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10 March 2015 Long-term response of forest plantation productivity and soils to a single application of municipal biosolids
Rock Ouimet, Anne-Pascale Pion, Marc Hébert
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Abstract

Ouimet, R., Pion, A.-P. and Hébert, M. 2015. Long-term response of forest plantation productivity and soils to a single application of municipal biosolids. Can. J. Soil Sci. 95: 187-199. After 16 to 19 yr, we revisited four experimental trials set up in the early 1990s to evaluate the long-term impact of municipal biosolids applied in forest plantations. Tree growth and the soil were sampled to determine the effects of a single application of biosolids applied at (liquid equivalent) rates of 0, 130, 200, and 400 m3 ha-1. Tree radial growth responded markedly to biosolids in the young plantations, increasing from 18 % for Pinus resinosa to 62 % for Picea glauca, and up to 700 % for Quercus sp. Increases in phosphorus (P) concentrations in the tree foliage in response to biosolids could still be detected in the conifer trials. In the top 0-5 cm soil layer, organic carbon (C), total nitrogen (N), P, and copper (Cu) concentrations and pools increased, while soil compaction and bulk density decreased. In the deepest soil layer sampled (20-40 cm depth), the total N and calcium (Ca) pools were reduced by the biosolids treatments, while the pool of exchangeable acidity increased. Our observations indicate that a single application of liquid biosolids up to 400 m3 ha-1 (30 t ha-1 DM) in young forest plantations is a sustainable practice without undue risk to such podzolic soils.

Rock Ouimet, Anne-Pascale Pion, and Marc Hébert "Long-term response of forest plantation productivity and soils to a single application of municipal biosolids," Canadian Journal of Soil Science 95(2), 187-199, (10 March 2015). https://doi.org/10.1139/cjss-2014-048
Received: 20 May 2014; Accepted: 1 February 2015; Published: 10 March 2015
JOURNAL ARTICLE
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KEYWORDS
bilan de masse pédologique
biosolides municipaux
forest plantation
matiére organique du sol
Municipal biosolids
pedological mass balance
plantation forestiére
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