The contribution of leaching to the rapid release of nutrients and carbon in the early decay of wetland vegetation
10.1007/s10750-006-0124-1 Cite this article as: Davis, S.E., Childers, D.L. & Noe, G.B. Hydrobiologia (2006) 569: 87. doi:10.1007/s10750-006-0124-1 Abstract
Our goal was to quantify the coupled process of litter turnover and leaching as a source of nutrients and fixed carbon in oligotrophic, nutrient-limited wetlands. We conducted poisoned and non-poisoned incubations of leaf material from four different perennial wetland plants (
Eleocharis spp., Cladium jamaicense, Rhizophora mangle and Spartina alterniflora) collected from different oligotrophic freshwater and estuarine wetland settings. Total phosphorus (TP) release from the P-limited Everglades plant species ( Eleocharis spp., C. jamaicense and R. mangle) was much lower than TP release by the salt marsh plant S. alterniflora from N-limited North Inlet (SC). For most species and sampling times, total organic carbon (TOC) and TP leaching losses were much greater in poisoned than non-poisoned treatments, likely as a result of epiphytic microbial activity. Therefore, a substantial portion of the C and P leached from these wetland plant species was bio-available to microbial communities. Even the microbes associated with S. alterniflora from N-limited North Inlet showed indications of P-limitation early in the leaching process, as P was removed from the water column. Leaves of R. mangle released much more TOC per gram of litter than the other species, likely contributing to the greater waterborne [DOC] observed by others in the mangrove ecotone of Everglades National Park. Between the two freshwater Everglades plants, C. jamaicense leached nearly twice as much P than Eleocharis spp. In scaling this to the landscape level, our observed leaching losses combined with higher litter production of C. jamaicense compared to Eleocharis spp. resulted in a substantially greater P leaching from plant litter to the water column and epiphytic microbes. In conclusion, leaching of fresh plant litter can be an important autochthonous source of nutrients in freshwater and estuarine wetland ecosystems. Keywords leaf decomposition organic carbon nitrogen phosphorus North Inlet Everglades References Aerts, R. 1996 Nutrient resorption from senescing leaves of perennials: are there general patterns? Journal of Ecology 84 597 608 CrossRef Amador, J. A., Jones, R. D. 1993 Nutrient limitations on microbial respiration in peat soils with different total phosphorus content Soil Biology and Biochemistry 25 793 801 CrossRef Benner, R., Peele, E. R., Hodson, R. E. 1986 Microbial utilization of dissolved organic matter from leaves of the red mangrove, Rhizophora mangle, in the Fresh Creek Estuary, Bahamas Estuarine, Coastal and Shelf Science 23 607 619 CrossRef
Childers, D. L., D. Iwaniec, D. Rondeau, G. Rubio, E. Verdon & C. Madden. Primary productivity in Everglades marshes demonstrates the sensitivity of oligotrophic ecosystems to environmental drivers. Aquatic Botany (in review).
Daoust, R. J., Childers, D. L. 2004 Ecological effects of low-level phosphorus additions on two plant communities in a neotropical freshwater wetland ecosystem Oecologia 141 672 686 PubMed CrossRef
Davis, S. M., 1989. Sawgrass and cattail production in relation to nutrient supply in the Everglades. In R. R. S. & J. W. Gibbons (eds), Freshwater Wetlands and Wildlife. US Department of Energy, Charleston, SC, 325–341.
