Assessing the impact of Diplocardia ornata on physical and chemical properties of compacted forest soil in microcosms |
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Authors: | F Ponder Jr Fumin Li Diann Jordan Edwin C Berry |
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Institution: | (1) 208 Foster Hall USDA Forest Service, Lincoln University, Jefferson City, MO 65102, USA e-mail: fponder@fs.fed.us Tel.: -573-6815575 Fax: -573-6815579, US;(2) Department of Agriculture, Food and Nutritional Sciences, University of Alberta, Edmonton, Alberta, T6G 2P5, Canada, CA;(3) Department of Soil and Atmospheric Science, The School of Natural Resources, University of Missouri, Columbia, MO 65211, USA, US;(4) Department of Entomology, Iowa State University, 13 Insectary Building, Ames, IA 50011-3140, USA, US |
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Abstract: | The influence of compaction on Diplocardia ornata (Smith) burrowing and casting activities, soil aggregation, and nutrient changes in a forest soil were investigated using
pot microcosms. Treatments included two levels each of compaction, organic matter, and earthworms. Both burrowing and casting
activities were more abundant in uncompacted soil than in compacted soil. Bulk density decreased in microcosms of compacted
soil containing D. ornata from 1.76 g cm–3 to 1.49 g cm–3 over the study period. The overall percent of aggregates in the same size classes in compacted soil was less than the percent
of aggregates in uncompacted soil. The mean percent of aggregates in earthworm casts for size classes 0.25–1.00 mm was higher
for compacted soil than for uncompacted soil. The reverse was true for aggregates in class sizes 2.00–4.00 mm. Soil compaction
also affected soil microbial biomass carbon and soil inorganic N concentrations. These results indicate that the burrowing
and casting activities of earthworms in compacted forest soils, as in soils of agricultural and pastured lands, can help ameliorate
disturbed soils by improving aggregation, reducing bulk density, and increasing nutrient availability.
Received: 1 September 1999 |
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Keywords: | Earthworms Aggregation Soil disturbance Bulk density Organic matter |
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