生态农业知识中心

效率:创新型生态农业方法用更少的外部资源带来更高的产出

提升资源利用效率是生态农业系统的一项新属性,通过仔细规划和管理多样性,在系统各构成部分之间形成协同效应。比如,效率方面的一项关键挑战在于全球农田中施用的氮肥仅有不到50%转化为收获产品,其余部分损失在环境中,导致严重的环境问题。

生态农业系统改善对自然资源,尤其是丰富和免费资源的利用,如太阳辐射、大气中的碳和氮元素等。通过促进生物过程以及生物质、营养素和水的循环使用,生产者能够用更少的外部资源,降低成本并减轻资源利用所产生的负面环境影响。最终,减少对外部资源的依赖能够通过提升生产者的自主能力和应对自然或经济冲击的抵御力来赋予其权能。

衡量综合性系统效率的一种方法是土地当量比。土地当量比对比了两种或以上品种(如作物、林木、家畜)共同种养时的单产以及通过单作实现的单产水平。综合性系统往往展示出更高的土地当量比。

因此,生态农业通过必要的生物、社会经济和机构多样性,以及与时空的匹配来推动农业系统,支持提高效率。

 

Database

One of the main problems of the páramo ecosystem (altitudinal belt of the tropical mountain between 3,000m and 4,000m) is conventional potato production. The use of agrochemicals in food production is degrading the ecosystem and polluting the water that reach more than 8 million inhabitants of the city of Bogotá,...
Colombia
创新
2018
Érosion, désertification, salinisation, à Fimela, delta du Saloum, 30 % seulement des terres agricoles restent cultivables. C’est la cause du bradage des terres et de l’exode rural vers les villes ou vers l’étranger. Pour  remédier, l’ambition de Jardins d’Afrique est de former des jeunes à la pratique d’une autre agriculture,...
Senegal
创新
2018
The Green Revolution, the symbol of agricultural intensification not only failed to ensure safe and abundant food production for all people, but it was launched under the assumptions that abundant water and cheap energy to fuel modern agriculture would always be available and that climate would be stable and not...
工作文件
2012
FAN was born out of the need to regularly inform a wide range of stakeholders about aquaculture development, especially in developing countries, to disseminate news about the many and diverse FAO field projects, and to inform about FAO global activities developed at headquarters. This issue is being published ahead of an important intergovernmental event, the 10th Session of the COFI SCA, to...
新闻通讯
2019
Everyday Experts explains how knowledge built up through first-hand experience can help solve the crisis in the food system. It brings together fifty-seven activists, farmers, practitioners, researchers and community organisers from around the world in 28 original chapters to take a critical look at attempts to improve the dialogue between...
书籍
2017