微生物在环境保护中的应用及前景

从环境保护的角度出发,重点论述了微生物在这一领域的应用现状与发展前景,指出微生物将会在21世纪的环境保护领域中发挥重要作用。     

大理湿地特点与管理对策

根据大理湿地的现状和特点，针对湿地保护和管理中存在的问题，提出了积极有效的保护对策和管理措施。     

防雷型熔断器新产品开发可行性的讨论

本文主要对低压配电系统SPD的过电流保护装置进行了讨论,并阐述了新型防雷型熔断器的设计思路和自有独创性。     

达里诺尔湖湿地生态系统服务价值评价

生态系统服务功能是生态系统与生态过程所形成及所维持的人类赖以生存的自然环境条件与效用,对其服务价值进行货币化评价,可以推动自然资源可持续利用,促进区域生态环境保护。以达里诺尔湖湿地为研究对象,结合达里诺尔湖湿地生态系统的结构、特征及其生态过程特点,通过资料搜集与实地调研,运用资源经济学理论和方法,对达里诺尔湖湿地生态系统服务价值进行了划分。构建了达里诺尔湖湿地生态系统服务价值评价指标体系,并对其进行了价值评价。评价结果显示达里诺尔湖湿地的服务价值为93.70×10⁴万元,其中直接使用价值为2.19×10⁴万元,占比为2.36%,间接使用价值为91.51×10⁴万元,占比为97.66%。各项生态系统服务功能中以调节空气湿度价值最大,为82.76×10⁴万元,占总服务价值的88.32%。     

8个樱花品种播种育苗技术研究

本文介绍了8个樱花品种的种子从储藏、催芽、播种到苗期管理的试验全过程,总结出一种简便易操作的樱花播种育苗技术,可供生产设施比较简陋的地方借鉴和参考。     

紫薇栽培管理技术

指出了紫薇作为城乡绿化的重要树种，适宜于庭院、园路两侧、池畔河边栽植。结合栽培管理实践，系统地总结了紫薇树的育苗、修剪和病虫害防治技术。     

山核桃天然群体家系种实和幼苗性状变异分析

基于岛石天然林山核桃自由授粉产生的44个单株果实与种子的表型及由种子实生繁殖1年生幼苗生长性状11个指标的数据,分别计算了各指标的特征值,并进行了方差分析,研究其自然变异.结果表明,果实和种子各表型变异程度不一,其中以果实质量的变异系数最大,为11.22％;其次是种子质量和出籽率,分别为8.64％和7.66％;种实各指标在采样单株间的差异均极显著.除果实质量与果形指数和种形指数之间无显著相关外,其余各指标两两间相关均极显著.1年生苗木苗高和地径变异系数分别达13.99％、10.28％,且各家系间差异极显著;苗高与地径的Pearson相关系数为0.552,相关性极显著.2个苗木生长指标与9个种实表型指标间相关性不显著.     

我国名人故居保护与利用的回顾与展望

指出了名人故居保护与利用是当前我国历史文化建筑保护的重要内容,通过对我国名人故居研究现况和保护阶段的梳理,从特征内涵、保护传承和开发利用3个方面归纳了我国现有名人故居保护的基本内容与特点。以此为基础,探讨了对名人故居保护利用研究的趋势与展望。     

Interactions between crop biomass and development of foliar diseases in winter wheat and the potential to graduate the fungicide dose according to crop biomass

Foliar pathogens such as Zymoseptoria tritici and Puccinia striiformis causing septoria leaf blotch and yellow rust respectively can cause serious yield reduction in winter wheat production, and control of the diseases often requires several fungicide applications during the growing season. Control is typically carried out using a constant fungicide dose in the entire field although there may be large differences in crop development and biomass across the field. The objective of the study reported in this paper was to test whether the fungicide dose response curve controlling septoria leaf blotch and other foliar diseases in winter wheat was dependent on crop development and biomass level. If such a biomass dependent dose response was found it was further the purpose to evaluate the potential to optimize fungicide inputs in winter wheat crops applying a site-specific crop density dependent fungicide dose. The study was carried out investigating fungicide dose response controlling foliar diseases in winter wheat at three biomass densities obtained growing the crop at three nitrogen levels and using variable seed rates. Further the field experiments included three fungicide dose rates at each biomass level, an untreated control, and 75%, 50% and 33% of the recommended fungicide dose rate and the experiments were replicated for three years. Crop biomass had a significant influence on occurrence of septoria and yellow rust with greater disease severity at increasing crop biomass. In two of three years, the interaction of crop biomass and fungicide dose rate had a significant influence on disease severity indicating a biomass-dependent dose response. The interaction occurred in the two years with high yield potential in combination with severe disease attack. If the variation in crop density and biomass level obtained in the study is representative of the variation found cultivating winter wheat in heterogeneous fields, then there seems to be scope for optimizing fungicide input against foliar diseases site-specific adapting the dose according to crop density/biomass.     

美国红枫组织培养研究进展

根据国内外关于美国红枫组织培养的研究,以及实际生产中的经验系统阐述了美国红枫组织培养体系建立的具体过程及研究进展,并提出了存在的问题及展望,为美国红枫的大批量组培苗商业生产提供基础资料。