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- Title
Breakdown rates and associated nutrient cycling vary between novel crop-derived and natural riparian detritus in aquatic agroecosystems.
- Authors
Taylor, Jason M.; Lizotte, Richard E.; Testa, Sam
- Abstract
Freshwater ecosystem function within agricultural landscapes may be altered by differences in processing of organic matter (OM) detritus entering freshwater habitats. We compared litter breakdown rates between crop residues; maize, cotton and soybean, and native riparian species: willow oak, American sycamore and cottonwood from inundated remnant river meander channels located within the Lower Mississippi River Basin (LMRB). Litter breakdown varied among the six species with the highest and lowest breakdown rates represented by crop (X¯k day−1 = 0.007-0.011) and riparian species (X¯k day−1 = 0.003-0.005), respectively. OM nutrient concentration varied widely across the six species. OM C:N ratios declined with time for all species except cotton. Temporal patterns in C:P ratios varied among crop residues but initially increased before declining for all three riparian species. Riparian OM breakdown rates were more negatively related to increasing C:N ratios of OM at the end of the study compared to crop species. Historic shifts in landscape-scale OM sources from diverse bottomland tree assemblages to crop residues has likely altered LMRB bayou and oxbow ecosystems by shifting both the timing and lability of OM pulses and decreasing long-term storage of OM, an important habitat and food resource for aquatic communities.
- Subjects
RIPARIAN ecology; AGRICULTURAL ecology; ORGANIC compounds; FRESHWATER habitats; CROP residues
- Publication
Hydrobiologia, 2019, Vol 827, Issue 1, p211
- ISSN
0018-8158
- Publication type
Article
- DOI
10.1007/s10750-018-3766-x