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Seasonal changes in biomass and vertical distribution of mycorrhizal and fibrous textured conifer fine roots in 23 year old and 180 year old subalpine abies amabilis stands


Seasonal changes in biomass and vertical distribution of mycorrhizal and fibrous textured conifer fine roots in 23 year old and 180 year old subalpine abies amabilis stands



Canadian Journal of Forest Research 11(2): 223-229



ISSN/ISBN: 0045-5067

Seasonal changes in bomass and vertical distribution of fibrous, mycorrizal and total conifer fine roots (.ltoreq. 2 mm) were examined in 23- and 180-yr-old Pacific silver fir (A. amabilis (Dougl.) Forbes) ecosystems. In both stands, > 80% of fine roots was located in the upper 15 cm of the soil profile, in the forest floor (O1 and O2) and A horizon. During periods of active root growth in the young stand, significantly higher conifer root biomass occurred in the A horizon (370-690 g/m2) than the forest floor (200-350 g/m2). At all sampling times a significantly higher biomass of conifer fine roots was located in the forest floor (550-1090 g/m2) than the A horizon (290-640 g/m2) in the old stand. In both stands, mycorrhizal roots comprised 10-15% of the total weight of conifer fine roots during peak root growth. 2-6% when roots were not growing and 21-29% during the winter and early spring when roots were growing. Up to 69% of the biomass of fibrous and mycorrhizal roots was located in the forest floor in both stands.

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Accession: 006371473

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Related references

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