桂东南特色文化资源数据库建设探析     

胡可东 《农业图书情报学刊》2011,23(9):26-29

特色数据库的建设是高校图书馆数字资源建设的一个重要组成部分，它是数字图书馆开展个性化信息服务最主要的信息资源。以玉林师范学院“桂东南特色文化资源数据库”的建设为例，希望通过对我馆在建库选题、数据的收集、加工、整理、发布和桂东南特色文化资源数据库体系框架等方面的具体阐述．为相关院校建设特色数据库提供参考。  相似文献   

以农业信息化推进山西特色农业发展   总被引：1，自引：0，他引：1  

段亚利 《农业图书情报学刊》2011,23(3):5-7

叙述了山西特色农业在＂十二五＂经济转型时期的特殊地位和作用,并详细分析了现状,提出农业信息化在推进山西特色农业发展的重要性及采取的措施。  相似文献   

浙江风水林类型、特点及保护管理探讨   总被引：1，自引：1，他引：0  

罗旋  王小德  杭璐璐  陈婧婧 《福建林业科技》2012,39(2):173-177

浙江风水林主要包括村落风水林、坟园墓地风水林、寺庙风水林等3种基本类型。阐述了浙江风水林的历史发展过程及浙江先民对风水林的保护管理,总结了浙江风水林的类型及基本特点,并提出风水林的保护管理对策。  相似文献   

李子栽培分析探讨     

陈军飞 《北京农业》2012,(12):39-40

做好李子的栽培,为农民增收,做好特色经济林的发展开辟新的路子。  相似文献   

Floristic diversity and vegetation patterns along disturbance gradient in arid coasts in southern Mediterranean: Case of the Gulf of Gabès,southern Tunisia     

Mohamed Neji  Mohamed Moncef Serbaji  Olivier Hardy  Mohamed Chaieb 《Arid Land Research and Management》2018,32(3):291-315

Knowledge about vegetation patterns along disturbance gradients is essential for conservation and management of coastal habitats in arid regions. This study focuses on the floristic diversity and the factors controlling the vegetation structure in the Gulf of Gabès (Tunisia). For this purpose, the floristic diversity of 120 relevés belonging to three coastal sites with different disturbance levels (40 relevés per site) was analyzed in relation with 10 environmental and anthropogenic factors. Therophytes constitute 54% of the 237 plants species belonging to 44 families identified in the present study. The species richness and floristic diversity indices exhibited a similar trend and peaked in the slightly disturbed site (H′?=?3.38; S?=?176). The similarity between sites was relatively low and reached its maximum between the little and the highly disturbed sites. Two-way indicator species analysis and detrended correspondence analysis applied on the floristic data resulted in groups mainly determined by disturbance level by explicitly segregating the three sites. Canonical correspondence analysis (CCA) indicated that the spatial pattern of species composition was mainly influenced by anthropogenic variables. Partial CCA revealed that the effect of anthropogenic variables on floristic composition was thrice higher than the effect of environmental variables (57.5% vs. 18.4%, respectively). Overall, this study provides a broad understanding of the floristic diversity and vascular plant richness in the Gulf of Gabès. The obtained results reflected a disturbance–diversity pattern and thus revealed the obvious importance of maintaining the intermediate disturbance for biodiversity conservation and monitoring.  相似文献   

高职院校思想政治理论课“双五步”案例教学法特点和功能分析     

陈东旭 《吉林农业科技学院学报》2013,(3):81-84

思想政治理论课在培养高端技能型人才方面具有不可替代的作用,在高职院校思想政治理论课中推行“双五步案例教学法”,对激发学生学习的积极性和主动性方面收到了事半功倍的效果.“双五步”案例教学法强调以学生为中心、以问题为轴心、以能力为核心；强调全过程、全覆盖、全五动.“双五步”案例教学法具有教育功能、桥梁功能和拓展功能,有待进一步总结、完善和提升.  相似文献   

克里雅河流域沉积物的粒度特征   总被引：1，自引：0，他引：1  

吉启慧 《干旱区研究》1992,9(3):48-56

克里雅河流域由普鲁至米萨来,冲积沙粒径向细递减;沙丘沙一般粗于下伏沙,而冲、洪积下伏地层上的沙丘风成沙则细于下伏沙;高大沙丘粒级组合主要受就近沙源影响。用累计百分数和粒级的φ值作图,求得φ_1、φ_5、φ_(16)、φ_(25)、φ_(50)、φ_(75)、φ_(84)、φ_(95)等8个数值,输入计算机获得最大粒径、中值粒径、平均粒径(M_z)、标准离差(σ_1)、偏度(S_(K1))、峰态(K_G)等值。  相似文献   

