Seasonal changes in the albedo of a maize crop during two seasons

Abstract The albedo of a maize crop during the growing seasons of 1985 and 1986 was monitored from mid-May (bare soil condition) until mid-October (harvest). The precipitation and irradiation regimes were quite different during both years, giving rise to different growth and albedo patterns. A simple model was used to calculate mean daily albedos from plant and soil characteristics, and the results were validated with the measured data. On average, the calculated values agreed to within 3% of the mean measured daily albedos during both years. The mean standard error of the estimate was 0.02 during both seasons. For individual days however the simple model calculations could show considerable deviation from the experimental data. If the course of the diurnal albedo is required, a more detailed model can be used in which the direct and diffuse irradiation fluxes are treated separately, and the water content of the underlying soil must be known. On average, the calculated values agree to within 4 and 2% for a fine day and an overcast day, respectively.

[1]  J. Goudriaan,et al.  SEPARATING THE DIFFUSE AND DIRECT COMPONENT OF GLOBAL RADIATION AND ITS IMPLICATIONS FOR MODELING CANOPY PHOTOSYNTHESIS PART I. COMPONENTS OF INCOMING RADIATION , 1986 .

[2]  Adrie F. G. Jacobs,et al.  Changes of the displacement height and roughness length of maize during a growing season , 1988 .

[3]  de J.B.R.M. Jong.  Een karakterisering van de zonnestraling in Nederland , 1980 .

[4]  J. B. Stewart.  The albedo of a pine forest , 1971 .

[5]  J. Davies,et al.  Reflection coefficients, heating coefficients and net radiation at Simcoe, southern Ontario , 1969 .

[6]  C. Przybyła,et al.  Application and accuracy of a dialectric soil water content meter. , 1987 .

[7]  Raoul Lemeur,et al.  A critical review of light models for estimating the shortwave radiation regime of plant canopies , 1974 .

[8]  C. T. Wit.  Photosynthesis of leaf canopies , 1965 .

[9]  The Effect of Crop and Climatic Factors on the Radiation Balance of an Irrigated Maize Crop , 1968 .

[10]  C.J.T. Spitters,et al.  Separating the diffuse and direct component of global radiation and its implications for modeling canopy photosynthesis Part II. Calculation of canopy photosynthesis , 1986 .

[11]  J. Goudriaan,et al.  Crop Micrometeorology: A Simulation Study , 1977 .

[12]  W. E. Loomis,et al.  Absorption Spectra of Leaves. I. The Visible Spectrum. , 1952, Plant physiology.

[13]  N. Robinson.  Solar radiation , 2020, Advanced Remote Sensing.

[14]  Jetse D. Kalma,et al.  Radiation balance of natural and agricultural vegetation , 1966 .

[15]  R. Dickinson.  Land Surface Processes and Climate—Surface Albedos and Energy Balance , 1983 .

[16]  J. Monteith,et al.  Principles of Environmental Physics , 2014 .

[17]  J. Ross.  The radiation regime and architecture of plant stands , 1981, Tasks for vegetation sciences 3.

[18]  D. Baldocchi,et al.  Seasonal variations in the radiation regime within an oak-hickory forest , 1984 .