scholarly journals Influence of dual nitrogen and phosphorus additions on nutrient uptake and saturation kinetics in a forested headwater stream

2018 ◽  
Vol 37 (4) ◽  
pp. 810-825 ◽  
Author(s):  
Natalie A. Griffiths ◽  
Laura T. Johnson
Keyword(s):  
Nutrient Uptake ◽  
Headwater Stream ◽  
Nitrogen And Phosphorus ◽  
Saturation Kinetics

scholarly journals Nitrogen and Phosphorus Uptake Dynamics in Tropical Cerrado Woodland Streams

Water ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 1080 ◽  
Author(s):  
Nícolas Reinaldo Finkler ◽  
Flavia Tromboni ◽  
Iola Boëchat ◽  
Björn Gücker ◽  
Davi Gasparini Fernandes Cunha
Keyword(s):  
Nutrient Uptake ◽  
N Uptake ◽  
Pollution Abatement ◽  
Phosphorus Uptake ◽  
Soluble Reactive Phosphorus ◽  
Nitrogen Retention ◽  
Water Velocity ◽  
Nutrient Concentrations ◽  
Nitrogen And Phosphorus ◽  
Lotic Ecosystem

Pollution abatement through phosphorus and nitrogen retention is a key ecosystem service provided by streams. Human activities have been changing in-stream nutrient concentrations, thereby altering lotic ecosystem functioning, especially in developing countries. We estimated nutrient uptake metrics (ambient uptake length, areal uptake rate, and uptake velocity) for nitrate (NO3–N), ammonium (NH4–N), and soluble reactive phosphorus (SRP) in four tropical Cerrado headwater streams during 2017, through whole-stream nutrient addition experiments. According to multiple regression models, ambient SRP concentration was an important explanatory variable of nutrient uptake. Further, best models included ambient NO3–N and water velocity (for NO3–N uptake metrics), dissolved oxygen (DO) and canopy cover (for NH4–N); and DO, discharge, water velocity, and temperature (for SRP). The best kinetic models describing nutrient uptake were efficiency-loss (R2 from 0.47–0.88) and first-order models (R2 from 0.60–0.85). NO3–N, NH4–N, and SRP uptake in these streams seemed coupled as a result of complex interactions of biotic P limitation, abiotic P cycling processes, and the preferential uptake of NH4–N among N-forms. Global change effects on these tropical streams, such as temperature increase and nutrient enrichment due to urban and agricultural expansion, may have adverse and partially unpredictable impacts on whole-stream nutrient processing.

Column experiments show that cycling of both nitrogen and phosphorus is altered by dissolved organic carbon in river sediments

2021 ◽  
Author(s):  
Marc Stutter ◽  
Daniel Graeber ◽  
Gabriele Weigelhofer
Keyword(s):  
Organic Carbon ◽  
Nutrient Uptake ◽  
Inorganic Nitrogen ◽  
River Sediments ◽  
P Uptake ◽  
Controlled Study ◽  
Column Experiments ◽  
Nitrogen And Phosphorus ◽  
Organic C ◽  
Riparian Trees

<p>Since agriculture and wider development have altered simultaneously runoff, pollution and natural structures in catchments (e.g. wetlands, floodplains, soil drainage, riparian trees) aquatic ecosystems deviate from background concentrations of N and P, but also organic C (OC). Hence mechanistic studies coupling OC, N and P are needed and whilst data coupling OC:N is becoming more available and interpreted this is not yet the case for aquatic OC:P.  Column flow experiments (excluding light) allow preliminary controlled study of microbial biogeochemical processes in benthic sediments exposed to factorial nutrients (here +C, +NP, +CNP using simple dissolved substrates glucose, nitrate, and phosphate).</p><p>Based on the stoichiometric theory, we tested the hypothesis that bioavailable DOC will stimulate the heterotrophic uptake of soluble reactive P (SRP) and dissolved inorganic nitrogen in stream sediments. Glucose-C additions increased nutrient uptake, but also NP additions enhanced consumption of native and added OC. The effects of C addition were stronger on N than P uptake, presumably because labile C stimulated both assimilation and denitrification, while adsorption (unaffected by the presence or not of OC) formed a part of P uptake. Internal biogeochemical cycling lessened net nutrient uptake due to N and P recycling into dissolved organically-complexed forms (DOP and DON).</p><p>Simple column experiments point to mechanisms whereby availability of organic carbon can stimulate N and P sequestration in the bed of nutrient-polluted streams. This should promote further studies coupling OC with N and, especially P, towards better knowledge and ability to incorporate coupled macronutrient cycles into nutrient models and, potentially, ecosystem management.</p>

Nitrogen and phosphorus resorption in trees of a neotropical rain forest

2003 ◽  
Vol 19 (4) ◽  
pp. 465-468 ◽  
Author(s):  
José Luis Martínez-Sánchez
Keyword(s):  
Plant Growth ◽  
Nutrient Uptake ◽  
Leaf Senescence ◽  
Rain Forest ◽  
Nitrogen And Phosphorus ◽  
Element Cycling ◽  
Limiting Nutrient ◽  
Ecosystem Level ◽  
Neotropical Rain Forest ◽  
Senesced Leaves

In lowland tropical and temperate forests, nitrogen (N) and phosphorus (P) resorption from senesced leaves may reflect a mechanism of conservation of a limiting nutrient (Edwards & Grubb 1982, Killingbeck 1996, Proctor et al. 1989, Scott et al. 1992, Songwe et al. 1997, Vitousek & Sanford 1986). At the ecosystem level it has important implications for element cycling. The nutrients which are resorbed during leaf senescence are directly available for further plant growth, which makes a species less dependent on current nutrient uptake. Nutrients which are not resorbed, however, will be circulated through litterfall in the longer term (Aerts 1996).

