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Rhizosphere Effects on Decomposition

Controls of Plant Species, Phenology, and Fertilization

^a Dep. of Environmental Studies, Univ. of California, Santa Cruz, CA 95064
^b Dep. of Environmental and Resource Sciences, Univ. of Nevada, Reno, NV 89557
^c Dep. of Nematology, Univ. of California, Davis, CA 95616

View larger version (42K): [in a new window]   Fig. 1. A plant growth apparatus and a closed-circulation CO2 trapping system.

View larger version (26K): [in a new window]   Fig. 2. Total belowground CO2 effluxes from no-plant (NP), soybean, and wheat treatments without NPK fertilization (F0), with a low level of NPK fertilization (F1), and with a high level of NPK fertilization (F2). Error bars are two standard errors, and some error bars are too small to be seen.

View larger version (24K): [in a new window]   Fig. 3. The 13C values of CO2 evolved from the no-plant control (thin solid lines), wheat (dotted lines), and soybean (thicker solid lines) treatments with three levels of fertilization (Zero NPK, square symbol; low NKP, circle symbol; high NPK, triangle symbol) and four sequential samplings. Error bars are two standard errors, and some error bars are too small to be seen.

View larger version (79K): [in a new window]   Fig. 4. Total soil inorganic C content (mg C g-1 soil) from the no-plant control, wheat, and soybean treatments without fertilization (Zero NPK) at the end of the experiment. Each error bar represents one standard error.

View larger version (20K): [in a new window]   Fig. 5. Soil-derived CO2 (mg C per pot d-1) from no-plant (top), wheat (middle), and soybean (bottom) treatments with three levels of fertilization (Zero NPK, square symbol; low NKP, circle symbol; high NPK, triangle symbol) and four sequential samplings. Error bars are two standard errors, and some error bars are too small to be seen.

View larger version (38K): [in a new window]   Fig. 6. Cumulative soil-derived CO2–C during the whole growing season calculated by using linear extrapolation. Filled bars, zero fertilization; open bars, low fertilization; and crossed bars, high fertilization. Setting the value for the no-plant treatment as 100%, the value for the soybean treatment is 275, 262, and 256% for zero, low, and high fertilization levels, respectively; and for the wheat treatment is 201, 186, and 201% for the three fertilization levels, respectively.