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INTRODUCTIONAsasinkandaninnersourceofnutrients,sedimentsplayanimportantroleinlakeeutroph ication.TheeutrophicationstatusofWestLakeisstillcriticalinrecentyearsevenaftermostpollutionsourcesaroundWestLakehavebeencontrolled(Peietal.,1998) ,mainlythroughtherel… 相似文献
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Effects of pH and Eh on release of nitrogen and phosphorus from sediments of West Lake 总被引:1,自引:0,他引:1
The effects of pH and Eh on release of nitrogen and phosphorus from sediments of West Lake under different conditions were investigated by simulation test. Results showed that the net flux of NH4+-N release from sediments increased with pH, but NO3--N showed negative-going release at all tested pH levels. The net flux of NH4+-N release from sediments was higher under anaerobic or aerobic condition of the overlying water, but only under aerobic condition would net release of NO3--N occur. It was also shown that phosphorus released was mainly in its inorganic form, higher pH and anaerobic conditions of overlying water greatly stimulated release of phosphorus. In situ measurement at several West Lake locations indicated that sediment resuspension induced by boat propeller stimulated nutrients release from sediment into overlying water. 相似文献
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人工湿地基质中土壤酶空间分布及其与水质净化效果之间的相关性 总被引:14,自引:0,他引:14
人工湿地已被广泛用于处理各种类型的废水.研究了人工湿地基质中磷酸酶、脲酶和蛋白酶活性的空间分布规律及与污水净化效果之间的关系.磷酸酶和脲酶的活性随基质深度的增加而降低,蛋白酶活性在基质上层最高,下层次之,中层最低;湿地上池基质磷酸酶、脲酶和蛋白酶活性大于下池.磷酸酶活性与污水总磷、CODcr,BOD5除率正相关;脲酶与总氮的去除率正相关;蛋白酶与总氮、总磷、CODcr,BOD5去除率没有相关性.该研究为利用酶活性作为评价净化效果的指标提供了理论依据。 相似文献
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