黄土高原家庭农业生态系统的能量流特征

Energy Flow Characteristics of Household Agri-Ecosystem on Loess Plateau

以能量生态学为基础,分析了黄土高原19个家庭农业生态系统的能量流特征.研究结果表明:农牧型、农林型、农副型、综合型家庭农业生态系统能量流可分为系统外输入能量、系统内子系统之间流动的生物能、输出到系统外的生物能;农牧型、农林型、农副型、综合型家庭农业生态系统农田子系统无机能投入具有较高水平,带有石油农业特征;畜禽子系统的饲料能决定畜禽子系统投入能量的水平.

The characteristics of energy flow 19 household agri-ecosystems were analyzed based on energy ecology.The result indicated that the energy flow of agri-livestock type,agri-forest type,comprehensive type and agri-sideline type could be divided into energy input from outside system,bio-energy flow among subsystems and the bio-energy output from the system.The four types of farmland subsystem,with petrol-agriculture characters,input high inorganic energy.The level of energy input in animal husbandry subsystem was determined by the food energy.