Some derive their carbon from inorganic sources, and their hydrogen from hydrogen sulfider or other inorganic compounds, while other bacteria may be photosynthetic or saprobic.

某菌从无机原料中获取碳源，从硫化氢或其他无机化合物中获取氢，而另菌则是光能合成的或腐生的。

The ecological features of phytoplankton community were preliminarily studied in the Taihu Lake.The trophic level and saprobic degree of the lake were evaluated in whole and in sub areas respectively.

通过湖浮游植物群落生态学的研,湖春季水质污染及富营养化进行总评及分区评价。