CHANGE OF AOS ENZYME’S ACTIVITY – BIOCHEMICAL INDICATOR OF XYLOGENESIS SCENARIOS AT DIFFERENT RATIO OF MOBILE NITROGEN AND PHOSPHORUS FORMS IN THE SOIL

The vertical and diurnal variation of nitrogen and phosphorus forms, as well as that of soluble reactive silica (SRS), were studied in four sampling days at Garças reservoir, a shallow tropical one located in the city of São Paulo, in southeastern Brazil. Except for N-NH4, all other inorganic forms of nitrogen (N-NO2, N-NO3, and total N) demonstrated decreased concentrations toward the bottom of reservoir. Similarly, all showed significant diurnal differences on every sampling day, with increased values during the night due to absence of photosynthetic assimilation during that period. In the sampling days, these forms decreased on the spring sampling day due to the bloom of Microcystis registered during this period of the year. All three forms of phosphorus (SRP, particulate P, and total P) showed significant vertical variation, except on the fall sampling day. On the summer sampling day there was an increase of both total P and particulate P, the latter because it constitutes more than 70% of the total P during all sampling days. Hourly phosphorus variation was significant during all sampling days, except for the summer one. The SRS vertical variation was significant during all sampling days, except for that in the spring. It was also different hourly on sampling days.

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Forms of Nitrogen and Phosphorus in Suspended Solids: A Case Study of Lihu Lake, China

Sustainability ◽

10.3390/su12125026 ◽

2020 ◽

Vol 12 (12) ◽

pp. 5026 ◽

Cited By ~ 1

Author(s):

Jialu Li ◽

Qiting Zuo

Keyword(s):

Water Quality ◽

Suspended Solids ◽

Inorganic Phosphorus ◽

Nitrogen And Phosphorus ◽

Lake Ecosystems ◽

Phosphorus Forms ◽

Sequential Extraction Method ◽

Main Component ◽

The Impact

Suspended solids are an important part of lake ecosystems, and their nitrogen and phosphorus contents have a significant effect on water quality. However, information on nitrogen and phosphorus forms in suspended solids remains limited. Therefore, a case study was conducted in Lihu Lake (China), a lake with characteristically high amounts of suspended solids. Nitrogen and phosphorus speciation in suspended solids was analyzed through a sequential extraction method. We also evaluated the sources of various forms of nitrogen and phosphorus and their different effects on eutrophication. The total nitrogen (TN) content was 758.9–3098.1 mg/kg. Moreover, the proportions of various N forms in the suspended solids of the study areas were ranked as follows: Hydrolyzable nitrogen (HN) > residual nitrogen (RN) > exchangeable nitrogen (EN). Total phosphorus (TP) ranged from 294.8 to 1066.4 mg/kg, and 58.6% of this TP was inorganic phosphorus (IP). In turn, calcium (Ca)-bound inorganic phosphorus (Ca-Pi) was the main component of IP. The correlation between various nitrogen and phosphorus forms showed that there were different sources of suspended nitrogen and phosphorus throughout Lihu Lake. Correlation analysis of water quality indices and comparative analysis with surface sediments showed that in Lihu Lake, the dissolved nitrogen and phosphorus contents in water were influenced by sediment through diffusion, while particle phosphorus content in water was influenced by suspended solids through adsorption; however, due to the higher phosphorus contents in suspended solids, we should pay more attention to the impact of suspended solids.

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Nutrient concentrations in runoff from pasture in Westernport, Victoria

Soil Research ◽

10.1071/sr9830139 ◽

1983 ◽

Vol 21 (2) ◽

pp. 139 ◽

Cited By ~ 13

Author(s):

NB Greenhill ◽

KI Peverill ◽

LA Douglas

Keyword(s):

Land Management ◽

Fertilizer Application ◽

Nutrient Concentrations ◽

Nitrogen And Phosphorus ◽

Phosphorus Forms ◽

High Concentrations

Concentrations of nitrogen and phosphorus forms, calcium, sulfur and potassium in runoff from previously fertilized plots were explained on the basis of differences in slope, previous fertilizer history, and land management at three runoff sites. Data are also given for concentrations of nitrogen and phosphorus forms, calcium, sulfur and potassium in runoff that occurred after superphosphate was applied. High concentrations of phosphorus forms, calcium and sulfur occurred in runoff from a storm 24 h after fertilizer application. At other times, concentrations of all measured parameters were low, and similar to those reported elsewhere.

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DYNAMICS OF NITROGEN AND PHOSPHORUS FORMS CONTENT IN DOJLIDY RETENTION RESERVOIRE

Journal of Ecological Engineering ◽

10.12911/22998993/66242 ◽

2017 ◽

Vol 18 (1) ◽

pp. 147-153

Author(s):

Katarzyna Oszczapińska ◽

Iwona Skoczko ◽

Joanna Szczykowska

Keyword(s):

Nitrogen And Phosphorus ◽

Phosphorus Forms

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Study on investigation of Distribution Characteristics of Nitrogen and Phosphorus Forms in the Soil/Sediment of North and South Banks of Huaihe River Basin

10.7185/gold2021.6613 ◽

2021 ◽

Author(s):

JinXin Zhang ◽

LiangMin Gao ◽

XiaoQing Chen ◽

Hui Wang ◽

LingHan Liu ◽

...

