Doesn't the Spatial Pattern of Herbage Mass in Grazing Bahiagrass Pasture Follow a Gamma Distribution ? : Notes for LIU and HIRATA'S (1995) Paper

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  • バヒアグラス放牧草地における牧草量の空間分布はガンマ分布をしていないか? LIU and HIRATA(1995)論文に対して
  • Doesn′t the Spatial Pattern of Herbage Mass in Grazing Bahiagrass Pasture Follow a Gamma Distribution?:Notes for Liu and Hirata′s(1995)Paper
  • Doesn t the Spatial Pattern of Herbage

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Abstract

SHIYOMI et al. observed theoretically and experimentally in 1983 that the frequency distribution of herbage mass per unit area in grazing pastures was well described by a gamma distribution. They developed later a useful method to estimate the mean and degree of spatial heterogeneity of herbage biomass over the pasture area using the gamma distribution. In 1995, Liu and HIRATA stated in their paper that the goodness of fit test using X^2-statistics showed that the gamma distribution was not applicable to the observed frequency distribution of bio-mass of a Pensacola bahiagrass pasture. In the current paper, we state that (1) the gamma distribution was statistically valid for application to the bahiagrass data, too, and (2) a good estimate of the distribution mean could be obtained by a labor- and time-saving method if a gamma distribution is assumed as a frequency distribution of bahiagrass biomass.

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