Topic
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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TL;DR: In this paper, a reevaluation of the well-accepted management strategy of decreasing the lake internal P cycling by maintaining an aerobic hypolimnion and sediment surface is presented, and it is shown that oxygenation only results in an increased permanent benthic P burial if, because of depressed sulfide production, more ferrous phosphate and less FeS is deposited in the anoxic sediment.
Abstract: In order to improve the trophic state of Lake Sempach, a eutrophied lake in central Switzerland, its external phosphorus (P) load has been decreased and its hypolimnion has been artificially oxygenated to lower the lake-internal P recycling. Based on more than 15 yr of experience, we conclude that the reduction of the external P load resulted in a corresponding decrease of the lake's P concentration. However, contrary to initial expectations, increased hypolimnetic dissolved oxygen concentrations neither (1) reduced the P release from sediments during summer nor (2) resulted in an increased permanent P retention. These observations warrant a reevaluation of the well-accepted management strategy of decreasing the lake internal P cycling by maintaining an aerobic hypolimnion and sediment surface. We hypothesize that oxygenation only results in an increased permanent benthic P burial if, because of the depressed sulfide production, more ferrous phosphate (e.g., vivianite) and less FeS is deposited in the anoxic sediment. Hence, it is not the oxic sediment surface that directly affects the permanent redox-dependent sediment P retention but the molar ratio of the available reactive Fe(II): S 2- : PO 4 in the anoxic sediment. This ratio is driven by the settling rate and the nature of organic matter and particulate iron, as well as the supply of oxygen, nitrate, and sulfate to the sediment.
292 citations
TL;DR: The increasing application of chromatography to the separation of phospholipids1 has emphasized the need for greater sensitivity in the estimation of total phosphorus.
Abstract: THE increasing application of chromatography to the separation of phospholipids1 has emphasized the need for greater sensitivity in the estimation of total phosphorus.
291 citations
TL;DR: For experiments previously described, new data were presented relating to the intake of phosphorus by gramineous plants, its distribution within the plant, and its partition in the leaves between alcohol-soluble, nucleic-acid, and residual phosphorus as discussed by the authors.
Abstract: For experiments previously described, new data are presented relating to the intake of phosphorus by gramineous plants, its distribution within the plant, and its partition in the leaves between alcohol-soluble, nucleic-acid, and "residual" phosphorus.
291 citations
TL;DR: Effects on leaf growth, biomass accumulation and root morphogenesis associated with the establishment of maize in morphogenesis were studied to test the hypothesis that the root system response can be accounted for by the effect of P.
Abstract: cept light was severely reduced so that root growth was finally reduced. Effects on leaf growth, biomass accumulation and root morphogenesis associated with the establishment of Key words: Zea mays L., maize, phosphorus, root, root phosphorus (P) deficiency were studied on maize in morphogenesis. order to test the hypothesis that the root system response can be accounted for by the effect of P
291 citations
TL;DR: A conceptual model of resource partitioning for soil phosphorus is proposed, which describes a hypothetical example of four coexisting plant species that differ in their ability to access soil organic phosphorus compounds, which are grouped to form a gradient of biological availability based on the processes involved in their utilization by plants.
Abstract: Summary 1. Organic phosphorus is abundant in soil and its turnover can supply a considerable fraction of the phosphorus taken up by natural vegetation. Despite this, the ecological significance of organic phosphorus remains poorly understood, which is remarkable given the biological importance of phosphorus in terrestrial environments. 2. Of particular interest is the possibility that coexisting plant species partition soil organic phosphorus to reduce competition. This seems likely given the large number of biologically available phosphorus compounds that occur in soil and the variety of mechanisms by which plants can utilize them. 3. Here I propose a conceptual model of resource partitioning for soil phosphorus. The model describes a hypothetical example of four coexisting plant species that differ in their ability to access soil organic phosphorus compounds, which are grouped to form a gradient of biological availability based on the processes involved in their utilization by plants. 4. Synthesis: Resource partitioning for soil phosphorus could provide an additional mechanism to
291 citations