Carbon and nitrogen turnover in the early stage of Scots pine (Pinus sylvestris L.) needle litter decomposition: effects of internal and external nitrogen

2001 ◽  
Vol 33 (4-5) ◽  
pp. 465-474 ◽  
Author(s):  
L.S Vestgarden
Keyword(s):  
Pinus Sylvestris ◽  
Litter Decomposition ◽  
Scots Pine ◽  
Early Stage ◽  
Carbon And Nitrogen ◽  
Nitrogen Turnover ◽  
Needle Litter

Dynamics of nitrogen (15N) in decomposing Scots pine (Pinus sylvestris) needle litter. Long-term decomposition in a Scots pine forest. VI

1988 ◽  
Vol 66 (8) ◽  
pp. 1539-1546 ◽  
Author(s):  
Björn Berg
Keyword(s):  
Pinus Sylvestris ◽  
Total Nitrogen ◽  
Scots Pine ◽  
Field Experiments ◽  
Early Stage ◽  
Fulvic Acids ◽  
Insoluble Fraction ◽  
Decomposition Process ◽  
Needle Litter ◽  
Scots Pine Forest

Labelled (15N) Scots pine (Pinus sylvestris L.) needle litter was incubated in one laboratory and two field experiments and the nitrogen dynamics was followed during the decomposition process. Release of the litter's original nitrogen began immediately after the start of the decomposition process. Simultaneously an immobilization of nitrogen to the litter took place. Very little of the actual turnover of nitrogen in the litter, which was considerable, was reflected by the dynamics of total nitrogen. The dynamics of nitrogen in the lignin fraction (acid-insoluble substance) was partly different from that of whole litter. The dynamics of total nitrogen coincided so that a net loss of total nitrogen started simultaneously both in whole litter and in the acid-insoluble fraction. As the amount of acid-insoluble substance increased in the early stage, the amount of 15N associated to this fraction increased and when a net disappearance of acid-insoluble substance started, a net release of 15N from this fraction started simultaneously. This was interpreted to mean that some of the litter's own nitrogen was transformed into compounds that could be incorporated into humic and fulvic acids (e.g., NH3 or amino acids), which were analytically recorded as acid-insoluble substance.

Initial rates and limit values for decomposition of Scots pine and Norway spruce needle litter: a synthesis for N-fertilized forest stands

2000 ◽  
Vol 30 (1) ◽  
pp. 122-135 ◽  
Author(s):  
Björn Berg
Keyword(s):  
Picea Abies ◽  
Pinus Sylvestris ◽  
Norway Spruce ◽  
Scots Pine ◽  
Nitrogen Fertilization ◽  
N Fertilization ◽  
Simple Equation ◽  
Forest Stands ◽  
Limit Values ◽  
Needle Litter

Nitrogen fertilization increased concentrations of N, P, S, and K in Scots pine (Pinus sylvestris L.) needle litter, and in those of N, S, and Ca in Norway spruce (Picea abies (L.) Karst.). Lignin concentrations increased for both species. Initial rates and limit values for decomposition were estimated using a simple equation. For Scots pine litter, initial rates ranged between 0.0618 and 0.2986%/day with P, K, N, and Mg being positively related, but lignin and Ca negatively related. For Norway spruce, initial rates were low (0.0455-0.1007%/day) and positively related with initial concentrations of water solubles, K, and P but negatively with N, Ca, and lignin. Limit values for Scots pine litter ranged from 53.1 to 94.3% decomposition in fertilized plots and from 71.5 to 93.2% in controls. They were negatively related to N concentrations and positively to Mn and Ca. Limit values for Norway spruce litter ranged from 53.8 to 74.3% in controls and from 48 to 71.3% in fertilized plots and were positively correlated to Mn and Ca but not to N. The paper concludes that N fertilization will increase the fraction of Scots pine litter that accumulates as humus but not for Norway spruce.

Sign in / Sign up

Export Citation Format

Share Document