title: Modeling the impacts of temperature and precipitation changes on soil CO2 fluxes from a Switchgrass stand recently converted from cropland.
abstract: Switchgrass (Panicum virgatum L.) is a perennial C4 grass native to North America and successfully adapted to diverse environmental conditions. It offers the potential to reduce soil surface carbon dioxide (CO2) fluxes and mitigate climate change. However, information on how these CO2 fluxes respond to changing climate is still lacking. In this study, CO2 fluxes were monitored continuously from 2011 through 2014 using high frequency measurements from Switchgrass land seeded in 2008 on an experimental site that has been previously used for soybean (Glycine max L.) in South Dakota, USA. DAYCENT, a process-based model, was used to simulate CO2 fluxes. An improved methodology CPTE [Combining Parameter estimation (PEST) with "Trial and Error" method] was used to calibrate DAYCENT. The calibrated DAYCENT model was used for simulating future CO2 emissions based on different climate change scenarios. This study showed that: (i) the measured soil CO2 fluxes from Switchgrass land were higher for 2012 which was a drought year, and these fluxes when simulated using DAYCENT for long-term (2015-2070) provided a pattern of polynomial curve; (ii) the simulated CO2 fluxes provided different patterns with temperature and precipitation changes in a long-term, (iii) the future CO2 fluxes from Switchgrass land under different changing climate scenarios were not significantly different, therefore, it can be concluded that Switchgrass grown for longer durations could reduce changes in CO2 fluxes from soil as a result of temperature and precipitation changes to some extent.
authors.affiliation: Department of Plant Science, South Dakota State University, Brookings, South Dakota 57007, USA. Electronic address: liming.lai@sdstate.edu.
authors.forename: Liming
authors.initials: L
authors.lastname: Lai
authors.affiliation: Department of Plant Science, South Dakota State University, Brookings, South Dakota 57007, USA. Electronic address: Sandeep.Kumar@sdstate.edu.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Department of Plant Science, South Dakota State University, Brookings, South Dakota 57007, USA.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Chintala
authors.affiliation: North Central Sun Grant Center, South Dakota State University, Brookings, South Dakota 57007, USA.
authors.forename: Vance N
authors.initials: VN
authors.lastname: Owens
authors.affiliation: Department of Plant Science, South Dakota State University, Brookings, South Dakota 57007, USA.
authors.forename: David
authors.initials: D
authors.lastname: Clay
authors.affiliation: Department of Plant Science, South Dakota State University, Brookings, South Dakota 57007, USA.
authors.forename: Joseph
authors.initials: J
authors.lastname: Schumacher
authors.affiliation: Center of Excellence in Environmental Studies (CEES), King Abdulaziz University, Abdullah Sulayman, Jeddah 22254, Saudi Arabia.
authors.forename: Abdul-Sattar
authors.initials: AS
authors.lastname: Nizami
authors.affiliation: Kangwon National University, Chuncheon 200-701, South Korea.
authors.forename: Sang Soo
authors.initials: SS
authors.lastname: Lee
authors.affiliation: Joint Global Change Research Institute, Pacific Northwest National Lab, College Park, Maryland 20740, USA.
authors.forename: Rashad
authors.initials: R
authors.lastname: Rafique
mesh_terms: D000383:Agriculture; D002245:Carbon Dioxide / Q000032:analysis*; D057231:Climate Change; D004784:Environmental Monitoring / Q000379:methods*; D008956:Models, Chemical; D008897:Panicum / Q000502:physiology*; D011891:Rain; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature
chemical_list: D012987:Soil; D012989:Soil Pollutants; D002245:Carbon Dioxide
keywords: Carbon dioxide; Climate change; DAYCENT; Switchgrass