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Phosphorus Enrichment Affects Litter Decomposition, Immobilization, and Soil Microbial Phosphorus in Wetland Mesocosms

^a Dept. of Environmental and Resource Sciences, MS 370, University of Nevada, Reno, NV 89557 USA
^b Duke Wetland Center, Duke University, Durham, NC 27708 USA

View larger version (17K): [in a new window]   Fig. 1 Percentage of initial C remaining after 1 yr of decomposition of (a) sawgrass and (b) cattail litter as a function of average PO4–P in the water column in 5 experimental channels at each of two sites. Each data point represents one litter bag sample

View larger version (12K): [in a new window]   Fig. 2 Percentage of initial C remaining during 1 yr of decomposition of sawgrass litter in channels receiving either the highest level of P enrichment or no P enrichment. Data points represent individual litter bags, while lines indicate averages of data points taken from a particular channel

View larger version (13K): [in a new window]   Fig. 3 Fraction of initial P remaining during 1 yr of decomposition of sawgrass litter in channels receiving either the highest level of P enrichment or no P enrichment. Data points represent individual litter bags, while lines indicate averages of data points taken from a particular channel

View larger version (14K): [in a new window]   Fig. 4 Percentage of initial N remaining during 1 yr of decomposition of sawgrass litter in channels receiving either the highest level of P enrichment or no P enrichment. Data points represent individual litter bags, while lines indicate averages of data points taken from a particular channel

View larger version (13K): [in a new window]   Fig. 5 Percentage of initial Cu remaining during 1 yr of decomposition of sawgrass litter in channels receiving either the highest level of P enrichment or no P enrichment. Data points represent individual litter bags, while lines indicate averages of data points taken from a particular channel

View larger version (27K): [in a new window]   Fig. 6 Percentage of initial P remaining after 1 yr of decomposition of sawgrass and cattail litter as a function of average PO4–P in the water column in five experimental channels at each of two sites. Each data point represents one litterbag sample

View larger version (24K): [in a new window]   Fig. 7 (a) Chloroform-released P and (b) exchangeable PO4–P in the soil of channels receiving inputs of either no P, the intermediate P level, or the highest P level. Solid points represent Site 1 and hollow points represent Site 2. Lines connect the average of the values for the two sites. Points are plotted for the 0- to 3-, 6- to 9-, 12- to 15-, and 21- to 24-cm depth increments