Present status of submerged macrophyte growth in Lake Biwa: Recent recovery following a summer decline in the water level.
Present status of submerged macrophyte growth in Lake Biwa: Recent recovery following a summer decline in the water level.
复制标题
DOI：
10.1046/j.1440-1770.2002.00199.x
复制
发表时间：
2002-12-01
期刊：
影响因子：
--
通讯作者：
Kobayashi, Y.
中科院分区：
文献类型：
--
作者：
Hamabata, E.;Kobayashi, Y.
1994年和2000年，在干旱的夏季，琵琶湖的水位异常下降了约1米，利用航拍照片调查了琵琶湖淹没植物的全湖面积分布。估计沉水植物群落的总面积在1994年为1441公顷，在2000年为2825公顷。在南部浅水富营养化流域，植被覆盖的底部面积在1994年以后逐年增加，2000年占流域总面积的比例达到52%。优势种为两种本地种：水螅和细刺肉豆杉，以及一种外来种：密叶菊。讨论了与水位下降相关的物理条件和水质变化，以及沉水植物对水生环境和生态系统动力学的反应。
Whole-lake areal distribution of submerged macrophyte growth in Lake Biwa was surveyed using aerial photographs in 1994 and 2000, when unusual declines in the water level of approximately 1 m occurred in the dry summers. The estimated total areas of the submerged macrophyte communities were 1441 ha for 1994 and 2825 ha for 2000. In the shallow and eutrophic southern basin, the bottom area covered by vegetation gradually increased year by year after 1994, and the ratio of this area to the total surface area of the basin in 2000 amounted to 52%. The dominant species were two natives, Hydrilla verticillata and Myriophyllum spicatum, and one exotic, Egeria densa. Changes in physical conditions and water quality associated with the decline in the water level, as well as the reactions of submerged plants to aquatic environments and ecosystem dynamics, are discussed.