湿地中碱性磷酸酶的动力学特征与水生植物的关系  

Relationship Between the Kinetics of Alkaline Phosphatase and Aquatic Plants in Wetlands

作　　者：周易勇[1] 李建秋[1] 张敏[1] 

机构地区：[1]中国科学院水生生物研究所,武汉430072

出　　处：《湖泊科学》2002年第2期134-138,共5页Journal of Lake Sciences

基　　金：国家自然科学基金 (2 0 1770 33;396 70 14 9;39170 16 5 );淡水生态与生物技术国家重点实验室基金;中国科学院东湖湖泊生态系统试验站基金;中国科学院长春地理研究所现代湿地过程与环境开放实验室基金;中国科学院"青年科学家小组"基金联合资助项目

摘　　要：本文讨论了种植菹草 (PotamogetoncrispusL .)、水花生 (AlternanthearphiloxeroidesGriseb .)、紫背浮萍 (Spirodelapolyrhiza(L .)Schleid .)以及对照实验池 (12 .5m× 9.5m)过滤 (小于0 4 5 μm)与未过滤水样和沉积物中碱性磷酸酶的动力学特征及其分布 .水生植被能降低水样和表层沉积物酶的催化效率 ,抑制作用因植物的种类而异 ,且在未过滤水中表现得尤为突出 .因此 ,受抑制者多与较大的颗粒相联系 ,这一结果暗示植物克藻效应的胞外酶学机制 .水生植物种植区表层沉积物的低酶活性是其中有机磷不易矿化故得以保持从而改善水质的可能原因 ,而深层沉积物酶的反应速度则明显高于对照 .Kinetics and distributions of alkaline phosphatase in water, natural and filtered (<0 45μm), coupled with sediment, in constructed wetland (12.5m×9.5m) inhabited by Potamogeton crispus L., Alternanthear philoxeroides Griseb. and Spirodela polyrhiza L. respectively, were determined. The plants inactivated the enzyme, in kinetic sense, in surficial sediment and water, depending on species. The inactivation was most obvious in unfiltered water samples implying an enzymatic mechanism explaining the plant algae interaction. In sediments covered by rooted plants, the enzymatic activity was lower in surficial layers, leading a nutrient retention and water quality amelioration, but significantly higher in the relatively deeper layers. The complexity of subsurface in wetland sediment deserves further study, which is of great theoretical and practical significance.

关 键 词：湿地 碱性磷酸酶 动力学特征 水生植物 

分 类 号：Q178.1[生物学—水生生物学]