一、能量在农业系统中的作用在自然生态系统中,通过系统生物群落把太阳能转化为生物量,形成自我维持的生态系统(如自然植物、野生动物)。然而在农业系统中,太阳能是通过人类的活动直接或间接地转化为食物、木材和其它可利用的产品。外部能量的投入有助于提高太阳能的转化率。在传统农业系统和现代农业系统中,外部能量投入的数量和结构是不同的。传统 I. The Role of Energy in Agricultural Systems In natural ecosystems, solar energy is converted into biomass by systemic biomes to form self-sustaining ecosystems (eg, natural plants, wildlife). However, in the agricultural system, solar energy is directly or indirectly converted into food, timber and other available products through human activities. The input of external energy helps to improve the conversion rate of solar energy. In traditional agricultural systems and modern agricultural systems, the amount and structure of external energy inputs are different. Tradition