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淡水生态系统生产力
释义
淡水生态系统生产力
Encyclopedia
理学
淡水生态系统生产力
释
freshwater ecosystem productivity
淡水生态系统生产力
有广义和狭义之分。从广义上讲,是指淡水水体中所有生物的总生产能力,而不是仅局限于对人类有价值的所谓经济产物;狭义上来说,是指淡水水体中能满足有经济价值的生物生长、发育、繁殖的性能,水体中生产的经济产品越多,则其生产力越高。淡水生态系统生产力的大小,不仅与水体理化特性(如肥沃程度)有关,也与其中生物组成及人类的经济活动有关。
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manyseeded euptelea
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many-to-many mapping
many-to-one
many-to-one correspondence
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