scholarly journals The effect of soil pH and dicyandiamide (DCD) on N2O emissions and ammonia oxidiser abundance in a stimulated grazed pasture soil

2014 ◽  
Vol 14 (8) ◽  
pp. 1434-1444 ◽  
Author(s):  
Aimee Robinson ◽  
Hong Jie Di ◽  
Keith C. Cameron ◽  
Andriy Podolyan ◽  
Jizheng He
Keyword(s):  
Soil Ph ◽  
N2o Emissions ◽  
Grazed Pasture ◽  
Pasture Soil

Biochar mitigates the N2O emissions from acidic soil by increasing the nosZ and nirK gene abundance and soil pH

2020 ◽  
Vol 255 ◽  
pp. 109891 ◽  
Author(s):  
Muhammad Aamer ◽  
Muhammad Shaaban ◽  
Muhammad Umair Hassan ◽  
Huang Guoqin ◽  
Liu Ying ◽  
...  
Keyword(s):  
Soil Ph ◽  
Acidic Soil ◽  
N2o Emissions ◽  
Gene Abundance ◽  
Nirk Gene

scholarly journals Fertiliser and seasonal urine effects on N2O emissions from the urine-fertiliser interface of a grazed pasture

2015 ◽  
Vol 58 (3) ◽  
pp. 311-324 ◽  
Author(s):  
LE Buckthought ◽  
TJ Clough ◽  
KC Cameron ◽  
HJ Di ◽  
MA Shepherd
Keyword(s):  
N2o Emissions ◽  
Grazed Pasture

Decreased N2O reduction by low soil pH causes high N2O emissions in a riparian ecosystem

Geobiology ◽  
2011 ◽  
Vol 9 (3) ◽  
pp. 294-300 ◽  
Author(s):  
R. N. VAN DEN HEUVEL ◽  
S. E. BAKKER ◽  
M. S. M. JETTEN ◽  
M. M. HEFTING
Keyword(s):  
Soil Ph ◽  
N2o Emissions ◽  
N2o Reduction ◽  
Riparian Ecosystem

scholarly journals Effects of fertilization and stand age on N<sub>2</sub>O and NO emissions from tea plantations: A site-scale study in a subtropical region using a modified biogeochemical model

2020 ◽  
Author(s):  
Wei Zhang ◽  
Zhisheng Yao ◽  
Xunhua Zheng ◽  
Chunyan Liu ◽  
Rui Wang ◽  
...  
Keyword(s):  
Soil Ph ◽  
Process Model ◽  
Early Stage ◽  
Stand Age ◽  
Biogeochemical Model ◽  
N2o Emissions ◽  
Model Based ◽  
Ph Reduction ◽  
Tea Plantations ◽  
No Emissions

Abstract. To meet increasing demands, tea plantations are rapidly expanding in China. Although the emissions of nitrous oxide (N2O) and nitric oxide (NO) from tea plantations may be substantially influenced by soil pH reduction and intensive nitrogen fertilization, process model-based studies on this issue are still rare. In this study, the process-oriented biogeochemical model, Catchment Nutrient Management Model – DeNitrification-DeComposition (CNMM-DNDC), was modified by adding tea growth-related processes that may induce a soil pH reduction. Using a dataset for intensively managed tea plantations at a subtropical site, the performances of the original and modified models for simulating the emissions of both gases subject to different fertilization alternatives and stand ages were evaluated. Compared with the observations in early stage of a tea plantation, the original and modified models showed comparable performances for simulating the daily gas fluxes (with Nash-Sutcliffe index (NSI) of 0.10 versus 0.18 for N2O and 0.32 versus 0.33 for NO), annual emissions (with NSI of 0.81 versus 0.94 for N2O and 0.92 versus 0.94 for NO) and annual direct emission factors (EFds). The observations and simulations consistently demonstrated that short-term replacement of urea with oilcake stimulated N2O emissions by ~ 62 % and ~ 36 % and mitigated NO emissions by ~ 25 % and ~ 14 %, respectively. The model simulations resulted in a positive dependence of EFd of either gas against nitrogen doses, implicating the importance of model-based quantification of this key parameter for inventory. In addition, the modified model with pH-related scientific processes showed overall inhibitory effects on the gases emissions in the mid to later stages during a full tea lifetime. In conclusion, the modified CNMM-DNDC exhibits the potential for quantifying N2O and NO emissions from tea plantations under various conditions. Nevertheless, wider validation is still required for simulation of long-term soil pH variations and emissions of both gases from tea plantations.

Determining nitrous oxide emissions from subsurface measurements in grazed pasture: A field trial of alternative technology

Soil Research ◽  
2005 ◽  
Vol 43 (6) ◽  
pp. 677 ◽  
Author(s):  
Z. Li ◽  
F. M. Kelliher
Keyword(s):  
N2o Emission ◽  
Gas Diffusion ◽  
Nitrous Oxide Emissions ◽  
Spatial And Temporal Variation ◽  
Measurement Technology ◽  
N2o Emissions ◽  
Emission Measurement ◽  
N2o Production ◽  
Grazed Pasture ◽  
Poorly Drained Soils

Beneath pasture grazed by farmed animals, the soil’s nitrogen (N), oxygen, and temperature regimes can be unevenly distributed in time and space. It is difficult to capture spatial and temporal variation of N2O using conventional emission measurement technology based on gas samples taken in chambers that briefly cover a small area of the soil’s surface. We report the results from field deployment of alternative, non-intrusive N2O emission measurement technology that uses subsurface measurements incorporating the soil processes controlling the net N2O production and gas diffusion rates. During 100 autumn and winter days after dairy cattle urine was applied (650 kg N/ha) to freely and poorly drained pastoral soils near Hamilton, New Zealand (37.8° S, 175.3° E), N2O emissions were determined. The measured values ranged from 0.024 to 1.55 and 0.048 to 3.33 mg N2O-N/m2.h for the freely and poorly drained soils, respectively. Over the 100 days, it was estimated that 0.4 and 1.3% of the applied N was directly emitted to the atmosphere as N2O from the freely and poorly drained soils, respectively.

Influence of soil pH on NOxand N2O emissions from bovine urine applied to soil columns

2011 ◽  
Vol 54 (4) ◽  
pp. 285-301 ◽  
Author(s):  
S Khan ◽  
TJ Clough ◽  
KM Goh ◽  
RR Sherlock
Keyword(s):  
Soil Ph ◽  
N2o Emissions ◽  
Soil Columns ◽  
Bovine Urine
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