The Global Phosphorus Cycle
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...The P weathering rate for the intermediate weathered soil orders was varied to give a global total P weathering rate of about 0.002 Gt P year−1 (Filippelli, 2002)....
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"The Global Phosphorus Cycle" refers result in this paper
...The molar ratio of Corg:Porg is elevated compared to the values of Redfield et al. (1963) throughout the Saanich Inlet record (Fig....
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...Also, these values contrast with the value of about 106 in marine organic matter (e.g., Redfield et al. 1963), which is the dominant source of organic C and P to the marine sediments....
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...Certainly, the values greater than Redfield et al. (1963) projected even for the surficial sediments indicate a small preferential loss of P from this system during organic matter degradation, supported by P flux measurements in this and other margin settings (e.g., Murray et al. 1978, Ingall and…...
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"The Global Phosphorus Cycle" refers background in this paper
...In exchange, the plant provides carbohydrates to the mycorrhizal fungi (Schlesinger 1997)....
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...Unbeknownst to the farmers, the P-rich rock they were applying to their fields was also rich in cadmium and uranium, both naturally found in the organic-rich marine sediments that are precursors to phosphorite rocks but also toxic to plants (Schlesinger 1997)....
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...Relatively high values of 400 are seen in the glacially-derived clays in the older sections, likely reflecting typical Corg:Porg ratios in terrestrial soils and sediments (Schlesinger 1997)....
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...In the lower Amazon, the transport-limited regime yields soil material that is nearly completely leached of phosphorus (Stallard and Edmond 1983), a nutrient limitation that requires ecosystems in this region to extensively recycle this element (e.g., Schlesinger 1997)....
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...First, the reduced pH produced from respiration-related CO2 in the vicinity of both degrading organic matter and root hairs dissolves P-bearing minerals (mainly apatites) and releases P to root pore spaces (e.g., Schlesinger 1997)....
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