Comparing independent estimates of carbon dioxide exchange over 5 years at a deciduous forest in the southeastern United States

2001 ◽  
Vol 106 (D24) ◽  
pp. 34167-34178 ◽  
Author(s):  
Kell B. Wilson ◽  
Dennis D. Baldocchi
Keyword(s):  
United States ◽  
Carbon Dioxide ◽  
Deciduous Forest ◽  
Southeastern United States ◽  
Carbon Dioxide Exchange

scholarly journals Carbon dioxide exchange and nocturnal processes over a mixed deciduous forest

1996 ◽  
Vol 81 (1-2) ◽  
pp. 13-29 ◽  
Author(s):  
Xuhui Lee ◽  
T.Andrew Black ◽  
Gerry den Hartog ◽  
Harold H. Neumann ◽  
Zoran Nesic ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Deciduous Forest ◽  
Carbon Dioxide Exchange ◽  
Mixed Deciduous Forest

scholarly journals Biogenic isoprene emission: Model evaluation in a southeastern United States bottomland deciduous forest

1997 ◽  
Vol 102 (D15) ◽  
pp. 18889-18901 ◽  
Author(s):  
Christopher D. Geron ◽  
Dalin Nie ◽  
Robert R. Arnts ◽  
Thomas D. Sharkey ◽  
Eric L. Singsaas ◽  
...  
Keyword(s):  
United States ◽  
Model Evaluation ◽  
Deciduous Forest ◽  
Southeastern United States ◽  
Emission Model ◽  
Isoprene Emission

scholarly journals Assessment of Forest Biomass Estimation from Dry and Wet SAR Acquisitions Collected during the 2019 UAVSAR AM-PM Campaign in Southeastern United States

2020 ◽  
Vol 12 (20) ◽  
pp. 3397
Author(s):  
Unmesh Khati ◽  
Marco Lavalle ◽  
Gustavo H. X. Shiroma ◽  
Victoria Meyer ◽  
Bruce Chapman
Keyword(s):  
United States ◽  
Deciduous Forest ◽  
Cloud Model ◽  
Southeastern United States ◽  
Forest Biomass ◽  
Estimation Accuracy ◽  
Biomass Estimation ◽  
Temperate Deciduous Forest ◽  
Multi Temporal ◽  
L Band

Forest above-ground biomass (AGB) estimation from SAR backscatter is affected by varying imaging and environmental conditions. This paper quantifies and compares the performance of forest biomass estimation from L-band SAR backscatter measured selectively under dry and wet conditions during the 2019 AM-PM NASA airborne campaign. Seven Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) images acquired between June and October 2019 over a temperate deciduous forest in Southeastern United States with varying moisture and precipitation conditions are examined in conjunction with LIDAR and field measurements. Biomass is estimated by fitting a 3-parameter modified Water Cloud Model (WCM) to radiometric terrain corrected SAR backscatter. Our experiment is designed to quantify the biomass estimation errors when biomass models are calibrated and validated on varying acquisition conditions (dry or wet). Multi-temporal estimation strategies are also evaluated and compared with single-acquisition estimation approaches. As an outcome, the experiment shows that the WCM model calibrated and validated on single acquisitions adapts to different soil moisture conditions with RMSD up to 18.7 Mg/ha. The AGB estimation performance, however, decreases with RMSD upwards of 30 Mg/ha when the model is cross-validated on moisture and precipitation conditions different than the calibration conditions. Results confirm that calibrating the model over the multi-temporal data using averaged backscatter or weighted combinations of individual AGB estimates, improves the biomass estimation accuracy up to about 20% at L-band. This study helps design biomass cal/val procedures and biomass estimation algorithms for dense time-series to be collected by low-frequency radar missions such as NASA-ISRO SAR (NISAR) and BIOMASS.

scholarly journals Efficacy of Dikegulac Sodium Applied to Pruned and Unpruned ‘Limelight’ Hydrangea Grown at Two Locations in the Southeastern United States

2013 ◽  
Vol 23 (6) ◽  
pp. 836-842 ◽  
Author(s):  
Diana R. Cochran ◽  
Amy Fulcher ◽  
Guihong Bi
Keyword(s):  
United States ◽  
Carbon Dioxide ◽  
Plant Growth ◽  
Growth Regulators ◽  
Cultural Practices ◽  
Southeastern United States ◽  
Growth Index ◽  
Flower Number ◽  
Additional Control ◽  
Number Of Branches

Pruning is commonly performed during production of nursery crops to produce symmetrical, compact plants that are pleasing to the consumer’s eye. To achieve the desired results, nursery growers hand prune or apply plant growth regulators (PGRs). However, hand pruning is expensive and is not always effective, and efficacy of PGRs can depend on cultural practices, environmental conditions, irrigation, cultivar, and rate. Therefore, the objective of these experiments was to evaluate the effect of dikegulac sodium applied to pruned or unpruned ‘Limelight’ hardy hydrangea (Hydrangea paniculata). Plants were grown at two locations, Tennessee (TN) and Mississippi (MS). The pruned treatment consisted of hand pruning, leaving three nodes followed by applications of dikegulac sodium (400, 800, or 1600 ppm). Applications of dikegulac sodium to pruned or unpruned plants were made the same day using a carbon dioxide backpack sprayer. There were two additional control treatments: hand-pruned untreated (hand-pruned) and unpruned untreated (untreated). Plants were grown outdoors under full sun in TN and under 40% shade in MS. Data were collected at the close of the experiment on the number of branches over 1 inch, final growth index (FGI), floral attributes, branch symmetry, and phytotoxicity. At both locations, pruned and unpruned plants treated with 800 or 1600 ppm dikegulac sodium had more branches than the hand-pruned and unpruned plants. Flower number and size tended to be greater for unpruned plants than pruned plants. Phytotoxicity was observed at 2 and 6 weeks after treatment (WAT). For plants grown in TN, symptoms were more pronounced on plants following treatment with 800 (pruned plants) and 1600 ppm (pruned and unpruned) dikegulac sodium compared with the untreated plants. There were no visible phytotoxicity symptoms at 6 WAT for plants grown in MS, regardless of treatment.

scholarly journals Growing season variability in carbon dioxide exchange of irrigated and rainfed soybean in the southern United States

2017 ◽  
Vol 593-594 ◽  
pp. 263-273 ◽  
Author(s):  
Pradeep Wagle ◽  
Prasanna H. Gowda ◽  
Saseendran S. Anapalli ◽  
Krishna N. Reddy ◽  
Brian K. Northup
Keyword(s):  
United States ◽  
Carbon Dioxide ◽  
Growing Season ◽  
Southern United States ◽  
Carbon Dioxide Exchange
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