Nitrogen and phosphorus in the sediments of Lake Rotorua

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Abstract
Kjeldahl N and total P concentrations were measured at .apprx. 1 cm depth intervals in 10 short sediment cores from Lake Rotorua. The concentrations, high at the surface and falling to a more constant value at about 20 cm below, did not vary significantly with the season of retrieval or with the siting of the core in the lake. Samples of sediments from Lake Rotoiti, and from below the layer of Rotomahana Mud (erupted from Mt. Tarawera in 1886) in Lake Rotorua, had consistently lower concentrations, possibly characterizing less eutrophic lake sources. An insignificant proportion of the N and P present in the sediments seems to be lost to the overlying lake water when it is O2-depleted during summer stratification.

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