摘要:
以流入辽东湾的4条入海河流(小凌河、大凌河、双台子河、辽河)河口处沉积物和大凌河附近的水稻田土、玉米旱地和芦苇湿地为研究对象,采用悬浮液振荡培养法,测定河流沉积物及附近的土壤硝化强度和反硝化强度。结果显示,4种不同河口沉积物的硝化强度和反硝化强度差异显著,硝化强度在1.32~4.89 mgN/kg·d之间,且小凌河>双台子河>辽河>大凌河;反硝化强度在5.44~10.47 mgN/kg·d之间,且辽河>双台子河>小凌河>大凌河。大凌河不同利用方式的土壤硝化强度在1.32~2.92 mgN/kg·d之间,河流沉积物最小,土壤反硝化强度在3.79~7.72 mgN/kg·d之间,水稻田土反硝化强度最大。总体上,研究对象的反硝化强度大于硝化强度,反硝化除氮能力强。研究结果对于评价河口潮间带地区沉积物及土壤的氮素转化能力有重要参考。
Abstract:
The sediments derived from the estuaries of four rivers flowing into the Liaodong Bay (Xiaoling River, Daling River, Shuangtaizi River, Liao River) and the soils derived from the paddy field, corn field and reed wetland near the Daling River were taken as the study targets and suspension culture method was used to determine the nitrification and denitrification potentials of the sediments and the nearby soils. The results showed that the nitrification potential of the sediments from four different estuaries ranged from 1.32 to 4.89 mgN/kg·d, with that of Xiaoling River the highest, followed by Shuangtaizi River, Liao River and Daling River in a descending order. The denitrification potential ranged from 5.44 to 10.47 mgN/kg·d, with that of Liao River the highest, followed by Shuantaizi River, Xiaoling River and Daling River in a descending order. The nitrification potential of the soils in different use near Daling River estuarine ranged from 1.32 to 2.92 mgN/kg·d, with that of the sediment the lowest. The denitrification potential of the soils ranged from 3.79 to 7.72 mgN/kg·d, with that of the paddy field the highest. Therefore, the denitrification potential was higher than the nitrification potential with strong ability of nitrogen removal and the study findings were useful for evaluation of nitrogen transformation in the sediments and soils in the estuarine intertidal areas.
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