扁穗牛鞭草克隆单株地上空间拓展能力与拓展效益多样性研究

Diversification of expansion capacity and efficiency of cloned Hemarthria compressa

以自然高与匍匐茎长度作为横向、纵向空间拓展能力参数,以匍匐茎长与自然高度之比作为植物形态指数,以拓展的空间范围为拓展能力,以单位空间分蘖数作为拓展熵,以单位空间生物量作为拓展效益,对67份处于株型相对稳定的孕穗期的扁穗牛鞭草资源克隆单株空间拓展能力与拓展效益多样性进行了分析比较。结果表明：纵向参数的变异范围（10.67～103.00cm）、变异系数（54.39%）都大于横向参数（54.67～120.67cm、16.94%）;植株形态指数变异范围为1.03～8.72,变异系数高达60.18%;拓展面积变异范围为0.72～5.53m2,变异系数为49.67%;拓展能力变异范围为0.16～5.58m3,变异系数高达104.17%;拓展熵变异系数达74.29%;拓展效益变异范围为0.38~3.16kg/m^3,变异系数为50.34%。单株拓展能力与纵向拓展参数、横向拓展参数及拓展面积为正相关（相关系数分别为0.8908、0.6620、0.6749）;拓展熵与拓展能力为负相关（r=-0.6255）;拓展效益与拓展熵为正相关（r=0.8429）,而与拓展能力为负相关（r=-0.5310）。在欧式距离15处67份材料可分为4类。扁穗牛鞭草种质资源空间拓展能力与拓展效益的多样性,为优异基因型的选择利用和优质品种的选育提供了丰富的资源基础。

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 morphological 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.compressa resources are highly diversified and beneficial to the selection and utilization of excellent breeds and strains.