Long-term effects of soil management regimes on carbon contents and respiration rates of aggregate size fractions

2016 ◽  
Vol 32 (4) ◽  
pp. 525-534 ◽  
Author(s):  
S. Zhang ◽  
J. Li ◽  
X. Yang ◽  
B. Sun
Keyword(s):  
Aggregate Size ◽  
Soil Management ◽  
Long Term Effects ◽  
Size Fractions ◽  
Respiration Rates ◽  
Management Regimes

Simulated long-term effects of different soil management regimes on the water balance in the Loess Plateau, China

2007 ◽  
Vol 100 (2-3) ◽  
pp. 311-319 ◽  
Author(s):  
Shulan Zhang ◽  
Elisabeth Simelton ◽  
Lars Lövdahl ◽  
Harald Grip ◽  
Deliang Chen
Keyword(s):  
Water Balance ◽  
Loess Plateau ◽  
Soil Management ◽  
Long Term Effects ◽  
The Loess Plateau ◽  
Management Regimes

Cultivation effects on dispersible clay of soil aggregates

1995 ◽  
Vol 75 (1) ◽  
pp. 101-107 ◽  
Author(s):  
L. G. Fuller ◽  
Tee Boon Goh ◽  
D. W. Oscarson
Keyword(s):  
Soil Aggregates ◽  
Aggregate Size ◽  
Exchange Capacity ◽  
Exchangeable Cations ◽  
Organic C ◽  
Size Fractions ◽  
Clay Dispersion ◽  
Native Prairie ◽  
Exchangeable Ca

The objective of this study was to examine the effect of long-term cultivation on clay dispersibility of four aggregate size fractions (2.0–9.5 mm, 0.85–2.0 mm, 0.25–0.85 mm, and < 0.25 mm) obtained from a Chernozemic soil by comparing two cultivated sites with an adjacent native prairie site. Aggregate size fractions (ASF) were subjected to increasing levels of ultrasonic energy and the amount of clay dispersed at each energy level was determined. Organic carbon, hexose carbon, soluble hexose C, total clay, cation exchange capacity (CEC), and exchangeable cations were measured for each ASF. Clay contained within prairie aggregates was held much more strongly within the aggregate and therefore showed greater stability towards dispersion by ultrasonic vibration. More energy was required to disperse one-half of the ASF clay under prairie than under cultivated soils (228–425, and 95–229 kJ L−1 for prairie and cultivated macroaggregates, respectively; 370–433, and 249–334 kJ L−1 for prairie and cultivated microaggregates, respectively). Clay dispersibility was significantly correlated with organic C, hexose C, soluble hexose C, non-hexose C, CEC, and exchangeable Ca and Mg but was not correlated with total ASF clay. Long-term cultivation of this soil resulted in a decrease in the energy required to disperse an equivalent proportion of clay from aggregates relative to that of the grassland soil. Thus, cultivation of these soils has resulted in aggregates which are more susceptible to clay dispersion and therefore prone to water erosion and surface crusting. Key words: Clay dispersion, aggregation, carbohydrate

Effet à long terme d'apports d'engrais minéraux et de fumier sur les teneurs en C et en N des fractions densimétriques et des agrégats du loam limoneux Le Bras

1997 ◽  
Vol 77 (3) ◽  
pp. 351-358 ◽  
Author(s):  
A. N'Dayegamiye ◽  
M. Goulet ◽  
M. R. Laverdière
Keyword(s):  
N Mineralization ◽  
Size Fraction ◽  
Aggregate Size ◽  
Mineral Fertilizer ◽  
Microbial Biomass N ◽  
Organic Residues ◽  
Soil C ◽  
Size Fractions ◽  
C And N

Long-term mineral fertilizer applications could reduce organic matter (OM) levels in soil if coupled with crop rotations with low organic residues inputs. The main objective of this study was to evaluate the C and N contents in whole soil, in densimetric OM fractions and in different aggregate size fractions of a Le Bras silt loam (Humic Gleysol). The treatments were arranged in a split-plot design, with dairy cattle manure applied at 0 and 20 Mgha−1 as the main factor. The subplots consisted of six fertilizer treatments (NK, PK, NP, NPK, NPKMg and the unfertilized check). The four year rotation included silage corn, (Zea mays L.) silage corn, wheat (Triticum Aestivum L.) and barley (Hordeum vulgaris L.). Contrary to mineral fertilizer, long-term manure applications significantly increased the C content in whole soil and also in the light and heavy fractions of OM (Fl and Fd). Mineral fertilizer significantly increased the C and N contents only in Fl. Moreover, manure application also increased the weight of the 5–8 mm aggregate size fraction and the C and N content in the 5–8 mm, 2–5 mm, 1–2 mm and 0,25–1 mm aggregate size fractions, compared to mineral fertilizer alone. In manured plots, soil C biomass, microbial respiration (CO2) and N mineralization (NO3) levels increased by 30% compared with mineral fertilizer treatments. Results of this study demonstrate the important effect of manure applications on C and N enrichment in soil and also on soil macroaggregation and biological activity. To maintain optimal C and N levels in soil and to favour soil macroaggregation, long-term mineral fertilizer application should be combined with crops in rotations which ensure high organic residues returns to soils. Key words: Macroaggregation, microbial biomass, N mineralization, long-term, light fraction, heavy fraction

scholarly journals Microbiome Aggregated Traits and Assembly Are More Sensitive to Soil Management than Diversity

mSystems ◽  
2021 ◽  
Author(s):  
Andrew L. Neal ◽  
David Hughes ◽  
Ian M. Clark ◽  
Janet K. Jansson ◽  
Penny R. Hirsch
Keyword(s):  
Land Management ◽  
Soil Management ◽  
Soil Microbiome ◽  
Environmental Services ◽  
Clean Water ◽  
Long Term Effects ◽  
Microbiome Diversity ◽  
Management Approaches ◽  
And Function

Changes in soil microbiome diversity and function brought about by land management are predicted to influence a range of environmental services provided by soil, including provision of food and clean water. However, opportunities to compare the long-term effects of combinations of stresses imposed by different management approaches are limited.

Effect of soil aggregate size and long-term contrasting tillage, stubble and nitrogen management regimes on CO2 fluxes from a Vertisol

Geoderma ◽  
2019 ◽  
Vol 337 ◽  
pp. 1086-1096 ◽  
Author(s):  
S.H. Reeves ◽  
J. Somasundaram ◽  
W.J. Wang ◽  
M.A. Heenan ◽  
D. Finn ◽  
...  
Keyword(s):  
Aggregate Size ◽  
Soil Aggregate ◽  
Nitrogen Management ◽  
Co2 Fluxes ◽  
Management Regimes

Carbon contents and respiration rates of aggregate size fractions under no-till and conventional tillage

2010 ◽  
Vol 109 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Romina Fernández ◽  
Alberto Quiroga ◽  
Carlos Zorati ◽  
Elke Noellemeyer
Keyword(s):  
Aggregate Size ◽  
Conventional Tillage ◽  
Size Fractions ◽  
Respiration Rates ◽  
No Till

scholarly journals Soil aggregation and aggregate associated organic carbon and total nitrogen under long-term contrasting soil management regimes in loess soil

2015 ◽  
Vol 14 (12) ◽  
pp. 2405-2416 ◽  
Author(s):  
Jun-yu XIE ◽  
Ming-gang XU ◽  
Qiangjiu Ciren ◽  
Yang YANG ◽  
Shu-lan ZHANG ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Total Nitrogen ◽  
Soil Management ◽  
Loess Soil ◽  
Soil Aggregation ◽  
Management Regimes
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