Lignin and holocellulose relations during long-term decomposition of some forest litters. Long-term decomposition in a Scots pine forest. IV

1984 ◽  
Vol 62 (12) ◽  
pp. 2540-2550 ◽  
Author(s):  
Bjorn Berg ◽  
Gunnar Ekbohm ◽  
Charles McClaugherty
Keyword(s):  
United States ◽  
Scots Pine ◽  
Field Experiments ◽  
The United States ◽  
Pine Forest ◽  
Chemical Components ◽  
Asymptotic Value ◽  
Asymptotic Values ◽  
Scots Pine Forest

We investigated the relative changes in celluloses and lignin during decomposition of leaf and needle litters and wood in field experiments. The litter came from two different forest systems: one in the United States and one in Sweden. We found that the fraction of holocellulose in the total lignocellulose (Q) during decomposition approached an asymptotic value at which the disappearance of both the chemical components proceeded at the same rate. Different litter types approached different asymptotic values of Q. Possible implications of the finding are discussed.

scholarly journals Plasticity of Fine-Root Traits Under Long-Term Irrigation of a Water-Limited Scots Pine Forest

2019 ◽  
Vol 10 ◽  
Author(s):  
Ivano Brunner ◽  
Claude Herzog ◽  
Lucía Galiano ◽  
Arthur Gessler
Keyword(s):  
Scots Pine ◽  
Fine Root ◽  
Root Traits ◽  
Pine Forest ◽  
Scots Pine Forest

Decomposition of needle litter and its organic chemical components: theory and field experiments. Long-term decomposition in a Scots pine forest. III

1984 ◽  
Vol 62 (12) ◽  
pp. 2880-2888 ◽  
Author(s):  
Björn Berg ◽  
Göran I. Ågren
Keyword(s):  
Chemical Composition ◽  
Mass Loss ◽  
Scots Pine ◽  
Field Experiments ◽  
Average Rate ◽  
Chemical Components ◽  
Organic Chemical ◽  
Labile Fraction ◽  
Lignin Fraction ◽  
Scots Pine Forest

Scots pine needles were collected and field incubations were begun in the autumn of 6 consecutive years. The incubated needles were sampled three times a year and analysed for mass loss and chemical composition. The longest incubation time obtained was 1825 days. Four series of needles from a nutrition experiment (three levels of nutrient application and one control) sampled at one occasion were followed in the same way for 1448 days. The logarithm of remaining mass versus time of the pooled samples fits a linear regression well (average rate constant = 0.286 year−1, r2 = 0.963, n = 75). A higher resolution shows, however, that the decay rate decreases with time as the chemical composition changes. To better understand the decomposition process we have formulated a mathematical model for the course of mass loss as a system consisting of two fractions, a readily decomposable (labile) one and a refractory one. The mass loss from the two fractions can be direct or mass can be transferred from the refractory to the labile fraction. The model allows us to calculate the variation of the refractory fraction with time (generally there will always be some labile material in the system) and the decrease of the decomposition rate as a function of time or as a function of the concentration of the refractory fraction. We have found it possible to identify the refractory fraction both as the lignin fraction and as the nonsoluble fraction of the needles. The first identification yields a long transient response, whereas the second gives a system rapidly reaching a steady state. In both cases, the decay of the refractory material results in transfer of material to the labile fraction.

scholarly journals Lessons learned from a long‐term irrigation experiment in a dry Scots pine forest: Impacts on traits and functioning

2022 ◽  
Author(s):  
Arun K. Bose ◽  
Andreas Rigling ◽  
Arthur Gessler ◽  
Frank Hagedorn ◽  
Ivano Brunner ◽  
...  
Keyword(s):  
Scots Pine ◽  
Pine Forest ◽  
Lessons Learned ◽  
Scots Pine Forest

Accumulation and release of plant nutrients in decomposing Scots pine needle litter. Long-term decomposition in a Scots pine forest II

1982 ◽  
Vol 60 (8) ◽  
pp. 1561-1568 ◽  
Author(s):  
Håkan Staaf ◽  
Björn Berg
Keyword(s):  
Weight Loss ◽  
Scots Pine ◽  
Nutrient Dynamics ◽  
Pine Forest ◽  
Plant Nutrient ◽  
Pine Needle ◽  
Needle Litter ◽  
Scots Pine Forest ◽  
Net Release

