Bottom Deposits and Higher Aquatic Plants of Lake Yogo north of Lake Biwa
Bottom Deposits and Higher Aquatic Plants of Lake Yogo north of Lake Biwa
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琵琶湖以北余戈湖的底部沉积物和高等水生植物
DOI：
10.3739/rikusui.17.81
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发表时间：
1955
期刊：
影响因子：
--
通讯作者：
Hisanao Yamaguti
中科院分区：
文献类型：
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作者：
Hisanao Yamaguti
本文介绍了 1951 年 8 月在约戈湖进行的关于与高等水生植物的种类和分布有关的底部沉积物的性质和分布的调查结果。总共进行了 63 个收集站，并选择了其中 35 个来获取样本以进行底部沉积物分析（图 1）。几乎整个湖盆范围都覆盖着主要为软灰色软泥的底部沉积物，其中淤泥和粘土被限制在组成比例约为70%。高等水生植物垂直分布的下限在6.5m深度满足。它们在底部单位面积上的直立作物随深度或位置的不同而变化很大（表 2）。湖泊北部水深 2 至 2.5 m 之间的地层中植物生长最丰富，估计干重生物量最大为 467 g/m2，最小为 107 g/m2。植物的优势种是黑藻属和眼子菜属，它们都只生长在泥泞的底部。
This paper deals with the results of investigations made in Lake Yogo in August, 1951, on the nature and distribution of bottom deposits in relation to the kinds and distribution of higher aquatic plants.The number of stations at which the collections were made were 63 in total, and 35 of them were chosen in securing samples for the analyses of the bottom deposits (Map 1).Almost the whole extent of the lake basin is covered with the bottom deposits of mainly soft grey ooze in which silt and clay are confined to the ratio of about 70 % in composition.The lower limit of the vertical distribution of higher aquatic plants is met with at a depth of 6.5m. Their standing crop in a unit area of bottom varies widely with either depth or location (Table 2). The richest plant growths are observed in the northern part of the lake, at the strata between the depths from 2 to 2.5m, where the biomass in dry weight being estimated as 467 g/m2 in maximum and 107 g/m2 in minimum. The dominant species of plants are found in the genera Hydrilla and Potamogeton, both of which grow only on the muddy bottom.