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【简答题】
近年来，家禽生态养殖在我国发展很快。某地区建立了“稻―鸭”共作的生态型农业生产体系(如下图所示)，实现了稻、鸭的双丰收。请回答下列问题。 (1)从生态系统的组成成分上分析，该生态系统的生产者是_______，沼气池中的生物属于_________。此生态系统的建立实现了物质和能量的_________。 (2)过去，羽毛加工厂通常将废弃的羽毛填埋于土壤中，利用土壤中的微生物将其分解。为了充分利用废弃的羽毛中的蛋白质资源，某研究小组欲从土壤中分离出能够水解羽毛角蛋白的细菌，他们应从____处取土壤，并制成土壤稀释液。
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