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首页> 外文期刊>Lakes & Reservoirs >Present status of submerged macrophyte growth in Lake Biwa: Recent recovery following a summer decline in the water level
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Present status of submerged macrophyte growth in Lake Biwa: Recent recovery following a summer decline in the water level

机译：琵琶湖淹没植物的生长现状：夏季水位下降后最近的恢复

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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 vertidllata 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.
机译：1994年和2000年，通过航空照片对琵琶湖淹没植物的整个湖面分布进行了调查，当时在干燥的夏季，水位异常下降约1 m。据估计，淹没的植物群落的总面积在1994年为1441公顷，在2000年为2825公顷。在浅水和富营养化的南部盆地，植被覆盖的底部面积在1994年后逐年逐渐增加，该面积与植被的比例成正比。 2000年流域总表面积达52％。优势种是两个本地人，Hydrilla vertidllata和Myriophyllum spicatum，以及一个外来物种，Egeria densa。讨论了与水位下降有关的物理条件和水质变化，以及淹没植物对水生环境和生态系统动态的反应。

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