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ARS Home » Plains Area » Mandan, North Dakota » Northern Great Plains Research Laboratory » Research » Publications at this Location » Publication #316313
Title: Soil organic carbon beneath croplands and re-established grasslands in the North Dakota prairie pothole region

Author
item PHILLIPS, REBECCA - Landcare Research
item Eken, Mikki
item West, Mark

Submitted to: Environmental Management
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/19/2015
Publication Date: 3/27/2015
Publication URL: http://handle.nal.usda.gov/10113/61257
Citation: Phillips, R.L., Eken, M.R., West, M.S. 2015. Soil organic carbon beneath croplands and re-established grasslands in the North Dakota prairie pothole region. Environmental Management. doi: 10.1007/s00267-015-0459-3.

Interpretive Summary: This study compared grasslands managed under the conservation reserve program (CRP) in the Prairie Pothole Region (PPR) with neighboring annual croplands to test the effect of land use on soil organic carbon (SOC), root carbon (C), and bulk density at soil depths of 0–10, 10–20, 20–30, 30–40, 40–70, and 70–100 cm. The study revealed that compared to croplands, re-established grasslands sampled in the North Dakota PPR were 3–13% lower in bulk density and 9–16% higher in SOC from 0 to 20 cm, while root C was 2–6 times greater from 0 to 70 cm.

Technical Abstract: Grassland ecosystems established under the conservation reserve program (CRP) in the Prairie Pothole Region (PPR) currently provide soil conservation and wildlife habitat services. We aimed to determine if these lands also sequester soil organic carbon (SOC), as compared with neighboring croplands across multiple farms in the North Dakota PPR. We sampled soil from small plots at 17 private farms in the central North Dakota PPR, where long-term (=15 years) grasslands managed under the CRP were paired with neighboring annual croplands. Cores were collected to 100 cm and split into 0–10, 10–20, 20–30, 30–40, 40–70, and 70–100 cm soil depth layers. We hypothesized the effect of land use on soil organic carbon (SOC), root carbon (C), and bulk density would be greatest near the surface. For 0–10 and 10–20 cm layers, grasslands managed under the CRP were lower in bulk density and higher in SOC. From 0 to 70 cm, grasslands managed under the CRP were higher in root C. Average (±standard error) SOC for re-established grasslands and croplands was 25.39 (0.91) and 21.90 (1.02), respectively, for the 0–10 cm soil layer and 19.88 (0.86) and 18.31 (0.82), respectively, for the 10–20 soil layer. Compared to croplands, re-established grasslands sampled in the North Dakota PPR were 3–13% lower in bulk density and 9–16% higher in SOC from 0 to 20 cm, while root C was 2–6 times greater from 0 to 70 cm.