NDLI: Soil carbon and nitrogen dynamics in Lumbricus terrestris. L. middens in four arable, a pasture, and a forest ecosystems

Content Provider	Springer Nature Link
Author	Wilcox, C. Domínguez, J. Parmelee, R. McCartney, D.
Copyright Year	2002
Abstract	Lumbricus terrestris' middens contain large concentrations of organic material and have been characterized as microenvironments distinct from the surrounding soil. The direct and indirect consequences of midden formation on nutrient cycling dynamics and organic matter pools in various ecosystem types have not received much consideration. Therefore, we focused on the differences in C and N dynamics between midden and bulk soil samples in four corn (Zea mays L.) agroecosystems, a rotational pasture and a deciduous forest, in June, July and August of 1996, in Ohio, USA. Paired earthworm midden and bulk soil samples were analyzed for mineral N (NH4+-N and NO3–-N), dissolved organic N, microbial biomass N (MBN) and carbohydrate C (CarbC). Additionally, coarse litter, fine litter, particulate organic matter, and soil organic matter fractions were separated and analyzed for total C, total N and C:N ratios. Mineral and dissolved N levels were higher in the midden soil relative to those in the bulk soil for all ecosystem types, except for only NO3–-N levels in two highly fertilized agroecosystems and in the pasture. MBN, CarbC, and total C and N levels for all organic fractions were significantly greater in the earthworm midden samples relative to these in the bulk samples across all ecosystem types. The plan defined by principal component analysis clearly separated two main groups: (1) includes the forest, the pasture and the less fertilized cornfields and the midden effect is to increase slightly the organic matter content and strongly the inorganic N content, and (2) includes the heavily fertilized agroecosystems and the midden effect is also to increase the organic matter content but to decrease the inorganic N content. We concluded that L. terrestris' middens significantly raised overall soil C and N levels relative to the bulk soil, in a variety of ecosystem types, and, given the abundance of earthworm middens, these macrosites should receive important attention when evaluating nutrient cycling processes at the systems level.
Starting Page	26
Ending Page	34
Page Count	9
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	36
Issue Number	1
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-07-10
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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