基于AutoCAD软件确定番茄与青椒叶面积的简易方法

为准确而方便的获取番茄和青椒的叶面积,本研究利用扫描仪获取叶片图像,通过AutoCAD获取叶片的实际面积,并与田间实测叶长、叶宽及叶片长宽乘积分别进行回归分析,分别建立了叶长、叶宽及长宽乘积与实际叶面积的回归模型。研究结果表明,叶长、叶宽与叶面积呈幂函数关系,长宽乘积与叶面积呈线性关系;分别对3种估算模型模拟值进行误差分析结果显示,叶长、叶宽回归模型的模拟精度较差,而长宽乘积回归模型的模拟误差很小,精度较高,可以较真实地反映番茄和青椒叶面积的实际大小,叶片长宽乘积估算叶面积的折减系数分别为0.6393和0.6509。     

AFLP增效和减效位点预测杂交水稻产量性状模型构建

选用13个水稻不育系和19恢复系按NCⅡ设计配制2套半双列杂交组合,分别用每套组合F1产量性状对该套亲本AFLP多态性位点(总位点)进行筛选,获得阳性、增效和减效三类位点。分别用基于总位点、阳性、增效和减效4类位点的亲本遗传距离构建AFLP标记预测模型,对另一套组合产量性状进行预测。结果表明:(1)总位点中只有少数为阳性位点。与总位点相似,阳性位点用于产量性状预测时,预测值与实际值的相关系数(以下简称为预测系数)太低;(2)而单独利用增效或减效位点,以及同时利用该2类位点(构建二元模型),3类预测效果均大大提高,其中增效位点对结实率,增效或减效位点,及同时利用增效和减效位点对单株产量,4个预测系数在0.6以上,可以用于指导水稻育种;(3)利用2套组合均筛选到的共同增效和减效位点的预测也达到较高水平,其中4个预测系数在0.5以上,因其所使用的预测位点数大大减少,应用更为有利。     

杂交水稻区试点对组合的判别力比较研究

基于更合理的欧氏距离Dj^*值的计算方法，利用AMMI模型对广东省2000年晚造杂交稻感温组区试资料进行分析，综合评价了各个区域试验点对组合的判别力，结果表明惠来、东莞、新兴、南雄和湛江这5个试点具有较强的组合判别，是较为理想的水稻感温组区试点。同时对几种估算区试点判别力垢参数进行了比较。     

协优63制种应注意的几个问题

协优６３制种应注意的几个问题安徽省巢湖市种子公司白湖劳改农场种子公司朱同贵，王松洋，邓庆云协优６３组合因产量高、米质优、抗性强，种植面积逐年扩大。但协青早Ａ播始历期等特性易受气候条件、栽培措施影响，常常造成制种单产时高时低，在一定程度上制约着协优６３...     

非洲推广中国杂交水稻技术思考

非洲水稻宜植面积大,种植面积少,单产低,技术管理水平较为落后,杂交水稻应用面积极小。发展杂交水稻对促进非洲农业资源的合理利用、粮食安全具有重要战略意义。农业是许多非洲国家的主要产业,其可塑性强、农业资源丰富,具备了发展和推广杂交稻的重要条件。目前,许多非洲国家农业规划和管理体系不健全,农业基础设施落后,缺乏相关助推产业,从而导致该地区杂交稻应用落后。通过促进国际官方沟通、转变当地农业发展观念、推动种业合作开发、强化示范引导功能、激活相关助推产业链、开展针对性品种选育和资源积累、倡导区域配套产业政策和基础设施的改进与完善,有利于杂交稻种子、技术在非洲的应用与普及。     

非洲杂交水稻发展刍议

非洲水稻宜植面积大,种植面积少,单产低,技术管理水平较为落后,杂交水稻应用面积极小.发展杂交水稻对促进非洲农业资源的合理利用、粮食安全具有重要战略意义.农业是许多非洲国家的主要产业,其可塑性强、农业资源丰富,具备了发展和推广杂交稻的重要条件.目前,许多非洲国家农业规划和管理体系不健全、农业基础设施落后、缺乏相关助推产业,从而导致该地区杂交稻应用落后.通过促进国际官方沟通、转变当地农业发展观念、推动种业合作开发、强化示范引导功能、激活相关助推产业链、开展针对性品种选育和资源积累、倡导区域配套产业政策和基础设施的改进与完善,有利于杂交稻种子、技术在非洲的应用与普及.     

