发挥县域农业资源优势 做大做强五大主导产业

贵州省思南县农业资源十分丰富,近年来狠抓了畜牧、茶叶、烤烟、经果林和蔬菜这五大产业.为了充分发挥县城农业资源优势,做大做强主导产业,重点对五大产业发展现状、存在的问题、有利条件、发展目标和对策措施进行了探索.     

贵州煤炭企业产业转型的后续产业选择

贵州煤炭企业在进行产业转型过程中,应根据所在地区的优势和企业自身的情况,选择具有可持续发展潜力的后续产业,以逐步摆脱对矿产资源的依赖,获得更好的发展空间,实现持续发展.在后续产业选择中必须对产业关联程度、需求收入弹性、可持续发展能力、区位因素等4个方面进行综合比较,同时还必须与区域经济发展阶段水平相适应,又要不脱离煤炭企业的实际.     

地方文献为区域文化旅游服务的思考

以阿拉尔市为例。新兴边疆城市阿拉尔市具有得天独厚的旅游资源,但也存在诸多现实问题,从发展文化旅游业视角充分发挥高校图书馆信息服务的优势,加强挖掘利用馆藏地理文献,为发展文化旅游提供理论依据,重视地方文献数字化建设,开展针对性的信息需求服务。     

Height development of Betula pubescens following precommercial thinning by breaking or cutting the treetops in different seasons

Topping, i.e. cutting or breaking the treetops of secondary stems, may be an attractive alternative to traditional precommercial thinning. The survival and height development of downy birch (Betula pubescens Ehrh.) after topping were examined over three growing seasons in two dense, naturally regenerated stands, 3.1–3.5 m high, in northern Sweden. The topping was performed in experiments with a two-factor randomized complete block design, as follows. Three treatments were applied to individual secondary stems (top-breaking at half the sample tree mean height, top-cutting at half the sample tree mean height, and traditional cutting just above ground) at each of three times: winter, spring and summer (in frozen, dormant and growing conditions, respectively). A control (no treatment) was also included. The survival rate was lowest for traditionally cut stems and for stems cut in growing conditions. Height development after three growing seasons was significantly affected by time of treatment, the height growth being lowest after treatment in growing conditions, but not by treatment. Height growth of control stems was not significantly different from height growth in any combination of treatment and time of treatment, after three growing seasons. However, control stems had the greatest leading shoot length in the third growing season.     

桔梗的“引经”作用对氟苯尼考药动学的影响

20只新西兰白兔随机均分成2组(A、B组),A组单剂量1次灌胃内服氟苯尼考30 mg/kg;B组氟苯尼考30mg/kg与桔梗煎液2 g/kg单荆量1次同时灌胃内服给药;采用高效液相色谱法测定血药浓度,血药浓度最低检测限为0.05 mg/L,以3p97药代动力学程序和SPSSl2.0统计分析软件对所得数据进行分析.结果,药-时数据均符合一级吸收一室开放模型(W=1/C2),主要药代动力学参数及拟合方程如下.A组:T1/2ka(0.461±0.066)h,T1/2kc(2.013±0.195)h,Tpeak(1.180±0.123)h,Cmax(7.332±1.000)mg/L,AUC(31.445±3.566)mg·h-1·L-1,V/F(2.995±0.330)L/kg,拟合方程为:C=19.833(e-0.396t-e-2.387t);B组;T1/2ka(0.550±0.112)h,T1/2ke(3.308±0.270)h,Tpeak(1.414±0.183)h,Cmax(4.737±0.360)mg·L-1,AUC(23.128±2.096)mg·h-1·L-1,V/F(1.400±0.127)L/kg,拟合方程为:C-11.021(e-0.342t-e-10860t).结果表明,桔梗与氟苯尼考同时灌胃内服后,桔梗的"引经"对氟苯尼考在家兔体内药物代谢有较大影响.     

Measuring and comparing constraints to improved biosecurity amongst GB farmers, veterinarians and the auxiliary industries

Constraints to the introduction of enhanced biosecurity systems are rarely considered in sufficient detail when population medicine specialists initiate new control schemes. The main objective of our research was to investigate and compare the different attitudes constraining improvement in biosecurity for cattle and sheep farmers, practising veterinary surgeons and the auxiliary industries in Great Britain (GB). This study was carried out utilizing farmer focus groups, a questionnaire survey of veterinary practitioners and a telephone survey of auxiliary industry representatives. It appears that farmers and veterinarians have their own relatively clear definitions for biosecurity in relation to some major diseases threatening GB agriculture. Overall, farmers believe that other stakeholders, such as the government, should make a greater contribution towards biosecurity within GB. Conversely, veterinary practitioners saw their clients’ ability or willingness to invest in biosecurity measures as a major constraint. Veterinary practitioners also felt that there was need for additional proof of efficacy and/or the potential economic benefits of proposed farm biosecurity practices better demonstrated. Auxiliary industries, in general, were not certain of their role in biosecurity although study participants highlighted zoonoses as part of the issue and offered that most of the constraints operated at farm level.     

生态型现代农业是新疆农业的发展方向

本文在分析了新疆发展生态型现代农业的优势和制约因素的基础上,提出新疆要走"绿色环境、特色产业、国际精品、高效经济"的生态型现代农业发展道路;从生态型现代农业的发展规划、节水和用水供给、现代农业示范与农产品出口基地建设、农业结构调整、现代农业服务体系建设方面,提出了加快新疆发展生态型现代农业的对策和建议.     

新农村建设中提高政策支持效应、优化企业与农户合作行为分析——以贵州省W村为例

采用实地研究和调查研究方法,对贵州山区新农村建设中龙头企业与农户合作行为进行研究,分析合作行为现状与原因,提出加快合作组织建设、完善项目管理等措施,以探寻政府、企业和农户个人等利益相关方多方共赢的合作形式,进而促进区域农村经济社会发展。     

中华猕猴桃在中国种植适宜性区划

中华猕猴桃(Actinidia chinensis)原产于中国,是我国主栽猕猴桃品种之一,由于其较高的经济价值,近年来种植规模呈逐步扩大趋势。本文利用MaxEnt模型,基于气候因子和物种分布记录,分析中华猕猴桃在中国的种植适宜性区划,采用刀切法(Jackknife test)筛选主导气候因子及其适宜值。基于筛选的气候因子10次重复的AUC平均值为0.960,表明MaxEnt模拟中华猕猴桃在中国潜在分布的准确性极好,其在中国的适生区为25°N~36°N, 101°E~122°E,高适生区包括四川、陕西、重庆、湖北、贵州、浙江、湖南、安徽、河南、江苏和甘肃等省份;中适生区则以高适生区为中心向外扩散,包括河南、湖北、安徽、江苏和山东等地。限制中华猕猴桃地理分布的关键气候因子为最冷季度平均温度、4月最高温度、10月最低温度、5月份平均温度、5月份平均雨量、平均日较差等。研究结果可为中华猕猴桃种植区划提供理论参考。