Miscanthus × giganteus leaf senescence, decomposition and C and N inputs to soil
Abstract
Energy crops are currently promoted as potential sources of alternative energy that can help mitigate the climate change caused by greenhouse gases (GHG s). The perennial crop Miscanthus × giganteus is considered promising due to its high potential for biomass production under conditions of low input. However, to assess its potential for GHG mitigation, a better quantification of the crop's contribution to soil organic matter recycling under various management systems is needed. The aim of this work was to study the effect of abscised leaves on carbon (C) and nitrogen (N) recycling in a Miscanthus plantation. The dynamics of senescent leaf fall, the rate of leaf decomposition (using a litter bag approach) and the leaf accumulation at the soil surface were tracked over two 1‐year periods under field conditions in Northern France. The fallen leaves represented an average yearly input of 1.40 Mg C ha−1 and 16 kg N ha−1. The abscised leaves lost approximately 54% of their initial mass in 1 year due to decomposition; the remaining mass, accumulated as a mulch layer at the soil surface, was equivalent to 7 Mg dry matter (DM) ha−1 5 years after planting. Based on the estimated annual leaf‐C recycling rate and a stabilization rate of 35% of the added C, the annual contribution of the senescent leaves to the soil C was estimated to be approximately 0.50 Mg C ha−1 yr−1 or 10 Mg C ha−1 total over the 20‐year lifespan of a Miscanthus crop. This finding suggested that for Miscanthus, the abscised leaves contribute more to the soil C accumulation than do the rhizomes or roots. In contrast, the recycling of the leaf N to the soil was less than for the other N fluxes, particularly for those involving the transfer of N from the tops of the plant to the rhizome.
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The most obvious factor is the effect of temperature on the mean residence time of leaf Miscanthus litter derived in litter bags and laboratory incubations.
“Most obvious is the effect of temperature on the MRT of leaf Miscanthus litter derived in litter bags and laboratory incubations [62, 64, 69, 108, 122].”
From Carbon Sequestration by Perennial Energy Crops: Is the Jury Still Out? (2015) · cites this paper as [69]
The commonly used litter bag method prevents physical incorporation of debris into the soil and does not allow access of larger biota such as earthworms.
“The commonly used litter bag method [64, 69, 78] prevents physical incorporation of the debris into the soil and does not allow access of larger biota (e.g. earthworms).”
From Carbon Sequestration by Perennial Energy Crops: Is the Jury Still Out? (2015) · cites this paper as [69]
Potential decomposition rates of Miscanthus residues decreased in order from young rhizome to litter and roots, with mean residence time ranging from 1.2 to 2.4 years.
“Potential decomposition rates of Miscanthus residues, both in situ (litter bags) and by laboratory incubation, decreased in order from young rhizome to litter and roots, with MRT ranging from 1.2 to 2.4 years [64, 69], similar to other results [62].”
From Carbon Sequestration by Perennial Energy Crops: Is the Jury Still Out? (2015) · cites this paper as [69]
Miscanthus litter is higher in lignin than other grasses and seems to reduce the turnover rate of existing soil organic carbon by increasing the insoluble carbon fraction resistant to microbial attack.
“Miscanthus, whose litter is higher in lignin than other grasses [69], seems to reduce the turnover rate of existing SOC by increasing the insoluble C fraction resistant to microbial attack [116, 150].”
From Carbon Sequestration by Perennial Energy Crops: Is the Jury Still Out? (2015) · cites this paper as [69]
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- Authors
- Amougou, N., Bertrand, I., Cadoux, S., & Recous, S.
- Affiliations
- Fractionnation of AgroResources and Environment (FR)
- INRA, US1158 Agro‐Impact F‐02000 Laon France
- Corresponding author
- Recous, Sylvie
- Venue
- GCB Bioenergy
- Publisher
- Wiley
- Published
- 2012-10-04
- Volume
- 4
- Issue
- 6
- Pages
- 698-707
- ISSN
- 1757-1693 (ISSN-L)
- 1757-1707
- OpenAlex
- W2159758743
- Semantic Scholar
- 16e770ecaaacd726b919e2c88cc1ca76ca7b4c21
- Cited by
- 64
- References
- 42
- Citations by year
- 2025: 6 · 2024: 3 · 2023: 2 · 2022: 3 · 2021: 2 · 2020: 6 · 2019: 4 · 2018: 4 · 2017: 7 · 2016: 8 · 2015: 4 · 2014: 9 · 2013: 5 · 2012: 1
- FWCI
- 12.21
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- GCB Bioenergy (publishedVersion)
- HAL (submittedVersion)
- Funders
- Institut National de la Recherche Agronomique
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Bioenergy crop production and management
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Environmental Science › Ecology › Environmental and biological studies
- Keywords
- Miscanthus × giganteus, leaf senescence, leaf litter decomposition, carbon cycle, nitrogen cycling, soil organic matter, energy crops, carbon stabilization, greenhouse gas emissions reduction
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