Nitrogen addition regulates tradeoff between root capture and foliar resorption of nitrogen and phosphorus in a subtropical pine plantation

Trees ◽  
2016 ◽  
Vol 31 (1) ◽  
pp. 77-91 ◽  
Author(s):  
Liang Kou ◽  
Huimin Wang ◽  
Wenlong Gao ◽  
Weiwei Chen ◽  
Hao Yang ◽  
...  
Keyword(s):  
Nitrogen Addition ◽  
Pine Plantation ◽  
Nitrogen And Phosphorus

scholarly journals Effects of nitrogen and phosphorus on the abundance and cell size of planktonic nanoflagellate communities

2013 ◽  
Vol 24 (4) ◽  
pp. 427-437
Author(s):  
Danielle Goeldner Pereira ◽  
Fábio Amodêo Lansac-Tôha ◽  
Gustavo Mayer Pauleto ◽  
Luis Mauricio Bini ◽  
Luiz Felipe Machado Velho
Keyword(s):  
Cell Size ◽  
Nutrient Enrichment ◽  
Nitrogen Addition ◽  
Nutrient Addition ◽  
Heterotrophic Nanoflagellates ◽  
Nitrogen And Phosphorus ◽  
Tropical Reservoir ◽  
Pigmented Nanoflagellates ◽  
Density And Biomass ◽  
Nitrogen And Phosphorus Enrichment

AIM: We experimentally investigated the effects of nutrients (Nitrogen and Phosphorus) enrichment on the density, biomass, and cell size of pigmented and heterotrophic plankton nanoflagellates communities. METHODS: The experiment was done in mesocosms in a tropical reservoir during a 19-day period. Four different treatments were carried out: Control (non-nutrient addition - C), phosphorus additions (P), nitrogen addition (N) and phosphorus + nitrogen addition (N + P). Each treatment was performed in triplicate, sorted randomly, thus giving a total of 12 experimental carboys, which were placed transversely in the middle of the reservoir. RESULTS: In general, pigmented and heterotrophic nanoflagellates fractions responded to nutrient addition, increasing densities and biomass values at the fertilized treatments. Opposed to expected, enriched treatments resulted in a slight decrease in mean cell size of the pigmented fraction. Moreover, in nutrient-rich treatments, pigmented nanoflagellates had higher relative abundance than in the control. CONCLUSIONS: Our results indicate that: i) the density and biomass of nanoflagellates responded to the nutrient enrichment, mainly when N and P were added together; ii) the pigmented and heterotrophic fractions showed distinct time responses to fertilization; iii) the growth of nanoflagellate community seems to be co-limited by N and P; iv) the nutrient enrichment led to a greater pigmented than heterotrophic fraction contribution; and v) among the analyzed variables, nanoflagellate densities seem to be more sensitive to changes in nutrient availability than biomass or mean cell size.

scholarly journals Effect of Short-Term Low-Nitrogen Addition on Carbon, Nitrogen and Phosphorus of Vegetation-Soil in Alpine Meadow

2021 ◽  
Vol 18 (20) ◽  
pp. 10998
Author(s):  
Zhen’an Yang ◽  
Wei Zhan ◽  
Lin Jiang ◽  
Huai Chen
Keyword(s):  
Alpine Meadow ◽  
Nitrogen Addition ◽  
Ammonium Nitrogen ◽  
N Deposition ◽  
Total Carbon ◽  
N Addition ◽  
Short Term ◽  
Nitrogen And Phosphorus ◽  
Soil Rhizosphere ◽  
And Function

As one of the nitrogen (N) limitation ecosystems, alpine meadows have significant effects on their structure and function. However, research on the response and linkage of vegetation-soil to short-term low-level N deposition with rhizosphere processes is scant. We conducted a four level N addition (0, 20, 40, and 80 kg N ha−1 y−1) field experiment in an alpine meadow on the Qinghai-Tibetan Plateau (QTP) from July 2014 to August 2016. We analyzed the community characteristics, vegetation (shoots and roots), total carbon (TC), nutrients, soil (rhizosphere and bulk) properties, and the linkage between vegetation and soil under different N addition rates. Our results showed that (i) N addition significantly increased and decreased the concentration of soil nitrate nitrogen (NO3−-N) and ammonium nitrogen, and the soil pH, respectively; (ii) there were significant correlations between soil (rhizosphere and bulk) NO3−-N and total nitrogen (TN), and root TN, and there was no strong correlation between plant and soil TC, TN and total phosphorus, and their stoichiometry under different N addition rates. The results suggest that short-term low-N addition affected the plant community, vegetation, and soil TC, TN, TP, and their stoichiometry insignificantly, and that the correlation between plant and soil TC, TN, and TP, and their stoichiometry were insignificant.

Aerobic treatment of industrial waste water – experiences with the dosage of nitrogen and phosphorus

2000 ◽  
Vol 41 (9) ◽  
pp. 241-249
Author(s):  
L. Prendl ◽  
B. Nikolavcic
Keyword(s):  
Industrial Wastewater ◽  
Nitrogen Addition ◽  
Ammonia Concentration ◽  
Control Procedure ◽  
Aerobic Treatment ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Addition ◽  
Additional Demand ◽  
Total P ◽  
Raw Wastewater