scholarly journals The capability of organic matter decomposition and nutrient uptake in coastal waters of Ca Na bay, Ninh Thuan province

2019 ◽  
Vol 19 (4A) ◽  
pp. 103-113
Author(s):  
Hoang Trung Du ◽  
Nguyen Trinh Duc Hieu
Keyword(s):  
Organic Matter ◽  
Nutrient Uptake ◽  
Coastal Waters ◽  
Rainy Season ◽  
Laboratory Experiments ◽  
Dry Season ◽  
Organic Matter Decomposition ◽  
Environmental Capacity ◽  
Nitrogen And Phosphorus ◽  
Organic Decomposition

This paper focuses on the capability of organic matter decomposition and inorganic nutrient uptake in the coastal waters of Ca Na bay (Ninh Thuan province) in October, 2018 (the rainy season) and May, 2019 (the dry season).  The results of laboratory experiments on organic decomposition, photosynthesis and nutrient uptake showed that the BODgh and the average values of k- decay rate in coastal waters of the surveyed area are higher in the rainy season compared with the dry season, with the average BODgh values of 5.474 mgO2/l and 4.768 mgO2/l respectively, and the corresponding k-values of 0.183 day-1 and 0.143 day-1. Howver, the half-life decay of organic matter is lower in the rainy season than in the dry season, with the corresponding values of 5.110 days and 5.571 days. In the studied area, the photosynthesis of phytoplankton strongly absorbs nitrate (NO3-), followed by ammonium (NH4+) and phosphate (PO43-). The capability of nutrient uptake for nitrogen and phosphorus components was 9.17 mgN/m3/hour and 0.92 mgP/m3/hour, respectively in the dry season; and 7.31 mgN/m3/hour and 0.63 mgP/m3/hour in the rainy season. The results of the study are favorable condition for calculating the environmental capacity in the coastal waters of Ca Na bay in the future.

scholarly journals Nitrogen and Phosphorus Fertilization Promotes Aerial Part Development and Affect Nutrient Uptake by Carobinha of the Brazilian Cerrado

2017 ◽  
Vol 08 (13) ◽  
pp. 3377-3398
Author(s):  
Willian Vieira Gonçalves ◽  
Maria do Carmo Vieira ◽  
Thiago de Oliveira Carnevali ◽  
Néstor A. Heredia Zárate ◽  
Heldo Denir Vhaldor Rosa Aran ◽  
...  
Keyword(s):  
Nutrient Uptake ◽  
Aerial Part ◽  
Phosphorus Fertilization ◽  
Brazilian Cerrado ◽  
Nitrogen And Phosphorus

scholarly journals Effect of nitrogen and phosphorus levels and ratios on seed yield and nutrient uptake of sunflower hybrid DSH-I

Helia ◽  
2002 ◽  
Vol 25 (37) ◽  
pp. 59-68 ◽  
Author(s):  
N. Thavaprakash ◽  
Siva Kumar ◽  
K. Raja ◽  
Senthil Kumar
Keyword(s):  
Nutrient Uptake ◽  
Seed Yield ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Levels

scholarly journals Legume-Rhizobium Strain Specificity Enhances Nutrition and Nitrogen Fixation in Faba Bean (Vicia faba L.)

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 826 ◽  
Author(s):  
Bayou Bunkura Allito ◽  
Nana Ewusi-Mensah ◽  
Vincent Logah
Keyword(s):  
Nitrogen Fixation ◽  
Nutrient Uptake ◽  
Vicia Faba ◽  
Total Nitrogen ◽  
Soil Nitrogen ◽  
Nitrogen Balance ◽  
Nitrogen And Phosphorus ◽  
Rhizobium Strains ◽  
Vicia Faba L ◽  
Soil Nitrogen Balance

This study reports the effectiveness of some selected rhizobium strains in enhancing nitrogen fixation and nutrient uptake in Vicia faba L. Multi-location field experiments were conducted for two years (2016 and 2017) using a split-plot in randomized complete block design. Treatments comprised six rhizobium strains as the main plot factor and three varieties of Vicia faba as the sub-plot factor. Non-inoculated plants with or without N fertilizer served as +N and −N controls, respectively. Peat carrier-based inoculant of each strain was applied at the rate of 10 g kg−1 seed. Data on nodulation were taken at the late-flowering stage, whereas nitrogen and phosphorus concentrations in plant parts were analyzed at physiological maturity. The total nitrogen difference method was employed to quantify nitrogen fixation. Location x rhizobium strain x variety interaction had a significant effect on nodule dry weight plant−1. Rhizobium strains significantly enhanced nodulation, nitrogen fixation, nutrient uptake and soil nitrogen balance. Inoculation with NSFBR-12 and NSFBR-15 resulted in the highest nitrogen fixed, nutrient uptake and soil nitrogen balance. Vicia faba inoculated with the two top performing strains, NSFBR-12 and NSFBR-15 fixed respectively 87.7% and 85.5% of the total nitrogen uptake. Non-inoculated plants fulfilled proportionately more of the total nitrogen uptake through nitrogen derived from the soil rather than fixed nitrogen. Soil available phosphorus and pH had appreciable influences on nitrogen and phosphorus uptake of inoculated Vicia faba. Inoculation with competitive and effective rhizobium strains can improve soil nitrogen balance, nitrogen fixation and nutrient uptake of Vicia faba.

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