New Zealand Journal of Marine and Freshwater Research abstracts

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Distribution of plant nutrients in the Kaituna River

E. White

B. Don

M. T. Bownes

L. Kemp

Freshwater Section, Ecology Division, DSIR, P.O. Box 415, Taupo, New Zealand

Abstract The distribution of phosphorus and inorganic nitrogen in the Kaituna River and some of its inputs was examined during 1975. Under low flow conditions about 60 kg.d"¹ of phosphorus enters the top of the river from Lake Rotoiti. The discharge to the sea, some 50 km downstream, approximates 300 kg.d"¹, about 77 kg.d"¹ of this total coming from the Auckland Farmers' Freezing Company works at Rangiuru. By the year 2000 an additional 107 kg.d"¹ of phosphorus may be added to the top of the river in treated sewage effluent from Rotorua city. Inorganic nitrogen concentrations increase along the length of the river; about 40 kg.d"¹ enter the top at Okere Falls and under low flow conditions about 950 kg.d"¹ discharge to the sea. By the year 2000 the river may be carrying an additional 1000 kg.d"¹ of nitrogen derived from Rotorua's treated sewage. The effect of the additional nutrient load on the trophic status of the river is likely to be slight, because water passes from Okere to the sea in about a day.

N.Z. Journal of Marine and Freshwater Research 12 (7) : 23-7. March 1978
Received 18 November 1976; revision received 23 August 1977.

PDF file of entire paper: medium quality (338K); (scanned from paper original: notes about this process)

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