Logging residue removal after thinning in Nordic boreal forests: Long-term impact on tree growth

Abstract The aim of this study was to determine the effect of whole-tree harvesting (WTH) on the growth of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) as compared to conventional stem harvesting (CH) over 10 and 20 years. Compensatory (WTH + CoF) and normal nitrogen-based (CH + F or WTH + F) fertilisation were also studied. A series of 22 field experiments were established during 1977–1987, representing a range of site types and climatic conditions in Finland, Norway and Sweden. The treatments were performed at the time of establishment and were repeated after 10–13 years at 11 experimental sites. Seven experiments were followed for 25 years. Volume increment was on average significantly lower after WTH than after CH in both 10-year periods in the spruce stands. In the pine stands thinned only once, the WTH induced growth reduction was significant during the second 10-year period, indicating a long-term response. Volume increment of pine stands was 4 and 8% and that of spruce stands 5 and 13% lower on the WTH plots than on CH during the first and the second 10-year period, respectively. For the second 10-year period the relative volume increment of the whole-tree harvested plots tended to be negatively correlated with the amount of logging residue. Accordingly, the relative volume increment decreased more, the more logging residue was harvested, stressing the importance of developing methods for leaving the nutrient-rich needles on site. If nutrient (N, P, K) losses with the removed logging residues were compensated with fertiliser (WTH + CoF), the volume increment was equal to that in the CH plots. Nitrogen (150–180 kg ha−1) or N + P fertilisation increased tree growth in all experiments except in one very productive spruce stand. Pine stands fertilised only once had a normal positive growth response during the first 10-year period, on average 13 m3 ha−1, followed by a negative response of 5 m3 ha−1 during the second 10-year period. The fertilisation effect of WTH + F and WTH + CoF on basal area increment was both smaller and shorter than with CH + F.

[1]  G. Egnell,et al.  Effects of different levels of biomass removal in thinning on short‐term production of pinus sylvestris and picea abies stands , 1997 .

[2]  V. Kitunen,et al.  Response of litter decomposition and soil C and N transformations in a Norway spruce thinning stand to removal of logging residue , 2008 .

[3]  Pekka Nöjd,et al.  Fluxes of dissolved organic and inorganic nitrogen in relation to stand characteristics and latitude in Scots pine and Norway spruce stands in Finland , 2008 .

[4]  G. Egnell.  Is the productivity decline in Norway spruce following whole-tree harvesting in the final felling in boreal Sweden permanent or temporary? , 2011 .

[5]  A. Saarsalmi,et al.  Forest Fertilization Research in Finland: A Literature Review , 2001 .

[6]  O. Hendrickson,et al.  Nutrient cycling following whole-tree and conventional harvest in northern mixed forest , 1989 .

[7]  P. Curtis,et al.  Effects of Forest Management on Soil C and N Storage: Meta Analysis , 2001 .

[8]  H. Nohrstedt.  Response of Coniferous Forest Ecosystems on Mineral Soils to Nutrient Additions: A Review of Swedish Experiences , 2001 .

[9]  H. Helmisaari,et al.  Nutrient retranslocation in three Pinus sylvestris stands , 1992 .

[10]  O. Rosenberg,et al.  Effects of repeated slash removal in thinned stands on soil chemistry and understorey vegetation , 2004 .

[11]  Nutrient cycling in Pinus sylvestris stands in eastern Finland , 1995 .

[12]  Charles Smith,et al.  Environmental factors in woodfuel production: Opportunities, risks, and criteria and indicators for sustainable practices , 2009 .

[13]  E. Malkonen.  Annual primary production and nutrient cycle in some Scots pine stands , 1974 .

[14]  Jan Bengtsson,et al.  Carbon and nitrogen in coniferous forest soils after clear-felling and harvests of different intensity , 1996 .

[15]  M. Kukkola,et al.  Impact of whole-tree harvesting and compensatory fertilization on growth of coniferous thinning stands , 2000 .

[16]  T. Nord‐Larsen.  Stand and site productivity response following whole-tree harvesting in early thinnings of Norway spruce (Picea abies (L.) Karst.) , 2002 .

[17]  P. Tamminen,et al.  Removal of logging residue in Norway spruce thinning stands: long-term changes in organic layer properties. , 2010 .

[18]  P. Nilsen.  Fertilization Experiments on Forest Mineral Soils: A Review of the Norwegian Results , 2001 .

[19]  N. Clarke,et al.  Effects Of Very Intensive Forest Biomass Harvesting On Short And Long Term Site Productivity , 2008 .

[20]  E. Mälkönen.  Effect of whole-tree harvesting on soil fertility. , 1976 .

[21]  P. Tamminen,et al.  Logging residue removal after thinning in boreal forests: long-term impact on the nutrient status of Norway spruce and Scots pine needles. , 2010, Tree physiology.

[22]  Ståle Størdal,et al.  Bioenergi i Norge – potensialer, markeder og virkemidler , 2007 .

[23]  J. Saramäki,et al.  Growth response in repeatedly fertilized pine and spruce stands on mineral soils. , 1983 .

[24]  Pekka Nöjd,et al.  Fine root biomass in relation to site and stand characteristics in Norway spruce and Scots pine stands. , 2007, Tree physiology.

[25]  A. Wall.  Effect of removal of logging residue on nutrient leaching and nutrient pools in the soil after clearcutting in a Norway spruce stand , 2008 .

[26]  H. Tuomenvirta,et al.  climatological characteristics of summer precipitation in helsinki during the period 1951 – 2000 , 2008 .

[27]  Bengt A. Olsson,et al.  Decomposition and nutrient release from Picea abies (L.) Karst. and Pinus sylvestris L. logging residues , 2000 .

[28]  A. Cajander,et al.  Forest types and their significance. , 1949 .

[29]  M. Kukkola,et al.  Growth response of coniferous stands to whole-tree harvesting in early thinnings. , 1996 .