Relationships between landcover proportion and indices of landscape spatial pattern

Recent studies have related percolation theory and critical phenomena to the spatial pattern of landscapes. We generated simulated landscapes of forest and non-forest landcover to investigate the relationship between the proportion of forest (P_i) and indices of patch spatial pattern. One set of landscapes was generated by randomly assigning each pixel independently of other pixels, and a second set was generated by randomly assigning rectilinear clumps of pixels. Indices of spatial pattern were calculated and plotted against P_i. The random-clump landscapes were also compared with real agricultural landscapes. The results support the use of percolation models as neutral models in landscape ecology, and the performance of the indices studied with these neutral models can be used to help interpret those indices calculated for real landscapes.     

矢量汉字库的结构剖析和二次开发方法研究

通过剖析一套单线体矢量字库的存储结构，分析了矢量字库的基本制作过程，对矢量字库二次开发方法进行了探讨和研究，并具体编程实现，分析方法简单实用。     

德国牧羊犬生理生化指标及血清FT_3、FT_4水平

对 2月龄至 9岁德国牧羊犬生理生化指标及血清 FT3 、FT4的测定结果表明 :WBC,幼年组 (2～ 4月龄 )较低 ,成年组 (1～ 2岁 )最高 ,老年组 (7～ 9岁 )明显下降 ;RBC,老年组较其他年龄段组稍低 ;RDW表明 ,幼年组红细胞体积较其他年龄段组稍大 ;RL T,老年组较其他年龄段组稍低 ;TP、Alb,幼年组及老年组较低 ;AST,幼年组最低 ,为 (2 7.6 5±8.2 4) U/ L,而老年组最高 ,为 (36 .17± 8.47) U/ L;AL T,幼年组最低 ,为 (19.6 3± 7.2 1) U/ L,而老年组升高至(37.6 1± 11.6 5 ) U/ L;FT3 、FT4,幼年组最高 ,分别为 (116 .15± 19.6 3) μg/ L、(2 990 .17± 34 0 .6 0 ) μg/ L,进入老年期FT4下降至 (1180 .15± 46 0 .2 3)μg/ L     

膨化工艺对乳仔猪日粮养分及生长性能的影响

采用相同配方的膨化颗粒料和普通颗粒料进行哺乳仔猪和断乳仔猪日粮常规营养成分、氨基酸含量、细菌数量、脲酶活性、物理性状分析和乳仔猪生长饲养试验。结果表明 :两种制粒工艺的常规营养成分间差异不显著 :氨基酸总量、必需氨基酸和非必需氨基酸含量膨化料的比普通颗粒料高6.67 %～7.59 % ,差异不显著(P>0.05) ;两种饲料的卫生学和感官指标符合GB13278 -91 ,但膨化料的总细菌和大肠杆菌最可能数少于普通料 ,差异不显著(P>0.05) ;乳仔猪两料中的脲酶活性 ,膨化颗粒料比普通料分别降低56.25 %和28.57 % ,但差异不显著(P>0.05) ;膨化料与普通料相比 ,硬度明显增加 ,其中 ,哺乳仔猪料间差异显著(P<0.05) ,断乳仔猪料间差异极显著(P<0.01) ;膨化料与普通料相比 ,淀粉糊化度哺乳仔猪和断乳仔猪料分别提高32.86 %(P<0.05)和45.45 %(P<0.01)。饲养试验 ,膨化料育成率为96.77 % ,70日龄窝重203.76kg ,窝均盈利1040.83元 ,分别比普通料提高3.85 %(P>0.05)、13.01 %(P>0.05)和36.48 %(P<0.05)。     

毛刺科（Trichodoridae）线虫分类概况 Ⅱ. 属种鉴定和种的名录

 概述了毛刺科及毛刺属（Trichodorus Cobb, 1913）,拟毛刺属（Paratrichodorus Siddiqi, 1974）,单毛刺属（Monotrichodorus Andrassy, 1976）和异毛刺属（Allotrichodorus Rodriguez-M, Sher &; Siddiqi, 1978）鉴别特征,列出迄今已描述的94种1亚种和1裸名种的名录。     

