Van Dijk, G. M. and Achterberg, Eric P. (1992) Light climate in the water column of a shallow eutrophic lake (Lake Veluwe) in the Netherlands. Archiv für Hydrobiologie, 125 (3). pp. 257-278.

Text Arch._Hydrobiol._S.257-278.pdf - Published Version Restricted to Registered users only Download (8MB)

Abstract

In situ irradiance measurements were performed during 1986 and 1987, to obtain information on the nature of the light climate and on factors governing the absorption (a), scattering (b) and beam attenuation coefficient (c) in the water column of a shallow eutrophic lake (Lake Veluwe). Phytoplankton chlorophyll-a concentration ranged from 2 to 85 mg cntdot m-3, the seston concentration from 8 to 148 mg dry weight cntdot l-1 and gilvin concentration from 0.79 to 1.11 m-1 (g-440). The vertical attenuation coefficient (K-d) varied between 1.56 and 6.76 m-1. The relative effects of water itself, gilvin, phytoplankton, and tripton on a, b and c showed relatively small seasonal variation. The relative effects of water and gilvin on c were of minor importance (less than 10%). Phytoplankton contributed 6 to 20% to a, 3 to 33% (with a peak value of 55%) to b and less than 30% to c. Tripton was the dominant factor determining the diminution of irradiance penetrating the water column in Lake Veluwe. Irradiance was strongly scattered which was mainly due to tripton. The spectral distribution of the photosynthetically active radiation was progressively compressed with depth into a region between 550 and 700 nm. Water absorbed strongly in the red regions of the spectrum, and gilvin and seston in the blue regions. The seston concentration was positively correlated with wind-induced resuspension of bottom material. It was concluded that an improvement of the underwater light climate requires a reduction of resuspension of bottom particles.

Actions (login required)

View Item