Species and Biogeochemical Cycles of Organic Phosphorus in Sediments From a River With Different Aquatic Plants Located in Huaihe River Watershed, China

Abstract

The results of phosphorus fractionation in the sediments from a contaminated river containing different aquatic plants, analyzed by solution 31P-NMR for Organic Phosphorus, showed that the concentration of Inorganic Phosphorus dominated in all species and Organic Phosphorus accounted for over 20% of Total Phosphorus. In general, orthophosphate was dominant in all the sampling sites. The proportion of Organic Phosphorus accounting for the Total Phosphorus in the sediments with different plant decreased in the following order: Paspalum distichum>Typha orientalis>Hydrilla verticillata. Phosphorus-accumulation ability of Paspalum distichum was obviously stronger than Typha orientalis and Hydrilla verticillata. The Organic Phosphorus was in aquatic plants dominated by humic-associated P (Hu-P), which converted to Inorganic Ohosphorus more significantly in submerged plants than in emerged plants. The sediment dominated by Paspalum distichum abundantly accumulated Organic Phosphorus in the orthophosphate monoester fraction. The degradation and mineralization of orthophosphate monoester was the important source of high Inorganic Phosphorus concentration and net primary productivity in Suoxu River. The Organic Phosphorus derived from Typha orientalis and Hydrilla verticillata was dramatically converted to Inorganic Phosphorus when the environmental factors varied.

Growth and physiological responses of submerged plantVallisneria natansto water column ammonia nitrogen and sediment copper

“…As seen in other polluted freshwater bodies, the ecosystem of the Huai River in China has been severely degraded by excessive pollutant discharge that produced high heavy metal contents, including Cu, and excessive ammonia-N levels in the water column ( Zhang et al, 2010 ; Xia et al, 2011 ; Yuan et al, 2015a ). The Huai River reportedly has ammonia-N concentrations up to 29.70 mg L −1 , and sediment Cu concentrations up to 208.8 mg kg −1 ( Ren et al, 2015 ; Yuan et al, 2015b ).…”

Ecological Risk Assessment Of Heavy Metals In Sediments Of A Riverine Wetland, Huaihe River Watershed, China

“…Relatively low C/N ratios ranging from 4 to 10 can indicate internal organic matter derived from terrigenous detritus and autogenetic algae debris, whereas the large amount of cellulose-rich and protein-poor vascular aquatic plants are the main contributors to organic matter and are responsible for C/N ratios greater than 20 [34]. The sampling locations in this research were mainly covered with silt clay [35]. Relatively high TOC concentrations (9.70±0.17%) may be attributed to the enrichment of fine grained sediments in the riverine wetland.…”

Phosphorus forms in the sediment of seagrass meadows affected mainly by fungi rather than bacteria: a preliminary study based on 31P-NMR and high-throughput sequencing

“…4 | DECEMBER 2020 Faculty of Oceanography and Geography, University of Gdańsk, Poland Mono-P was the dominant Po form in these sediments; it is derived from plants and was detected in all samples. Degradation and mineralization of Mono-P is an important source of net primary productivity (Yuan et al 2015). The usual Mono-P species to be determined are myo-inositol hexakisphosphate and its stereoisomers, such as D-chiro-inositol hexakisphosphate neoinositol hexakisphosphate and scyllo-inositol hexakisphosphate (Turner et al 2003).…”

“…Various bound forms of P in the sediments have different bioavailability, which indicates the need for research on different proportions of P present in the sediment and factors affecting them. In addition, seagrasses as higher plants are adapted to the marine environment and their thick root systems can induce transformation and release of inorganic and organic P from the sediment (Yuan et al 2015). Over the past few decades, P forms and their distribution in marine sediments have been extensively studied (Prasad & Ramanathan 2010;Bramha et al 2014), but there is little research on P forms in seagrass sediments, which significantly reduces the understanding of the P cycle and P supplement in seagrass meadows, and consequently further reduces the conservation and restoration of declining seagrass beds from year to year.…”