分级加权法
分级加权法-
将草坪植被的表观特征（盖度、密度、频度）、色泽（叶绿素含量）、质地（受力作用）5项指标进行定量分级，通过加权平均法所求得分，确定质量标准。
Quality standards were determined through five index grades including apparent characteristics ( cover , density , frequency ), color ( chlorophyl content ), texture ( resistance to mechanical stress ), the grades were calculated with weighted means .