By Stuart W. Pyhrr
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Extra info for European Helmets, 1450-1650
Makkonen and Helmisaari (1999) studied fine-root biomass growth with root ingrowth core method in a boreal forest. The ingrowth cores were initially without root biomass and 26 J. PUMPANEN et al. no levelling off in the biomass growth was found during the first three growing seasons. If installed very deeply in the soil, the collars may produce a similar effect. However, most of the damage may be mitigated by flat collars that have spikes to keep the collar grounded but do not trench the whole root system.
Bain, W. , Patterson, D. C. et al. (2005) Wind-induced error in the measurement of soil respiration using closed dynamic chambers. Agricultural and Forest Meteorology, 131, 225–32. Baldocchi, D. D. and Vogel, C. A. (1996) Energy and CO2 flux densities above and below a temperate broad-leaved forest and boreal pine forest. Tree Physiology, 16, 5–16. Black, T. , Neumann, H. H. et al. (1996) Annual cycles of water vapour and carbon dioxide fluxes in and above a boreal aspen forest. Global Change Biology, 2, 219–29.
1992) Comparison of static and dynamic closed chambers for measurement of soil respiration under field conditions. Canadian Journal of Soil Science, 72, 605–9. , Gregorich, E. G. et al. (1997) Description of a dynamic closed chamber for measuring soil respiration and its comparison with other techniques. Canadian Journal of Soil Science, 77, 195–203. Savage, K. E. and Davidson, E. A. (2003) A comparison of manual and automated systems for soil CO2 flux measurements: trade-offs between spatial and temporal resolution.
European Helmets, 1450-1650 by Stuart W. Pyhrr