但是，甲壳素沉积从来没有积累成海洋或森林有机质层。
But chitin deposits never build up on the sea or forest floor.
沉积物中有机物的降解反应主要在还原状态下进行。
The organic matter decomposition was occurred under the anaerobic condition.
水主要来源于古海水和大气降水，有机质来源于沉积岩中生物质；
The water mostly comes from ancient sea and atmosphere while organic material from ancient life-form.
表层沉积物主要污染因子为有机质；
The primary pollutant of surface sediment is Organic matter.
表层沉积物主要污染因子为有机质；
The primary pollutant of surface sediment is Organic matter.
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