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Carbon and Nitrogen Mineralization in Relation to Soil Particle-Size Fractions after 32 Years of Chemical and Manure Application in a Continuous Maize Cropping System.

Cai A, Xu H, Shao X, Zhu P, Zhang W, Xu M, Murphy DV - PLoS ONE (2016)

Bottom Line: In the <53 μm fraction, the M60NPK treatment significantly increased the amount of C and N mineralized (7.0 and 10.1 times, respectively) compared to the M0CK treatment.Long-term manure application, especially when combined with chemical fertilizers, resulted in increased soil microbial biomass C and N, and a decreased microbial metabolic quotient.Consequently, long-term manure fertilization was beneficial to both soil C and N turnover and microbial activity, and had significant effect on the microbial metabolic quotient.

View Article: PubMed Central - PubMed

Affiliation: National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.

ABSTRACT
Long-term manure application is recognized as an efficient management practice to enhance soil organic carbon (SOC) accumulation and nitrogen (N) mineralization capacity. A field study was established in 1979 to understand the impact of long-term manure and/or chemical fertilizer application on soil fertility in a continuous maize cropping system. Soil samples were collected from field plots in 2012 from 9 fertilization treatments (M0CK, M0N, M0NPK, M30CK, M30N, M30NPK, M60CK, M60N, and M60NPK) where M0, M30, and M60 refer to manure applied at rates of 0, 30, and 60 t ha(-1) yr(-1), respectively; CK indicates no fertilizer; N and NPK refer to chemical fertilizer in the forms of either N or N plus phosphorus (P) and potassium (K). Soils were separated into three particle-size fractions (2000-250, 250-53, and <53 μm) by dry- and wet-sieving. A laboratory incubation study of these separated particle-size fractions was used to evaluate the effect of long-term manure, in combination with/without chemical fertilization application, on the accumulation and mineralization of SOC and total N in each fraction. Results showed that long-term manure application significantly increased SOC and total N content and enhanced C and N mineralization in the three particle-size fractions. The content of SOC and total N followed the order 2000-250 μm > 250-53 μm > 53 μm fraction, whereas the amount of C and N mineralization followed the reverse order. In the <53 μm fraction, the M60NPK treatment significantly increased the amount of C and N mineralized (7.0 and 10.1 times, respectively) compared to the M0CK treatment. Long-term manure application, especially when combined with chemical fertilizers, resulted in increased soil microbial biomass C and N, and a decreased microbial metabolic quotient. Consequently, long-term manure fertilization was beneficial to both soil C and N turnover and microbial activity, and had significant effect on the microbial metabolic quotient.

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Relationship between soil organic carbon (SOC) storage vs potential carbon (C) mineralization, and total N storage, potential nitrogen (N) mineralization in 2000–250 μm, 250–53 μm, <53 μm fraction and bulk soil after 32 years of manure fertilization.
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pone.0152521.g004: Relationship between soil organic carbon (SOC) storage vs potential carbon (C) mineralization, and total N storage, potential nitrogen (N) mineralization in 2000–250 μm, 250–53 μm, <53 μm fraction and bulk soil after 32 years of manure fertilization.

Mentions: The amount of SOC and N mineralized differed among particle-size fractions and under different fertilizer application treatments (Table 2). For the CK treatments, there were no differences among the three soil fractions under manure application. However, there was more C mineralized from the <53 μm fraction with manure applied at 60 t ha-1 yr-1 (M60), compared with no manure (M0, Table 2). As a general trend N mineralization increased with manure application, showing more N mineralized from <53 μm fraction under the M30NPK and M60NPK treatments. There was no relationship between the storage of SOC or total N and the C or N mineralization from the bulk soil (Fig 4). Interestingly, N mineralization was strongly related to total N storage in the 250–53 μm and <53 μm fractions and C mineralization was significantly positive related to SOC storage in the 2000–250 μm and <53 μm fractions.


