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.

某些细菌从无机原料中获取碳源，从硫其他无机合物中获取，而另些细菌则是光能合成腐生。

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.

太湖浮游植物群落生态学研究,对太湖春季水质污染及富营养进行总评及分区评价。