Abstract: How to determine the above-ground biomass and standing grass through the way of image processing were studied.We have obtained the information about the properties of grasses by getting theeffective area through discriminat on analysis of image processing techniques and the internal status of the vertical Lx-ratio changes in the swards.The main purpose of the study was to explore the relationship between information related to theproperties of grasses derived from multimedia techniques and informaion derived from traditional destruc-tive techniques, to build up models according to that relationship, to determine the above-ground biomassof standing grass and to provide the basis for making grassland management systems and regulations.The results are showed that the effective area, the height of leaves surface from soil surface, Lx ratio (0cm,2.5cm,5cm) can be used as indexes to build up a multivariate model to estimate the yield of the above-ground biomass of standing grass

Key words: Standing grass, Image processing, Lx-ratio

摘要： 本试验利用计算机对牧草彩色照片提取特征值的图象处理技术得到了牧草的有效面积。叶表层高度,同时使用光度计测定草丛内部光照强度(Lx)的垂直变化情况,获取有关牧草性状的信息。通过图象处理手段得到的信息与牧草性状之间的关系,建立模型以测定牧草地上部分的现存量,为放牧管理制度提供实施依据。结果表明,在利用图象处理方法进行牧草生物量的估测研究中,采用有效面积(cm²)、叶表层高度(cm)、侧面宽度(cm)、Lx比值(0、2.5和5.0cm)作为指标,可通过建立多元回归模型,估测牧草地上部分现存量。

关键词: 牧草现存量, 图象处理, Lx比值