Davis, S. M. 1991 Growth, decomposition, and nutrient retention in Cladium jamaicense Crantz and Typha domingensis Pers. in the Florida Everglades Aquatic Botany 40 203 224 CrossRef Davis, S. E., Coronado-Molina, C., Childers, D. L., Day, J. W., Jr. 2003 Temporally dependent C, N, and P dynamics associated with the decay of Rhizophora mangle L. leaf litter in oligotrophic mangrove wetlands of the southern Everglades Aquatic Botany 75 199 215 CrossRef Feller, I. C., Whigham, D., O’Neill, J., McKee, K. 1999 Effects of nutrient enrichment on within-stand cycling in a mangrove forest Ecology 80 2193 2205 CrossRef Gosselink, J. G., Kirby, C. J. 1974 Decomposition of salt marsh grass, Spartina alterniflora Loisel Limnology and Oceanography 19 825 832 Gosz, J. R., Likens, G. E., Borman, F. H. 1973 Nutrient release from decoposing leaf and branch litter in the Hubbard Brook Forest, New Hampshire Ecological Monographs 43 173 191 CrossRef Ibrahima, A., Joffre, R., Gillon, D. 1995 Changes in leaf litter during the initial leaching phase: an experiment on the leaf litter of Mediterranean species Soil Biology and Biochemistry 27 931 939 CrossRef Jaffé, R., Boyer, J. N., Lu, X., Maie, N., Yang, C., Scully, N. M., Mock, S. 2004 Source characterization of dissolved organic matter in a subtropical mangrove-dominated estuary by fluorescence analysis Marine Chemistry 84 195 210 CrossRef Killingbeck, K. T. 1996 Nutrients in senesced leaves: keys to the search for potential resorption and resorption proficiency Ecology 77 1716 1727 CrossRef Koch, M. S., Snedaker, S. C. 1997 Factors influencing Rhizophora mangle L. seedling development in Everglades carbonate soils Aquatic Botany 59 87 98 CrossRef Lu, X., Childers, D. L., Hanna, J. V., Maie, N., Jaffé, R. 2003 Molecular characterization of dissolved organic matter in freshwater wetlands of the Florida Everglades Water Research 37 2599 2606 PubMed CrossRef Maie, N., Yang, C., Miyoshi, T., Parish, K., Jaffe, R. 2005 Chemical characteristics of dissolved organic matter in an oligotrophic subtropical wetland/estuarine ecosystem Limnology and Oceanography 50 23 35 CrossRef Moran, M. A., Hodson, R. E. 1989 Bacterial secondary production on vascular plant detritus: relationships to detritus composition and degradation rate Applied Environmental Microbiology 55 2178 2189 Morris, J. T., Haskin, B. 1990 A 5-yr record of aerial primary production and stand characteristics of Spartina alterniflora Ecology 71 2209 2217 CrossRef
Noe, G. B. & D. L. Childers. Phosphorus budgets in Everglades wetland ecosystems: the effects of nutrient enrichment. Ecosystems (in review).
Noe, G. B., Childers, D. L., Jones, R. D. 2001 Phosphorus biogeochemistry and the impact of phosphorus enrichment: why is the Everglades so unique? Ecosystems 4 603 624 CrossRef Qualls, R. G., Richardson, C. J. 2000 P enrichment affects litter decomposition, immobilization, and soil microbial P in wetland mesocosms Soil Science Society of America Journal 64 799 808 CrossRef Richardson, C. J., Ferrell, G., Vaithiyanthan, P. 1999 Nutrient effects on stand structure, resorption efficiency, and secondary compounds in Everglades sawgrass Ecology 80 2182 2192 CrossRef Romero, L. M., Smith, T. J., Fourqurean, J. W. 2005 Changes in mass and nutrient content of wood during decomposition in a south Florida mangrove forest Journal of Ecology 93 618 631 CrossRef
Rubio, G. A. & D. L. Childers. Decomposition of
Cladium jamaicense, Eleocharis sp., and Juncus roemerianus in the estuarine ecotones of the Florida Everglades. Estuaries (in review). Solorzano, L., Sharp, J. H. 1980 Determination of total dissolved phosphorus and particulate phosphorus in natural waters Limnology and Oceanography 25 754 758 CrossRef Sundareshwar, P. V., Morris, J. T., Koepfler, E. K., Fornwalt, B. 2003 Phosphorus limitation of coastal ecosystem processes Science 299 563 565 PubMed CrossRef Swift, M. J., Heal, O. W., Anderson, J. M. 1979Decomposition in Terrestrial Ecosystems Blackwell Scientific Oxford, UK Taylor, B. R., Bärlocher, F. 1996 Variable effects of air-drying on leaching losses from tree leaf litter Hydrobiologia 325 173 182 CrossRef Teal, J. M. 1962 Energy flow in the salt marsh ecosystem of Georgia Ecology 43 614 624 CrossRef Tukey, H. B. 1970 The leaching of substances from plants Annual Review of Plant Physiology 21 305 324 CrossRef Webster, J. R., Benfield, E. F. 1986 Vascular plant breakdown in freshwater ecosystems Annual Review of Ecology and Systematics 17 567 594 CrossRef