Evidence for involvement of keystone fungal taxa in organic phosphorus mineralization in subtropical soil and the impact of labile carbon

2020 ◽  
Vol 148 ◽  
pp. 107900
Author(s):  
Yan Chen ◽  
Ruibo Sun ◽  
Tingting Sun ◽  
Pin Chen ◽  
Zhiying Yu ◽  
...  
Keyword(s):  
Organic Phosphorus ◽  
Labile Carbon ◽  
Subtropical Soil ◽  
Phosphorus Mineralization ◽  
The Impact

Organic Phosphorus Mineralization Studies Using Isotopic Dilution Techniques

2001 ◽  
Vol 65 (3) ◽  
pp. 780-787 ◽  
Author(s):  
F. Oehl ◽  
A. Oberson ◽  
S. Sinaj ◽  
E. Frossard
Keyword(s):  
Organic Phosphorus ◽  
Isotopic Dilution ◽  
Phosphorus Mineralization

scholarly journals Characteristics and Distribution of Organic Phosphorus Fractions in the Surface Sediments of the Inflow Rivers around Hongze Lake, China

2020 ◽  
Vol 17 (2) ◽  
pp. 648 ◽  
Author(s):  
Jie Wan ◽  
Xuyin Yuan ◽  
Lei Han ◽  
Hongmeng Ye ◽  
Xiaofan Yang
Keyword(s):  
Ecological Risk ◽  
Surface Sediments ◽  
Yellow River ◽  
Organic Phosphorus ◽  
River Sediments ◽  
Inorganic Phosphorus ◽  
Risk Effects ◽  
Hongze Lake ◽  
Bioavailable Fraction ◽  
The Impact

In this study, the characteristics and distribution of the organic phosphorus (Po) fractions in the surface sediments of seven inflow rivers around Hongze Lake in China were analyzed with a soil Po fraction method, as used by Ivanoff. The relationships between the Po fractions and physiochemical features of sediments were also discussed. The results showed that, the sediments of the rivers had been moderately pollution with certain ecological risk effects except the Waste Yellow River. The relative contribution order of the Po fractions in the sediments was residual Po > HCl-Po > fulvic acid-Po > humic acid-Po > labile organic phosphorus (LOP). Moderately labile organic phosphorus (MLOP) was the main part of the Po forms in the whole sediments. The risk of phosphorus released from river sediments was the highest in the western region, followed by the southwestern region, and finally the northwestern region. There were significant correlations between Po forms and total phosphorus (TP), inorganic phosphorus (Pi), and Po. Non labile organic phosphorus (NLOP) had the strongest correlation with TP. The distribution of Po forms in each region was different due to the impact of human activities, industrial and agricultural production and the land types; the heaver polluted sediments with higher Po fractions. It is suggested that most of the sediments of the inflow rivers in the regions have certain ecological risk effects and P of them have an important contributions on the eutrophication of Hongze Lake. Po forms can provide a reliable theoretical basis for dealing with the change of water quality and should be paid more attention in the lake eutrophication investigation. There was reciprocal transformation between different Po forms, especially non-bioavailable fraction can change into bio-available ones. The results can provide a basis for the earth cycle of phosphorus and a new perspective of eutrophication control of shallow lakes.

scholarly journals Bioturbation has a limited effect on phosphorus burial in salt marsh sediments

2020 ◽  
Author(s):  
Sebastiaan J. van de Velde ◽  
Rebecca K. James ◽  
Ine Callebaut ◽  
Silvia Hidalgo-Martinez ◽  
Filip J. R. Meysman
Keyword(s):  
Salt Marsh ◽  
Bottom Water ◽  
Solid Phase ◽  
Organic Phosphorus ◽  
Inorganic Phosphorus ◽  
Sediment Reworking ◽  
Co2 Concentrations ◽  
Bottom Waters ◽  
Salt Marsh Sediments ◽  
The Impact

Abstract. It has been hypothesised that the evolution of animals during the Ediacaran-Cambrian transition had a major impact on atmospheric O2 and CO2 concentrations. The models upon which this hypothesis rests, critically assume that bioturbation by the newly evolved fauna increased the burial of organic phosphorus (Porg) within the seafloor, relative to organic carbon (Corg) and that inorganic phosphorus (Pinorg) burial was not affected by bioturbation. This assumption is centrally based on data compilations from marine sediments deposited under oxic and anoxic bottom waters. Since anoxia excludes the presence of infauna and sediment reworking, the observed differences in P burial are assumed to be solely driven by the presence of bioturbators. This reasoning however ignores the potentially confounding impact of bottom water oxygenation on phosphorus burial. Here, our goal is to provide a field verification for the idea that bioturbation increases the relative burial of organic phosphorus, while accounting for bottom water oxygenation. We present solid-phase phosphorus speciation data from salt marsh ponds with and without bioturbation (Blakeney salt marsh, Norfolk, UK). In both cases, the pond sediments are exposed to oxygenated bottom waters and so the only difference is the presence/absence of bioturbating macrofauna. Our data reveal that both the Corg : Porg ratio of buried organic matter and the rate of Pinorg burial are indistinguishable between bioturbated and non-bioturbated sediments. The absence of a clear effect of bioturbation on total P burial implies that previous studies may have overestimated the impact of the rise of bioturbation on atmospheric O2 and CO2 concentrations in the early Cambrian.

scholarly journals Analysis of Biogenic Secondary Pollution Materials from Sludge in Surface Waters

2019 ◽  
Vol 16 (23) ◽  
pp. 4691 ◽  
Author(s):  
Laima Česonienė ◽  
Edita Mažuolytė-Miškinė ◽  
Daiva Šileikienė ◽  
Kristina Lingytė ◽  
Edmundas Bartkevičius
Keyword(s):  
Organic Matter ◽  
Total Phosphorus ◽  
Lake Water ◽  
Organic Phosphorus ◽  
State Monitoring ◽  
Biogenic Substances ◽  
Secondary Pollution ◽  
Secondary Sludge ◽  
Biogenic Material ◽  
The Impact

Many countries of the world, including Lithuania, are making an effort to reduce surface water pollution. State monitoring data show that almost 80% of the lakes in Lithuania have an increased amount of sludge. One of the reasons for this increase in sludge is an excessive amount of biogenic material in the water. It is known that even after the source of pollution is removed, the condition of the lake water does not improve; rather, the condition of the lake water worsens due to the secondary pollution of sludge in the water. A study was conducted to determine the impact of secondary sludge pollution on water. For this study, 5 sludge samples were taken from different lakes in Lithuania. Fresh water was poured on the sludge samples, the concentrations of Nt, NO2-N, NO3-N, NH4-N, PO4-P, Pt, the pH and the changes in the electric conductivity (C) were measured in the water within 28 h. Research has shown that the thickness of the sludge layer influences the total amounts of nitrogen, phosphorus, and organic matter present in the sludge. As the thickness of the sludge layer increases in a lake, the total concentrations of nitrogen, total phosphorus and organic matter increase. Studies have also shown that the concentrations of all biogenic substances in water increase, with the exception of total phosphorus. This finding shows that organic phosphorus is "locked" in sludge, and no secondary pollution occurs from this source. Moreover, the electrical conductivity values of the water influence the release of biogenic substances from sludge in the water.

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