Details
| Original language | English |
|---|---|
| Pages (from-to) | 253-259 |
| Number of pages | 7 |
| Journal | Soil Biology and Biochemistry |
| Volume | 42 |
| Issue number | 2 |
| Publication status | Published - Feb 2010 |
Abstract
With increasing food demand worldwide, agriculture in semiarid and arid regions becomes increasingly important, though knowledge about organic matter (OM) conserving management systems is scarce. This study aimed at examining organic C (OC) and nitrogen (N) concentrations in various soil OM pools affected by 26-years application of chemical fertilizer and farmyard manure at an arid site of Gansu Province, China. Macro OM (>0.05 mm) was extracted by wet sieving and then separated into light macro OM (<1.8 g cm-3) and heavy macro OM (>1.8 g cm-3) sub-fractions; bulk soil was differentiated into free particulate OM (FPOM, <1.6 g cm-3), occluded particulate OM (OPOM, 1.6-1.8 g cm-3) and mineral-associated OM (>1.8 g cm-3). OC and N concentrations of heavy macro OM and FPOM were slightly affected by long-term N fertilization alone and its combination with P and K, but their magnitudes of change had not significantly contributed to total soil OC and N concentrations. Farmyard manure increased light macro OC and N by 58 and 70%, heavy macro OC and N by 86 and 117%, free particulate OC and N by 29 and 55%, occluded particulate OC and N by 29 and 55%, and mineral-associated OC and N by 44 and 48%, respectively, compared to nil-manure. Mineral fertilization improved soil OM quality by decreasing C/N ratio in the light macro OM and FPOM fractions where farmyard manure was absent. Organic manure led to a decline of the C/N ratio in all physically-separated OM fractions possibly due to the increased input of processed organic materials. We found about two thirds of macro OM was actually located within 2-0.05 mm organo-mineral associations or/and aggregates. In conclusion, this study stresses the vital importance to apply organic manure to the wheat-corn production system characterized by straw removal and conventional tillage in the region.
Keywords
- Arid region, Coarse mineral-associated fraction, Combined particle size and density soil fractionation, Heavy macro organic fraction, Light macro organic fraction, Long-term fertilization experiment
ASJC Scopus subject areas
- Immunology and Microbiology(all)
- Microbiology
- Agricultural and Biological Sciences(all)
- Soil Science
Sustainable Development Goals
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In: Soil Biology and Biochemistry, Vol. 42, No. 2, 02.2010, p. 253-259.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Long-term fertilization and manuring effects on physically-separated soil organic matter pools under a wheat-wheat-maize cropping system in an arid region of China
AU - Hai, Long
AU - Li, Xiao Gang
AU - Li, Feng Min
AU - Suo, Dong Rang
AU - Guggenberger, Georg
N1 - Funding information: This work was financed by “973” program (2007CB106804) and innovation group project of China Ministry of Education.
PY - 2010/2
Y1 - 2010/2
N2 - With increasing food demand worldwide, agriculture in semiarid and arid regions becomes increasingly important, though knowledge about organic matter (OM) conserving management systems is scarce. This study aimed at examining organic C (OC) and nitrogen (N) concentrations in various soil OM pools affected by 26-years application of chemical fertilizer and farmyard manure at an arid site of Gansu Province, China. Macro OM (>0.05 mm) was extracted by wet sieving and then separated into light macro OM (<1.8 g cm-3) and heavy macro OM (>1.8 g cm-3) sub-fractions; bulk soil was differentiated into free particulate OM (FPOM, <1.6 g cm-3), occluded particulate OM (OPOM, 1.6-1.8 g cm-3) and mineral-associated OM (>1.8 g cm-3). OC and N concentrations of heavy macro OM and FPOM were slightly affected by long-term N fertilization alone and its combination with P and K, but their magnitudes of change had not significantly contributed to total soil OC and N concentrations. Farmyard manure increased light macro OC and N by 58 and 70%, heavy macro OC and N by 86 and 117%, free particulate OC and N by 29 and 55%, occluded particulate OC and N by 29 and 55%, and mineral-associated OC and N by 44 and 48%, respectively, compared to nil-manure. Mineral fertilization improved soil OM quality by decreasing C/N ratio in the light macro OM and FPOM fractions where farmyard manure was absent. Organic manure led to a decline of the C/N ratio in all physically-separated OM fractions possibly due to the increased input of processed organic materials. We found about two thirds of macro OM was actually located within 2-0.05 mm organo-mineral associations or/and aggregates. In conclusion, this study stresses the vital importance to apply organic manure to the wheat-corn production system characterized by straw removal and conventional tillage in the region.
AB - With increasing food demand worldwide, agriculture in semiarid and arid regions becomes increasingly important, though knowledge about organic matter (OM) conserving management systems is scarce. This study aimed at examining organic C (OC) and nitrogen (N) concentrations in various soil OM pools affected by 26-years application of chemical fertilizer and farmyard manure at an arid site of Gansu Province, China. Macro OM (>0.05 mm) was extracted by wet sieving and then separated into light macro OM (<1.8 g cm-3) and heavy macro OM (>1.8 g cm-3) sub-fractions; bulk soil was differentiated into free particulate OM (FPOM, <1.6 g cm-3), occluded particulate OM (OPOM, 1.6-1.8 g cm-3) and mineral-associated OM (>1.8 g cm-3). OC and N concentrations of heavy macro OM and FPOM were slightly affected by long-term N fertilization alone and its combination with P and K, but their magnitudes of change had not significantly contributed to total soil OC and N concentrations. Farmyard manure increased light macro OC and N by 58 and 70%, heavy macro OC and N by 86 and 117%, free particulate OC and N by 29 and 55%, occluded particulate OC and N by 29 and 55%, and mineral-associated OC and N by 44 and 48%, respectively, compared to nil-manure. Mineral fertilization improved soil OM quality by decreasing C/N ratio in the light macro OM and FPOM fractions where farmyard manure was absent. Organic manure led to a decline of the C/N ratio in all physically-separated OM fractions possibly due to the increased input of processed organic materials. We found about two thirds of macro OM was actually located within 2-0.05 mm organo-mineral associations or/and aggregates. In conclusion, this study stresses the vital importance to apply organic manure to the wheat-corn production system characterized by straw removal and conventional tillage in the region.
KW - Arid region
KW - Coarse mineral-associated fraction
KW - Combined particle size and density soil fractionation
KW - Heavy macro organic fraction
KW - Light macro organic fraction
KW - Long-term fertilization experiment
UR - http://www.scopus.com/inward/record.url?scp=71849112568&partnerID=8YFLogxK
U2 - 10.1016/j.soilbio.2009.10.023
DO - 10.1016/j.soilbio.2009.10.023
M3 - Article
AN - SCOPUS:71849112568
VL - 42
SP - 253
EP - 259
JO - Soil Biology and Biochemistry
JF - Soil Biology and Biochemistry
SN - 0038-0717
IS - 2
ER -