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Title: Legacy effects of land use on soil nitrous oxide emissions in annual crop and perennial grassland ecosystems

Land use conversions into and out of agriculture may influence soil–atmosphere greenhouse gas fluxes for many years. We tested the legacy effects of land use on cumulative soil nitrous oxide (N 2O) fluxes for 5 yr following conversion of 22-yr-old Conservation Reserve Program (CRP) grasslands and conventionally tilled agricultural fields (AGR) to continuous no-till corn, switchgrass, and restored prairie. An unconverted CRP field served as a reference. We assessed the labile soil C pool of the upper 10 cm in 2009 (the conversion year) and in 2014 using short-term soil incubations. We also measured in situ soil N 2O fluxes biweekly from 2009 through 2014 using static chambers except when soils were frozen. The labile C pool was approximately twofold higher in soils previously in CRP than in those formerly in tilled cropland. Five-year cumulative soil N 2O emissions were approximately threefold higher in the corn system on former CRP than on former cropland despite similar fertilization rates (~184 kg N·ha -1·yr -1). The lower cumulative emissions from corn on former cropland were similar to emissions from switchgrass that was fertilized less (~57 kg N·ha -1·yr -1), regardless of former land use, and lowest emissions were observed from the unfertilizedmore » restored prairie and reference systems. Lastly, findings support the hypothesis that soil labile carbon levels modulate the response of soil N 2O emissions to nitrogen inputs, with soils higher in labile carbon but otherwise similar, in this case reflecting land use history, responding more strongly to added nitrogen.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Michigan State Univ., East Lansing, MI (United States). Center for Global Change and Earth Observations; Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center; Michigan State Univ., East Lansing, MI (United States). W.K. Kellogg Biological Station
  2. Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center; Michigan State Univ., East Lansing, MI (United States). W.K. Kellogg Biological Station
  3. Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center; Michigan State Univ., East Lansing, MI (United States). W.K. Kellogg Biological Station; Michigan State Univ., East Lansing, MI (United States). Dept. of Integrative Biology
  4. Michigan State Univ., East Lansing, MI (United States). Center for Global Change and Earth Observations; Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center; Michigan State Univ., East Lansing, MI (United States). Dept. of Geography, Environment, and Spatial Sciences
  5. Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center; Michigan State Univ., East Lansing, MI (United States). W.K. Kellogg Biological Station; Michigan State Univ., East Lansing, MI (United States). Dept. of Plant, Soil, and Microbial Sciences
Publication Date:
Grant/Contract Number:
SC0018409; FC02-07ER64494
Type:
Published Article
Journal Name:
Ecological Applications
Additional Journal Information:
Journal Volume: 28; Journal Issue: 5; Journal ID: ISSN 1051-0761
Publisher:
Ecological Society of America
Research Org:
Michigan State Univ., East Lansing, MI (United States). Great Lakes Bioenergy Research Center
Sponsoring Org:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Climate change; Conservation Reserve Program; corn; emission factor; grassland; greenhouse gas; labile soil carbon; land use change; no till; restored prairie; smooth brome grass; switchgrass
OSTI Identifier:
1439918
Alternate Identifier(s):
OSTI ID: 1439919; OSTI ID: 1459409