年轻群体在公共绿地中的活动参与度调查——以上海浦东新区部分公园为例     

蔡伟勇  罗震伟 《安徽农业科学》2016,(12)

公共绿地作为开放空间,公众可以共享自然环境及社会资源。而当下公共绿地中不同群体的参与度存在较大差异,尤其是年轻群体参与度低。笔者以上海浦东新区部分公共绿地中年轻群体活动参与度为研究对象,从年轻群体的低参与度、活动意愿及管理者角度等方面,分析了年轻群体低参与度的原因,认为原因主要是年轻群体缺乏业余时间、绿地可达距离较远、活动内容缺乏等。在调查基础上,从活动载体、信息渠道、服务方式等方面提出建议,主张公共绿地管理者转变服务理念、开拓有益活动、建立信息平台、优化空间资源,以提高社会服务效能。  相似文献   

红三叶多酚氧化酶特性的研究   总被引：1，自引：0，他引：1  

王晶  周禾 《草地学报》2007,15(2):142-144,163

红三叶(Trifolium pretense L.)多酚氧化酶仅作用于邻苯酚,与对苯酚、间苯酚和一元酚无作用,而且对不同的邻苯酚其活性也表现很大差异,其中以咖啡酸作底物时活性最大.红三叶多酚氧化酶反应的最适pH值为6.5～7.0,最适温度为25～30℃,50℃时热稳定性相对较好.  相似文献   

防御酶活性、木质素和总酚含量与 辣椒抗黄瓜花叶病毒的关系     

SHL@cau.edu.cn 《中国农学通报》2006,22(5):369-369

（1中国农业大学农学与生物技术学院蔬菜系，北京 100094； 2山东省烟台农业学校，烟台 264002）  相似文献   

THE INFLUENCE OF HUMAN BEING ON THE DESERTIFICATION OF ORDOS AND THE POSSIBLE COUNTERMEASURES IN THE FUTURE     

《干旱区资源与环境》1993,(Z1)

<正> The Ordos Plateau is a unified geographical region demarcated by the Yellow River's elbow section on the north and the Great Wall on the south, administratively comprisingthe whole Ih-Ju League of Inner Mongolia, part of Yulin Prefecture of Shaanxi Province,and part of Yanchi County of Ningxia. The unique sandy and denuded landscape of the pla-  相似文献   

内皮生长晕细胞冻存和复苏的可行性     

林以诺张怀勤  黄伟剑肖方毅 余华 《勤云标准版测试》2007,15(11):819-822

目的研究冻存对内皮生长晕细胞增殖能力和成血管能力的影响,探讨内皮生长晕细胞冻存和复苏的可行性。方法分离脐血中单个核细胞,采用贴壁培养法培养扩增内皮生长晕细胞,免疫组织化学染色和荧光染色法鉴定其内皮细胞特性。扩增后的细胞采用浓度为650μmol/L(体积比为50mL/L)和1040μmol/L(体积比为80mL/L)二甲基亚砜的培养基冻存至液氮中,24h后复苏并观察冻存细胞的复苏率、复苏后细胞的增殖能力和成血管能力的改变。结果采用贴壁法培养的细胞具有多种内皮细胞特性。细胞采用含不同浓度二甲基亚砜(50mL/L和80mL/L)的培养基冻存后,其复苏率差异无统计学意义,细胞的增殖能力在复苏后36h内50mL/L、80mL/L二甲基亚砜组均较未冻存组减弱(P<0.05),72h后三组间比较差异无统计学意义。而复苏后6h内成血管速率较未冻存组减弱(P<0.05),但30h后三组间比较差异无统计学意义。结论内皮生长晕细胞可以进行冻存和复苏。  相似文献   

Reconstructing 100-150 years of logging history in coastal spruce forest (Picea abies) with special conservation values in central Norway     

