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- W2316509905 abstract "1 Riverine ecosystems are important for retention of agriculturally derived nutrients. We investigated the effects of enhanced nutrient availability on the rate of nutrient cycling, feed-back between plant processes and nutrient availability and soil carbon and nutrient storage, in two English riverine ecosystems with a different fertilization history. 2 For two floodplain grasslands, we found different soil carbon and nutrient pools, but no differences in nutrient availability and primary production. These observations were explained by the high probability that added nitrogen is lost from these floodplains, in combination with N-limitation in these naturally P-rich alluvial soils. 3 For two valley slopes, primary production, nutrient uptake and litter production were higher where soil Nand P-availability were higher. At the low-nutrient slope, low tissue P-concentrations, a high P-retranslocation and a high phosphorus use efficiency (PUE cf. Vitousek 1982) were found. This reduced the annual P-loss, which was interpreted as an adaptation to low nutrient availability. The high PUE led to litter and subsequently soil organic matter with a high C/P ratio. N-mineralization showed a strong negative correlation with the C/P ratio of soil organic matter. This suggested an interaction between P and N cycling for soil organic matter break-down, at low nutrient availability. 4 For the slopes we concluded that feed-back between plant production and soil nutrient availability was primarily mediated by litter quality. 5 P-availability was positively correlated to soil pH and soil wetness. We concluded that Nand P-availability had different controlling variables. 6 We found long-term retention of added nutrients in the soil organic matter of the high-nutrient slope. The amount of N-retention was however, limited through plant feed-back on the quality of litter and soil organic matter, which enhanced N-mineralization rates. Phosphorus showed clear long-term retention, which is partly due to inorganic soil adsorption." @default.
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- W2316509905 date "1997-04-01" @default.
- W2316509905 modified "2023-09-27" @default.
- W2316509905 title "Effects of Enhanced Nutrient Availability on Plant and Soil Nutrient Dynamics in Two English Riverine Ecosystems" @default.
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- W2316509905 doi "https://doi.org/10.2307/2960649" @default.
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