New Zealand Journal of Marine and Freshwater Research abstracts

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Lake Tutira: the use of phosphorus loadings in a management study

R. H. S. McColl

Soil Bureau, Department of Scientific and Industrial Research, Private Bag, Lower Hutt, New Zealand

Abstract Decisions on lake management will often have to be made when data are scarce. However, a nutrient budget based on limited data of varying reliability and on information from the literature may help considerably. The 5-10 times reduction in phosphorus loading apparently required to achieve meso-trophic to oligotrophic conditions establishes the need for major changes in the catchment. The phosphorus budget helped in assessing the relative importances of the input streams and evaluating stream diversion proposals. It suggested that phosphorus inputs came mostly from animal excreta, soil erosion, and fertiliser, and it provided support for farm management proposals. When the results of stream diversion and altered land management are known the phosphorus budget may help in deciding the optimum land area needed to be converted from pasture into forest.

N.Z. Journal of Marine and Freshwater Research 12 (3) : 251-6. September 1978
Received 12 July 1977; revision received 23 November 1977. N.Z. Soil Bureau Publication 833

PDF file of entire paper: medium quality (488K); (scanned from paper original: notes about this process)

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