Long-term effects of nitrogen fertilization on soil chemistry in three Scots pine stands in Sweden

2011 ◽  
Vol 41 (2) ◽  
pp. 279-288 ◽  
Author(s):  
Eva Ring ◽  
Staffan Jacobson ◽  
Lars Högbom
Keyword(s):  
Scots Pine ◽  
Nitrogen Fertilization ◽  
Boreal Forests ◽  
Soil Chemistry ◽  
Mineral Soil ◽  
Long Term Effects ◽  
Stem Wood ◽  
Mineral Soils ◽  
Major Nutrients

Adding nitrogen to coniferous forests on mineral soils will increase stem-wood growth in most boreal forests. The addition of nitrogen affects soils and waters as well. This investigation was conducted to evaluate the long-term effects of nitrogen fertilization at different intensities on soil chemistry in nitrogen-limited ecosystems. The study was performed at three experimental sites that were originally established around 1980 in Scots pine ( Pinus sylvestris L.) stands. Fertilization regimes with applications ranging from conceivable commercial rates to very intensive rates (3× 150 kg N·ha–1 up to 12× 150 kg N·ha–1) had been applied. Samples were collected from the FH horizon at all sites and 0–20 cm in the mineral soil at two sites and analyzed for pH and major nutrients. The carbon to nitrogen ratio in the FH horizon decreased with increasing total nitrogen application, while the concentrations and contents of nitrogen and exchangeable magnesium and phosphorus increased. The concentration and contents of exchangeable potassium decreased in both the FH horizon and the mineral soil. In general, larger effects on soil chemistry were observed with increasing fertilization intensity.

Long-term effects of clear-cutting on epigaeic beetle assemblages in boreal forests

2016 ◽  
Vol 359 ◽  
pp. 65-73 ◽  
Author(s):  
Therese Johansson ◽  
Joakim Hjältén ◽  
Jörgen Olsson ◽  
Mats Dynesius ◽  
Jean-Michel Roberge
Keyword(s):  
Boreal Forests ◽  
Long Term Effects ◽  
Clear Cutting ◽  
Beetle Assemblages

scholarly journals Boreal-forest soil chemistry drives soil organic carbon bioreactivity along a 314-year fire chronosequence

SOIL ◽  
2020 ◽  
Vol 6 (1) ◽  
pp. 195-213
Author(s):  
Benjamin Andrieux ◽  
David Paré ◽  
Julien Beguin ◽  
Pierre Grondin ◽  
Yves Bergeron
Keyword(s):  
Organic Carbon ◽  
Indirect Effect ◽  
Soil Chemistry ◽  
Mineral Soil ◽  
Chemical Properties ◽  
Soil C ◽  
C Pools ◽  
Time Since Fire ◽  
C Stock

Abstract. Following a wildfire, organic carbon (C) accumulates in boreal-forest soils. The long-term patterns of accumulation as well as the mechanisms responsible for continuous soil C stabilization or sequestration are poorly known. We evaluated post-fire C stock changes in functional reservoirs (bioreactive and recalcitrant) using the proportion of C mineralized in CO2 by microbes in a long-term lab incubation, as well as the proportion of C resistant to acid hydrolysis. We found that all soil C pools increased linearly with the time since fire. The bioreactive and acid-insoluble soil C pools increased at a rate of 0.02 and 0.12 MgC ha−1 yr−1, respectively, and their proportions relative to total soil C stock remained constant with the time since fire (8 % and 46 %, respectively). We quantified direct and indirect causal relationships among variables and C bioreactivity to disentangle the relative contribution of climate, moss dominance, soil particle size distribution and soil chemical properties (pH, exchangeable manganese and aluminum, and metal oxides) to the variation structure of in vitro soil C bioreactivity. Our analyses showed that the chemical properties of podzolic soils that characterize the study area were the best predictors of soil C bioreactivity. For the O layer, pH and exchangeable manganese were the most important (model-averaged estimator for both of 0.34) factors directly related to soil organic C bioreactivity, followed by the time since fire (0.24), moss dominance (0.08), and climate and texture (0 for both). For the mineral soil, exchangeable aluminum was the most important factor (model-averaged estimator of −0.32), followed by metal oxide (−0.27), pH (−0.25), the time since fire (0.05), climate and texture (∼0 for both). Of the four climate factors examined in this study (i.e., mean annual temperature, growing degree-days above 5 ∘C, mean annual precipitation and water balance) only those related to water availability – and not to temperature – had an indirect effect (O layer) or a marginal indirect effect (mineral soil) on soil C bioreactivity. Given that predictions of the impact of climate change on soil C balance are strongly linked to the size and the bioreactivity of soil C pools, our study stresses the need to include the direct effects of soil chemistry and the indirect effects of climate and soil texture on soil organic matter decomposition in Earth system models to forecast the response of boreal soils to global warming.

Long-term effects of nitrogen fertilization on aggregation and localization of carbon, nitrogen and microbial activities in soil

2018 ◽  
Vol 624 ◽  
pp. 1131-1139 ◽  
Author(s):  
Yidong Wang ◽  
Zhong-Liang Wang ◽  
Qingzhong Zhang ◽  
Ning Hu ◽  
Zhongfang Li ◽  
...  
Keyword(s):  
Nitrogen Fertilization ◽  
Microbial Activities ◽  
Long Term Effects

Long-term effects of forest liming on mineral soil, organic layer and foliage chemistry: Insights from multiple beech experimental sites in Northern France

2018 ◽  
Vol 409 ◽  
pp. 872-889 ◽  
Author(s):  
Mélanie Court ◽  
Gregory van der Heijden ◽  
Serge Didier ◽  
Claude Nys ◽  
Claudine Richter ◽  
...  
Keyword(s):  
Mineral Soil ◽  
Organic Layer ◽  
Long Term Effects ◽  
Northern France ◽  
Soil Organic Layer ◽  
Forest Liming ◽  
Foliage Chemistry

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.

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