Title: Soil respiration in shrub willow (Salix x dasyclados) biomass crop increased on the third year after removal

Authors: Miraç Aydın; Renato S. Pacaldo; Timothy A. Volk

Addresses: Faculty of Forestry, Watershed Management Department, Kastamonu University, 37100 Kastamonu, Turkey ' College of Forestry and Environmental Studies, Mindanao State University, 9700 Marawi City, Philippines ' Department of Forest and Natural Resources Management, College of Environmental Science and Forestry, State University of New York, 1 Forestry Drive, Syracuse, 13210 New York, USA

Abstract: The SWBC production system is not only a source of renewable energy, but also a carbon sink. However, one of the uncertainties in the greenhouse gas potential analysis of this system is soil CO₂ efflux (F_c) rates after its termination. We examined the F_c rates for three years and determined the total CO₂ production of SWBC fields following the termination and removal of SWBC fields. Four current SWBC fields of 5-, 12-, 14-, and 19-years old were used as sampling plots. The mean F_c rates did not differ statistically between ages (p = 0.66), and there was no significant interaction effect between age and year (p = 0.94). However, F_c rates significantly increased in the third year (p = 0.01). Annual cumulative F_c ratios at different seasons were 52% for summer, 26% for fall, 16% for spring, and 6% for winter.

Keywords: carbon sequestration; dedicated bioenergy crops; soil moisture; soil organic carbon; soil temperature.

DOI: 10.1504/IJGW.2018.091953

International Journal of Global Warming, 2018 Vol.15 No.1, pp.54 - 66

Received: 07 Aug 2016
Accepted: 01 Jan 2017
Published online: 22 May 2018 *

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