导致水生态系统退化的原因多种多样，而人类经济活动的不当是主要的作用因子。
The reasons leading to the degeneration of aquatic ecosystem are various and the mismanagement of human economic activities is the major factor.
水生植物腐烂分解作为湖泊生态系统物质循环以及能量流动的关键环节，是维持湖泊生态系统功能的主要过程之一。
As a key aspect of material cycle and energy flow of lake ecosystem, decomposition of lake aquatic plants is one of the main process of maintaining the lake ecosystem functions.
介绍了以保护自然生态系统中水生生物为主要目标的美国水质基准技术指南。
According to the guidelines, numerical water quality criteria were derived on the basis of screening and analysis of toxicity test data of individual animal and plant species.
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