28个草地早熟禾品种坪用性状评价   总被引：3，自引：1，他引：2  

孙建华  王彦荣  柴琦 《草业科学》2003,20(12):18-21

对来自荷兰百绿、美国及丹麦的草地早熟禾28个品种的坪用质量性状进行了研究和评价。单项测定结果表明：各品种质量性状之间存在极显著差异或可明显区分出不同类型。其中,密度最高为Limousine和Elysee(1.45枝条数／cm2),次之为Cynthia(1.02枝条数／cm2);盖度最高为Monoply(87．1％),其次为Wembley(75．0％);质地测定中叶片最窄为Elysee和Limousine(分别为2．57mm和2．74mm),Compact位居第二;生长习性测定结果百绿品种占据半直立型(Julia)、半匍匐型(Sydspor)及中等3种类型,美国和丹麦品种仅有中等类型;颜色测定百绿品种呈浅绿、中绿、深绿3种类型,丹麦和美国品种分别为中绿和深绿、浅绿和中绿2种类型;冬末枯黄表征测定中表现轻微枯黄的品种仅有百绿品种Entopper,其余品种表现为中或重;青绿期最长的品种Fylking(336d)和较长品种Balin,Bar 5649,Conni,Entopper,Monoply(333d)均为百绿品种。依据对密度、盖度、质地、颜色、冬末枯黄表征及青绿期6个主要性状测定值的加权平均进行品种质量性状的聚类分析,认为可将28个品种分为密集纤细型、中等型和稀疏粗糙型3种类型,百绿品种在各类型中均有代表品种。  相似文献   

Comparative diagnostic test characteristics of oscillometric and Doppler ultrasonographic methods in the detection of systolic hypertension in dogs     

Stepien RL  Rapoport GS  Henik RA  Wenholz L  Thomas CB 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2003,17(1):65-72

Comparison of test characteristics allows a clinician to choose the optimal diagnostic test method for an individual patient. This study assessed the comparative test characteristics of noninvasive (NI) blood pressure measurement methods (oscillometric and Doppler) and used this information to develop optimal cutoff values for diagnosis of systolic hypertension in dogs by these NI methods. Simultaneous NI (oscillometric or Doppler methods) and invasive (arterial puncture [AP]) systolic blood pressure (SBP) measurements were obtained prospectively from normal dogs and dogs suspected of having systemic hypertension based on clinical signs. Oscillometric SBP readings were obtained from the distal hind limb (Osc-L, n = 54) or the proximal tail (T. n = 27). Doppler BP measurements were obtained using a forelimb cuff (n = 57). AP-SBP was categorized as hypertensive if > or = 160 mmHg, and sensitivity (Se). specificity (Sp), and likelihood ratios (LR) were calculated for diagnostic cutoff values ranging from 130 to 220 mmHg. Receiver operator characteristic (ROC) curves were analyzed to determine optimal cutoff values for diagnosis of AP-SBP > or = 160 mmHg. Optimal NI SBP cutoff values considered to reflect AP values > or = 160 mmHg were: Osc-L = 160 mmHg (Se: 65%, Sp: 85%. LR = 4.33: 1), Osc-T = 150 mmHg (Se: 84%, Sp: 75%, LR = 3.36: 1), and Doppler = 160 mmHg (Se: 71%,  相似文献   

半干旱黄土丘陵区小流域横断面土壤水分生态特征   总被引：9，自引：0，他引：9  

刘文兆  胡梦珺  侯喜禄  李凤民 《干旱地区农业研究》2003,21(4):95-100

在半干旱地区甘肃榆中北部中连川流域取一横断面,根据地形部位与利用条件布设11个测点,用土钻法监测土壤水分剖面分布与动态,测深到5m。各立地条件年内4月到12月土壤水分动态趋势多样。流域横断面的土壤湿度均较低,2～5m平均值一般都小于10％,其中以坡地苜蓿与半阳坡柠条林地最干燥。该地区土壤干燥化层是普遍存在的,不仅存在于人工植被,也存在于天然植被。径流富集叠加可显著改善土壤水分状况,隔坡水平梯田是其重要途径。退耕还草中要考虑各类草地的比例、苜蓿种植的适宜规模及其持续性问题。  相似文献