Keyword(s):

River Basin ◽

Distribution Characteristics ◽

Huaihe River Basin ◽

Huaihe River ◽

Nitrogen And Phosphorus ◽

Phosphorus Forms ◽

Soil Sediment ◽

North And South

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The variability in concentrations of chosen nitrogen and phosphorus forms in the Oder River estuary in 1999-2002

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-010-0036-2 ◽

2010 ◽

Vol 39 (3) ◽

Cited By ~ 3

Author(s):

Agnieszka Tórz ◽

Arkadiusz Nędzarek

Keyword(s):

Total Nitrogen ◽

Nitrogen Concentration ◽

River Estuary ◽

Estuarine System ◽

Nitrogen And Phosphorus ◽

Szczecin Lagoon ◽

Phosphorus Forms ◽

Total Nitrogen Concentration ◽

Oder River ◽

Pomeranian Bay

The variability in concentrations of chosen nitrogen and phosphorus forms in the Oder River estuary in 1999-2002The Oder River creates one of the largest estuaries in Poland. The estuary can be divided into three zones, each with a different hydrochemical regime: the Pomeranian Bay (salt water habitat), the Szczecin Lagoon (brackish water habitat), the Oder River up to the Widuchowa section (transitional environment - brackish and typical freshwater). The Pomeranian Bay was characterized by the lowest concentration of nutrients throughout the research series in comparison to the other regions. It had a low nitrogen to phosphorus proportion and the highest stability of variability in total nitrogen concentration. The Szczecin Lagoon was characterized by a higher concentration of nutrient loads in comparison to the Pomeranian Bay, by a lower nitrogen and phosphorus proportion than the Oder waters, and by the high stability of variability of concentrations of mineral nitrogen and total nitrogen. As the "nutrient trap" for the Oder estuarine system, the Oder River, with its highest nutrient concentration, is characterized by the highest stability of variability of total nitrogen concentration.

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Spatial-temporal variations of nitrogen and phosphorus forms in sediment porewater as affected by submerged plant in Lake Dianchi

Journal of Lake Sciences ◽

10.18307/2018.0204 ◽

2018 ◽

Vol 30 (2) ◽

pp. 314-325 ◽

Cited By ~ 1

Author(s):

ZHANG Yun ◽

◽

WANG Shengrui ◽

DUAN Changqun ◽

JIAO Lixin ◽

...

Keyword(s):

Temporal Variations ◽

Submerged Plant ◽

Nitrogen And Phosphorus ◽

Lake Dianchi ◽

Phosphorus Forms

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Risk Assessment Based on Nitrogen and Phosphorus Forms in Watershed Sediments: A Case Study of the Upper Reaches of the Minjiang Watershed

Sustainability ◽

10.3390/su11205565 ◽

2019 ◽

Vol 11 (20) ◽

pp. 5565 ◽

Cited By ~ 2

Author(s):

Hongmeng Ye ◽

Hao Yang ◽

Nian Han ◽

Changchun Huang ◽

Tao Huang ◽

...

Keyword(s):

Ecological Risk ◽

Evaluation Method ◽

Pollution Index ◽

Risk Level ◽

Nutrient Elements ◽

Nitrogen And Phosphorus ◽

Phosphorus Forms ◽

Minjiang River ◽

Index Evaluation ◽

Bioavailability Index

In order to achieve effective eutrophication control and ecosystem restoration, it is of great significance to investigate the distribution characteristics of nutrient elements in sediments, and to perform ecological risk assessments. In the current grading criteria for nutrient elements in sediments, only the overall or organic components of carbon, nitrogen and phosphorus are considered, while the specific species distributions and bioavailability characteristics are rarely taken into account. Hence, using the current grading criteria, the differences in the release, migration and biological activity of nutrient elements in sediments cannot be accurately reflected. Taking the upper reaches of the Minjiang River watershed as an example, we analyzed the overall distributions and the ratio of nutrient elements in sediments, the spatial changes of nitrogen and phosphorus forms, the bioavailability, and the environmental significance. The ecological risk of nitrogen and phosphorus in sediments was assessed using an evaluation method based upon the biological effective parameter. The results were compared with the results of the evaluation methods based on the single pollution index, and then these evaluation methods were confirmed accordingly. From the results, the following conclusions can be obtained: (1) The spatial distributions of nutrient elements in sediments in the upper reaches of the Minjiang River Watershed (including the Jianxi Basin, Futunxi Basin, and Shaxi Basin) were significantly affected by the local ecology and the urban sewage discharge system. (2) The maximum average contents of total organic carbon (TOC), total nitrogen (TN), and total phosphorus (TP) in sediments were observed in the Jianxi Basin, the Futunxi Basin and the Shaxi Basin, respectively. (3) According to the contents of nitrogen and phosphorus in sediments, the bioavailable nitrogen (TTN) accounted for 35.49% of the total contents of TN. The components of TTN can be sorted from high to low as follows: Nitrogen in organic sulfide form (SOEF-N) > nitrogen in iron-manganese oxide form (SAEF-N) > nitrogen in ion exchange form (IEF-N) > nitrogen in weak acid leaching form (WAEF-N). Inorganic phosphorus (IP) was the main component of TP. The components of IP can be sorted from high to low as follows: Metal oxide bound phosphorus (NaOH-P) > calcium bound phosphorus (HCl-P) > reduced phosphorus (BD-P) > weakly adsorbed phosphorus (NH4Cl-P). Meanwhile, bioavailable phosphorus (BAP, BAP = NH4Cl-P + BD-P + NaOH-P) accounted for 36.94% of TP. According to the results of the single pollution index method, the risk level of TOC pollution in the sediments was relatively low in the whole area, while the risk level of TN pollution was low or moderate in most zones, and severe in certain ones. The risk level of TP pollution was low to moderate. (4) From the results of the bioavailability index evaluation method, based on the total amounts and forms of N and P, the risk level of N pollution was moderate, while the risk of P pollution was negligible. In addition, the results of the bioavailability index evaluation method were more consistent with the actual situation and reflected the overall environmental effects of nitrogen and phosphorus.

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