Effect of repeated fertilization on stem growth in old stands of Pinus sylvestris in South East Norway

O. Haveraaen and L.H. Frivold
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O. Haveraaen: Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
L.H. Frivold: Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway

Journal of Forest Science, 2015, vol. 61, issue 2, 72-79

Abstract: We studied effects of repeated applications of nitrogen on stem growth of mature Scots pine at four sites with yield potential around 3 - 4.5 m3 ha‑1 yr‑1. Treatments included control (0) and fertilization with ammonium nitrate at 100 and 200 kg N ha‑1. Some plots were supplied with corresponding doses of urea. Applications were repeated up to five times, at five to twenty years intervals. Plot size was 22 x 22 m with buffer zones of 4 m. Measurements were made on an inner plot, 14 x 14 m. Tree ring widths usually reached a maximum two to four years after fertilization, returning to about the original level after seven to ten years. Responses were larger to 200 than to 100 kg N ha‑1. Annual volume increment over the experimental period was 1.5 to 2.0 m3 ha-1 larger in plots provided with 200 kg N ha-1 than in control plots, or even more as the buffer zones of 4 m did not completely exclude tree roots from growing into neighbouring plots.

Keywords: nitrogen; Scots pine; tree ring widths; volume increment (search for similar items in EconPapers)
Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnljfs:v:61:y:2015:i:2:id:110-2014-jfs

DOI: 10.17221/110/2014-JFS

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