Estimating fine-root production and turnover from biomass and decomposition data: a compartment-flow model

1988 ◽  
Vol 18 (5) ◽  
pp. 657-657
Author(s):  
D. Santantonio ◽  
J. C. Grace
Keyword(s):  
Flow Model ◽  
Fine Root ◽  
Root Production ◽  
Fine Root Production

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Estimating fine-root production and turnover from biomass and decomposition data: a compartment–flow model

1987 ◽  
Vol 17 (8) ◽  
pp. 900-908 ◽  
Author(s):  
D. Santantonio ◽  
J. C. Grace
Keyword(s):  
Soil Temperature ◽  
Fine Roots ◽  
Flow Model ◽  
Fine Root ◽  
Net Primary Production ◽  
Independent Set ◽  
Early Summer ◽  
Root Decomposition ◽  
Root Production ◽  
Fine Root Production

Production and replacement of fine roots (diam. < 1 mm) takes 8–67% of net primary production in forests. Most of this production is lost through mortality; little appears as an increment. Traditional biomass methods underestimate fine-root production because estimating production or mortality from changes in standing crop alone does not adequately account for simultaneous and compensating processes of growth, death, and replacement which occur continuously. We propose a compartment–flow model to solve this problem and estimate fine-root production and mortality at a monthly resolution for a pine plantation in New Zealand. The main component of the model is fine-root decomposition, an exponential decay function driven by soil temperature. The model "produces" and "turns over" enough fine roots to maintain observed standing crops of live and dead fine roots given losses through decomposition each month. We have formulated the model as differential and difference equations. Monthly estimates from the model indicated smooth modal patterns. Production and mortality peaked in early spring (September) at about 600 kg•ha−1•month−1 and fell to near zero in summer (January–February). The periodicity of these two processes was out of phase with soil temperature at 10 cm. Decomposition occurred continuously; it peaked in early summer (December) and declined to low levels during winter and was in phase with soil temperature. In a validation of the decomposition portion of the model with an independent set of decomposition data, measured standing crops of dead fine root were not statistically different from predicted values.

Heterorhizy can lead to underestimation of fine-root production when using mesh-based techniques

2014 ◽  
Vol 59 ◽  
pp. 84-90 ◽  
Author(s):  
A. Montagnoli ◽  
M. Terzaghi ◽  
G.S. Scippa ◽  
D. Chiatante
Keyword(s):  
Fine Root ◽  
Root Production ◽  
Fine Root Production

Fine root production and litter input: Its effects on soil carbon

2005 ◽  
Vol 272 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
L. B. Guo ◽  
M. J. Halliday ◽  
S. J. M. Siakimotu ◽  
R. M. Gifford
Keyword(s):  
Soil Carbon ◽  
Fine Root ◽  
Root Production ◽  
Fine Root Production ◽  
Litter Input

Fine root mass and fine root production in tropical moist forests as dependent on soil, climate, and elevation

2011 ◽  
pp. 428-444 ◽  
Author(s):  
D. Hertel ◽  
Ch. Leuschner ◽  
L. A. Bruijnzeel ◽  
F. N. Scatena ◽  
L. S. Hamilton
Keyword(s):  
Fine Root ◽  
Root Production ◽  
Fine Root Production ◽  
Root Mass ◽  
Soil Climate

scholarly journals Biomass Allocation to Resource Acquisition Compartments Is Affected by Tree Density Manipulation in European Beech after Three Decades

Forests ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 940
Author(s):  
Bohdan Konôpka ◽  
Milan Barna ◽  
Michal Bosela ◽  
Martin Lukac
Keyword(s):  
Fine Root ◽  
Standing Stock ◽  
European Beech ◽  
Forest Harvesting ◽  
Tree Density ◽  
Resource Acquisition ◽  
Root Turnover ◽  
Root Production ◽  
Fine Root Production ◽  
Mature Forest

