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以四川、湖南、河南、山东4省农户调查为基础,从生产要素匹配、大田经济产出、农民收入提高、农村社会
发展4个准则层构建指标体系,采用改进TOPSIS法,对样本区大田生产服务提供绩效进行评价,并运用灰色关联
度模型进行影响因素分析.结果显示:大田生产服务提供绩效值与4省大田生产发展水平、服务水平基本一致,并
在4省之间及各省内部表现出较大的区域差异.从影响因素分析来看,大田经济产出和农民收入提高对绩效的影响
程度较高;生产要素匹配和农村社会发展对绩效的影响程度较低.最后,根据评价和分析结果指出提高大田生产服
务提供绩效的路径. 相似文献
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以四川省、湖南省、河南省、山东省4省问卷调查为基础,从市场风险、管理风险、环境风险和要素风险4个方面构建大田生产服务提供风险评价指标体系,采用模糊综合评价法,对样本区大田生产服务提供风险进行评价.结果显示:南方的四川省、湖南省风险指数分别为3.227和3.197,提供主体面临着较高风险;北方的河南省、山东省风险指数分别为2.895和2.789,提供主体面临的风险水平也相对较低.在4种风险类型中,大田生产服务提供面临的最主要风险是要素风险,其次是环境风险和市场风险,影响最小的是管理风险.最后,从微观和宏观两个层面提出大田生产服务提供风险化解的对策. 相似文献
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利用黑龙江、吉林、辽宁和内蒙古4省(区)农村微型企业实际调查数据,构建"创业者社会网络—资源获取—创业绩效"递进理论模型,运用结构方程模型方法,分析并探讨创业者社会网络、资源获取对农村微型企业创业绩效影响机理。结果表明,宽泛的创业者社会网络有利于企业获得多元化创业资源进而转化为农村微型企业创业绩效;个人网络对资产型资源获取能力高于知识型资源获取,商业网络对知识型资源获取能力高于资源型资源获取;资产型资源对农村微型企业生存绩效和创新绩效有显著促进作用,对成长绩效影响不显著;知识型资源对农村微型企业成长绩效和创新绩效有显著的促进作用,对生存绩效影响不显著,且对创新绩效的影响程度高于成长绩效。政策导向应注重个人网络对农村微型企业资源获取的基础作用,提升商业网络引致效果,保证创业资源与创业绩效"匹配"转化。 相似文献
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卢红 《新农村(黑龙江)》2014,(14):46-47
农村经济是影响农民收入的重要因素,大力发展农村经济,才能促使农民收入的提升,让农村人们享受到更加优越的生产生活条件,不断提高农村人口生活质量。文章就农村经济发展对提高农民收入的影响问题进行如下探讨。 相似文献
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在社会经济快速发展的背景下,城市化进程也逐步完成,在这种情况下我国开始发展农村经济。但是随着而来的问题就是城乡经济具有越来越大的差距,如何有效的提高农民收入是社会共同关注的话题。农业产业化的发展对农民收入的提高具有较大的影响,给农村产业结构的调整提供了重要的理论基础,从而有效的促进农村产业的发展。基于此,本文详细的分析了农业产业化对农民收入产生的影响,并提出了农业产业化促进农民收入增长的有效对策。 相似文献
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基于经济增长视角,从农业投入水平、农业产出水平、农村经济及可持续发展水平3个层面入手,采用道格拉斯生产函数和灰色关联分析方法,对新疆现代农业发展的影响因素进行分析.结果表明:在投入水平因素中,单位耕地面积农机总动力影响程度最大;在产出水平因素中,土地产出率影响最大;在农村经济及可持续发展水平因素中,农村居民家庭拥有农业生产性固定资产原值、农民人均收入水平影响程度较大.根据以上结论提出相关建议,为新疆现代农业发展提供参考. 相似文献
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Segregation of form, color, movement, and depth: anatomy, physiology, and perception 总被引:63,自引:0,他引:63
Anatomical and physiological observations in monkeys indicate that the primate visual system consists of several separate and independent subdivisions that analyze different aspects of the same retinal image: cells in cortical visual areas 1 and 2 and higher visual areas are segregated into three interdigitating subdivisions that differ in their selectivity for color, stereopsis, movement, and orientation. The pathways selective for form and color seem to be derived mainly from the parvocellular geniculate subdivisions, the depth- and movement-selective components from the magnocellular. At lower levels, in the retina and in the geniculate, cells in these two subdivisions differ in their color selectivity, contrast sensitivity, temporal properties, and spatial resolution. These major differences in the properties of cells at lower levels in each of the subdivisions led to the prediction that different visual functions, such as color, depth, movement, and form perception, should exhibit corresponding differences. Human perceptual experiments are remarkably consistent with these predictions. Moreover, perceptual experiments can be designed to ask which subdivisions of the system are responsible for particular visual abilities, such as figure/ground discrimination or perception of depth from perspective or relative movement--functions that might be difficult to deduce from single-cell response properties. 相似文献
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The primary rocks are a sequence of titanium-rich basic volcanics, composed of clinopyroxene, plagioclase, and ilmenite with minor olivine, troilite, and native iron. The soil and microbreccias are respectively loose and compacted mixtures of fragments and aggregates of similar rocks, minerals, and glassy fragments and spheres. Impact events are reflected by the presence of shock metamorphosed rock fragments, breccias, and glasses and their resulting compaction to form complex breccias, glass-spattered surfaces, and numerous glass-lined craters. Chemistry of the glasses formed by the impact events is highly variable, and the high iron and nickel content of a few moundlike features suggests that at least some of the projectiles are iron and nickel-rich meteorites. 相似文献
