Trophic interactions in soils as they affect energy and nutrient dynamics. IV. Flows of metabolic and biomass carbon |
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| Authors: | D C Coleman R V Anderson C V Cole E T Elliott L Woods M K Campion |
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| Institution: | (1) Natural Resource Ecology Laboratory and Department of Zoology and Entomology, Colorado State University, 80523 Fort Collins, Colorado;(2) Phosphorus Laboratory, USDA, Science and Education Administration, 80521 Fort Collins, Colorado;(3) Natural Resource Ecology Laboratory, Colorado State University, 80523 Fort Collins, Colorado;(4) Department of Agronomy, Colorado State University, 80523 Fort Collins, Colorado |
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| Abstract: | Flows of biomass and respiratory carbon were studied in a series of propylene-oxide sterilized soil microcosms. One-half of the microcosms received three pulsed additions of 200 ppm glucose-carbon to mimic rhizosphere carbon inputs. Biotic variables were: bacteria (Pseudomonas) alone, or amoebae (Acanthamoeba) and nematodes (Mesodiplogaster) singly, or both combined in the presence of bacteria.Over the 24-day experiment, respiration was significantly higher in the microcosms containing the bacterial grazers. Biomass accumulation by amoebae was significantly higher than that by nematodes. The nematodes respired up to 30-fold more CO2 per unit biomass than did amoebae. Similar amounts of carbon flowed into both respiratory and biomass carbon in microcosms with fauna, compared with the bacteria-alone microcosms. However, partitioning of available carbon by the microfauna varied considerably, with little biomass production and relatively more CO2-C produced in the nematode-containing microcosms. The amoebae, in contrast, allocated more carbon to tissue production (about 40% assimilation efficiency) and correspondingly less to CO2. |
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