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下图表示农田生态系统的部分物质循环模式图,其中甲、乙、丙分别为该生态系统的组成成分, A 、 B 、 C 是丙中三种生物。据图回答: ( 1 )若 “ 玉米 → 田鼠 → 蛇 → 猫头鹰 ” 是该生态系统中的一条食物链,则玉米是该生态系统组成成分中的 __________ ,丙中的 [ ] (填字母)代表蛇。 ( 2 )图中 C 和 B 之间存在捕食关系和 ___________ 关系。从理论上分析,若大量捕杀 A ,一定时间内 B 的数量先 ___________ ,后趋于稳定。 ( 3 )该生态系统的生物种类和数量少,其自动调节能力 _____________ 。
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