Biomass from landscape management of grassland used for biogas production: effects of harvest date and silage additives on feedstock quality and methane yield
Abstract
Abstract Biogas production from grassland biomass harvested during landscape management may help to maintain species‐rich grassland biotopes, but extensive management and late harvests often result in low‐quality biomass. Biogas production from the vegetation ofAlopecuretum pratensis,Molinietum caeruleaeandCaricetum gracilis, three typical grassland biotopes in northGerman nature reserves, was investigated in relation to harvest date. In addition, theA. pratensisvegetation was investigated for ensiling and the application of bacterial silage additives. Results indicate that biogas production might be a reasonable utilization pathway for grassland biomass from landscape management if the first cut occurs up to late summer. Methane yields of grassland biomass decreased substantially with later harvest, from up to 309 lN kg−1organic dry matter (ODM) inMay to below 60 lN kg−1ODMinFebruary, in correlation with increasing crude fibre contents.Caricetum gracilisvegetation was the least suitable feedstock for biogas production. It showed a rapid decline in methane yields with later harvest and 25% lower methane yields compared with other types of grassland vegetation. Application of silage additives is recommended for adequate preservation of grassland biomass from landscape management by ensiling. Addition of homofermentative lactic acid bacteria improved acidification during ensiling if sufficient fermentable sugar was available. The use of inoculant and molasses enhanced methane yields by 3–55%. Additional carbohydrate source is necessary to ensure proper ensilage when grasses are harvested after late autumn.
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Fibre fractions are reported to be negatively correlated to the methane yield.
“Fibre fractions are reported to be negatively correlated to the methane yield (Herrmann et al., 2014;Rath et al., 2013)”
From Improving aerobic stability and biogas production of maize silage using silage additives (2015) · cites this paper as Herrmann et al., 2014
An enhancing effect of silage fermentation on methane yields based on ODM added to the anaerobic digestion process as compared with methane yields of biomass prior to ensiling is in accordance with findings in literature.
“An enhancing effect of silage fermentation on methane yields based on ODM added to the anaerobic digestion process as compared with methane yields of biomass prior to ensiling is in accordance with findings in literature (e.g.Gao et al., 2012;Herrmann et al., 2014;Kafle and Kim, 2013) and was discussed in detail previously (Herrmann et al., 2011).”
From Improving aerobic stability and biogas production of maize silage using silage additives (2015) · cites this paper as Herrmann et al., 2014
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Improving aerobic stability and biogas production of maize silage using silage additives
Herrmann, C., Idler, C., & Heiermann, M. (2015) · Bioresource Technology · doi:10.1016/j.biortech.2015.08.114 · Cited by 90 · see citing works
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- Authors
- Herrmann, C., Prochnow, A., Heiermann, M., & Idler, C.
- Affiliations
- Leibniz Institute for Agricultural Engineering and Bioeconomy (DE)
- Humboldt-Universität zu Berlin (DE)
- Corresponding author
- Herrmann, C.
- Venue
- Grass and Forage Science
- Publisher
- Wiley
- Published
- 2013-09-19
- Volume
- 69
- Issue
- 4
- Pages
- 549-566
- ISSN
- 0142-5242 (ISSN-L)
- 1365-2494
- OpenAlex
- W2041377547
- Cited by
- 67
- References
- 32
- Citations by year
- 2026: 2 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 5 · 2021: 9 · 2020: 7 · 2019: 8 · 2018: 4 · 2017: 9 · 2016: 4 · 2015: 6 · 2014: 3
- FWCI
- 7.54
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Grass and Forage Science (publishedVersion)
- Funders
- Leibniz-Gemeinschaft
- Topics
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
- Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
- Keywords
- biogas production, grassland biomass, harvest time, silage additives, methane yield, feedstock quality, landscape management, silage fermentation, homofermentative lactic acid bacteria, inoculants, molasses, crude fiber, species-rich grasslands, protected areas
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