Carbon and Nitrogen Mineralization in Relation to Soil Particle-Size Fractions after 32 Years of Chemical and Manure Application in a Continuous Maize Cropping System.

Cai A, Xu H, Shao X, Zhu P, Zhang W, Xu M, Murphy DV - PLoS ONE (2016)

Relationship between soil organic carbon (SOC) storage vs potential carbon (C) mineralization, and total N storage, potential nitrogen (N) mineralization in 2000–250 μm, 250–53 μm, <53 μm fraction and bulk soil after 32 years of manure fertilization.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4816382&req=5

pone.0152521.g004: Relationship between soil organic carbon (SOC) storage vs potential carbon (C) mineralization, and total N storage, potential nitrogen (N) mineralization in 2000–250 μm, 250–53 μm, <53 μm fraction and bulk soil after 32 years of manure fertilization.
Mentions: The amount of SOC and N mineralized differed among particle-size fractions and under different fertilizer application treatments (Table 2). For the CK treatments, there were no differences among the three soil fractions under manure application. However, there was more C mineralized from the <53 μm fraction with manure applied at 60 t ha-1 yr-1 (M60), compared with no manure (M0, Table 2). As a general trend N mineralization increased with manure application, showing more N mineralized from <53 μm fraction under the M30NPK and M60NPK treatments. There was no relationship between the storage of SOC or total N and the C or N mineralization from the bulk soil (Fig 4). Interestingly, N mineralization was strongly related to total N storage in the 250–53 μm and <53 μm fractions and C mineralization was significantly positive related to SOC storage in the 2000–250 μm and <53 μm fractions.

Bottom Line: In the <53 μm fraction, the M60NPK treatment significantly increased the amount of C and N mineralized (7.0 and 10.1 times, respectively) compared to the M0CK treatment.Long-term manure application, especially when combined with chemical fertilizers, resulted in increased soil microbial biomass C and N, and a decreased microbial metabolic quotient.Consequently, long-term manure fertilization was beneficial to both soil C and N turnover and microbial activity, and had significant effect on the microbial metabolic quotient.

View Article: PubMed Central - PubMed

Affiliation: National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.

ABSTRACT
Long-term manure application is recognized as an efficient management practice to enhance soil organic carbon (SOC) accumulation and nitrogen (N) mineralization capacity. A field study was established in 1979 to understand the impact of long-term manure and/or chemical fertilizer application on soil fertility in a continuous maize cropping system. Soil samples were collected from field plots in 2012 from 9 fertilization treatments (M0CK, M0N, M0NPK, M30CK, M30N, M30NPK, M60CK, M60N, and M60NPK) where M0, M30, and M60 refer to manure applied at rates of 0, 30, and 60 t ha(-1) yr(-1), respectively; CK indicates no fertilizer; N and NPK refer to chemical fertilizer in the forms of either N or N plus phosphorus (P) and potassium (K). Soils were separated into three particle-size fractions (2000-250, 250-53, and <53 μm) by dry- and wet-sieving. A laboratory incubation study of these separated particle-size fractions was used to evaluate the effect of long-term manure, in combination with/without chemical fertilization application, on the accumulation and mineralization of SOC and total N in each fraction. Results showed that long-term manure application significantly increased SOC and total N content and enhanced C and N mineralization in the three particle-size fractions. The content of SOC and total N followed the order 2000-250 μm > 250-53 μm > 53 μm fraction, whereas the amount of C and N mineralization followed the reverse order. In the <53 μm fraction, the M60NPK treatment significantly increased the amount of C and N mineralized (7.0 and 10.1 times, respectively) compared to the M0CK treatment. Long-term manure application, especially when combined with chemical fertilizers, resulted in increased soil microbial biomass C and N, and a decreased microbial metabolic quotient. Consequently, long-term manure fertilization was beneficial to both soil C and N turnover and microbial activity, and had significant effect on the microbial metabolic quotient.

Show MeSH
Related in: MedlinePlus