《Scandinavian Journal of Forest Research》2012,27(6):591-604

Coastal spruce forests of central Norway harbour a unique assemblage of epiphytic lichens and are given high priority with respect to conservation of biodiversity. To assess the historical impact of logging during the last 100-150 yrs, 31 remnant stands were studied by means of tree-ring analysis of 2199 trees and the decay stage of 1605 stumps. No stands had been clear-cut, but all had been selectively logged at least twice during the last 150 yrs. Total harvested timber volume ranged from 65 to 409 m³ha-¹ (31-124% of present-day standing volume) and the selective logging kept standing volume low (40-200 m³ha-¹) during 1890-1930. Present-day stand characteristics were strongly correlated with site productivity and topographic position within the ravine valleys. Low amounts of dead wood at sites with high historical logging activity was the only consistent relationship found after covariance of site productivity, topographic position and deciduous trees were taken into account. The results indicate that old-growth stand characteristics, such as reversed J-shaped age distributions and dead wood in advanced decay classes, can be obtained 100-150 yrs after intensive selective logging.  相似文献   

两种植物粗提物对桃蚜的杀虫活性研究     

谢晋伟  刘素琪  李友莲  张利军 《山西农业大学学报(自然科学版)》2007,27(4):387-389

本试验主要以桃蚜为研究对象,通过喷雾法和浸渍法,进行河朔芫花氯仿提取物和地肤甲醇提取物对桃蚜杀虫作用的初步研究。获得结果为河朔芫花氯仿提取物使用喷雾法时24 h的致死中浓度为375.65 mg/L,使用浸渍法时24 h的致死中浓度为218.04 mg/L;地肤甲醇提取物用喷雾法时24 h致死中浓度为382.21 mg/L,浸渍法时24 h致死中浓度为303.21 mg/L。  相似文献   

Clinical Guide to Obesity and Nonherbal Nutraceuticals in Canine Orthopedic Conditions     

《Veterinary Clinics of North America: Small Animal Practice》2022,52(4):939-958

  相似文献   

Does streptobacillary arthritis reduce house mouse population density,activity and damage to sorghum crops?     

Shahram Kaboodvandpour  Luke K.-P. Leung 《Journal of pest science》2007,80(3):167-174

An experiment to examine the effect of streptobacillary arthritis on mouse populations was conducted in maturing sorghum crops in mouse-proofed pens. There were three treatment pens and three control pens in which mice with and without clinical signs of streptobacillary arthritis were introduced, respectively. A constant mouse density (533 mice ha⁻¹) was introduced to the pens by releasing 12 mice in each pen. The sex ratio of introduced mice was also constant by releasing in each pen nine males and three females. Mean track index was lower in treatment pens than in control pens, indicating that streptobacillary arthritis reduced the activity of mice. However, this was not translated into a reduction in other population responses. Mean mouse density at harvest, percentage of female pregnant at harvest, yield loss caused by mice and a feeding index (oil card index) did not differ significantly between treatment and control groups. A plausible explanation for these findings was that mice with the clinical signs might be less active but were able to consume as much grains as mice without the clinical signs because food was in abundant supply.  相似文献   

花尾榛鸡(Bonasa bonasia)在韩国温带林中的季节性移动特征(英文)     

Shin-Jae Rhim  Woo-Shin LEE 《林业研究》2002,13(2)

This study were carried out in the Experimental Forest (37( 48' 10" N, 127( 48' 50" E) of Gangwon Forest Development Institute, Gamjeong-ri, Chuncheon, Gangwon-do Province, Korea from Dec. 1999 to Jul. 2002. Eight individuals (three males and five females) of hazel grouse were captured and they were marked with a 14-g necklace-type transmitter. The surveying results showed that females were more active than males throughout the year, but males were more mobile than females in spring. The degree of movement for females and males was similar from summer to winter. The overlap degree of habitat was very large from spring to autumn. Hazel grouse had greater shifts in area use in winter. They used similar area from spring to autumn, made a shift in their habitat use in winter, and then shifted back to the previous habitat.  相似文献