|Craft, C.B., and C.J. Richardson. 1998. Recent and long-term organic soil accretion and nutrient accumulation in the Everglades. Soil Science Society of America Journal 62:834-843.|
Abstract: Organic soil accretion and nutrient accumulation were measured in the northern, central, and southern Everglades to evaluate the effects of anthropogenic nutrient and hydroperiod alterations on organic C and nutrient storage during the past century six soil cores (euic, hyperthermic Typic Medisaprists) were collected from nutrient-enriched (Water Conservation Area [WCA] 2A) and unenriched locations. Soil depth increments were analyzed for radionuclides (137Cs, 210Pb, 14C), bulk density, and nutrients (C, N, P, S) to estimate recent (30-yr) and long-term (100-yr) organic soil accretion and nutrient accumulation. Since WCA 2A was completely impounded in the early 1960s, organic soil accretion in northern WCA 2A (5.8-6.7 mm yr1) increased by three to five times compared with before 1960 (1.9 mm yr1) or with unenriched areas within and outside of WCA 2A (1.4-1.6 mm yr1). Nutrient accumulation in the enriched area of WCA 2A since 1960 was two (184-223 g C m2 yr1, 13.6-16.6 g N m2 yr1) to eight (0.40-0.46 g P m2 yr1) times higher than before 1960 (110 g C m2 yr1, 6.6 g N m2 yr1, 0.06 g P m2 yr1) or in unenriched areas (65-90 g C m2 yr1, 4.7-6.4 g N m2 yr1, 0.06 g P m2 yr1). Unenriched areas of the Everglades possess some of the lowest rates of P accumulation of peatlands in North America. Successful restoration of the Everglades will have to include the elimination of anthropogenic nutrient loadings to limit the P enrichment zone from expanding into existing unenriched interior areas and areas downstream of WCA 2A.
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