580-9 Phosphorus Forms in Forest Soils Impacted by Prescribed Burning and Logging.

Poster Number 454

See more from this Division: S02 Soil Chemistry
See more from this Session: Oxyanions in Soil Environments: I (Posters)

Monday, 6 October 2008
George R. Brown Convention Center, Exhibit Hall E

Thilini Ranatunga, Department of Natural Resources and Environmental Science, Alabama A&M Univ., Normal, AL, Robert Taylor, Department of Natural Resources and Environmental Science, Alabama A&M University, Normal, AL and William Bleam, Department of Soil Science, University of Wisconsin-Madison, Madison, WI
Abstract:
Disturbances caused by fire and logging could affect the type of organic compounds of C, N, S, and P that prevails in the soil which determine important physical and chemical characteristics of forest soil. These changes can affect the availability of some nutrients to the forest biota of the eco-system. This study is focused on identifying the changes in P forms in forest soils impacted by prescribed fires and logging disturbances using chemical extractions and 31P NMR studies. Soils for this study were collected from Bankhead National Forest in Alabama subjected to several prescribed thinning and burning treatment cycles. Labile forms of organic P in surface soils were extracted with 0.5 M NaHCO3 while total organic P was extracted using NaOH/EDTA. Both extracts were analyzed using 31P NMR.  The data was compared with control soils to evaluate the impact of prescribed treatments on phosphorus forms in forest soil. Some differences were observed in P forms present in NaHCO3 and NaOH/EDTA extracts. Pyrophosphates and polyphosphates were detected in some of the NaHCO3 extracts. Pre-dominant organic P forms in the extracts consist of phosphate monoesters.

See more from this Division: S02 Soil Chemistry
See more from this Session: Oxyanions in Soil Environments: I (Posters)