Gaseous nitrogen losses from a forest site in the North Tyrolean Limestone Alps

2002 ◽  
Vol 9 (S2) ◽  
pp. 23-30 ◽  
Author(s):  
Elisabeth Härtel ◽  
Sophie Zechmeister-Boltenstern ◽  
Martin Gerzabek
Keyword(s):  
Nitrogen Losses ◽  
Forest Site ◽  
Gaseous Nitrogen ◽  
The North ◽  
Limestone Alps

Water and nitrate fluxes at a forest site in the North Tyrolean Limestone Alps

2002 ◽  
Vol 9 (S2) ◽  
pp. 31-36 ◽  
Author(s):  
Franz Feichtinger ◽  
Stefan Smidt ◽  
Eduard Klaghofer
Keyword(s):  
Forest Site ◽  
The North ◽  
Limestone Alps

Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain

Soil Research ◽  
2002 ◽  
Vol 40 (5) ◽  
pp. 737 ◽  
Author(s):  
R. E. White ◽  
G. Cai ◽  
D. Chen ◽  
X. H. Fan ◽  
A. Pacholski ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
N2o Emission ◽  
Nitrogen Losses ◽  
Soil Core ◽  
15N Balance ◽  
Gaseous Nitrogen ◽  
Deep Placement ◽  
The North ◽  
The North China Plain

Gaseous nitrogen losses, by NH3 volatilisation and denitrification, are mainly responsible for the low recovery of N fertiliser applied to irrigated maize on the North China Plain. Two field experiments were conducted to measure NH3 volatilisation and nitrification-denitrification losses from urea applied to maize (Zea mays L.) grown on a calcareous fluvo-aquic soil (Aquic Inceptisol) in Fengqiu County, Henan Province. The first was carried out in June 1998 (urea applied at 75 kg N/ha 3 weeks after sowing), and the second in July 1998 (urea applied at 200 kg N/ha 6 weeks after sowing). Each experiment included 3 treatments-control, surface-broadcast (SB), and deep point placement (DP) or broadcast followed by irrigation (BI). NH3 loss was measured by a micrometeorological method (NH3 sampler). Denitrification (N2 + N2O) was measured by the acetylene inhibition-intact soil core technique, and N2O emission was also measured in the absence of acetylene. The recovery of applied N was measured by a 15N balance technique. When urea was surface broadcast (SB) 3weeks (75 kg N/ha) and 6weeks (200 kg N/ha) after sowing, 44 and 48% of the applied N was lost by NH3 volatilisation, respectively. The corresponding losses from the BI and DP treatments were only 18% and 11%, respectively. Denitrification was a significant process in this well-drained sandy soil, with average loss rates of 0.26-0.43 kg N/ha.day in the controls (from resident soil N), compared with 0.52-0.63 kg N/ha.day in the surface fertiliser treatments. Deep placement of urea reduced the denitrification rate to an average of 0.3 kg N/ha.day. The net denitrification loss from the fertiliser was <2% of the applied N, except for the SB urea treatment in the second experiment. The application of N fertiliser as urea increased N2O emissions from c. 0.3 to c. 2.3 kg N/ha over 57 days in the second experiment, with average N2O emission rates in the control and SB treatment of 0.006 and 0.042 kg N/ha.day, respectively. The significantly lower ratio of N2 /N2O in the urea treatments compared with the control suggested that nitrification of applied N may have contributed to N2O production. Alternatively, the ratio of N2 /N2O during denitrification may have changed with the greater supply of NO3 -. denitrification, maize, NH3 volatilisation, N2O emission.

Gaseous nitrogen losses from plants

1983 ◽  
pp. 159-180 ◽  
Author(s):  
G. D. Farquhar ◽  
R. Wetselaar ◽  
B. Weir
Keyword(s):  
Nitrogen Losses ◽  
Gaseous Nitrogen

Changes in Vegetation Condition and Surface Fluxes during NAME 2004

2007 ◽  
Vol 20 (9) ◽  
pp. 1810-1820 ◽  
Author(s):  
Christopher J. Watts ◽  
Russell L. Scott ◽  
Jaime Garatuza-Payan ◽  
Julio C. Rodriguez ◽  
John H. Prueger ◽  
...  
Keyword(s):  
Surface Temperature ◽  
Land Surface Temperature ◽  
North American ◽  
Land Surface ◽  
Vegetation Index ◽  
Surface Fluxes ◽  
North American Monsoon ◽  
Forest Site ◽  
The North ◽  
Dry Spell

Abstract The vegetation in the core region of the North American monsoon (NAM) system changes dramatically after the onset of the summer rains so that large changes may be expected in the surface fluxes of radiation, heat, and moisture. Most of this region lies in the rugged terrain of western Mexico and very few measurements of these fluxes have been made in the past. Surface energy balance measurements were made at seven sites in Sonora, Mexico, and Arizona during the intensive observation period (IOP) of the North American Monsoon Experiment (NAME) in summer 2004 to better understand how land surface vegetation change alters energy flux partitioning. Satellite data were used to obtain time series for vegetation indices and land surface temperature for these sites. The results were analyzed to contrast conditions before the onset of the monsoon with those afterward. As expected, precipitation during the 2004 monsoon was highly variable from site to site, but it fell in greater quantities at the more southern sites. Likewise, large changes in the vegetation index were observed, especially for the subtropical sites in Sonora. However, the changes in the broadband albedo were very small, which was rather surprising. The surface net radiation was consistent with the previous observations, being largest for surfaces that are transpiring and cool, and smallest for surfaces that are dry and hot. The largest evaporation rates were observed for the subtropical forest and riparian vegetation sites. The evaporative fraction for the forest site was highly correlated with its vegetation index, except during the dry spell in August. This period was clearly detected in the land surface temperature data, which rose steadily in this period to a maximum at its end.

Estimating Non-Gaseous Nitrogen Losses from Established Turf

1994 ◽  
Vol 1 (1) ◽  
pp. 17-30 ◽  
Author(s):  
E. S. Hesketh ◽  
R. J. Hull ◽  
A. J. Gold
Keyword(s):  
Nitrogen Losses ◽  
Gaseous Nitrogen

Nitrogen fluxes on an intensive investigation plot in the North Tyrolean limestone Alps

2002 ◽  
Vol 9 (S2) ◽  
pp. 3-9 ◽  
Author(s):  
Friedl Herman ◽  
Stefan Smidt ◽  
Michael Englisch ◽  
Manfred Gärtner ◽  
Robert Jandl ◽  
...  
Keyword(s):  
Nitrogen Fluxes ◽  
The North ◽  
Limestone Alps ◽  
Intensive Investigation

Gaseous nitrogen losses from a grassland area used for overwintering cattle

2006 ◽  
Vol 1293 ◽  
pp. 343-346
Author(s):  
M. Šimek ◽  
R.J. Stevens ◽  
R.J. Laughlin ◽  
J. Hynšt ◽  
P. Brůček ◽  
...  
Keyword(s):  
Nitrogen Losses ◽  
Gaseous Nitrogen

Control of gaseous nitrogen losses from urea applied to flooded rice soils

1988 ◽  
Vol 18 (1) ◽  
pp. 31-47 ◽  
Author(s):  
J. R. Simpson ◽  
W. A. Muirhead ◽  
K. H. Bowmer ◽  
G. X. Cai ◽  
J. R. Freney
Keyword(s):  
Nitrogen Losses ◽  
Gaseous Nitrogen ◽  
Rice Soils ◽  
Flooded Rice
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