农地非农化配置效率及影响因素研究——基于湖北省的调查分析     

张雄  赵梓羽 《安徽农业大学学报》2019,28(4):42-48

城镇化进程快速推进诱发了农地非农化的快速增长,土地作为重要的农业资源,越来越凸显其稀缺性。由于湖北省各城市城镇化发展过程中不同程度的土地资源要素过度投入,导致区域农地非农化配置效率低下。环境因素对区域农地非农化的配置效率有显著的影响,因此,通过合理调控区域农地非农化过程中的环境影响因素可以在一定程度上提升区域农地非农化配置效率。分析湖北省2013—2017年各个城市农地非农化配置效率及其影响因素,目的是科学合理配置及高效利用土地资源。  相似文献   

基于自动编码触发器的食用油召回管理系统的设计     

王禹鹏 《黑龙江八一农垦大学学报》2009,21(3):95-97

为克服管理食用油销售记录易出错,管理人员任务繁重等弊端,开发了基于自动编码触发器技术的食用油召回管理系统,用于食用油销售记录的自动管理。通过对系统中不同角色的分析,建立了角色间的关系,经测试,该系统可以很好地应用于食用油企业的生产管理工作中。  相似文献   

食用菌线虫病害发生规律与防治研究     

方炎祖  罗桂菊 《湖南农业大学学报(自然科学版)》1991,(3)

侵染食用菌的线虫主要来源于各种培养料、复土和污水,从食用菌床及菌体中分离到的线虫有Aphelenchoides composticola,Ditylenchus myceliophagus,Paraphelenchus myceliophthorus和3种杆型线Rhabditida、app.在蘑菇栽培期的9月中旬至10日上旬和翌年的4月下旬至5月上、中旬发生危害最重,各有一次发生高峰。用克线磷和甲醛处理培养料,蘑菇可分别平均增产2.4％～31.0％。  相似文献   

弱光处理对番茄不同生育期形态和生理指标的影响   总被引：55，自引：2，他引：55  

侯兴亮  李景富  许向阳 《园艺学报》2002,29(2):123-127

 研究结果表明: 番茄不同生育阶段耐弱光性不同, 弱光下番茄苗期表现为徒长趋势, 叶干样质量/ 叶面积与叶面积/ 全株干样质量上升, 叶绿素含量、叶绿素b/ a 值和坐果率增加, 可溶性糖和可溶性蛋白含量下降; 与苗期相比, 开花坐果期POD 酶活性和可溶性蛋白含量增加, 坐果率下降。  相似文献   

Black Streak of Edible Burdock Caused by Itersonilia perplexans in Japan     

Harukuni HORITA  Shinji YASUOKA 《Journal of General Plant Pathology》2002,68(4):277-283

Black streak disease of edible burdock (Arctium lappa L.) has been observed periodically in Hokkaido Prefecture, Japan since 1988. Symptoms appeared initially as small, dark brown to black spots on the leaf veins and petioles. The necrotic spots developed longitudinally along the leaf veins or petioles. Diseased leaf veins or petioles occasionally snapped off at the necrotic lesions. An Itersonilia sp. was isolated from rotting leaf veins and petioles. Laboratory inoculations of edible burdock seedlings using ballistospore suspensions produced typical symptoms observed in nature. The fungus had a feathery mycelium and developed a white to pale cream colony color. The mycelium was composed primarily of branched hyphae with clamp connections at the septa. Ballistospores, formed at the apex of inflated cells, were lunate, ovoid to pyriform. The fungus occasionally produced appressoria, chlamydospores and yeast cells. Based on the morphological characteristics, the causal agent was identified as Itersonilia perplexans Derx. Edible burdock strains were also pathogenic to chrysanthemum and caused petal blight. This report is the first of a foliar disease of edible burdock caused by I. perplexans in Japan. Received 8 April 2002/ Accepted in revised form 26 June 2002  相似文献   

乳清蛋白可食用膜的研究进展   总被引：2，自引：0，他引：2  

王芳  张兰威 《乳业科学与技术》2007,29(3):109-112

由于近年来人们环境意识的增强，乳清蛋白可食用膜的研究引起了人们的关注。文章介绍了乳清蛋白可食用膜的成膜机制、功能特性及其影响因素，对近年来乳清蛋白可食用膜的研究情况进行了综述。  相似文献   

安全选择标记的转基因食用菌研究进展   总被引：2，自引：0，他引：2  

赵姝娴  林俊芳  王杰  郭丽琼 《食用菌学报》2007,14(1):55-61

在食用菌外源基因转化过程中,目的基因的导入常需要串联易于识别的选择标记基因,用于转化子的筛选。当筛选完成后,选择标记基因特别是抗性标记基因的存在即是多余的,甚至是有害的,存在生物安全隐患。有鉴于此,本文对获得安全选择标记基因的转基因食用菌作一综述。  相似文献   

The role of nontimber tree products in household food procurement strategies: profile of a Sri Lankan village     

C. M. Caron 《Agroforestry Systems》1995,32(2):99-117

Reliance on nontimber forest products from homegardens and forests in a Sri Lankan village is presented. Land and tree tenure in this village adjacent to the Sinharaja Man and the Biosphere (MAB) Reserve have shifted dramatically because of changing priorities in forest management recently shifting from utilization toward complete forest protection. Local residents must adapt to a new set of social circumstances. Household demographics, access to land, and income from nontimber forest products (NTFPs) and external employment are examined as pertinent to household food acquisition. Linear correlations show significant associations between income generated from the sale of agricultural produce and nontimber forest products and the amount of money allocated to food purchases. Fifty-five edible plant species were found in homegardens. Four forest tree species provide food regularly. Case studies are essential in increasing the natural resource manager's awareness about the role of agroforestry in protected areas management and his or her understnading of promoting protection without compromising subsistence needs.  相似文献   

Species composition, similarity and diversity in three successional stages of a seasonally dry tropical forest   总被引：1，自引：0，他引：1  

M. Kalacska  G.A. Sanchez-Azofeifa  J.C. Calvo-Alvarado  M. Quesada  B. Rivard  D.H. Janzen 《Forest Ecology and Management》2004,200(1-3):227-247

The objectives of this study were to describe the floristic composition, species diversity, similarity and richness among three stages of forest regeneration, and to investigate the influence of the previous land use on species composition in a seasonally dry tropical forest in northwestern Costa Rica. The species diversity and richness of woody stems with diameter greater or equal to 5 cm in 26 0.1 ha plots was found to be the greatest in the intermediate stage followed by the late and early stages. The structural changes of this chronosequence of successional stages were quantified with a modification of the Holdridge complexity index. Using satellite imagery for site selection and historical ground truth analysis the influence of past land use and the frequency of anthropogenic disturbances on species composition was illustrated.  相似文献   

印度喜马拉亚东部3个经济竹种的分布、生长和生产力     

B.P. Bhatt　L.B. Singha　Kundan Singh　M.S. Sachan 《世界竹藤通讯》2004,2(3):22-32