老江河水生植被

AQUATIC VEGETATIOH IN LAOJIANGHE LAKE

于１９９１年－１９９４年对老江河水生植被进行了研究。老江河现有水生植物１７科２１属２７种，优势种为苦草、黑藻、竹叶眼子菜和菹草。水生植被呈不规则环带状分布，可划分为挺水、浮叶、沉水３个植物带和９个植物群丛。水生植被动态是芦苇、聚草、大茨藻、小茨藻群落扩大，莲、菱、苦草、黑藻、竹叶眼子菜、金鱼藻群落缩小，槐叶萍、满江红、菰等其它植物群落变化不大。从水生生态学角度对合理利用老江河水生植物资源进行了探讨。

Aquatic vegetation in Laojianghe lake was investigated in 1991-1994.The results showed that the aquatic flora in the lake covered 17 families,21 genus, 27 species. It was found that Vallisneria spirallis, Hydrilla verticillata, Potamogeton malaianus and Potamogeton crispus were dominant species.The distribution of aquatic vegetation was irregular zonations,and could be divided into 3 zones of vegetation (emergent vegetation, leaf-floating vegetation and submerged vegetation) from shore to center of the lake and 9 main community types. The trends of aquatic flora were that the communities of Phragmites communis, Myriphyllum spicatum, Najas marina and Najas minor became larger, the communities of Nelumbo nucifera, Trapa bispinosa, Vallisneria spiralis, Hydrilla verticillata, Potamogeton malaianus and Ceratophyllum demersum became smaller, the communities of Salvinia natans, Azolla imbricata, Zizania latifolia etc. changed litter. Basing on the viewpoint of lake ecology, this paper also emphasized the importance of the submerged vegetation resources and made some suggestion on fishery development in this lake.