农业复合生态系统是具有特定功能的复合体，如何全面地分析和评价农业复合生态系统，目前仍是困扰生态系统研究的难题。
Agricultural complex system has the special functions and how to comprehensively analyse and evaluate it is till the problem of ecosystem research.
沼气发酵系统是复合农业生态系统中物质循环和能量转化的枢纽。
Biogas system is the pivot in material recycling and energy transformation of a complex agro-ecosystem.
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