Forest floor and mineral soil respiration rates in a northern Minnesota red pine chronosequence

Forests
By: , and 

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Abstract

We measured total soil CO2 efflux (RS) and efflux from the forest floor layers (RFF) in red pine (Pinus resinosaAit.) stands of different ages to examine relationships between stand age and belowground C cycling. Soil temperature and RS were often lower in a 31-year-old stand (Y31) than in 9-year-old (Y9), 61-year-old (Y61), or 123-year-old (Y123) stands. This pattern was most apparent during warm summer months, but there were no consistent differences in RFF among different-aged stands. RFF represented an average of 4–13% of total soil respiration, and forest floor removal increased moisture content in the mineral soil. We found no evidence of an age effect on the temperature sensitivity of RS, but respiration rates in Y61 and Y123 were less sensitive to low soil moisture than RS in Y9 and Y31. Our results suggest that soil respiration’s sensitivity to soil moisture may change more over the course of stand development than its sensitivity to soil temperature in red pine, and that management activities that alter landscape-scale age distributions in red pine forests could have significant impacts on rates of soil CO2 efflux from this forest type.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Forest floor and mineral soil respiration rates in a northern Minnesota red pine chronosequence
Series title Forests
DOI 10.3390/f9010016
Volume 9
Issue 1
Year Published 2018
Language English
Publisher MDPI
Contributing office(s) Southwest Biological Science Center
Description Article 16; 15 p.
First page 1
Last page 15