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Switchgrass ( Panicum virgatum L.) cultivars have similar impacts on soil carbon and nitrogen stocks and microbial function

Journal Article · · Global Change Biology. Bioenergy
DOI:https://doi.org/10.1111/gcbb.13125· OSTI ID:2283460
 [1];  [1];  [1];  [1]
  1. Great Lakes Bioenergy Research Center Michigan State University East Lansing Michigan USA, W. K. Kellogg Biological Station Michigan State University Hickory Corners Michigan USA, Department of Plant, Soil and Microbial Sciences Michigan State University East Lansing Michigan USA

Abstract

Switchgrass ( Panicum virgatum L.) production for biofuel has the potential to produce reasonable yields on lands not suited for conventional agriculture. We assessed nine switchgrass cultivars representing lowland and upland ecotypes grown for 11 years at a site in the upper Midwest USA for belowground differences in soil carbon and nitrogen stocks, soil organic matter fractions, and standing root biomass to 1 m depth. We also compared potential nitrogen mineralization and carbon substrate use through community‐level physiological profiling in surface soils (0–10 cm depth). Average yields and standing root biomass differed among cultivars and between ecotypes, but we found no significant cultivar‐related impacts on soil carbon and nitrogen stocks, on the distribution of particulate and mineral‐associated soil organic matter fractions, nor on potential nitrogen mineralization or microbial community‐level physiological profiles. That these traits did not differ among cultivars suggests that soil carbon and nitrogen gains under switchgrass are likely to be robust with respect to cultivar differences, and to this point not much affected by breeding efforts.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0018409
OSTI ID:
2283460
Alternate ID(s):
OSTI ID: 2579896
Journal Information:
Global Change Biology. Bioenergy, Journal Name: Global Change Biology. Bioenergy Journal Issue: 3 Vol. 16; ISSN 1757-1693
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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