Paper presented at the IUFRO Symposium “Intensive Forestry: The Role of Eucalypts”, held in Durban, South Africa, in September 1991

Use of Ecological Site Classification in the Prediction of Forest Productivity and Response to Fertilisation

Published in: South African Forestry Journal
Volume 160, issue 1, 1992 , pages: 19–23
DOI: 10.1080/00382167.1992.9630406
Author(s): Reid CarterForest Sciences Department, Canada, Karel KlinkaForest Sciences Department, Canada

Abstract

The principals of biogeoclimatic ecosystem classification were used to stratify sites supporting immature stands of coastal Douglas-fir. The resulting strata were shown to represent unique segments of regional gradients of available soil moisture and nutrients. Regression models indicated strong relationships between Douglas-fir site index (m/50 yr) and both indirect and direct measures of soil moisture and nutrient regimes (R2 >0,72; p >0,01). Third-year basal area response to fertilisation with nitrogen (225 kg N/ha; urea) varied significantly among site associations (R2 = 0,60; p >0,01). Site index also showed a significant relationship with third-year basal area response (R2 = 0,52; p >0,01) while the best predictive model included site associations and pretreatment foliar N and sulphate-S (R2 = 0,64; p >0,01).

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