松嫩平原硬质早熟禾果后营养期无性系分蘖株的数量特征分析

Analysis on Quantitative Characteristic of Tillers on Poa sphondylodes Clones in the Songnen Plain

[目的]对松嫩平原割草地的硬质早熟禾冬眠构件结构进行比较和定量分析。[方法]采用大样本随机挖取单个无性系的调查和测定方法,分析了松嫩平原碱化草甸硬质早熟禾无性系冬眠构件的结构及其生长规律。[结果]在生长季末期,硬质早熟禾无性系冬眠构件是由冬眠苗和冬眠芽组成,其中冬眠苗为61.60±31.14个,平均占92.19%,冬眠芽为5.37±5.10个,占7.81%。从相对数量指标变异系数来看,以冬眠芽的变异最大,变异系数高达94.97%,丛径最小,为40%;在冬眠构件的结构中,以冬眠苗的变异系数最小,为50.55%。[结论]割草有利于星星草种群和无性系冬眠构件的形成,尤其有利于冬眠苗的形成。硬质早熟禾无性系冬眠构件中冬眠苗数和冬眠芽数均与丛径和总蘖数之间呈极显著的正相关关系。

[ Objective] The aim was to compare and analyze the dormancy modules of P. sphondylodes in mowing land in Songnen Plain. [ Method] The investigation and measure method with randomly digging the single clone as big samples were used to analyze the structure and growth law of dormancy modules of P. sphondylodes clone in alkalization meadow in Songnen plain. [Result] In the end of growth season, the dormancy modules of P. sphondyodes clones were consisted of dormancy seedlings and dormancy buds. The number of dormancy seedlings and dormancy buds of P. sphondylodes clones was 61.60±31.14 （92.19%） and 5.37 ± 5.10（7.81 % ） resp. As for the variant coefficient of relative quantity index, the variation coefficient of dormancy bud was the greatest, being up to 94.97%, and that of the tuft size was the smallest, reaching 40%. In the structure of donvancy component, the variant coefficient of dormancy seedling was the smallest, reaching 50.55 %. [ Conclusion] The mowing made for the formation of Puccinellia tenuiflora population and the clone dormancy modules, specially for the formation of dormancy seedlings. The numbers of dormancy seedlings and dormancy buds had significantly positive correlation with the nambers of tuft size real total tillers in the dormancy modules of P. sphondylodes clones.