高粱体细胞无性系变异育种若干问题的探讨

基于我们自己的研究实践和设想,对高粱体细胞无性系变异育种的几个主要问题进行了分析讨论,指出高粱体细胞无性系变异育种是一种比较实用和有效的育种技术,进一步开展高粱体细胞人工诱变筛选育种具有很重要的意义。     

杂交水稻生态条件与病虫害之关系

籼型杂交水稻,自从在全国各地推广以来,较之常规水稻具有明显的生长优势和产量优势。全国到1988年止,累计种植杂交水稻面积12.56亿亩,增产稻谷1534.5亿公斤,增加产值为295.53亿元。杂交稻由于生长势不同,生态条件互异,因而导致病虫的种群数量和消长也有较大变化。现就杂交水稻、常规水稻中的几种主要生态条件,与病虫发生、危害之关系     

1996～1998年杂交水稻主要品种的胞质类型分析

杂交水稻的生产应用为我国粮食生产作出了巨大贡献,其种植面积占水稻年播种面积的50%以上.本文采用九种不育胞质类型划分法,对我国1996～1998年杂交水稻主要品种的胞质类型进行了分析.生产上应用的三系杂交稻按其胞质类型所配组合的播种面积比重排序依次为野败型、冈·D型、印尼水田谷型、矮败型、两系、红莲型、K型和BT型;野败型的面积比重在逐年下降,冈·D型、印尼水田谷型和矮败型等的面积比重在逐年增加.两系杂交稻10余个组合通过了省级审定,培矮64S的广泛应用展示了两系杂交稻超三系的广阔前景.我国已育成超级杂交稻苗头组合,个别组合在部分连片示范点(6.7hm2)达到了日产稻谷100 kg/hm2的超级稻指标.     

泸县建设国家级杂交水稻种子生产基地路径的探讨

泸县位于四川东南部,是全国产粮大县,常年水稻制种面积达2000hm2左右,2013年7月被农业部认定为国家级杂交水稻种子生产基地。本文结合对泸县杂交水稻生产有利条件和存在问题的分析,提出了促进杂交水稻种子基地建设可持续发展的对策建议。     

寒冷地区校园度日数法建筑能耗基准线的确定方法

校园建筑面积的迅速增长,导致校园建筑能耗占社会总能耗的比重越来越大。为了加强节约型校园建设管理,在建筑能耗基准线理论方法学的基础上,进行校园建筑能耗基准线的测算与研究。基于大量的能耗数据,笔者对校园建筑进行分类研究,提出了在使用功能分类的基础上将公共教学建筑按照空调系统形式进行细化分类的方法。最后采用四分位数法测算了各类校园建筑能耗基准线,提出低能耗水平、平均能耗水平和高能耗水平三类基准线,并给出实际应用中的建筑能耗基准线的修正方法。     

广东省水稻生产的现状及对策

广东地处亚热带,气温高、日照长,具备水稻优质高产的天然气候条件,有着悠久的水稻种植历史,是中国13大粮食主产区,自矮化育种以来创造了“粤稻现象”的辉煌成绩。然而,多年来,广东大米自给率仅为30%左右,对其他地区大米的依赖程度相对较高。随着新冠肺炎疫情的爆发和蔓延,广东的大米安全受到一定程度的影响。在这种新形势下,本研究通过查阅《中国农业统计年鉴》《广东统计年鉴》《广东农村统计年鉴》等相关资料,调研了广东水稻生产的现状并分析其存在的问题,针对问题提出要通过政策引导、加强突破性品种培育、构建完善的推广示范体系、数字化销售渠道及延伸水稻价值链,推动产业的发展。     

Inequity on suburban campuses: University students disadvantaged in self-improvement travel

Many new university campuses have been built in suburban areas where transit and service facilities are negligible. However, few studies explore the educational and transportation equity issues related to campus location. Based on a 2017 survey comprising 1673 students on 37 campuses in Shanghai, this study applied multilevel models to examine the association between the built environment around campuses and university students' travel behaviors. In particular, we focused on the travel that students undertake for self-improvement activities (e.g., internships and education-related activities) because this type of travel plays an important role in improving students' abilities and promoting their career development. We found that students on suburban campuses, which are characterized by being farther away from the city center, being single land use, and having fewer transit services, engage in fewer and longer trips to self-improvement destinations. However, students studying on urban campuses, which are characterized by mixed land use and greater accessibility to the city center and subway service, engage in more frequent and shorter trips to self-improvement destinations. Therefore, students on suburban campuses are at a disadvantage regarding educational opportunities and access to transportation to engage in self-improvement activities off campus.     

