Diversification of expansion capacity and efficiency of cloned Hemarthria compressa

Choosing cloned individual Hemarthria compressa unit natural height and stolon length as horizontal and vertical parameters, stolon length to natural height ratio as plant shape index, spacial expansion volume as expansion capacity, unit volume tiller number as expansion entropy and unit volume biomass as expansion efficiency, spatial expansion capacity and efficiency of 67 individuals of H. compressa were analyzed and compared in booting stage. The variation range (10.67～103.00cm) and coefficient of variation (CV,54.39%) of vertical parameter are higher than those of horizontal parameters (54.67～120.67cm, 16.94%). The variation range of orphological index is 1.03～8.72 with 60.18% CV, expansion area is 0.72～5.53m² with 49.67% CV, expansion capacity is 0.16～5.58m³ with 104.17% CV, expansion efficiency is 0.38～3.16kg/m³ with 50.34% CV and expansion entropy CV is 74.29%. A positive correlation exists between individual plant expansion capacity and vertical and horizontal parameters as well as expansion area with correlation coefficients of 0.8908, 0.6620 and 0.6749, respectively. There is also a positive correlation between expansion efficiency and expansion entropy (_r=0.8429), while a negative correlation exists between expansion capacity and expansion efficiency (_r=-0.5310) and entropy (_r=-0.6255). Through cluster analysis, the sixty-seven resources are categorized into four groups, at an euclidean distances of 15. Spatial expansion capacity and efficiency of H. ompressa resources are highly diversified and beneficial to the selection and tilization of excellent breeds and strains.