Effects of soil moisture on gross N transformations and N2O emission in acid subtropical forest soils

2014 ◽  
Vol 50 (7) ◽  
pp. 1099-1108 ◽  
Author(s):  
Yi Cheng ◽  
Jing Wang ◽  
Shen-Qiang Wang ◽  
Jin-Bo Zhang ◽  
Zu-Cong Cai
Keyword(s):  
Soil Moisture ◽  
Forest Soils ◽  
N2o Emission ◽  
Subtropical Forest ◽  
N Transformations ◽  
Gross N Transformations

scholarly journals Soil nitrogen transformation responses to seasonal precipitation changes are regulated by changes in functional microbial abundance in a subtropical forest

2017 ◽  
Vol 14 (9) ◽  
pp. 2513-2525 ◽  
Author(s):  
Jie Chen ◽  
Guoliang Xiao ◽  
Yakov Kuzyakov ◽  
G. Darrel Jenerette ◽  
Ying Ma ◽  
...  
Keyword(s):  
N Mineralization ◽  
N2o Emission ◽  
Dry Season ◽  
Subtropical Forest ◽  
Microbial Abundance ◽  
Wet Season ◽  
N Transformations ◽  
Net Nitrification ◽  
N Transformation ◽  
Precipitation Changes

Abstract. The frequency of dry-season droughts and wet-season storms has been predicted to increase in subtropical areas in the coming decades. Since subtropical forest soils are significant sources of N2O and NO3−, it is important to understand the features and determinants of N transformation responses to the predicted precipitation changes. A precipitation manipulation field experiment was conducted in a subtropical forest to reduce dry-season precipitation and increase wet-season precipitation, with annual precipitation unchanged. Net N mineralization, net nitrification, N2O emission, nitrifying (bacterial and archaeal amoA) and denitrifying (nirK, nirS and nosZ) gene abundance, microbial biomass carbon (MBC), extractable organic carbon (EOC), NO3−, NH4+ and soil water content (SWC) were monitored to characterize and explain soil N transformation responses. Dry-season precipitation reduction decreased net nitrification and N mineralization rates by 13–20 %, while wet-season precipitation addition increased both rates by 50 %. More than 20 % of the total variation of net nitrification and N mineralization could be explained by microbial abundance and SWC. Notably, archaeal amoA abundance showed the strongest correlation with net N transformation rates (r  ≥  0.35), suggesting the critical role of archaeal amoA abundance in determining N transformations. Increased net nitrification in the wet season, together with large precipitation events, caused substantial NO3− losses via leaching. However, N2O emission decreased moderately in both dry and wet seasons due to changes in nosZ gene abundance, MBC, net nitrification and SWC (decreased by 10–21 %). We conclude that reducing dry-season precipitation and increasing wet-season precipitation affect soil N transformations through altering functional microbial abundance and MBC, which are further affected by changes in EOC and NH4+ availabilities.

Gross N transformations vary with soil moisture and time following urea deposition to a pasture soil

Geoderma ◽  
2021 ◽  
Vol 386 ◽  
pp. 114904
Author(s):  
David Rex ◽  
Timothy J. Clough ◽  
Gary J. Lanigan ◽  
Anne B. Jansen-Willems ◽  
Leo M. Condron ◽  
...  
Keyword(s):  
Soil Moisture ◽  
N Transformations ◽  
Pasture Soil ◽  
Gross N Transformations

scholarly journals Effect of carbon and nitrogen addition on nitrous oxide and carbon dioxide fluxes from thawing forest soils

2017 ◽  
Vol 31 (3) ◽  
pp. 339-349 ◽  
Author(s):  
Wu Haohao ◽  
Xu Xingkai ◽  
Duan Cuntao ◽  
Li TuanSheng ◽  
Cheng Weiguo
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Soil Moisture ◽  
Organic Carbon ◽  
Dissolved Organic Carbon ◽  
Forest Soils ◽  
Mixed Forest ◽  
Soil Core ◽  
Total N ◽  
Nitrogen Inputs

AbstractPacked soil-core incubation experiments were done to study the effects of carbon (glucose, 6.4 g C m−2) and nitrogen (NH4Cl and KNO3, 4.5 g N m−2) addition on nitrous oxide (N2O) and carbon dioxide (CO2) fluxes during thawing of frozen soils under two forest stands (broadleaf and Korean pine mixed forest and white birch forest) with two moisture levels (55 and 80% water-filled pore space). With increasing soil moisture, the magnitude and longevity of the flush N2O flux from forest soils was enhanced during the early period of thawing, which was accompanied by great NO3−-N consumption. Without N addition, the glucose-induced cumulative CO2fluxes ranged from 9.61 to 13.49 g CO2-C m−2, which was larger than the dose of carbon added as glucose. The single addition of glucose increased microbial biomass carbon but slightly affected soil dissolved organic carbon pool. Thus, the extra carbon released upon addition of glucose can result from the decomposition of soil native organic carbon. The glucose-induced N2O and CO2fluxes were both significantly correlated to the glucose-induced total N and dissolved organic carbon pools and influenced singly and interactively by soil moisture and KNO3addition. The interactive effects of glucose and nitrogen inputs on N2O and CO2fluxes from forest soils after frost depended on N sources, soil moisture, and vegetation types.

