Xiaochen Dong

Xiaochen Dong

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Degree MS in NRES
Address 102 Hardin Hall
3310 Holdrege Street
Lincoln NE
68583-0921
E-mail xdong@huskers.unl.edu
Advisor(s) Trenton Franz

n/a

 

Selected Presentations

Improving the Accuracy of Cosmic-Ray Neutron Probe Estimate of Soil Water Content Using Multiple Detectors and Remote Sensing Estimates of Vegetation
  • Presentation Type: Thesis Defense
  • Date: 11/28/2017
  • Abstract:

    The recently developed Cosmic-ray Neutron Probe (CRNP) for estimating soil water content (SWC) fills a critical measurement gap between point scale methods and large scale measurements collected from remote sensing. CRNP works by measuring the change in low-energy neutron intensity over time. However, the accuracy of CRNP to measure SWC is well known to be affected by other hydrogen sources (e.g. soil organic content, atmospheric water vapor, vegetation and surface water). This study focuses on the influence of rapidly growing vegetation in agricultural fields on the accuracy of the CRNP method. Our results indicate that biomass data determined from remote sensing (GrWDRVI) closely follows in-situ sampling of biomass (R2=0.677 for Maize and R2=0.567 for Soybean). We found that local correction factors using bare to moderated ratio removing the influence of vegetation changes can be derived, thus removing bias in the CRNP SWC observations. The improved algorithm for estimating SWC from CRNP will be beneficial for long-term monitoring as well as validating remote sensing SWC products.

Currently this page only displays grants that were awarded on 1/1/2009 to the present. If a grant was awarded prior to 1/1/2009 and is still active, it will not be displayed on this page.

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