Delta-Flux: An Eddy Covariance Network for a Climate-Smart Lower Mississippi Basin Page: 3
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tidal marshes of Louisiana (Holm et
al., 2016; Krauss et al., 2016). Most
of the Delta-Flux towers were either
deployed within the last 3 yr or will
begin data collection in 2017 (Fig.
2; Table 1). Two or more of these
are planned as part of the USDA-
ARS Long-Term Agroecosystem
Research (LTAR) LMRB site cen-
tered near Stoneville, MS. Each tower
at these sites contains at minimum a
core eddy covariance measurement
system comprising a three-compo-
nent sonic anemometer and a high-
frequency (>10 Hz) infrared gas
analyzer to measure CO2 and H2O
density to generate a dataset on ver-
tical CO2 and H20 fluxes (Baldocchi,
2003). Supplementary meteorologi-
cal instrumentation allows for the
continuous measurement of relevant
biophysical properties. These data
streams will be supported by mea-
surements of biomass production
(e.g., plant and root growth) and
removal rates (e.g., crop yield, burn-
ing, or hay), soil carbon dynamics,
" Fayetteville Jonesboro
Little Rock ab c O rd
/ B Rouge
N n. -
-94 -93 -92 -91 -90 -89
0 0.5 1 1.5
Frequency of land cover type
out of 3-state cropland area, %
Fig. 2. (A) Project site locations in Arkansas, Mississippi, and Louisiana mapped on the 2015
CropScape crop cover dataset (Han et al., 2014) with selected crops in legend. The numbered
sites are summarized in Table 1 and described in the text. (B) The row-crop tower locations are
compared to the latitudinal distribution of these crops in the three target states determined
from data in plot A. The x axis is in percentage of the total three-state cropland area, per 10-km
and leaf or soil greenhouse gas (CO2, CH4, and nitrous oxide
The network towers are placed in commercial fields of
rice, soybean [Glycine max (Merr.) L.], corn (Zea mays L.),
cotton (Gossypium hirsutum L.), and sugarcane, as well as
pasture, grasslands, and forests. Participating scientists have
established these independent towers from a diverse source
of funds for each of these sites to answer specific, locally
important research questions, much like AmeriFlux itself.
Site researchers each have the aim to quantify site green-
house gas balances, improve mechanistic understanding,
and guide carbon and water cycle research and manage-
ment approaches. Delta-Flux leverages the site-level invest-
ments to work simultaneously and collectively toward the
network goals of obtaining integrated results for the region.
Additionally, Delta-Flux is an open network, and new tower
sites in the region are immediately welcomed to integrate
Table 1. Delta-Flux eddy covariance site descriptions and tower locations, with AmeriFlux site abbreviations where available.
Site no. Location Experiment Operation Project investigators
1 Manila, AR cotton: pivot-irrigated 2016-present Reba, Runkle
2a,b Burdette, AR (US-BdC; US-BdA) rice-a: conventional; b: AWDt 2013-present Reba, Runkle
3a,b,c Humnoke, AR rice-a: conventional; b: AWD irrigation; a,b: 2015-present Runkle, Reba
(US-HRC, US-HRA) c: winter nonflood c: winter 2015-2016 only
4 Crossett Experimental Forest, pine forest: intensive management, uneven age 2013-present Novick
5 Overflow National grassland, annually mowed, migratory bird habitat 2016-present Novick
Wildlife Refuge, AR
6 Goodwin Creek, MS (US-Goo) bluff hills pasture and hay field 2002-2006; 2017-present Rigby, Locke
7a,b,c,d Stoneville, MS a, b: common experiment (base, aspirational); a,b: 2017 (in planning); Rigby, Locke (a,b);
corn-soybean rotation; c: mixed agroecosystem; c: 2015-present; d: 2016- Sui (c); Anapalli (d)
d: soybean and evapostranspiration research present
8 Beasley Lake, MS alluvial plain: row cop and CRPt 2017 planned Locke, Rigby
9a,b Arcola, MS a: corn/soybean; b: rice/soybean a: 2015-present; Sui
10 Russel Sage Wildlife Area, bottomland hardwood and swamp 2013-present Bhattacharjee
Monroe, LA (US-ULM)
11 Chacahoula, LA Sugarcane: continuous cultivation 2016-present White
12a,b Coastal Louisiana Tidal wetlands 2011-2013 Krauss
t AWD , alternate wetting and drying irrigation.
$ CRP, Conservation Reserve Program.
AGRICULTURAL & ENVIRONMENTAL LETTERS
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Runkle, Benjamin R. K.; Rigby, James R.; Reba, Michele L.; Anapalli, Saseendran S.; Bhattacharjee, Joydeep; Krauss, Ken W. et al. Delta-Flux: An Eddy Covariance Network for a Climate-Smart Lower Mississippi Basin, article, February 23, 2017; Madison, Wisconsin. (https://digital.library.unt.edu/ark:/67531/metadc1234363/m1/3/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.