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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 Jun 1980-Ecology
TL;DR: In this article, the authors investigated the effect of salinity stress on plant growth in Spartina marshes in relation to nitrogen limitation and found that relatively more biomass was allocated to belowground rather than aboveground portions of the plants.
Abstract: In a greenhouse investigation Distichlis spicata (L.) and Spartina alterniflora (Loisel.) were grown from seed on freshwater, brackish, and marine sediments. These species were also concurrently grown in sand culture under conditions of nitrogen or phosphorus limitation in order to establish critical tissue concentrations of these elements. These experimentally determined values were used to assess the limiting nutrient status of the plants grown on the sediments. Growth of both species was nitrogen limited on most sediments, and phosphorus was consumed luxuriously on all sediments. Aboveground biomass was correlated with interstitial water nitrogen concentration of the sediments. Under low nutrient conditions relatively more biomass was allocated to belowground rather than aboveground portions of the plants. Although the availability of nitrogen ultimately determined biomass accrual, growth rate was affected by the sediment salinity. Analysis of plant tissues and the sediment interstitial water at the end of the investigation revealed selective uptake of potassium and exclusion of sodium. These processes increased the ratio of sodium to potassium in the interstitial waters and also resulted in increased sediment salinities. The effect of salinity stress on plant growth in Spartina marshes is discussed in relation to nitrogen limitation.

140 citations

Journal ArticleDOI
TL;DR: The phosphorus composition of the main soils of the dominant vegetation categories of the fynbos biome, south-western Cape, South Africa was studied and there were peaks in foliage projective cover, ground litter mass and soil phosphorus concentrations in A. cyclops invaded strandveld.
Abstract: SUMMARY (1) The phosphorus composition of the main soils of the dominant vegetation categories of the fynbos biome, south-western Cape, South Africa was studied. (2) Total, Bray No. 2 and resin-extractable phosphorus, pH and organic matter varied significantly between the soils with the Fernwood soils of the strandveld vegetation containing the highest total (338-422 ,ug g-' dry mass) and resin-extractable (13-40 ug gdry mass) phosphorus concentrations. (3) Organic phosphorus was only 10-15% of total phosphorus in the Fernwood soils of strandveld but was 58-77% in the soils of the other vegetation categories. (4) On the west coast, a gradient of soil texture, bulk density and phosphorus status occurred along a 2-km transect from the coastal dunes inland, through strandveld vegetation, vegetation infested with Acacia cyclops and into sand plain lowland fynbos. (5) A significant decrease in the proportion of calcium-bound and increases in ironbound and saloid fractions of inorganic phosphorus and organic phosphorus occurred along the 2-km transect. (6) Litter phosphorus concentrations declined from the coastal dunes inland through strandveld and sand plain lowland fynbos but there were peaks in foliage projective cover, ground litter mass and soil phosphorus concentrations in A. cyclops invaded strandveld. (7) The phosphorus status of the soils of the south-western Cape excluding the Fernwood soils of the strandveld and the alluvial soils of limestone lowland fynbos is low.

140 citations

Journal ArticleDOI
TL;DR: In this paper, a sediment-type photomicrobial fuel cell (PFC) based on the synergistic interaction between microalgae (Chlorella vulgaris) and electrochemically active bacteria, was developed to remove carbon and nutrients from wastewater, and produce electricity and algal biomass simultaneously.
Abstract: A sediment-type photomicrobial fuel cell (PFC), based on the synergistic interaction between microalgae (Chlorella vulgaris) and electrochemically active bacteria, was developed to remove carbon and nutrients from wastewater, and produce electricity and algal biomass simultaneously. Under illumination, a stable power density of 68 ± 5 mW m−2 and a biomass of 0.56 ± 0.02 g L−1 were generated at an initial algae concentration of 3.5 g L−1. Accordingly, the removal efficiency of organic carbon, nitrogen and phosphorus was 99.6%, 87.6% and 69.8%, respectively. Mass balance analysis suggested the main removal mechanism of nitrogen and phosphorus was the algae biomass uptake (75% and 93%, respectively), while the nitrification and denitrification process contributed to a part of nitrogen removal (22%). In addition, the effect of illumination period on the performance of PFC was investigated. Except notable fluctuation of power generation, carbon and nutrients removal was not significantly affected after changing the light/dark photoperiod from 24 h/0 h to 10 h/14 h. This work represents the first successful attempt to develop an effective bacteria–algae coupled system, capable for extracting energy and removing carbon, nitrogen and phosphorus from wastewater in one-step.

140 citations

Journal ArticleDOI
TL;DR: 1-Butyl-3-methyl-pyridinium-dicyanamide is carbonised with tetra-alkyl-phosphonium-bromide additives yielding nitrogen- and phosphorus-co-doped carbons with enhanced BET surface areas promoted by the additives.

140 citations

Journal ArticleDOI
TL;DR: In this paper, the authors performed two litter decomposition experiments using nearly-senesced red mangrove (Rhizophora mangle L.) leaves collected from an Everglades dwarf MANG to understand the short-term and long-term changes in mass, as well as C-, N-, and P-content of decomposing leaf litter.

140 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