Long-term monitoring of microbial biomass, N mineralisation and enzyme activities of a Chernozem under different tillage management

1999 ◽  
Vol 28 (4) ◽  
pp. 343-351 ◽  
Author(s):  
E. Kandeler ◽  
D. Tscherko ◽  
H. Spiegel
Keyword(s):  
Microbial Biomass ◽  
Enzyme Activities ◽  
Microbial Biomass N ◽  
N Mineralisation ◽  
Biomass N ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals Effect of soil sealing on the microbial biomass, N transformation and related enzyme activities at various depths of soils in urban area of Beijing, China

2012 ◽  
Vol 12 (4) ◽  
pp. 519-530 ◽  
Author(s):  
Dan Zhao ◽  
Feng Li ◽  
Rusong Wang ◽  
Qingrui Yang ◽  
Hongshan Ni
Keyword(s):  
Microbial Biomass ◽  
Urban Area ◽  
Enzyme Activities ◽  
Microbial Biomass N ◽  
Soil Sealing ◽  
N Transformation ◽  
Biomass N ◽  
Related Enzyme ◽  
Beijing China

Seasonal fluctuations in gross N mineralisation, ammonium consumption, and microbial biomass ina Western Australian soil under different land uses

1998 ◽  
Vol 49 (3) ◽  
pp. 523 ◽  
Author(s):  
D. V. Murphy ◽  
G. P. Sparling ◽  
I. R. P. Fillery
Keyword(s):  
Microbial Biomass ◽  
Empirical Relationship ◽  
Soil Layer ◽  
Subterranean Clover ◽  
Growing Season ◽  
Microbial Biomass N ◽  
N Mineralisation ◽  
Available N ◽  
Biomass N ◽  
Intact Soil Cores

A field experiment was conducted to study the seasonal variation in gross N mineralisation, NH4+ consumption (immobilisation and nitriflcation), potentially available N, and microbial biomass-N.Measurements were made during the wheat growing season in Western Australia under continuouswheat, during the wheat phase of a 1 year lupin : 1 year wheat rotation, during the wheat phaseof a 2 year pasture : 1 year wheat rotation, and under a subterranean clover pasture. The accuracyof gross N mineralisation and NH4+ consumption within intact soil cores was reduced by the largespatial variation in the size of the soil NH4+ pool. Calculated daily rates of gross N mineralisation inthe 0-5 cm soil layer ranged from 0·0 to 1·0 kg N/ha·day in the continuous wheat, 0·1 to 0·8 kgN/ha·day in the lupin{wheat rotation,- 0·1 to 1·3 kg N/ha·day in the pasture-wheat rotation, and-0·1 to 2·5 kg N/ha·day in the pasture treatment. Gross N mineralisation in the 5-10 cm soil layerunder wheat followed the same range observed in the 0-5 cm layer; in continuous pasture, lower rates were measured in the 5-10 cm layer compared with the 0-5 cm layer. The range in daily rates of NH4+ consumption in a given treatment was similar to the range in daily rates of gross N mineralisation,precluding accumulation of NH4+ in soil when considered over a season. Gross N mineralised in the0-10 cm soil layer was equivalent to 10-19% of the total soil N in this layer. Net N mineralised,determined from the difierence between gross N mineralisation and gross immobilisation, was estimatedto be about half of the gross N mineralised during the wheat growing season. Plant uptake wasestimated to be 13-37% of the total gross N mineralised (0-10 cm) during the field season and wasgreater in the wheat after legume compared with continuous wheat. Potentially available N, measured by anaerobic incubation, declined by about one-third during the season. At the beginning of the season, microbial biomass-N in the 0-5 cm soil layer contained 61 kg N/ha in continuous wheat, 68 kgN/ha in the lupin-wheat rotation, 73 kg N/ha in the pasture-wheat rotation, and 99 kg N/ha underpasture. Only half of these quantities of microbial biomass were detected by the end of the season. Microbial biomass-N was concentrated in the surface soil layer with <25 kg N/ha in the 5-10 cmsoil layer under each land use. A reasonable estimate of gross N mineralisation was obtained in the continuous wheat and legume-wheat rotations by using a simple empirical relationship based on thesize and activity of the microbial biomass, and functions to describe the efiect of temperature andwater on microbial activity. However, the pattern of gross N mineralisation in the pasture treatment could not be explained using this approach.

Long-Term Monitoring of Temperature Differences in a Steel Truss Bridge with Two-Layer Decks Compared with Bridge Codes: Case Study

2021 ◽  
Vol 26 (3) ◽  
pp. 05020013
Author(s):  
Gaoxin Wang ◽  
Xin Zhou ◽  
Youliang Ding ◽  
Xingwang Liu
Keyword(s):  
Steel Truss Bridge ◽  
Steel Truss ◽  
Long Term Monitoring ◽  
Truss Bridge ◽  
Term Monitoring

Future Needs for Long-Term Monitoring Design

2003 ◽  
Author(s):  
Barbara S. Minsker ◽  
Charles Davis ◽  
David Dougherty ◽  
Gus Williams
Keyword(s):  
Monitoring Design ◽  
Future Needs ◽  
Long Term Monitoring ◽  
Term Monitoring

Investigations on potential methods for the long-term monitoring of the state of fuel elements in dry storage casks

Kerntechnik ◽  
2018 ◽  
Vol 83 (6) ◽  
pp. 513-522 ◽  
Author(s):  
U. Hampel ◽  
A. Kratzsch ◽  
R. Rachamin ◽  
M. Wagner ◽  
S. Schmidt ◽  
...  
Keyword(s):  
The State ◽  
Dry Storage ◽  
Long Term Monitoring ◽  
Potential Methods ◽  
Fuel Elements ◽  
Term Monitoring
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