scholarly journals Nitrogen budgets for Scots pine and Norway spruce ecosystems 12 and 7 years after the end of long-term fertilisation

2007 ◽  
Vol 238 (1-3) ◽  
pp. 130-140 ◽  
Author(s):  
Svetlana Ladanai ◽  
Göran I. Ågren ◽  
Riitta Hyvönen ◽  
Helene Lundkvist
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Nitrogen Budgets

Do decomposing Scots pine, Norway spruce, and silver birch stems retain nitrogen?

2008 ◽  
Vol 38 (12) ◽  
pp. 3047-3055 ◽  
Author(s):  
Marjo Palviainen ◽  
Raija Laiho ◽  
Harri Mäkinen ◽  
Leena Finér
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Betula Pendula ◽  
Woody Debris ◽  
Nutrient Retention ◽  
Silver Birch ◽  
N Dynamics ◽  
Early Stages ◽  
N Pool

The contents of nitrogen (N) have generally been observed to increase in the early stages of decomposition in coarse woody debris and then to decrease slowly. This is potentially an important mechanism of nutrient retention in ecosystems after disturbances. We studied N dynamics in decomposing Scots pine ( Pinus sylvestris L.), Norway spruce ( Picea abies (L.) Karst.), and silver birch ( Betula pendula Roth.) stems in Finland. The oldest stems had decomposed for 34 (spruce and birch) or 45 (pine) years. Concentrations of N in both fallen logs and standing snags increased and C/N ratios decreased with time, and birch had significantly higher N concentrations and lower C/N ratios than pine and spruce. Even though increased N contents were observed in some cases, N was generally already released in the early stages of decomposition and more rapidly from birch than from conifers. Based on model analysis, from 40% (pine and spruce) to 50% (birch) of initial N was released within 30 years. The results suggest that decomposing stems of especially Scots pine and Norway spruce retain N rather effectively in boreal forest ecosystems and form a long-term, small but steady N pool with a slow release rate.

Growth responses following nitrogen and N–P–K–Mg additions to previously N-fertilized Scots pine and Norway spruce stands on mineral soils in Sweden

2001 ◽  
Vol 31 (5) ◽  
pp. 899-909 ◽  
Author(s):  
Staffan Jacobson ◽  
Folke Pettersson
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
N Fertilization ◽  
Nutrient Deficiencies ◽  
Growth Responses ◽  
Growth Increase ◽  
Spruce Stands ◽  
Fertilization Effect ◽  
Mineral Soils

To study growth responses to refertilization, 12 Scots pine (Pinus sylvestris L.) and 6 Norway spruce (Picea abies (L.) Karst.) stands used in long-term nitrogen (N) fertilization experiments were refertilized with N, either alone or with various combinations and doses of phosphorus (P), potassium (K), and magnesium (Mg). Many of the experimental plots had previously been subjected to heavy N fertilization regimes over a period of 20–30 years. On average, for all the experiments, the latest N addition resulted in a significant growth increase, corresponding to 57% of the mean annual volume increment and comparable with the response to the initial fertilization. Differences in growth response between fertilization with N alone or in combination with P–K–Mg were in most cases insignificant for both tree species. Overall, the joint addition of P–K–Mg resulted in a nonsignificant additional growth increase of 0.2 m3·ha–1·year–1, corresponding to 6% of the N fertilization effect. Repeated additions of N alone had no effect on the P, K, and Mg concentrations in current-year needles. It was concluded that the repeated N fertilizations did not cause any serious nutrient deficiencies.

Long-term responses of Scots pine and Norway spruce stands in Sweden to repeated fertilization and thinning

2014 ◽  
Vol 320 ◽  
pp. 118-128 ◽  
Author(s):  
Johan Bergh ◽  
Urban Nilsson ◽  
H.Lee Allen ◽  
Ulf Johansson ◽  
Nils Fahlvik
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Spruce Stands

Long-term exposure to enhanced UV-B radiation has no significant effects on growth or secondary compounds of outdoor-grown Scots pine and Norway spruce seedlings

2006 ◽  
Vol 144 (1) ◽  
pp. 166-171 ◽  
Author(s):  
Satu Turtola ◽  
Leena Sallas ◽  
Jarmo K. Holopainen ◽  
Riitta Julkunen-Tiitto ◽  
Pirjo Kainulainen
Keyword(s):  
Norway Spruce ◽  
Scots Pine ◽  
Secondary Compounds
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