The Pine Rockland forest originating from limestone substrates is listed as one of the most endan... more The Pine Rockland forest originating from limestone substrates is listed as one of the most endangered ecosystems in the United States, and has harbored the South Florida slash pine. Changes of fire regime and landscape fragmentation have caused a declination of Pine Rockland forest ecosystem. The objectives of this research were to (1) determine nutrient limitation and effects of prescribed fire on nutrient availability; (2) determine impacts of fire intensity and soil moisture on soil nutrient pools; and (3) predict availability of P after a fire. Results of analysis of foliar nutrient contents and DRIS indices indicated that P is the most limiting factor and potassium is the second limiting nutrient in the Pine Rockland forest; whereas, nitrogen is in marginal to limitation. Prescribed fire significantly increased soil pH, EC, and extractable P, Mg, K, Mn after 14 days, and extractable Fe and Ca in 270 and 360 days after the fire respectively, but not for extractable Cu and Zn. Soil NH 4 + pool significantly increased immediately after the fire, whereas the soil NO 3 pool was increased in post-fire 180 days. Fire intensity significantly decreased total contents of C, N, and K in residual ash, but not for total content of P, Ca, Mg, Fe, Mn, and Zn. The fire intensity significantly impacted soil pH,
The Pine Rockland forest originating from limestone substrates is listed as one of the most endan... more The Pine Rockland forest originating from limestone substrates is listed as one of the most endangered ecosystems in the United States, and has harbored the South Florida slash pine. Changes of fire regime and landscape fragmentation have caused a declination of Pine Rockland forest ecosystem. The objectives of this research were to (1) determine nutrient limitation and effects of prescribed fire on nutrient availability; (2) determine impacts of fire intensity and soil moisture on soil nutrient pools; and (3) predict availability of P after a fire. Results of analysis of foliar nutrient contents and DRIS indices indicated that P is the most limiting factor and potassium is the second limiting nutrient in the Pine Rockland forest; whereas, nitrogen is in marginal to limitation. Prescribed fire significantly increased soil pH, EC, and extractable P, Mg, K, Mn after 14 days, and extractable Fe and Ca in 270 and 360 days after the fire respectively, but not for extractable Cu and Zn. Soil NH 4 + pool significantly increased immediately after the fire, whereas the soil NO 3 pool was increased in post-fire 180 days. Fire intensity significantly decreased total contents of C, N, and K in residual ash, but not for total content of P, Ca, Mg, Fe, Mn, and Zn. The fire intensity significantly impacted soil pH,
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