Plant nutrient dynamics in decomposing needle litter were measured during a 5-year period in a Scots pine forest in central Sweden. As seen over the whole 5-year period, the nutrients were retained (to a litter weight loss of about 75%) in the order Mn < Ca < K < Mg < S < N < P. During the first 1.5 years there was a net increase of N and P whereafter a net release took place. A similar but less pronounced development could be seen for S, whereas Ca, K, Mn, and Mg were released from the start of the incubation. It is suggested that P was the most limiting element for microbial activity during this first phase. There appeared to be only little initial leaching from the litter and the different behaviours of the elements could largely be explained by their concentration in litter in relation to the needs of microorganisms and to their solubility. K and Mg were the elements that were released at rates most similar to organic matter weight loss.

Changes in organic chemical components of needle litter during decomposition. Long-term decomposition in a Scots pine forest. I

1982 ◽  
Vol 60 (8) ◽  
pp. 1310-1319 ◽  
Author(s):  
Björn Berg ◽  
Kai Hannus ◽  
Thomas Popoff ◽  
Olof Theander
Keyword(s):  
Scots Pine ◽  
Chemical Components ◽  
Organic Chemical ◽  
Pinus Silvestris ◽  
Steryl Esters ◽  
Needle Litter ◽  
Field Incubation ◽  
Scots Pine Forest ◽  
Soluble Components

The decomposition and organic chemical changes in Scots pine (Pinus silvestris) needle litter were studied for a period of 5 years and until 75% weight loss was reached in field incubation. The changes in components such as various groups of lipophilic extractives, low-molecular carbohydrates, cyclitols, phenolic glycosides, polysaccarides, and lignin were followed. There was a great drop of sugars, steryl esters, and triglycerides during the 1st year of decomposition. Some isoprenoid alcohols, sterols, and some acids belonged to the most stable of the soluble components. Of the solid residue the arabinans decomposed rapidly, the cellulose decomposed somewhat faster than the hemicelluloses as a group, and the lignin decomposed rather slowly (about 48% in 5 years).

scholarly journals Which Selective Logging Intensity is Most Suitable for the Maintenance of Soil Properties and the Promotion of Natural Regeneration in Highly Continental Scots Pine Forests?–Results 19 Years after Harvest Operations in Mongolia

Forests ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 141 ◽  
Author(s):  
Gerelbaatar Sukhbaatar ◽  
Baatarbileg Nachin ◽  
Battulga Purevragchaa ◽  
Batsaikhan Ganbaatar ◽  
Khishigjargal Mookhor ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Properties ◽  
Total Nitrogen ◽  
Scots Pine ◽  
Natural Regeneration ◽  
Pine Forest ◽  
Selective Logging ◽  
Forest Steppe ◽  
Scots Pine Forest

Scots pine (Pinus sylvestris L.) forests are one of the main vegetation types in the Asian forest-steppe zone. However, over-harvesting currently threatens the natural regeneration and sustainability of these forests. In this study, we examine the long-term effects of different logging intensities on soil properties and natural regeneration in a natural Scots pine forest in the West Khentii Mountains (Mongolia), 19 years after selective logging. Our experimental design included five treatments: clear cut (CC), treatments with high (HI), medium (MI), low (LI) intensities, and a reference parcel with no logging impact at all (RE). We described and quantified the harvest events and applied ANOVA and LMM modeling to analyze and explain the long-term impacts of the logging intensities on soil properties and natural regeneration. We found that logging has a significant negative influence on the physical and chemical properties of the soil because it increases soil compaction and reduces soil nutrients. The most critical impacts of logging were on soil bulk density, total porosity, organic matter, and total nitrogen and phosphorus. The LMM modeling showed that organic matter (OgM), total nitrogen (TN), available K (AK) and pH values are especially impacted by logging. Our study revealed that the values for all of these variables show a linear decrease with increasing selective logging intensity and have a level of significance of p < 0.05. Another finding of this study is that selective logging with low and medium intensities can promote natural regeneration of Scots pine to numbers above those of the reference site (RE). High intensity logging and clear-cuts, however, limit the regeneration of Scots pine, reduce overall seedling numbers (p < 0.05), and create conditions that are suitable only for the regeneration of deciduous tree species. This underlines the risk of Scots pine forest degradation, either by replacement by broad-leaf trees or by conversion into non-forest ecosystems.

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