Analysis of the spatio-temporal variation in the plant productivity of grazed pastures using field hyperspectral measurements

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To analyze the spatiotemporal variation in the plant productivity of grazed pasture, a ground-based hyperspectral measurement with geostatistical analysis was conducted. Above-ground herbage biomass in an experimental pasture can be estimated from the hyperspectral measurement (350-1050nm) and the partial least squares regression model. Assumed that herbage biomass grows according to the Verhulst's logistic model, the plant productivity was estimated in every measurement point in the pasture. The results indicated that the herbage biomass and plant productivity reached their maximum values in early summer, and decreased as grazing season progressed. The spacial distributions of herbage biomass and plant productivity became more homogeneous in autumn than in summer.