摘要:
关键词: 洪湖；沉积物；营养盐；内源释放
Abstract: The paper introduces the distribution features of nutrient salts in the sediments of Honghu Lake and its incoming rivers, as well as their release potentials. Contents of total nitrogen (TN), ammonia nitrogen (NH4+-N), total phosphorus (TP), and labile phosphorus in the sediments from different areas and different depths were measured respectively. The results show that TN and TP concentrations in the sediments were at serious pollution levels. TN content in the river sediments is lower than that from the lake, while the opposite was true for TP. TN pollution is the most serious in the southern and northeastern districts of the lake as well as in the middle and upper reaches of the river. TP concentration is low in the central part but high in the northern and southern parts of the lake. The static release of NH4+-N from the Honghu Lake sediments is about 192.4 t/a, and the dynamic release ranges from 51.18 ~ 259.69 t/time. Static release of Labile-P is about 3.37 t/a, and dynamic release is 18.80 ~ 46.58 t/time. Dynamic release of TN is 162.44 ~ 1243.34 t/time, and 40.89 ~ 64.54 t/time for TP.
Keywords: Honghu Lake; sediment; nutrient salt; endogenous release
介绍了洪湖及主要入湖河流沉积物中营养盐分布特征和释放潜力，分别测定不同区域不同深度沉积物中总氮（TN）、氨氮（NH4+-N）、总磷（TP）、易释放态磷（Labile-P）的含量。结果表明： 沉积物中TN和TP浓度均处于严重污染水平，河流沉积物中的TN含量低于湖泊，而TP则相反；TN污染在湖泊南部、东北部区以及河流中上游最为严重，而TP仅在湖泊中呈中部低、南北高的特征；洪湖沉积物NH4+-N静态释放量约为192.4 t/a，动态释放量为51.18 ~ 259.69 t/次；Labile-P静态释放量约为3.37 t/a，动态释放量为18.80 ~46.58 t/次；TN动态释放量为162.44 ~1243.34 t/次，TP动态释放量为40.89 ~64.54 t/次。
关键词: 洪湖；沉积物；营养盐；内源释放
Abstract: The paper introduces the distribution features of nutrient salts in the sediments of Honghu Lake and its incoming rivers, as well as their release potentials. Contents of total nitrogen (TN), ammonia nitrogen (NH4+-N), total phosphorus (TP), and labile phosphorus in the sediments from different areas and different depths were measured respectively. The results show that TN and TP concentrations in the sediments were at serious pollution levels. TN content in the river sediments is lower than that from the lake, while the opposite was true for TP. TN pollution is the most serious in the southern and northeastern districts of the lake as well as in the middle and upper reaches of the river. TP concentration is low in the central part but high in the northern and southern parts of the lake. The static release of NH4+-N from the Honghu Lake sediments is about 192.4 t/a, and the dynamic release ranges from 51.18 ~ 259.69 t/time. Static release of Labile-P is about 3.37 t/a, and dynamic release is 18.80 ~ 46.58 t/time. Dynamic release of TN is 162.44 ~ 1243.34 t/time, and 40.89 ~ 64.54 t/time for TP.
Keywords: Honghu Lake; sediment; nutrient salt; endogenous release