要旨
发表于 2025-3-21 18:51:18
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SEVER
发表于 2025-3-21 22:46:12
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GLIDE
发表于 2025-3-22 02:40:25
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gnarled
发表于 2025-3-22 07:43:51
Contribution of photosynthetic sulphur bacteria to primary production in Lake Vechten area of 4.7 ha, a maximum depth of 11.9 m and a mean depth of 6 m..Bacterial populations, appearing at the boundary layer of the oxidative and reductive zone from early June till late October, were composed of cyanobacteria, Chromatiaceae and green and brown coloured Chlorobiaceae. Predominating ge
countenance
发表于 2025-3-22 09:26:19
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heirloom
发表于 2025-3-22 16:14:59
Structural and functional characteristics of epiphyton and epipelon in relation to their distributioerlands). On a weight basis, epiphyton was maximal in autumn and epipelon in summer. In winter the chemical composition of epiphyton and epipelon was similar. In summer the epiphyton had on a unit weight basis more organic matter and carbonate, and had per unit organic matter a higher algal number,
GUEER
发表于 2025-3-22 19:45:18
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HPA533
发表于 2025-3-22 23:08:48
The zooplankton: its community structure, food and feeding, and role in the ecosystem of Lake Vechteo the functioning of the lake’s ecosystem. The .C-technique used in the grazing and assimilation study is discussed in detail with a critical analysis of the methodological errors..The three major species which contributed to the annual density, biomass and grazing maxima in spring are: .. and .. Th
圆桶
发表于 2025-3-23 03:36:37
ng a country rich in water - at least in terms of surface area - and low-lying, problems related to water are as old as the nation itself. The problems in regard to water quality are becoming more acute and complicated due to the progressive rise in air and ground pollution. Glaring examples are the
我邪恶
发表于 2025-3-23 06:44:59
Book 1982ry rich in water - at least in terms of surface area - and low-lying, problems related to water are as old as the nation itself. The problems in regard to water quality are becoming more acute and complicated due to the progressive rise in air and ground pollution. Glaring examples are the acid rain