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Phosphorus

About: Phosphorus is a research topic. Over the lifetime, 53120 publications have been published within this topic receiving 939731 citations. The topic is also known as: element 15 & P.


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Journal ArticleDOI
01 Jan 1993-Ecology
TL;DR: In this paper, the influence of litter quality on the decomposition rate of leaves from nine Mediterranean shrubs and trees using litter bag methods for a 2-yr period at two ecosystems in southwest Spain.
Abstract: We studied the influence of litter quality on the decomposition rate of leaves from nine Mediterranean shrubs and trees using litter bag methods for a 2-yr period at two ecosystems in southwest Spain. Linear and nonlinear regressions were calculated be- tween mass loss and the concentrations of the major organic and inorganic constituents of leaves (lignin, cutin, cellulose, tannins, crude fat, soluble carbohydrates, nitrogen, and phosphorus) and between mass loss and leaf toughness in order to determine the best predictor of leaf litter decomposition in these ecosystems. In addition, ratios between some of the litter quality parameters were examined as mass loss predictors. Loss of soluble components from leaves was used to define two phases of decomposition: a leaching phase that lasted 2-4 mo and a postleaching phase. Leaf toughness and the ratio of toughness: phosphorus concentration were the best indicators of mass loss during the leaching phase in both ecosystems, and cutin: nitrogen or cutin: phosphorus ratios were the best predictors of mass loss in the postleaching phase, but only in the drier and more nutrient-poor ecosystem. When the two phases were combined, leaf toughness, toughness: nitrogen, and/or cutin: nitrogen significantly explained the mass loss in both ecosystems.

355 citations

Journal ArticleDOI
TL;DR: In this paper, a chemical model for the phosphorus-zeolite interaction is proposed in which the framework aluminum pairs are stabilized by extra-framework cationic species formed by protonation of orthophosphoric acid, and the influence of isolated versus pairs of aluminum on activity and selectivity after steaming is discussed.

353 citations

Journal Article
TL;DR: The effects of different levels of nitrogen, phosphorus, and caffeine intake on calcium balance and on certain of its components were assessed in 170 studies in normal middle-aged, but still premenopausal women.

353 citations

Journal ArticleDOI
TL;DR: Temporal patterns of chlorophyll a accrual suggest that availability of nitrogen limited the rate of algal increase, but not the ultimate periphyton standing crop, so it is proposed that nitrogen limitation is common in the desert Southwest.
Abstract: Four nutrient enrichment bioassay experiments were conducted in Sycamore Creek, Arizona, during summer and autumn 1983. In two experiments, nitrogen and phosphorus were added alone and in combination while in the other experiments nitrogen was added singly. In experiments involving enrichment of both nutrient-diffusing substrates (clay flowerpots) and streamwater overlying tile/gravel artificial substrates, nitrogen enrichment significantly enhanced rates of chlorophyll a accrual, primary production, and nitrogen uptake. Addition of phosphorus either singly or in combination with nitrogen did not result in significant responses of these parameters; thus ambient concentrations of phosphorus were above limiting levels, even when excess nitrogen was supplied. Nitrogen additions stimulated periphyton growth when background nitrate-N concentrations were ≤0.055 mg/L. We propose that nitrogen limitation is common in the desert Southwest since concentrations lower than this and atomic nitrogen to phosphorus ratio...

353 citations

Journal ArticleDOI
TL;DR: This work has shown that the utilization of soil nutrients may depend more on efficient uptake of phosphate, nitrate, and ammonium from the soil solution even at low supply concentrations than on mobilization processes in the hyphosphere.
Abstract: Colonization of plant roots by arbuscular mycorrhizal fungi can greatly increase the plant uptake of phosphorus and nitrogen. The most prominent contribution of arbuscular mycorrhizal fungi to plant growth is due to uptake of nutrients by extraradical mycorrhizal hyphae. Quantification of hyphal nutrient uptake has become possible by the use of soil boxes with separated growing zones for roots and hyphae. Many (but not all) tested fungal isolates increased phosphorus and nitrogen uptake of the plant by absorbing phosphate, ammonium, and nitrate from soil. However, compared with the nutrient demand of the plant for growth, the contribution of arbuscular mycorrhizal fungi to plant phosphorus uptake is usually much larger than the contribution to plant nitrogen uptake. The utilization of soil nutrients may depend more on efficient uptake of phosphate, nitrate, and ammonium from the soil solution even at low supply concentrations than on mobilization processes in the hyphosphere. In contrast to ectomy...

352 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20232,479
20225,004
20211,546
20201,644
20191,746