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A perfusive method combined with an open-system carbon dioxide measurement system was used to assess rhizosphere respiration of  Acer saccharum  Marsh. (sugar maple) and  Betula alleghaniensis  Britton (yellow birch) seedlings grown in 8-l pots filled with coarse sand. We compared in vivo and in situ rhizosphere respiration between species, among light regimes (40, 17 and 6% of full daylight) and at different times during the day. To compute specific rhizosphere respiration, temperature corrections were made with either species-specific coefficients ( Q  10 ) based on the observed change in respiration rate between 15 and 21 °C or an arbitrarily assigned  Q  10  of 2. Estimated, species-specific  Q  10  values were 3.0 and 3.4 for  A. saccharum  and  B. alleghaniensis , respectively, and did not vary with light regime. Using either method of temperature correction, specific rhizosphere respiration did not differ either between  A. saccharum  and  B. alleghaniensis , or among light regimes except in  A. saccharum  at 6% of full daylight. At this irradiance, seedlings were smaller than in the other light treatments, with a larger fine root fraction of total root dry mass, resulting in higher respiration rates. Specific rhizosphere respiration was significantly higher during the afternoon than at other times of day when temperature-corrected on the basis of an arbitrary  Q  10  of 2, suggesting the possibility of diurnal variation in a temperature-independent component of rhizosphere respiration.

In vivo and in situ rhizosphere respiration in Acer saccharum and Betula alleghaniensis seedlings grown in contrasting light regimes