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    This publication contains the main findings of the Global Forest Resources Assessment 2020 (FRA 2020). The data in FRA 2020 have been obtained through a transparent, traceable, reporting process and a well- established network of officially nominated national correspondents. The information provided by FRA presents a comprehensive picture of the world's forests and the ways the resource is changing. Such a clear global picture supports the development of sound policies, practices and investements affecting forests and forestry.
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    本技术手册首先介绍了鱼菜共生的概念,包括其发展简史及其在无土栽培和现代农业大范畴中的地位。随后是鱼菜共生的主要理论框架,包括氮循环和硝化作用、细菌的作用、鱼菜共生系统均衡的概念;接着介绍了重要的技术内容,包括水质参数、水质测试和鱼菜共生的水源,以及系统设计的一些方法和理论,包括三种主要的鱼菜共生系统:基质床栽培、营养膜栽培和深水栽培。本手册详细介绍了鱼菜共生生态系统组成的三类生物(细菌、植物和鱼类),手册还介绍了管理策略和故障排除方法以及相关的话题,尤其强调了鱼菜共生投入品中当地可持续材料的使用。本手册还包含九个附录,介绍了其他重要内容:鱼菜共生中常见植物生长的最适条件;常见病虫害的化学和生物防治,包含一份共用的种植指南;常见鱼病及其症状、病因以及治疗方法;在鱼类种群量和投饲量一定的条件下,计算生成的氨含量和所需的生物过滤介质数量;自制鱼饲料的生产;建立鱼菜共生系统装置的步骤和注意事项;小规模基质栽培鱼菜共生系统的成本收益分析;构建三种小规模鱼菜共生系统的综合指导步骤;以及本手册的简要总结,用作拓展、延伸和教育的补充材料。
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    These country reports are prepared as a contribution to the FAO publication, The State of the World’s Biodiversity for Food and Agriculture. The preparation of Country Reports provided an overview of existing information gaps and helped to establish a baseline information on biodiversity for food and agriculture. They also provided information on the role of biodiversity for food and agriculture in the provision of multiple ecosystem services. These country reports helped to address the following questions: • What is the state of the conservation and use of biodiversity for food security and nutrition, ecosystem services and sustainability? • What trends can be identified in the conservation and use of biodiversity for food and agriculture and in the effects of major drivers of change? • How can conservation and use of biodiversity for food and agriculture be improved and the contributions of biodiversity to food security and nutrition, ecosystem services, sustainability and the improvement of livelihoods of farmers, pastoralists, forest dwellers and fisher folk be enhanced?