能流 energy flow，energy flow in ecosystem
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指生态系统的生物间及生物和非生物间的能量转移，也称能流转换。从太阳来的一部分光能由“生产者”变为化学能，之后，主要分为活食物链、腐食物链两个方向。能流依次通过营养级别而进行，能量通过这些营养级别，作为非同化能量、生物生活能量（呼吸）等而消耗，一部分作为生物体能量而贮藏，其余的能量则输向高一级的营养级别。各种能量的分配是按构成非生物的环境和各营养级别的群落特征而取得其量。
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