scholarly journals Effects of Salt on Root Aeration, Nitrification, and Nitrogen Uptake in Mangroves

Forests ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 1131 ◽  
Author(s):  
Yan Zhao ◽  
Xun Wang ◽  
Youshao Wang ◽  
Zhaoyu Jiang ◽  
Xiaoyu Ma ◽  
...  
Keyword(s):  
N Uptake ◽  
Avicennia Marina ◽  
Root Anatomy ◽  
Root Porosity ◽  
Soil Nitrification ◽  
Ammonia Oxidizing Archaea ◽  
Gene Copies ◽  
Negative Effect ◽  
Moderate Salinity ◽  
Root Aeration

The potential effects of salt on the growth, root anatomy, radial oxygen loss (ROL), and nitrogen (N) dynamics in mangroves were investigated using the seedlings of Avicennia marina (Forsk.) Vierh. The results showed that a moderate salinity (200 mM NaCl) appeared to have little negative effect on the growth of A. marina. However, higher salt stresses (400 and 600 mM NaCl) significantly inhibited the biomass yield. Concentrations of N in the roots and leaves decreased sharply with increasing salinity. Nevertheless, the presence of salt directly altered root anatomy (e.g., reduced root porosity and promoted suberization within the exodermis and endodermis), leading to a significant reduction in ROL. The results further showed that reduced ROL induced by salt could restrain soil nitrification, resulting in less ammonia-oxidizing archaea and bacteria (AOA and AOB) gene copies and lower concentrations of NO3− in the soils. While increased root suberization induced by salt inhibited NH4+ and NO3− uptake and influx into the roots. In summary, this study indicated that inhibited root aeration may be a defense response to salt, however these root symptoms were not advantageous for rhizosphere nitrification and N uptake by A. marina.

scholarly journals Ammonia-oxidizing archaea are integral to nitrogen cycling in a highly fertile agricultural soil

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Laibin Huang ◽  
Seemanti Chakrabarti ◽  
Jennifer Cooper ◽  
Ana Perez ◽  
Sophia M. John ◽  
...  
Keyword(s):  
Nitrogen Cycle ◽  
Agricultural Soil ◽  
Agricultural Soils ◽  
Ammonia Oxidizing Bacteria ◽  
Central Process ◽  
Soil Nitrification ◽  
Plant Nitrogen ◽  
Ammonia Oxidizing Archaea ◽  
Activity Measurements ◽  
Nitrite Oxidizing Bacteria

AbstractNitrification is a central process in the global nitrogen cycle, carried out by a complex network of ammonia-oxidizing archaea (AOA), ammonia-oxidizing bacteria (AOB), complete ammonia-oxidizing (comammox) bacteria, and nitrite-oxidizing bacteria (NOB). Nitrification is responsible for significant nitrogen leaching and N2O emissions and thought to impede plant nitrogen use efficiency in agricultural systems. However, the actual contribution of each nitrifier group to net rates and N2O emissions remain poorly understood. We hypothesized that highly fertile agricultural soils with high organic matter mineralization rates could allow a detailed characterization of N cycling in these soils. Using a combination of molecular and activity measurements, we show that in a mixed AOA, AOB, and comammox community, AOA outnumbered low diversity assemblages of AOB and comammox 50- to 430-fold, and strongly dominated net nitrification activities with low N2O yields between 0.18 and 0.41 ng N2O–N per µg NOx–N in cropped, fallow, as well as native soil. Nitrification rates were not significantly different in plant-covered and fallow plots. Mass balance calculations indicated that plants relied heavily on nitrate, and not ammonium as primary nitrogen source in these soils. Together, these results imply AOA as integral part of the nitrogen cycle in a highly fertile agricultural soil.

scholarly journals Soil ammonia-oxidizing archaea in a paddy field with different irrigation and fertilization managements

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Limin Wang ◽  
Dongfeng Huang
Keyword(s):  
Ammonia Oxidation ◽  
Chemical Properties ◽  
Paddy Soils ◽  
Soil Nitrification ◽  
Treated Soil ◽  
Ammonia Oxidizing Archaea ◽  
Rice Yields ◽  
Traditional Irrigation ◽  
Almost All ◽  
And Function

