Land management effects on wet aggregate stability and carbon content
Journal Article
·
· Soil Science Society of America Journal
- USDA-ARS, Akron, CO (United States); Antares Group Inc.
- USDA-ARS, Lincoln, NE (United States)
- USDA-ARS, Morris, MN (United States)
- North Central Agricultural Research Lab., Brookings, SD (United States)
- USDA-ARS, Ames, IA (United States)
- USDA‐ARS, Sidney, MT (United States)
Land management affects soil structure and many other soil properties and processes. Our objectives were to evaluate soil organic C (SOC), aggregate size distribution, aggregate-associated C, and soil structure as affected by long-term land management and slope. A chronosequence of 38 on-farm sites with low to high (5–18%) slopes was selected to evaluate 5–40 yr of management. The sites were classified as business as usual (BAU) cropland (BAU-Crop), BAU pasture (BAU-Past), newly established conservation reserve program (CRP) areas (CRP-New), and established CRP (CRP-Old). Soil samples were collected from the 0-to-5- and 5-to-15-cm depth increments and processed for soil property measurements including fractionation by wet sieving into five aggregate size classes (>2,000, 1,000–2,000, 500–1,000, 250–500, and 53–250 μm). Within the surface 5 cm, mean weight diameter (MWD) and geometric mean diameter (GMD) were used to characterize soil structural stability. The BAU-Past and CRP-Old sites had 79% more macroaggregates (>2,000, 1,000–2,000, and 500–1,000 μm), 123% higher MWD, 38% higher GMD, and 47% higher SOC than BAU-Crop or CRP-New sites. The 5-to-15-cm depth increment showed a similar but lower magnitude response. Aggregate-associated C was quantified using a constant soil mass that reflected aggregate size distribution to prevent overestimating C content. Lower-slope locations had more SOC, more macroaggregates, more C associated with macroaggregates, and higher GMD and MWD compared with high-slope locations across all management classifications and soil depths. The results support our hypothesis that the high-slop soils may benefits from specific management decisions than the lower-sloping soils as a function of landscape property. We recommend reestablishing grassland on sloping land that is susceptible to excessive soil erosion, although those practices will likely take a long time to restore soil structural stability and SOC content to precultivation levels.
- Research Organization:
- USDA-ARS, Ames, IA (United States); USDA-ARS, Lincoln, NE (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
- Grant/Contract Number:
- EE0007088
- OSTI ID:
- 1836097
- Report Number(s):
- DOE-ANTARES--07088-27
- Journal Information:
- Soil Science Society of America Journal, Journal Name: Soil Science Society of America Journal Journal Issue: 6 Vol. 85; ISSN 0361-5995
- Publisher:
- Alliance of Crop, Soil, and Environmental Science SocietiesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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