Transport of labile carbon in runoff as affected by land use and
However, despite the control of low-intensity storm on sediment C concentration and quality ... impact of water erosion will be the release of labile C associated with the ... â1 per year during the corn year) and herbicides at recommended rates.
Transport of labile carbon in runoff as affected by land use and rainfall characteristics P.-A. Jacinthe a,∗ , R. Lal a , L.B. Owens b , D.L. Hothem b a
School of Natural Resources, The Ohio State University, 2021 Coffey Road, 210 Kottman Hall, Columbus, OH 43210, USA b USDA-ARS, North Appalachian Experimental Watershed, Coshocton, OH 43812, USA Received 9 April 2003; received in revised form 27 October 2003; accepted 25 November 2003
Abstract The mobilization of organic carbon (C) by water erosion could impact the terrestrial C budget, but the magnitude and direction of that impact remain uncertain due to a lack of data regarding the fates and quality of eroded C. A study was conducted to monitor total organic C and mineralizable C (MinC) in eroded materials from watersheds under no till (NT), chisel till (CT), disk till low input (DT-LI), pasture and forest. The DT-LI treatment relies on manure application and legume cover crops to partly supply the N needed when corn is grown, and on cultivation to reduce the use of herbicides. Each watershed was instrumented with a flume and a Coshocton wheel sampler for runoff measurement. Carbon dioxide (CO2 ) evolved during incubation (115 days) of runoff samples was fitted to a first-order decomposition model to derive MinC. Annual soil (6.2 Mg ha−1 ) and organic C (113.8 kg C ha−1 ) losses were twice as much in the DT-LI than in the other watersheds (55 years >62 years
6.6 6.4 6.9 6.1 5.4
1.5 1.3 1.5 1.5 1.0
(0.1) (0.1) (0.2) (0.1) (0.2)
1.8 1.3 1.6 1.8 2.9
18.3 17.6 18.4 28.6 36.0
(0.1) (0.0) (0.1) (0.1) (0.7)
0.32 0.34 0.45 0.50 0.79
(0.00) (0.01) (0.00) (0.01) (0.02)
1.9 1.7 1.6 2.9 1.2
35.4 38.5 17.9 41.6 17.9
Soil depth 118 123 127 129 172
(10–20 cm) NT CT-C DT-LI Pasture Forest
CSR, 17 years CSR, 17 years CSW/Cl, 11 years >55 years >62 years
6.5 6.6 7 7.5 5.2
1.5 1.5 1.6 1.4 1.3
(0.1) (0.3) (0.1) (0.2) (0.3)
1.2 1.1 0.6 2 1.1
12.0 13.4 8.6 14.9 15.8
(0.1) (0.1) (0.1) (0.1) (0.2)
0.11 0.19 0.12 0.16 0.13
(0.01) (0.01) (0.01) (0.01) (0.00)
2.9 2.2 3.4 5.6 2.8
102.9 109.1 67.3 130 108.8
a
NT: no till; CT: chisel till; DT: disk till; LI: low chemical input. C: corn; S: soybean; R: rye; W: wheat; Cl: clover. c MWD: mean weight diameter of soil aggregates. d MinC: carbon mineralized after 115 days of incubation of soil (
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