Using remote sensing to evaluate the spatial variability of evapotranspiration and crop coefficient in the lower Rio Grande Valley, New Mexico

Pecan is a major crop in the lower Rio Grande Valley (LRGV), New Mexico. Currently, about 11,000 ha of pecan orchards at various stages of growth are consuming about 40% of irrigation water in the area. Pecan evapotranspiration (ET) varies with age, canopy cover, soil type and method of water management. There is a need for better quantification of pecan ET for the purpose of water rights adjudication, watershed management and agronomical practices. This paper describes a process where remote sensing information from Landsat-5 and Landsat-7 were combined with ground level measurements to estimate pecan ET and field scale actual crop coefficient (Kc) for the LRGV. The results showed that annual pecan water use for 279 fields ranged from 498 to 1,259 mm with an average water use of 1,054 mm. For fields with NDVI > 0.6 (normalized difference vegetation index), which represented mature orchards (total of 232 fields), the annual water use ranged from 771 to 1,259 mm with an average water use of 1,077 mm. The results from remote sensing model compared reasonably well with ground level ET values determined by an eddy covariance system in a mature pecan orchard with an average error of 4% and the standard error of estimate (SEE) ranging from 0.91 to 1.06 mm/day. A small fraction (5%) of the pecan fields were within the range of maximum ET and Kc.

[1]  David R. Miller,et al.  Crop coefficients of open-canopy pecan orchards , 2007 .

[2]  Z. Samani,et al.  Estimating Potential Evapotranspiration , 1982 .

[3]  W. J. Massmana,et al.  Eddy covariance flux corrections and uncertainties in long-term studies of carbon and energy exchanges , 2002 .

[4]  S. Nash,et al.  Numerical methods and software , 1990 .

[5]  Zohrab Samani,et al.  Measuring On-Farm Irrigation Efficiency with Chloride Tracing under Deficit Irrigation , 2005 .

[6]  B. Amiro,et al.  Evapotranspiration from a boreal forest drainage basin using an energy balance/eddy correlation technique , 1987 .

[7]  George H. Hargreaves,et al.  Discussion of “Data Requirement for Evapotranspiration Estimation” by Sun F. Shih (September, 1984) , 1985 .

[8]  A. Karnieli,et al.  A mono-window algorithm for retrieving land surface temperature from Landsat TM data and its application to the Israel-Egypt border region , 2001 .

[9]  Frans T. M. Nieuwstadt,et al.  Temperature measurement with a sonic anemometer and its application to heat and moisture fluxes , 1983 .

[10]  W. Massman.  Reply to comment by Rannik on “A simple method for estimating frequency response corrections for eddy covariance systems” , 2001 .

[11]  R. E. Carlson,et al.  Monotone Piecewise Cubic Interpolation , 1980 .

[12]  S. Miyamoto.  Consumptive Water Use of Irrigated Pecans , 1983, Journal of the American Society for Horticultural Science.

[13]  T. Schmugge,et al.  Estimating Riparian ET through Remote Sensing in the Middle Rio Grande , 2006 .

[14]  W. Massman.  A simple method for estimating frequency response corrections for eddy covariance systems , 2000 .

[15]  Vien Tran,et al.  Water Use by Agricultural Crops and Riparian Vegetation: An Application of Remote Sensing Technology , 2009 .

[16]  A. Salim Bawazir,et al.  Estimating Daily Net Radiation over Vegetation Canopy through Remote Sensing and Climatic Data , 2007 .

[17]  E. Swiatek,et al.  Density Fluctuations and Use of the Krypton Hygrometer in Surface Flux Measurements , 1993 .

[18]  E. K. Webb,et al.  Correction of flux measurements for density effects due to heat and water vapour transfer , 1980 .

[19]  George H. Hargreaves,et al.  Reference Crop Evapotranspiration from Temperature , 1985 .

[20]  I. A. Walter,et al.  The ASCE standardized reference evapotranspiration equation , 2005 .

[21]  John R. Schott,et al.  Validation of a web-based atmospheric correction tool for single thermal band instruments , 2005, SPIE Optics + Photonics.

[22]  Richard G. Allen,et al.  Management of irrigation and drainage systems : integrated perspectives , 1993 .

[23]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[24]  S. Liang.  Narrowband to broadband conversions of land surface albedo I Algorithms , 2001 .

[25]  Richard G. Allen,et al.  A Penman for All Seasons , 1986 .

[26]  David R. Miller,et al.  Evapotranspiration of flood-irrigated pecans , 2004 .

[27]  H. D. Bruin,et al.  Oxygen Sensitivity of Krypton and Lyman-α Hygrometers , 2003 .

[28]  R. Skaggs,et al.  Farm size, irrigation practices, and on‐farm irrigation efficiency , 2005 .

[29]  L. Gay,et al.  Tests of a robust eddy correlation system for sensible heat flux , 1992 .

[30]  W. Bastiaanssen.  Regionalization of surface flux densities and moisture indicators in composite terrain. A remote sensing approach under clear skies in Mediterranean climates. , 1995 .

[31]  Richard G. Allen,et al.  Satellite-Based Energy Balance for Mapping Evapotranspiration with Internalized Calibration (METRIC)—Model , 2007 .