Recently accreted soil

Depending on the soil type, the efficiency factor (refers to chloroform fumigation extraction efficiency) may vary from 0.3 to 0.4. Caution should be exercised in using these efficiency factors. In recently accreted soils with high labile organic matter content and in soils containing fine roots, use of efficiency factors may overestimate the MBP. 

Several microbial processes are affected by the phosphorus enrichment of the soil and litter. Recently, accreted plant detritus and floe showed a high degree of positive response to phosphorus loading on various microbial processes. 

As discussed earlier, most of the phosphorus entering wetlands accumulates within the system. Surface soils in nutrient-impacted wetlands are often enriched as a result of recent accumulation, decomposition processes, and remobilization of phosphorus from subsurface soils to surface through plant uptake and deposition as detritus material. Thus, total phosphorus content of surface soils is higher than that of subsurface soils. Similar total phosphorus profiles have been seen for many wetlands and aquatic systems. In the impacted site, subsurface total phosphorus content can also represent the background levels of phosphorus for these soils, assuming that the surface material is the result of recent accumulation. Much of this phosphorus accumulation is due to organic matter accretion (detrital matter deposition) associated with phosphorus sorption to particulate matter. 

Craft, C. B. and C. J. Richardson. 1998. Recent and long-term organic soil accretion and nutrient accumulation in the Everglades. Soil Sci. Soc. Am. J. 62 834-843. 

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