稻纵卷叶螟危害损失与防治指标研究

稻纵卷叶螟对水稻危害损失及防治指标的研究结果表明 ,水稻功能叶受害后 ,造成的产量损失 ,粳稻品种大于杂交籼稻 ;千粒重损失及空秕率和产量损失率呈显著正相关。不同叶位受害对经济产量的影响 ,总趋势是由上而下依次递减 ,水稻植株各器官存在着一定的经济补偿力。淮北稻区稻纵卷叶螟的防治指标 ,初步定为粳稻百丛 30～ 40头 ,杂交籼稻百丛 40～ 5 0头。经大面积示范、推广证实 ,这一防治指标能有效地控制稻纵卷叶螟的危害 ,农药费用可节省 30～ 75元 /hm2 ,挽回稻谷损失一成左右。药剂防治次数减少 2～ 3次 ,节省用工费 15～ 45元 /hm2 ,并降低了稻谷内的农药残留量 ,减少了环境污染 ,净化了农田生态系统 ,经济效益明显     

Growth Analysis, Herbage and Seed Yield of Certain Forage Legume Species Under Rainfed Conditions

The need to increase forage production for the growing livestock population in the Mediterranean region necessitates the evaluation of various promising forage species with respect to maximum herbage yield, optimum time for harvest and seed yield. Seven forage legumes, woolly pod vetch ( Vicia villosa subsp. dasycarpa accession 683), narbon vetch (V. narbonensis accession 67), common vetch ( V. sativa selections 2541, 2037, 2020), common chickling ( Lathyrus sativus selection 439) and ochrus chickling ( L. ochrus selection 104) were compared over two years with contrasting rainfall. In both years the entries were sown in November and their primary growths sampled periodically during growth. For each sample, phenology, total dry matter, leaf area index (LAI) and, at maturity, total dry matter, seed yield and harvest index, were recorded.
In both seasons, narbon vetch attained the highest dry matter and seed yields, and there was very limited variability in the maximum dry matter yield of the other entries. In general, the maximum dry matter occurred at 20–50 % podding in woolly pod vetch, 100 % podding in common vetch selection 2541 (local), narbon vetch and common chickling and at maturity in common vetch selection 2037, selection 2020 and ochrus chickling.
Throughout the vegetative to early flowering stages, woolly pod vetch had the highest dry matter yield and LAI. Possible uses of each species as animal feed are discussed.     

5种杉科植物不同部位的精气成分

为了解杉科植物所含精气的化学成分及其相对含量,在湖南南岳、江西靖安、浙江临安选择柳杉、杉木、水杉、池杉和落羽杉5个树种的纯林采集各树种的叶片和木材释放的精气,采用气相色谱/质谱联机法分析、鉴定其所含化学成分及其相对含量.结果表明:杉科植物所含主要化学成分是α-蒎烯、β-蒎烯、莰烯,柳杉的叶片和木材单萜烯、倍半萜烯相对含量之和分别达96.89%、98.84%;杉木的叶片和木材所含单萜烯与倍半萜烯相对含量之和分别达95.60%、96.34%;水杉的叶片和木材单萜烯、倍半萜烯相对含量之和分别达99.03%、97.69%;池杉的叶片和木材所含单萜烯与倍半萜烯相对含量之和分别达98.83%、94.91%;落羽杉的叶片和木材所含单萜烯、倍半萜烯相对含量之和分别达95.77%、96.71%.     

美国长木公园的植物配置

长木公园是美国首屈一指的观赏性公园,其精巧而独具特色的植物配置形成了秀美的景观,展示了该公园精湛的园艺水平。     

高职高专女生生殖健康状况调查

目的通过对在校女生生殖健康基本状况的调查和存在问题的原因分析,为学生搞好生殖健康提供帮助。方法采用问卷法对信阳职业技术学院护理专业730名女生进行调查,重点收集她们入学3年来的生殖健康情况资料。结果痛经、月经紊乱患病率为38%,白带异常年患病率为59%,且多数学生不知如何处理,更没有得到有效治疗。结论在校女生生殖健康状况堪忧,学校及有关部门应高度重视,采取措施保障她们的生殖健康。