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通过野外调查、标本采集、分类学研究及资料考证,基本摸清了贵州樟科、莲叶桐科、景天科、堇菜科、柳叶菜科、鹿蹄草科、柿科、山矾科、木犀科等9个科药用植物资源的种类与地理分布.结果发现贵州现有樟科药用植物49种4变种,莲叶桐科药用植物5种,景天科药用植物21种,堇菜科药用植物19种1变种,柳叶菜科药用植物20种4变种,鹿蹄草科药用植物7种1变种,柿科药用植物9种1变种,山矾科药用植物12种,木犀科药用植物30种3变种.其中,4种为贵州特有药用植物,40种5变种为贵州药用新资源. 相似文献
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重金属Pb、Cr、Cd对烟草生长的影响及其分布规律 总被引:1,自引:0,他引:1
[目的]研究重金属Pb、Cr、Cd对烟草的生理作用及其在烟草中的吸收累积规律.[方法]采用盆栽试验方法,测定烟草根、茎、叶等器官中Pb、Cr、Cd含量,分析不同重金属污染程度下烟草的株高及叶片干物质重的变化.[结果]重金属处理的土壤中烟草的株高都显著低于对照,呈现抑制作用,添加外源Pb和Cr处理下,烟草叶片干重随添加浓度的升高而降低,Cd处理则呈现出先升高后降低的趋势.Pb、Cr、Cd重金属在烟草器官中的含量均为根>茎>叶,根系中Pb、Cr、Cd的浓度与添加浓度具有较好的相关性,而叶片中只有Cd含量与添加浓度具有较好的相关性.[结论]烟草植株中的重金属主要来源于土壤,烟草对重金属的传输过程具有一定的滞阻作用. 相似文献
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Neoliberalism, neoconservatism, and spaces of and for coalition 总被引:1,自引:0,他引:1
Alan P. Rudy 《Agriculture and Human Values》2006,23(4):423-425
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GONG Yi-feng LIAO He-rong WANG Jin-fu LI Hong-yan 《中国农业科学(英文版)》2006,5(4):318-322
A corn-soybean meal diet (CSB) (or Diet 1) containing 23% crude protein (CP) was used as the positive control, and another corn-soybean meal diet containing 21% CP and 15% wheat middlings (WM) (or Diet 2) was used as the basal diet, which was treated with four different treatments. Digestibility experiment was employed to discuss the collective effect of citric acid, and intrinsic and microbial phytase. By comparing and analyzing effects of them in the low-nutrient broiler diets, the results showed five treatments had similar effects on Tibia ash (%) (mg) (P〉0.05). Under the supplementation of bacterial phytase or citric acid, the daily body weight gain (ADG), gain:feed (G:F) ratio, and calcium (Ca) utilization were similar to that of standard-nutrient CSB diet (Diet 1) (P 〉 0.05). And, fecal phosphorus (P) and CP utilization were lower than (P〈0.05) that of Diet 1. But P utilization was significantly higher than (P〈0.01) that of Diet 1. However, the ADG, G:F, and CP utilization produced by supplementation of intrinsic phytase were lower than those of Diet 1, but other aspects were similar to those produced by Diet 1 (P〉0.05). In Diet 5, citric acid, intrinsic and bacterial phytase were added to the diet, which produced a 1.4% decrease on fecal P, a 7.2% increase on Ca utilization, which was significantly higher than (P〈0.01) those of the other four Diets, a 3.9% increase on G:F, which was similar to that of Diet 1, and a 2.3% increase on CP utilization, which was higher than (P〈0.05) that of the other three diets. In summary, the results of this study indicated that citric acid, intrinsic and bacterial phytase might have some additive or synergistic effects, and low-nutrient CSB diets with 15% wheat middlings, 750 U kg^-1 phytase, and 3% citric acid might substitute completely for standard CSB in broilers. 相似文献
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Wood NV 《Science (New York, N.Y.)》1947,105(2733):531-532
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[目的]研究氮、磷、钾、镁、锌、硼肥对木薯养分吸收及生长的影响.[方法]采用田间试验,设最佳施肥处理OPT(N+P+K+Mg+Zn+B)、减氮施肥OPT-N、减磷施肥OPT-P、减钾施肥OPT-K、减镁施肥OPT-Mg、减锌施肥OPT-Zn、减硼施肥OPT-B处理和不施肥处理,测定各处理木薯产量以及块根、茎、叶养分吸收量和养分吸收强度.[结果]OPT处理木薯所吸收的N、P、K、Zn养分主要累积在茎部,Ca、Mg养分主要累积在叶片和茎部,B养分主要累积在叶片部位中.木薯对N、P、K养分的吸收强度呈抛物线状,在块根膨大期前呈逐渐提高,块根膨大后,木薯对N、P、K养分的吸收强度逐渐下降.增施N、P、K、Mg肥,木薯产量分别提高38.01%、13.09%、23.14%和8.99%;增施1 kgN、P2O5、K2O、MgO木薯产量分别增加101、54、22和49 kg; OPT处理产值最高(13217元/ha).[结论]施肥均可提高木薯的养分吸收量,但K、Za、B肥会抑制Mg的吸收.不同施肥条件对木薯产量有显著的影响. 相似文献