费县许家崖水库大银鱼现状及对策

费县许多岸水库于１９９２年移植大银鱼，１９９３年形成种群，捕捞产量４．５ｔ，１９９４年达３０．４ｔ。但１９９５、１９９６年产量逐渐查研究，找出减产原因，并提出相应对策。     

林木生物质原料收集半径分析——以景谷县生物质发电项目为例

结合景谷县生物质发电项目特点,以翔实的调查数据为依据,以成本的经济性为基点,通过分析原料供求现状、估算原料收集成本,构建原料收集成本与收集半径的关系模型,科学地确定了项目的原料收集半径,以期为项目投资运营的可行性提供科学依据。     

通辽市玉米生产现状及发展策略

简要介绍了通辽市玉米生产概况,分析了玉米生产潜力和影响玉米生产稳定发展的主要问题。提出了促进通辽市玉米生产优质高效发展的主要对策。     

云南省云县农机监理工作存在问题与对策

文章通过对云南省云县当前农机监理工作中存在问题的分析,探讨今后一个时期,面对当前农村农业的新形势,云县农机安全监理工作应该采取的对策和措施。     

武威地区中药生态农业发展现状与建议

武威地区开展中药生态农业研究具有非常重要的生态效益、经济价值和社会效益,为促进武威地区中药材产业的高质量发展和开展中药生态农业研究提供理论依据。对武威市现有中药材种质资源、生态栽培技术以及中药生态农业的发展现状进行了分析,提出了把中药生态产业作为武威市乡村振兴的主导产业、聚焦产业开展多学科联合攻关、开启“中药景观生态农业”发展模式、推进中药材种子种苗生态栽培基地建设、强化GAP规范化生产管理和中药材种植生态化等适宜武威市中药生态农业发展的建议。     

天祝县鸡产业发展现状及前景对策分析

鸡产业作为天祝县八大产业之一,资源环境优越,生产效益稳定,市场潜力大。坚持龙头企业打造引领,科学规划养殖布局,落实工作措施,可有力推动全县畜牧业高质量发展,持续巩固拓展脱贫攻坚成果,加快乡村振兴步伐。     

黄土丘陵区天然侧柏种群结构特征及生存状况

[目的] 探究黄土丘陵区天然侧柏种群结构特征及生存状况,为该区森林草地高质量可持续发展提供科学依据。[方法] 基于遥感影像选择10 000 m²典型样地为研究区,利用每木检尺法调查采集数据;采用时间代替空间、匀滑技术等方法在静态生命表的基础上利用动态变化指数量化分析数量特征,结合时间尺度上的谱分析及时间序列模拟预测,对侧柏种群进行综合生存分析。[结果] ①侧柏种群的高度、冠幅和径级结构均表明幼树丰富。②侧柏种群存活曲线近Deevey-Ⅱ型,种群对外界干扰有敏感度。③种群动态表现为前期生存能力强,中期生长稳定,后期生命衰退的特点。时间序列模拟和预测分析说明侧柏种群个体呈不同程度的增加趋势且具较强生长恢复能力。[结论] 黄土丘陵区天然侧柏种群结构稳定且呈增长趋势,存活曲线接近Deevey-Ⅱ型。     

陕西辣椒产业现状·问题与发展对策

本文概述了陕西制干线辣椒产业中的发展现状、存在问题,以及持续发展的对策。     

Park and neighbourhood environmental characteristics associated with park-based physical activity among children in a high-density city

Constructing and renovating urban parks is an effective strategy for high-density cities to satisfy residents’ needs for recreation in nature. Using Hong Kong as an example of a high-density city, the purpose of this study was to examine the associations of park and neighbourhood environments with park-based physical activity (PA) among children and examine the moderating effect of neighbourhood income in their relationships. A cross-sectional study was conducted in 32 urban parks in Hong Kong. Park-based PA and the park and neighbourhood environments were measured using systematic observation tools and the geographic information system. Neighbourhood income was extracted from the 2011 Hong Kong Population Census data on median household income. A total of 7,753 children were observed using urban parks for PA during the study. Children’s park-based PA was positively associated with the quality of supporting amenities, park safety, neighbourhood walkability, and neighbourhood quality, while the associations of park-based PA with the diversity of active facilities and park size were not significant. In addition, neighbourhood income moderated the associations of park-based PA with the diversity of active facilities, the quality of supporting amenities, neighbourhood walkability, and neighbourhood quality. These findings provide empirical evidence on the moderating role of neighbourhood socioeconomic status on the associations between park and neighbourhood environments and children’s park-based PA in a high-density city. With children’s needs for using parks for PA, our findings are beneficial for urban planners to renovate existing urban parks to enhance their utility for children living in high-density cities.     

马铃薯渣饲用研究进展及应用前景分析

马铃薯淀粉渣富含养分、成本低、产量高,是良好的饲料来源.文章分析马铃薯的饲用价值,从青贮和发酵两方面综述马铃薯渣的饲用化研究现状,并提出马铃薯渣饲用潜力开发的主要制约因素,展望其饲用化的应用前景,为马铃薯渣的饲用化研究提供参考.