Campus Traffic Calming: A Case Study of Xipu Campus,Southwest Jiaotong University

With an increasingly number of cars on campus, the campus is faced with challenges of traffic order and safety. This paper, based on traffic calming and practical experience, took the Xipu campus of Southwest Jiaotong University as an example. Grounded on the traffic situation and characteristics of Xipu campus, the study analyzed the concept of traffic calming and its engineering measures, put forward traffic calming design scheme for Qiuhua Road on the Xipu campus with practical application of campus traffic characteristics, and stated the significance of campus traffic calming for its driving effect in creating an atmosphere of "environment cultivation" on campus. Finally, this paper discussed the development and application of traffic calming in China.     

Study on the Integration and Optimization of Campus Spaces: A Case Study of Yaohu Campus of Jiangxi Normal University

In view of the problems brought by blind expansion of campus, such as lack of public spaces, oversized spaces, and improper traffic designs, this paper took Yaohu Campus of Jiangxi Normal University for example, proposed the methods for integrating and optimizing campus spaces, such as establishing artistic conception of campus space, improving campus traffic organization, creating and improving the external communication spaces, on the basis of analyzing evolution history of campus spaces.     

Human Landscape Construction on Campus: A Case Study of Colleges and Universities in Northwestern Anhui

This paper selected colleges and universities in northwestern Anhui for research to analyze the current situation of human landscape construction on campus in northwestern Anhui and discuss the deficiency in the human landscape construction on campus in northwestern Anhui. It also proposed principles that should be followed in the human landscape construction on campus as well as optimization measures to create a harmonious campus full of humanity, with a view to providing a reference for the human landscape construction on campus in northwestern Anhui.     

生态城市背景下的地方高校校园景观建设探讨 ——以皖西北高校校园景观建设为例

高校校园景观是生态城市建设的重要组成部分,而随着生态园林城市建设的兴起,地方高校校园景观的建设更是生态城市建设不可或缺的有机组成部分。通过地方高校校园的生态环境建设,对于生态城市整体协调发展,促进城市建设的其他因素的发展起着至关重要的作用。以皖西北高校校园景观为例,分析生态城市背景下皖西北地方高校校园景观建设中存在的问题,从生态城市发展的角度,提出用多维的观点加强与地方城市的生态建设相衔接、发挥“生态核”景观的作用、创造和谐型与节约型的校园景观空间、紧扣地域历史文化特色的皖西北地方高校校园景观建设的发展思路。     

Application of Cognitive Map in Campus Environment Evaluation

On the basis of interpreting concept and features of cognitive map, this study took landscape investigation in Tianjin Agricultural University for example to analyze the application of cognitive map on campus. By analyzing five major elements (path, edge, node, district and landmark), the direction of and suggestions for campus reform were given as the reference for applying cognitive map in campus environment research.     

四川丘区旱作主要生物灾害防治策略与技术

四川丘陵区是四川省面积最大、人口分布最集中的区,伴随着农业重心从成都平原转向盆中丘陵,四川丘区农业成为全省经济特别是农业的重要区域.近年来,由于异常气候和生态环境恶化,农业生物灾害常年影响丘陵地区农业活动,制约了丘区的农业生产和经济发展.因此,为了绿色安全地进行农业生产活动,笔者总结了丘区旱作农业主要生物灾害的防治策略...     

建设本科食品专业校内实习基地职业环境

建设本科食品专业校内实习基地职业环境,包括环境建设和创新发展模式,应与食品企业环境结合,营造工作实境,同时进行课程改革与创新,实现与企业需求的"无缝"对接,对培养适应现代企业的应用型人才具有重要的意义。