某陆地生态系统中，除分解者外，仅有甲、乙、丙、丁、戊5个种群。调查得知，该生态系统有4个营养级，营养级之间的能量传递效率为10％～20％，且每个种群只处于一个营养级。一年内输入各种群的能量数值如下表所示，表中能量数值的单位相同。
回答下列问题：
(1)请画出该生态系统中的食物网_____。
(2)甲和乙的种间关系是_____，种群丁是该生态系统生物组分中的_____。
(3)一般来说，生态系统的主要功能包括物质循环、能量流动，此外还具有_____等功能。碳对生物和生态系统具有重要意义，碳在生物群落和_____之间的循环主要以C02的形式进行。
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