Soil Science Society of America Journal · 2001
Organic Matter Dynamics and Carbon Sequestration Rates for a Tillage Chronosequence in a Brazilian Oxisol
de M Sá, J. C., Cerri, C. C., Dick, W. A., Lal, R., Filho, S. P. V., Piccolo, M. C., Feigl, B. E.
Export
Organic Matter Dynamics and Carbon Sequestration Rates for a…
Abstract
Amounts and rates of C sequestration under no‐tillage are not known for a major ecological region of south Brazil. These were assessed in a Brazilian Oxisol under a plow and no‐tillage chronosequence located in Paraná State. The chronosequence consisted of six treatments: (i) native field (NF); (ii) 1‐yr plow conversion of native field to cropland (PNF‐1); (iii) no‐tillage for 10 yr (NT‐10); (iv) no‐tillage for 20 yr (NT‐20); (v) no‐tillage for 22 yr (NT‐22); and (vi) conventional tillage for 22 yr (CT‐22). Soil samples were collected from five depths. No‐tillage, compared with the NF treatment, caused a significant increase in soil organic C (SOC) storage. More than 60% of this increase occurred in the 0‐ to 10‐cm soil layer. There was a decrease in the amount of SOC in the CT‐22 compared with the NF soil treatment and 97% of this loss also occurred in the 0‐ to 10‐cm layer. There was a close relationship between the SOC content and the amount of crop residues input ( R 2 = 0.74, P ≤ 0.05). There were increased SOC concentrations in the finer particle‐size fractions (<20 μm) of no‐tillage surface soil compared with the NF or CT‐22 soils. However, the percentage of SOC derived from crop residues in no‐tillage treatments, as assessed by 13C natural abundance (δ), was generally greater in the coarse (>20 μm) than in the finer (<20 μm) particle‐size fractions. The C sequestration rate for no‐tillage was 80.6 g C m −2 yr −1 for the 0‐ to 20‐cm depth and 99.4 g C m −2 yr −1 for the 0‐ to 40‐cm depth. The no‐tillage C sequestration potential for South Brazil was estimated as 9.37 Tg C yr −1
Show all
Amounts and rates of C sequestration under no‐tillage are not known for a major ecological region of south Brazil. These were assessed in a Brazilian Oxisol under a plow and no‐tillage chronosequence located in Paraná State. The chronosequence consisted of six treatments: (i) native field (NF); (ii) 1‐yr plow conversion of native field to cropland (PNF‐1); (iii) no‐tillage for 10 yr (NT‐10); (iv) no‐tillage for 20 yr (NT‐20); (v) no‐tillage for 22 yr (NT‐22); and (vi) conventional tillage for 22 yr (CT‐22). Soil samples were collected from five depths. No‐tillage, compared with the NF treatment, caused a significant increase in soil organic C (SOC) storage. More than 60% of this increase occurred in the 0‐ to 10‐cm soil layer. There was a decrease in the amount of SOC in the CT‐22 compared with the NF soil treatment and 97% of this loss also occurred in the 0‐ to 10‐cm layer. There was a close relationship between the SOC content and the amount of crop residues input ( R 2 = 0.74, P ≤ 0.05). There were increased SOC concentrations in the finer particle‐size fractions (<20 μm) of no‐tillage surface soil compared with the NF or CT‐22 soils. However, the percentage of SOC derived from crop residues in no‐tillage treatments, as assessed by 13C natural abundance (δ), was generally greater in the coarse (>20 μm) than in the finer (<20 μm) particle‐size fractions. The C sequestration rate for no‐tillage was 80.6 g C m −2 yr −1 for the 0‐ to 20‐cm depth and 99.4 g C m −2 yr −1 for the 0‐ to 40‐cm depth. The no‐tillage C sequestration potential for South Brazil was estimated as 9.37 Tg C yr −1
Amounts and rates of C sequestration under no‐tillage are not known for a major ecological region of south Brazil. These were assessed in a Brazilian Oxisol under a plow and no‐tillage chronosequence located in Paraná State. The chronosequence consisted of six treatments: (i) native field (NF); (ii) 1‐yr plow conversion of native field to cropland (PNF‐1); (iii) no‐tillage for 10 yr (NT‐10); (iv) no‐tillage for 20 yr (NT‐20); (v) no‐tillage for 22 yr (NT‐22); and (vi) conventional tillage for 22 yr (CT‐22). Soil samples were collected from five depths. No‐tillage, compared with the NF treatment, caused a significant increase in soil organic C (SOC) storage. More than 60% of this increase occurred in the 0‐ to 10‐cm soil layer. There was a decrease in the amount of SOC in the CT‐22 compared with the NF soil treatment and 97% of this loss also occurred in the 0‐ to 10‐cm layer. There was a close relationship between the SOC content and the amount of crop residues input ( R 2 = 0.74, P ≤ 0.05). There were increased SOC concentrations in the finer particle‐size fractions (<20 μm) of no‐tillage surface soil compared with the NF or CT‐22 soils. However, the percentage of SOC derived from crop residues in no‐tillage treatments, as assessed by 13C natural abundance (δ), was generally greater in the coarse (>20 μm) than in the finer (<20 μm) particle‐size fractions. The C sequestration rate for no‐tillage was 80.6 g C m −2 yr −1 for the 0‐ to 20‐cm depth and 99.4 g C m −2 yr −1 for the 0‐ to 40‐cm depth. The no‐tillage C sequestration potential for South Brazil was estimated as 9.37 Tg C yr −1
Similar papers
No-tillage and fertilization effectively improved soil carbon and nitrogen in a subtropical Ferralsol
Brevilieri et al. · 2024 · Soil and Tillage Research
8 shared concepts
14 findings1 site
Possibilities of carbon and nitrogen sequestration under conventional tillage and no-till cover crop farming (Mekong valley, Laos)
de Rouw et al. · 2010 · Agriculture, Ecosystems & Environment
7 shared concepts
15 findings1 site
Cropping system partially offsets tillage-related degradation of soil organic carbon and aggregate properties in a 30-yr rainfed agroecosystem
Jin et al. · 2021 · Soil and Tillage Research
6 shared concepts