AbstractBecause ammonia-oxidizing archaea (AOA) are ubiquitous and highly abundant in almost all terrestrial soils, they play an important role in soil nitrification. However, the changes in the structure and function of AOA communities and their edaphic drivers in paddy soils under different fertilization and irrigation regimes remain unclear. In this study, we investigated AOA abundance, diversity and activity in acid paddy soils by a field experiment. Results indicated that the highest potential ammonia oxidation (PAO) (0.011 μg NO 2 -  –N g-1 d.w.day-1) was found in T2 (optimal irrigation and fertilization)—treated soils, whereas the lowest PAO (0.004 μg NO 2 -  –N g-1 d.w.day-1) in T0 (traditional irrigation)- treated soils. Compared with the T0—treated soil, the T2 treatment significantly (P < 0.05) increased AOA abundances. Furthermore, the abundance of AOA was significantly (P < 0.01) positively correlated with pH, soil organic carbon (SOC), and PAO. Meanwhile, pH and SOC content were significantly (P < 0.05) higher in the T2—treated soil than those in the T1 (traditional irrigation and fertilization)- treated soil. In addition, these two edaphic factors further influenced the AOA community composition. The AOA phylum Crenarchaeota was mainly found in the T2—treated soils. Phylogenetic analysis revealed that most of the identified OTUs of AOA were mainly affiliated with Crenarchaeota. Furthermore, the T2 treatment had higher rice yield than the T0 and T1 treatments. Together, our findings confirm that T2 might ameliorate soil chemical properties, regulate the AOA community structure, increase the AOA abundance, enhance PAO and consequently maintain rice yields in the present study.

Leaf leachates have the potential to influence soil nitrification via changes in ammonia‐oxidizing archaea and bacteria populations

2019 ◽  
Author(s):  
W. B. Chen ◽  
B. M. Chen ◽  
H. X. Liao ◽  
J. Q. Su ◽  
S. L. Peng
Keyword(s):  
Soil Nitrification ◽  
Ammonia Oxidizing Archaea

scholarly journals Similarity and diversity in adventitious root anatomy as related to root aeration among a range of wetland and dryland grass species

2002 ◽  
Vol 25 (3) ◽  
pp. 441-451 ◽  
Author(s):  
M. P. McDonald ◽  
N. W. Galwey ◽  
T. D. Colmer
Keyword(s):  
Adventitious Root ◽  
Root Anatomy ◽  
Grass Species ◽  
Root Aeration

scholarly journals Community Structure of Ammonia-Oxidizing Archaea and Ammonia-Oxidizing Bacteria in Soil Treated with the Insecticide Imidacloprid

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Mariusz Cycoń ◽  
Zofia Piotrowska-Seget
Keyword(s):  
Community Structure ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Wiener Index ◽  
Nitrification Rate ◽  
Ammonia Oxidizing Bacteria ◽  
Community Members ◽  
Insecticide Treatment ◽  
Soil Nitrification ◽  
Ammonia Oxidizing Archaea ◽  
Gradient Gel Electrophoresis

The purpose of this experiment was to assess the effect of imidacloprid on the community structure of ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soil using the denaturing gradient gel electrophoresis (DGGE) approach. Analysis showed that AOA and AOB community members were affected by the insecticide treatment. However, the calculation of the richness (S) and the Shannon-Wiener index (H) values for soil treated with the field rate (FR) dosage of imidacloprid (1 mg/kg soil) showed no changes in measured indices for the AOA and AOB community members. In turn, the10*FRdosage of insecticide (10 mg/kg soil) negatively affected the AOA community, which was confirmed by the decrease of theSandHvalues in comparison with the values obtained for the control soil. In the case of AOB community, an initial decline followed by the increase of theSandHvalues was obtained. Imidacloprid decreased the nitrification rate while the ammonification process was stimulated by the addition of imidacloprid. Changes in the community structure of AOA and AOB could be due to an increase in the concentration of N-NH4+, known as the most important factor which determines the contribution of these microorganisms to soil nitrification.

