| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Wetland Biogeochemistry Lab., Soil and Water Science Dep., 106 Newell Hall, Univ. of Florida, Gainesville, FL 32611 USA
krr{at}gnv.ifas.ufl.edu
There have been recent concerns about the anthropogenic phosphorus (P) loading to the naturally oligotrophic Everglades ecosystem. We investigated the effect of P loading on the biogeochemical cycling of nitrogen (N). We investigated the distribution of the potentially mineralizable N (PMN) rate as an indicator of the influence of P loading on selected microbial activities in soil and detritus layers. Soil characteristics measured included bulk density; total C, N, and P; microbial biomass C; and N and extractable NH+4. PMN rates ranged from 10.4 to 325 mg N kg-1 d-1. The highest values of microbial biomass C and N, total P, extractable NH+4, and PMN were observed in the detrital layer, and rates decreased with increasing soil depth. An increase in the size of the microbial pool and heterotrophic activity (organic N mineralization) was found to be related to the P-loading rate and related to the distribution of total P content in the soil and detrital layers. Extractable NH+4 was a good indicator of PMN rates and total P was found to be significantly correlated to microbial biomass C and N. The stimulatory effect of P enrichment on microbial activity, overall size of the microbial biomass pool, and the PMN rate has led to an increased availability of inorganic N, which could potentially affect macrophyte growth and water quality of the northern Everglades system.
Abbreviations: CFE, chloroform-fumigation extraction • PMN, potentially mineralizable nitrogen • SINM, substrate induced nitrogen mineralization, SFWMD, south Florida water management district • SOC, soil organic carbon • WCA-2A, Water Conservation Area-2A
This article has been cited by other articles:
|
|
 |
|
  C. B. Pandey, R. C. Srivastava, and R. K. Singh Soil Nitrogen Mineralization and Microbial Biomass Relation, and Nitrogen Conservation in Humid-Tropics Soil Sci. Soc. Am. J., May 13, 2009; 73(4): 1142 - 1149. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. M. Malecki-Brown and J. R. White Effect of Aluminum-Containing Amendments on Phosphorus Sequestration of Wastewater Treatment Wetland Soil Soil Sci. Soc. Am. J., May 1, 2009; 73(3): 852 - 861. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Ruehlmann and M. Korschens Calculating the Effect of Soil Organic Matter Concentration on Soil Bulk Density Soil Sci. Soc. Am. J., April 21, 2009; 73(3): 876 - 885. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. A. Belmont, J. R. White, and K. R. Reddy Phosphorus Sorption and Potential Phosphorus Storage in Sediments of Lake Istokpoga and the Upper Chain of Lakes, Florida, USA J. Environ. Qual., March 25, 2009; 38(3): 987 - 996. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Grunwald and K. R. Reddy Spatial Behavior of Phosphorus and Nitrogen in a Subtropical Wetland Soil Sci. Soc. Am. J., June 18, 2008; 72(4): 1174 - 1183. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. L. Wright and K. R. Reddy Substrate-Induced Respiration for Phosphorus-Enriched and Oligotrophic Peat Soils in an Everglades Wetland Soil Sci. Soc. Am. J., August 9, 2007; 71(5): 1579 - 1583. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. M. Bostic and J. R. White Soil Phosphorus and Vegetation Influence on Wetland Phosphorus Release after Simulated Drought Soil Sci. Soc. Am. J., January 1, 2007; 71(1): 238 - 244. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. R. White, K. R. Reddy, and J. Majer-Newman Hydrologic and Vegetation Effects on Water Column Phosphorus in Wetland Mesocosms Soil Sci. Soc. Am. J., May 23, 2006; 70(4): 1242 - 1251. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. Grunwald, R. Corstanje, B. E. Weinrich, and K. R. Reddy Spatial Patterns of Labile Forms of Phosphorus in a Subtropical Wetland J. Environ. Qual., January 5, 2006; 35(1): 378 - 389. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Cohen, J. P. Prenger, and W. F. DeBusk Visible-Near Infrared Reflectance Spectroscopy for Rapid, Nondestructive Assessment of Wetland Soil Quality J. Environ. Qual., July 5, 2005; 34(4): 1422 - 1434. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. P. Prenger and K. R. Reddy Microbial Enzyme Activities in a Freshwater Marsh after Cessation of Nutrient Loading Soil Sci. Soc. Am. J., September 1, 2004; 68(5): 1796 - 1804. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. R. White and K. R. Reddy Nitrification and Denitrification Rates of Everglades Wetland Soils along a Phosphorus-Impacted Gradient J. Environ. Qual., November 1, 2003; 32(6): 2436 - 2443. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
W.F. DeBusk, S. Newman, and K.R. Reddy Spatio-Temporal Patterns of Soil Phosphorus Enrichment in Everglades Water Conservation Area 2A J. Environ. Qual., July 1, 2001; 30(4): 1438 - 1446. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J.R. White and K.R. Reddy Influence of Selected Inorganic Electron Acceptors on Organic Nitrogen Mineralization in Everglades Soils Soil Sci. Soc. Am. J., May 1, 2001; 65(3): 941 - 948. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Journal of Natural Resources and Life Sciences Education |
Vadose Zone Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
