Spatial distribution of submerged macrophytes in the south basin of Lake Biwa in the summer of 2012, compared with 2002 and 2007.

Q4 Environmental Science

Japanese Journal of Limnology Pub Date : 2013-01-01 DOI:10.3739/rikusui.75.107

H. Haga, K. Ishikawa

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引用次数: 3

Abstract

The spatial distribution of submerged macrophytes, in terms of biomass and species composition, was surveyed in the south basin of Lake Biwa in September, 2012 using scuba. Submerged macrophytes were observed in 48 out of 52 sampling stations, and 12 species were found in this study. The number of species of submerged macrophytes per site was 4 . 6 ± 2 . 0 . The area with vegetation cover and the total biomass ( dry weight ) during the study period were estimated to be 47 . 6 km 2 and 3264 ± 1445 t, respectively. Although the area with vegetation cover was only 1 km 2 less than in 2007 , total biomass of submerged macrophytes declined by 6360 t during the same period. Biomass of Potamogeton maackianus , Egeria densa , and Ceratophyllum demersum decreased signifi cantly between 2007 and 2012 ( paired Student 2007 and 2012 ( paired Students t -test, P < 0 . 05 , n = 52 ) , 4107 t, 879 t, and 804 t, respectively. Biomass reduction in these three species accounted for 91 % of the entire reduction. The biomasses of the other species also declined, with excepthion of two, Potamogeton malaianus and P. anguillanus

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2012年夏季琵琶湖南部盆地淹没植物空间分布与2002年和2007年的比较

2012年9月，利用水肺对琵琶湖南盆水下大型植物的生物量和种类组成进行了调查。52个采样点中有48个观测到沉水植物，共发现12种。每个立地淹没植物种数为4种。6±2。０．研究期间植被覆盖面积和总生物量(干重)为47。分别为6km²和3264±1445 t。虽然植被覆盖面积仅比2007年减少了1 km2，但淹没植物总生物量同期减少了6360 t。2007 - 2012年，马氏马铃薯、密植玉米和长尾角藻生物量显著下降(配对Student 2007和2012)(配对Student t检验，P < 0。05, n = 52)， 4107 t, 879 t, 804 t。这三个物种的生物量减少占总减少量的91%。除malaianus和P. anguillanus两个物种外，其他物种的生物量也有所下降

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来源期刊

Japanese Journal of Limnology Environmental Science-Ecology

CiteScore

0.20

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0.00%

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期刊介绍： The Japanese Society of Limnology was founded in 1931 for the purpose of promoting and fostering the study of limnology in the broad meaning of the term. It publishes quarterly "The Japanese Journal of Limnology" and holds an annual meeting consisting of lectures, discussions and symposiums on limnological subjects.