本文从生态学能量流的角度研究了简阳县不同时期农田系统能量投入量、投能结构，投能效率及能量投入产出关系。
The energy inputs and their structure, efficiencies, and the relationship between energy input and output in the farmland ecosystem of Jianyang County were studied in this paper.
利用生态学和经济学统计方法分析了1950-2000年庙岛群岛海岸带农田生态系统服务价值的演替变化。
The successive variation in ecosystem service value of farmland in Miaodao archipelago from 1950 to 2000 is analyzed by using ecological and economics methods.
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