scholarly journals Comparison of Grain Yield and Some Characteristics of Hulled, Durum and Bread Wheat Genotypes Varieties

2017 ◽  
Vol 5 (2) ◽  
pp. 159 ◽  
Author(s):  
Bekir Atar ◽  
Burhan Kara
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
N Uptake ◽  
Grain Protein Content ◽  
First Year ◽  
Wheat Varieties ◽  
Hulled Wheat ◽  
Hulled Wheats ◽  
Negative Effect ◽  
Second Year

In spite of the low grain yield they produce, the hulled wheat have become even more important in recent years because of their resistance to negative environmental conditions and healthy nutritional content. The research was carry out in order to comparison the yield and yield characteristics of durum (Kiziltan-91 and C-1252), hulled (Einkorn and Emmer) and bread wheat (Tir) varieties in Isparta ecological conditions in 2013-14 and 2014-15 vegetation periods. In both years, the highest grain yield was obtained in Kiziltan-91 variety (3992 and 3758 kg ha-1 respectively). The grain yield of hulled wheats in the first year (Einkorn 1269 kg ha-1, Emmer 2125 kg ha-1) was around Turkey averages. However, grain yield decreased of commercial wheat varieties due to the negative effect of high amount of rainfall in June in the second year, but considerably increased in (Einkorn 2150 kg ha-1, Emmer 2533 kg ha-1). N uptake was found to be lower in the than durum wheats. In terms of grain protein content, the highest values were obtained in Emmer variety (16.4%-15.3%).

scholarly journals Relative Abundance of Ammonia Oxidizing Archaea and Bacteria Influences Soil Nitrification Responses to Temperature

2019 ◽  
Vol 7 (11) ◽  
pp. 526 ◽  
Author(s):  
Hussnain Mukhtar ◽  
Yu-Pin Lin ◽  
Chiao-Ming Lin ◽  
Yann-Rong Lin
Keyword(s):  
Temperature Gradient ◽  
Relative Abundance ◽  
Temperature Response ◽  
Rate Theory ◽  
Fixed Temperature ◽  
Soil Nitrification ◽  
Ammonia Oxidizing Archaea ◽  
Different Temperatures ◽  
Order Of Magnitude ◽  
The Impact

Ammonia oxidizing archaea (AOA) and bacteria (AOB) are thought to contribute differently to soil nitrification, yet the extent to which their relative abundances influence the temperature response of nitrification is poorly understood. Here, we investigated the impact of different AOA to AOB ratios on soil nitrification potential (NP) across a temperature gradient from 4 °C to 40 °C in twenty different organic and inorganic fertilized soils. The temperature responses of different relative abundance of ammonia oxidizers for nitrification were modeled using square rate theory (SQRT) and macromolecular rate theory (MMRT) models. We found that the proportional nitrification rates at different temperatures varied among AOA to AOB ratios. Predicted by both models, an optimum temperature (Topt) for nitrification in AOA dominated soils was significantly higher than for soils where AOA and AOB abundances are within the same order of magnitude. Moreover, the change in heat capacity ( Δ C P ‡ ) associated with the temperature dependence of nitrification was positively correlated with Topt and significantly varied among the AOA to AOB ratios. The temperature ranges for NP decreased with increasing AOA abundance for both organic and inorganic fertilized soils. These results challenge the widely accepted approach of comparing NP rates in different soils at a fixed temperature. We conclude that a shift in AOA to AOB ratio in soils exhibits distinguished temperature-dependent characteristics that have an important impact on nitrification responses across the temperature gradient. The proposed approach benefits the accurate discernment of the true contribution of fertilized soils to nitrification for improvement of nitrogen management.

scholarly journals Nitrogen recovery and dry matter production of silage maize (Zea mays L.) as affected by subsurface band application of mineral nitrogen fertilizer

