NDLI: Carbon Sequestration in Fine Roots and Foliage Biomass Offsets Soil CO$_{2}$ Effluxes along a 19-year Chronosequence of Shrub Willow (Salix x dasyclados) Biomass Crops

Content Provider	Springer Nature Link
Author	Pacaldo, Renato S. Volk, Timothy A. Briggs, Russell D.
Copyright Year	2014
Abstract	Previous greenhouse gas (GHG) assessments for the shrub willow biomass crops (SWBC) production system lacked quantitative data on the soil CO$_{2}$ efflux (F$_{c}$). This study quantifies the mean annual cumulative F$_{c}$, the C sequestration in the above- and belowground biomass, and the carbon balance of the production system. We utilized four SWBC fields, which have been in production for 5, 12, 14, and 19 years. Two treatments were applied: continuous production (CP)—shrub willows were harvested, and stools were allowed to regrow, and tear-out (TO) (crop removal)—shrub willows were harvested, and stools were sprayed with herbicide following spring, crushed, and mixed into the soil. Mean annual cumulative F$_{c}$ were measured using dynamic closed chambers (LI-8100A and LI-8150). Across different age classes, the mean cumulative F$_{c}$ ranged from 27.2 to 35.5 Mg CO$_{2}$ ha$^{−1}$ year$^{−1}$ for CP and 26.5 to 29.3 Mg CO$_{2}$ ha$^{−1}$ year$^{−1}$ for TO. The combined carbon (C) sequestration of the standing above- and belowground biomass, excluding stems, ranged from 50.6 to 94.8 Mg CO$_{2}$ eqv. ha$^{−1}$. In the CP treatment, the annual C sequestration in the fine roots and foliage offsets the annual cumulative F$_{c.}$ Across different age classes, C balances ranged from −21.5 to −59.3 Mg CO$_{2}$ ha$^{−1}$ for CP and 26.5 to 29.3 Mg CO$_{2}$ ha$^{−1}$ for TO. The GHG potential of SWBC is about −36.3 Mg CO$_{2}$ eqv. ha$^{−1}$ at the end of 19 years, suggesting that the SWBC system sequesters C until termination of the crop.
Starting Page	769
Ending Page	776
Page Count	8
File Format	PDF
ISSN	19391234
Journal	BioEnergy Research
Volume Number	7
Issue Number	3
e-ISSN	19391242
Language	English
Publisher	Springer US
Publisher Date	2014-02-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Greenhouse gas Carbon balance Continuous production Tear-out Willow fields Plant Sciences Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Ecology Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Agronomy and Crop Science

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