scholarly journals Lag Times as Indicators of Hydrological Mechanisms Responsible for NO3-N Flushing in a Forested Headwater Catchment

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1092
Author(s):  
Klaudija Sapač ◽  
Andrej Vidmar ◽  
Nejc Bezak ◽  
Simon Rusjan
Keyword(s):  
Soil Moisture ◽  
Linear Regression ◽  
Forest Soils ◽  
Nutrient Dynamics ◽  
Precipitation Amount ◽  
Lag Time ◽  
Nutrient Loss ◽  
Time Step ◽  
Lag Times ◽  
N Flux

Understanding the temporal variability of the nutrient transport from catchments is essential for planning nutrient loss reduction measures related to land use and climate change. Moreover, observations and analysis of nutrient dynamics in streams draining undisturbed catchments are known to represent a reference point by which human-influenced catchments can be compared. In this paper, temporal dynamics of nitrate-nitrogen (NO3-N) flux are investigated on an event basis by analysing observed lag times between data series. More specifically, we studied lag times between the centres of mass of six hydrological and biogeochemical variables, namely discharge, soil moisture at three depths, NO3-N flux, and the precipitation hyetograph centre of mass. Data obtained by high-frequency measurements (20 min time step) from 29 events were analysed. Linear regression and multiple linear regression (MLR) were used to identify relationships between lag times of the above-mentioned processes. We found that discharge lag time (LAGQ) and NO3-N flux lag time (LAGN) are highly correlated indicating similar temporal response to rainfall. Moreover, relatively high correlation between LAGN and soil moisture lag times was also detected. The MLR model showed that the most descriptive variable for both LAGN and LAGQ is amount of precipitation. For LAGN, the change of the soil moisture in the upper two layers was also significant, suggesting that the lag times indicate the primarily role of the forest soils as the main source of the NO3-N flux, whereas the precipitation amount and the runoff formation through the forest soils are the main controlling mechanisms.

scholarly journals Influence of tree species on gross and net N transformations in forest soils

2007 ◽  
Vol 64 (2) ◽  
pp. 151-158 ◽  
Author(s):  
Bernd Zeller ◽  
Sylvie Recous ◽  
Morgan Kunze ◽  
Judicaël Moukoumi ◽  
Micheline Colin-Belgrand ◽  
...  
Keyword(s):  
Forest Soils ◽  
Tree Species ◽  
N Transformations

Soil nitrogen dynamics in irrigated maize systems as impacted on by nitrogen and stubble management

2008 ◽  
Vol 48 (3) ◽  
pp. 382 ◽  
Author(s):  
R. B. Edis ◽  
D. Chen ◽  
G. Wang ◽  
D. A. Turner ◽  
K. Park ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Soil Nitrogen ◽  
Field Measurements ◽  
N2o Emission ◽  
N Recovery ◽  
Mineral N ◽  
N Transformations ◽  
Ammonium Thiosulfate ◽  
Stubble Retention ◽  
The Difference

The soil nitrogen (N) dynamics of an irrigated maize system in which stubble retention and stubble burned treatments were superimposed over treatments of varying N fertiliser rate were studied. The field site was near Whitton, New South Wales, Australia, and the work described here is part a life cycle analysis of greenhouse gas emissions from maize project. The objective of this part of the work was to quantify the fate of fertiliser N applied at the site. Field measurements of denitrification, mineral N content and recovery of 15N-labelled urea from microplots with and without ammonium thiosulfate were complimented with laboratory studies of denitrification and nitrous oxide (N2O) flux. Significantly (P < 0.05) more fertiliser N was recovered in the grain from the stubble incorporated treatment than the stubble burned treatment and there was greater recovery of fertiliser N in the soil at the end of the experiment in the stubble burned treatment. This may indicate that fertiliser N applied to the stubble burned system may be more exposed to soil-N transformations. The reason for the difference in uptake and soil residual is not clear but may be related to soil structure differences leading to less plant accessibility of N in the burned treatment. This difference may lead to more nitrous oxide emission from soil in the stubble burned treatments. Short-term (1 h) static chamber measurements in the field found a strong N-rate dependence of N2O emission rate for fertiliser rates between 0 and 300 kg N/ha. Inclusion of ammonium thiosulfate in the fertiliser formulation did not appear to have a significant impact on fertiliser N recovery.

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