Soil carbon sequestration potential of willows in short-rotation coppice established on abandoned farm lands
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We carried out a paired-site study (Melanic Brunisol) to assess the impact on soil carbon stocks of land-use change following establishment and multiple rotations of willows (Salix miyabeana SX67) in short-rotation coppice (SRWC).
Total soil organic carbon (TSOC), hot-water extractable carbon (HWC) and amino sugars (AS) were used as main parameters of soil carbon dynamic.
We found that the establishment event and 2 years of growth under SRWC did not result in any change in the TSOC pool or in the HWC pool. However, we found an increase in AS at and near the soil surface (0–20 cm) of the establishing willow plantations. We related this to the effect of the green manure applied before planting. After multiple rotations of SRWC, we found a redistribution of TSOC in the vertical profile (0–40 cm) but no TSOC difference compared to previous land-use (abandoned alfalfa crop). In the subsoil (20–40 cm), we found indications that the more labile soil organic carbon (SOC) pools were depleted (HWC and muramic acid).
Willow plantations on Melanic Brunisol in southern Quebec (Canada) represent, over the long-term, a soil carbon sink when replacing a short-term no-till crop rotation. However, the conversion from abandoned alfalfa fields into SRWC does not apparently enhance soil carbon potential sequestration.
KeywordsSalix Cropping systems C sequestration Alfalfa SRWC Carbon sink
Soil organic carbon
Soil organic matter
Total soil organic carbon
Hot-water extractable carbon
Short-rotation willow coppice
We would like to thank Martin Chantigny of the Soils and Crops Research and Development Centre in Quebec for assistance with data collection and analysis. Special thanks also to Marc Lucotte of the University of Quebec in Montreal and Marie-Claude Turmel of the University of Montreal for their help with soil analysis. This study was financially supported by the Canadian Federal Interdepartmental Program on Energy Research and Development (PERD). Thanks to the technical staff of the Boisbriand experimental farm (CERVEAU) and to Huntingdon land owner, Rolland Guillon. Thanks to Karen Grislis for her critical review of the manuscript. Finally, we are grateful to two anonymous reviewers for providing many helpful comments on an earlier draft of this paper.
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