), dog (n = 1) and a ready‐to‐eat product (n = 1). The antimicrobial susceptibility of isolates was determined using the Kirby‐Bauer disk diffusion method with a panel of 12 antimicrobials. Pulse‐field gel electrophoresis (PFGE) was used to determine the genotypic diversity of isolates. All Thai isolates showed multidrug resistance (MDR) with the most frequent antibiotic resistance shown against ampicillin (100%), sulfisoxazole (96.7%), tetracycline (93.3%), streptomycin (90%) and chloramphenicol (30%). About half of the isolates of USA origin were pan‐susceptible and roughly 30% were resistant to only tetracycline (R‐type: Te). Salmonella Rissen isolated from Thailand and the USA in this study were found to be clonally unrelated. Genotypic analyses indicated that isolates were clustered primarily based on the geographic origin implying the limited clonality among the strains. Clonal relatedness among different host species within the same geography (USA) was found. We found genotypic similarity in Thai and US isolates in few instances but with no epidemiological link. Further studies to assess propensity for increased inter‐regional transmission and dissemination is warranted.     

美国花生生产概况与研究动态

 本文从花生种植简要历史,生产区域和花生类型,种植面积和产量,种植技术（包括播种、收获和病虫害防治）,花生消费和产品质量控制等方面介绍了美国花生生产的概况。通过对2010至2012年美国花生研究和教育协会举办的花生年会上文章的统计,简要分析了美国在花生种质资源与育种研究、花生遗传与生物技术,花生生产技术以及病虫害抗性等方面的研究动态,旨为我国花生的科研与生产提供参考。      

Soil Salinization in Some Irrigated Areas of the Kingdom of Bahrain

Monitoring and assessment of agricultural land degradation is of vital importance for better land and water management planning and reclamation. It requires setting baseline information and basic analysis at specific time and space. About 33 geo-referenced soil sampling spots were selected in two agricultural production locations in the Kingdom of Bahrain to assess the status and preliminary causes of land degradation. Soil samples were taken from 13 sites in Diraz location while 19 samples were taken from Budayyi location. The samples were taken to 90 cm depth at 30 cm intervals. Standard procedures were followed to determine soil physiochemical properties. In addition, field observations on farm condition, distance from the sea, method of irrigation and irrigation water source were taken. Some of the soil samples were deliberately taken from outside the irrigated basins among trees compared with samples taken from inside the actively growing area for comparison. The results indicated that the salinity level was significantly （P 〈 0.001） higher at the 0-30 cm soil depth compared with 30-60 cm or 60-90 cm depths in both locations. The distance from the sea did not show clear correlation with surface soil salinity in Budayyi area compared with Diraz. Both locations showed significantly higher salinity levels on samples taken outside the actively growing areas compared with those taken from within. The effect is more prominent at the 0-30 cm depth. The observed variability on salinity levels may be attributed to farm management practices and deteriorating quality of ground water. Thus, agricultural land degradation in Bahrain cannot be attributed to ground water deterioration alone. The use of tertiary treated sewage water （TSE） may ease the pressure on ground water, but the pH of the TSE should be carefully monitored and managed with proper studies on leaching requirements to avoid further salinity complications.