Skip to Main Content
Resource Utilization by Native and Invasive Earthworms and Their Effects on Soil Carbon and Nitrogen Dynamics in Puerto Rican SoilsAuthor(s): Ching-Yu Huang; Grizelle Gonzalez; Paul F. Hendrix
Publication Series: Scientific Journal (JRNL)
Station: International Institute of Tropical Forestry
Download Publication (730.0 KB)
DescriptionResource utilization by earthworms affects soil C and N dynamics and further colonization of invasive earthworms. By applying 13C-labeled Tabebuia heterophylla leaves and 15N-labeled Andropogon glomeratus grass, we investigated resource utilization by three earthworm species (invasive endogeic Pontoscolex corethrurus, native anecic Estherella sp, and native endogeic Onychochaeta borincana) and their effects on soil C and N dynamics in Puerto Rican soils in a 22-day laboratory experiment. Changes of 13C/C and 15N/N in soils, earthworms, and microbial populations were analyzed to evaluate resource utilization by earthworms and their influences on C and N dynamics. Estherella spp. utilized the 13C-labeled litter; however, its utilization on the 13C-labeled litter reduced when cultivated with P. corethrurus and O. borincana. Both P. corethrurus and O. borincana utilized the 13C-labeled litter and 15C-labeled grass roots and root exudates. Pontoscolex corethrurus facilitated soil respiration by stimulating 13C-labeled microbial activity; however, this effect was suppressed possibly due to the changes in the microbial activities or community when coexisting with O. borincana. Increased soil N mineralization by individual Estherella spp. and O. borincana was reduced in the mixed-species treatments. The rapid population growth of P. corethrurus may increase competition pressure on food resources on the local earthworm community. The relevance of resource availability to the population growth of P. corethrurus and its significance as an invasive species is a topic in need of future research.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationHuang, Ching-Yu; Gonzalez, Grizelle; Hendrix, Paul F. 2016. Resource Utilization by Native and Invasive Earthworms and Their Effects on Soil Carbon and Nitrogen Dynamics in Puerto Rican Soils. Forests, Vol. 7(11): 277-.
Keywordscarbon and nitrogen mineralization, invasive earthworms, Luquillo mountains, microbial respiration, Puerto Rico, stable isotope, tropics
- Potential Natural Vegetation Group: Palmetto Prairie
- Accelerating Planted Green Ash Establishment on an Abandoned Soybean Field
- Initial effects of prescribed fire on quality of soil solution and streamwater in the Southern Appalachian Mountains
XML: View XML