In industrial wastewater, especially from food industry, the concentrations of the organic compounds are usually high, whereas the contents of nitrogen and phosphorus are often low. For the aerobic treatment, the addition of nutrients to the industrial wastewater can be required. For ecological and economic reasons, this nutrient addition must be kept to a minimum. Unintentional nitrification and denitrification lead to an additional demand of nitrogen and should therefore be avoided at such plants. Observations from two treatment plants (50 000 m3/d, 40 t COD/d) proved that the nitrogen dosage can be controlled by monitoring the ammonia concentration. If the control procedure also considers the N/COD ratio in the raw wastewater (including the N dosage) and the organic sludge load of the last couple of days, very low effluent concentrations (NH4–N in the range of 0.3–0.5 mg/l) can be achieved and the nitrogen dosage is low. If there are periods with nitrogen in excess, too, a minimum nitrification capacity has to be maintained by means of nitrogen addition in periods of deficiency. A control procedure for phosphorus addition is to keep a fixed P/COD-ratio in the raw wastewater (including P dosage). The PO4–P concentration is monitored in order to limit the maximum phosphorus dosage. Following this procedure, considerable savings of phosphorus have been achieved, keeping very low effluent concentrations (average Total-P<0.3 mg/l).

Direct and indirect effects of calcium sulfate and nitrogen on growth and succession of trees on the Tanana River floodplain, interior Alaska

1993 ◽  
Vol 23 (5) ◽  
pp. 995-1000 ◽  
Author(s):  
F. Stuart Chapin III ◽  
Lawrence R. Walker
Keyword(s):  
Polyethylene Glycol ◽  
Calcium Sulfate ◽  
Nitrogen Addition ◽  
Nutrient Accumulation ◽  
Sensitive Species ◽  
Nitrogen And Phosphorus ◽  
Tissue Concentrations ◽  
Balsam Poplar ◽  
Low Nitrogen ◽  
Potential Transpiration

Seedlings of Alaskan floodplain species (Populusbalsamifera L. (balsam poplar), Alnustenuifolia Nutt. (thinleaf alder), and Piceaglauca (Moench) Voss (white spruce)) and an upland species (Populustremuloides Michx. (trembling aspen)) were grown in early-successional floodplain soils treated with a floodplain salt (calcium sulfate, CaSO4), an osmoticant (polyethylene glycol), and nitrogen. CaSO4 reduced the growth of aspen relative to controls but also reduced the growth of some typical floodplain colonizers (alder at low nitrogen and poplar at high nitrogen). Aspen and poplar were the most rapidly growing species, even when grown with salt or polyethylene glycol. Effects of CaSO4 on growth, therefore, do not explain why aspen is less abundant on the floodplain than are typical floodplain colonizers. CaSO4 reduced growth directly in salt-sensitive species, judging from the insensitivity of water potential, transpiration, and photosynthesis to CaSO4 addition. Tissue concentrations of nitrogen and phosphorus were unaffected by CaSO4, suggesting that the declines in nutrient accumulation by salt-sensitive species in response to CaSO4 addition reflected a decline in nutrient demands for growth rather than being the cause of the reduction in growth. Growth and nutrient accumulation were stimulated by nitrogen addition in all species. We suggest that floodplain salts may be important in succession by slowing the establishment and growth of alder, which is responsible for most of the nitrogen acquired by plants during succession.

scholarly journals Impacts of nitrogen addition on foliar nitrogen and phosphorus stoichiometry in a subtropical evergreen broad-leaved forest in Mount Wuyi

2016 ◽  
Vol 40 (11) ◽  
pp. 1124-1135 ◽  
Author(s):  
WANG Qiao-Shu-Yi ◽  
◽  
ZHENG Cheng-Yang ◽  
ZHANG Xin-Yang ◽  
ZENG Fa-Xu ◽  
...  
Keyword(s):  
Nitrogen Addition ◽  
Nitrogen And Phosphorus ◽  
Foliar Nitrogen ◽  
Broad Leaved Forest ◽  
Leaved Forest

Chipilín (C. longirostrata Hook. and Arn.) Capacity for Regrowth and Leaf Area Production in Response to Nitrogen and Phosphorus Fertilizer Application 

2021 ◽  
Author(s):  
N. Pardo-Aguilar ◽  
L.C. Lagunes-Espinoza ◽  
S. Salgado-García ◽  
E. Hernández-Nataren ◽  
E.D. Bolaños-Aguilar
Keyword(s):  
Leaf Area ◽  
Growth Yield ◽  
Phosphate Fertilizer ◽  
Nitrogen Addition ◽  
Fertilizer Application ◽  
Carotenoid Content ◽  
Leaf Biomass ◽  
Total Biomass ◽  
Nitrogen And Phosphorus ◽  
Randomized Design

Background: Fertilizer application combined with successive foliage cuttings can positively affect plant growth, yield and quality. The objective of this study was to evaluate the response of chipilín to successive foliage cuttings and nitrogen and phosphate fertilizer application under greenhouse conditions. Methods: During 2018, an experiment was carried out in a greenhouse under a completely randomized design, with six replications of each treatment. The treatments were as follows: control, 100 kg ha-1 N as urea and 60 kg ha-1 P2O5 as triple superphosphate. The fertilizers were applied one month after planting (MAP). Two MAPs, uniform cuttings were performed, followed by three successive cuttings, with one every 30 days. At each cutting, the traits evaluated included the number of new shoots; the length, diameter, leaf area and dry biomass of the new shoots by component (leaves and stems); the relative growth rate (RGR) of the biomass of the shoot leaves, the chlorophyll (a, b and total) and carotenoid content and NDVI. Result: Cutting foliage every 30 days increased (p less than 0.05) the number of new shoots, leaf biomass, total biomass and leaf area, but reduced the length and diameter of the shoots. There was no effect (p greater than 0.05) of cutting on root biomass or nodulation, but there was an effect of fertilizer application, with both variables decreasing with nitrogen addition.

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