1998 ◽  
Vol 46 (2) ◽  
pp. 139-155 ◽  
Author(s):  
W. Van Dijk ◽  
G. Brouwer
Keyword(s):  
Dry Matter ◽  
Field Experiments ◽  
N Uptake ◽  
N Fertilizer ◽  
N Recovery ◽  
Mineral N ◽  
Positive Effects ◽  
Silage Maize ◽  
Matter Production ◽  
Negative Effect

In 1991-94 the effects of subsurface band application of mineral N fertilizer on the N recovery and dry matter (DM) yield of silage maize were studied in nine field experiments on sandy and clay soils in the Netherlands. In the early crop stages and especially in the clay soil experiments, banded N had a significant negative effect on the N uptake and DM yield compared to broadcast N, possibly due to salt damage. At final harvest, however, banding significantly increased the N uptake and DM yield in most of the experiments. The apparent N recovery increased by circa 20-25% (absolute). The positive effects indicated that band application improved the efficiency of the N fertilizer. It could be calculated that banding allowed a reduction in the N rate of 20-30% without significant effects on the N uptake and DM yield of the silage maize. Benefits of banding were positively (P

Root Aeration and Respiration in Young Mangrove Plants (Avicennia marina(Forsk.) Vierh.)

1986 ◽  
Vol 37 (8) ◽  
pp. 1225-1233 ◽  
Author(s):  
M. CURRAN ◽  
M. COLE ◽  
W. G. ALLAWAY
Keyword(s):  
Avicennia Marina ◽  
Mangrove Plants ◽  
Root Aeration

scholarly journals The Response of Estuarine Ammonia-Oxidizing Communities to Constant and Fluctuating Salinity Regimes

2020 ◽  
Vol 11 ◽  
Author(s):  
João Pereira Santos ◽  
António G. G. Sousa ◽  
Hugo Ribeiro ◽  
Catarina Magalhães
Keyword(s):  
Ammonia Oxidation ◽  
Estuarine Sediments ◽  
Ammonia Oxidizer ◽  
Rrna Gene ◽  
Ammonia Oxidizing Bacteria ◽  
Salinity Regime ◽  
Salinity Fluctuation ◽  
Ammonia Oxidizing Archaea ◽  
Negative Effect ◽  
The Impact

Aerobic nitrification is a fundamental nitrogen biogeochemical process that links the oxidation of ammonia to the removal of fixed nitrogen in eutrophicated water bodies. However, in estuarine environments there is an enormous variability of water physicochemical parameters that can affect the ammonia oxidation biological process. For instance, it is known that salinity can affect nitrification performance, yet there is still a lack of information on the ammonia-oxidizing communities behavior facing daily salinity fluctuations. In this work, laboratory experiments using upstream and downstream estuarine sediments were performed to address this missing gap by comparing the effect of daily salinity fluctuations with constant salinity on the activity and diversity of ammonia-oxidizing microorganisms (AOM). Activity and composition of AOM were assessed, respectively by using nitrogen stable isotope technique and 16S rRNA gene metabarcoding analysis. Nitrification activity was negatively affected by daily salinity fluctuations in upstream sediments while no effect was observed in downstream sediments. Constant salinity regime showed clearly higher rates of nitrification in upstream sediments while a similar nitrification performance between the two salinity regimes was registered in the downstream sediments. Results also indicated that daily salinity fluctuation regime had a negative effect on both ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA) community’s diversity. Phylogenetically, the estuarine downstream AOM were dominated by AOA (0.92–2.09%) followed by NOB (0.99–2%), and then AOB (0.2–0.32%); whereas NOB dominated estuarine upstream sediment samples (1.4–9.5%), followed by AOA (0.27–0.51%) and AOB (0.01–0.23%). Analysis of variance identified the spatial difference between samples (downstream and upstream) as the main drivers of AOA and AOB diversity. Our study indicates that benthic AOM inhabiting different estuarine sites presented distinct plasticity toward the salinity regimes tested. These findings help to improve our understanding in the dynamics of the nitrogen cycle of estuarine systems by showing the resilience and consequently the impact of different salinity regimes on the diversity and activity of ammonia oxidizer communities.

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