This study reports on an investigation of fine root and foliage productivity in forest stands dominated by European beech (Fagus sylvatica L.) and exposed to contrasting intensities of mature forest harvesting. The main aim of this study was to consider the long-term effects of canopy manipulation on resource acquisition biomass compartments in beech. We made use of an experiment established in 1989, when five different light availability treatments were started in plots within a uniform forest stand, ranging from no reduction in tree density to full mature forest removal. We measured fine root standing stock in the 0–30 cm soil layer by coring in 2013 and then followed annual fine root production (in-growth cores) and foliage production (litter baskets) in 2013–2015. We found that the plot where the tree density was reduced by 30% had the lowest foliage and the highest fine root production. In 2013, this plot had the highest fine root turnover rate (0.8 year−1), while this indicator of fine root dynamics was much lower in the other four treatments (around 0.3 year−1). We also found that the annual fine root production represented around two thirds of annual foliage growth on the mass basis in all treatments. While our findings support the maintenance of source and sink balance in woody plants, we also found a long-lasting effect of tree density manipulation on investment into resource acquisition compartments in beech forests.

Analysis of some sources of error in methods used to determine fine root production in forest ecosystems: a simulation approach

1987 ◽  
Vol 17 (8) ◽  
pp. 909-912 ◽  
Author(s):  
W. A. Kurz ◽  
J. P. Kimmins
Keyword(s):  
Root Biomass ◽  
Fine Root ◽  
Sampling Error ◽  
Simulated Data ◽  
Sampling Interval ◽  
Fine Root Biomass ◽  
Root Production ◽  
Seasonal Patterns ◽  
Fine Root Production ◽  
True Value

Fine root production rates are most commonly calculated from periodic measurements of live and dead fine root biomass. The accuracy of production estimates based on this method is very sensitive to violations of the inherent assumptions, particularly the assumption that the processes of fine root production and mortality are temporally separate. A simple model was used to simulate data for a variety of seasonal patterns of live and dead fine root biomass. Fine root production and mortality rates were calculated from these simulated data using two different computational methods. Comparison of the calculated rates with the known rates (the rates used to generate the seasonal patterns) revealed that violations of the above assumptions can result in inaccurate rate estimates. When fine root production and mortality occur simultaneously within a sampling interval, the calculated production rate will greatly underestimate the true value. Additional error in the rate estimates may result from sampling error associated with the fine root biomass data. The model suggested that sampling error can cause either overestimation or underestimation of fine root production.

Relationships among litterfall, fine-root growth, and soil respiration for five tropical tree species

2007 ◽  
Vol 37 (10) ◽  
pp. 1954-1965 ◽  
Author(s):  
Oscar J. Valverde-Barrantes
Keyword(s):  
Soil Respiration ◽  
Root Growth ◽  
Tree Species ◽  
Fine Root ◽  
Tropical Tree ◽  
Root Production ◽  
Fine Root Production ◽  
Soil C ◽  
Tropical Tree Species ◽  
Fine Root Growth

Although significant advances have been made in understanding terrestrial carbon cycling, there is still a large uncertainty about the variability of carbon (C) fluxes at local scales. Using a carbon mass-balance approach, I investigated the relationships between fine detritus production and soil respiration for five tropical tree species established on 16-year-old plantations. Total fine detritus production ranged from 0.69 to 1.21 kg C·m–2·year–1 with significant differences among species but with no correlation between litterfall and fine-root growth. Soil CO2 emissions ranged from 1.61 to 2.36 kg C·m–2·year–1 with no significant differences among species. Soil respiration increased with fine-root production but not with litterfall, suggesting that soil C emissions may depend more on belowground inputs or that both fine root production and soil respiration are similarly influenced by an external factor. Estimates of root + rhizosphere respiration comprised 52% of total soil respiration on average, and there was no evidence that rhizosphere respiration was associated with fine-root growth rates among species. These results suggest that inherent differences in fine-root production among species, rather than differences in aboveground litterfall, might play a main role explaining local-scale, among-forest variations in soil C emissions.

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