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Separating Soil Respiration into Plant and Soil Components Using Analyses of the Natural Abundance of Carbon-13

^a Agriculture and Agri-Food Canada, Soils and Crops Research and Development Centre, 2560 Hochelaga Blvd., Ste-Foy, QC, Canada G1V 2J3
^b Dep. of Biological Sciences, Univ. of Lethbridge, 4401 University Dr., Lethbridge, AB, Canada, T1K 3M4
^c Agriculture and Agri-Food Canada, Eastern Cereal and Oilseed Research Centre, Neatby Bldg., Central Experimental Farm, Ottawa, ON, Canada, K1A 0C6

View larger version (22K): [in a new window]   Fig. 1 (a) Total soil respiration (Rt); (b) soil temperature, and (c) soil moisture at 20 cm in maize and control plots during the 1996 growing season. Vertical bars indicate ± SD

View larger version (15K): [in a new window]   Fig. 2 Total soil respiration (Rt) response to soil temperature (Ts) at the 10-cm depth in maize and control plots during the 1996 growing season. Open squares indicate measurements made in the maize plot before Day 184 when plants were small; these data points were not used to calculate the Rt–Ts relationship in the maize plot

View larger version (25K): [in a new window]   Fig. 3 Seasonal variation in the C isotopic ratio (13C) of soil CO2 at three depths in maize and control plots during the 1996 growing season. Vertical bars indicate ± SD

View larger version (16K): [in a new window]   Fig. 4 Contribution of maize rhizosphere respiration (Rrh) to total respiration (Rt) in a maize crop during the 1996 growing season

View larger version (20K): [in a new window]   Fig. 5 Total soil (Rt), rhizosphere (Rrh), and soil (Rs) respiration in a maize crop during the 1996 growing season. Estimates of Rrh were obtained by the 13C isotopic technique (Rrh,iso) and the root-exclusion technique (Rrh,excl). Vertical bars indicate ± SD

View larger version (10K): [in a new window]   Fig. 6 Response of the rate of oxidation of soil C (Rs) to soil temperature (Ts) at the 10-cm depth in the maize plot during the 1996 growing season