割草场不同演替系列羊草和光稃茅香种群构件结构的研究

对松嫩平原割草场空间演替系列中羊草Leymus chinensis和光稃茅香Hierochloe glabra种群构件的结构进行了研究。结果表明,在5月中旬,2种植物的现实种群均以冬性株占绝对优势,羊草为98.6%~100%,光稃茅香为97.6%~100%;潜在种群中分蘖节芽所占比例羊草为34.1%~61.0%,光稃茅香为30.8%~73.9%,根茎芽所占比例分别为49.0%~65.9%和26.1%~69.1%,芽库的输出率分别为34.7%~38.3%和25.7%~43.9%。当时2种群的1龄根茎尚未形成,根茎累积长度与生物量均以2龄为主。羊草的更新能力高于光稃茅香,在5个演替系列中,随着羊草种群数量的增大,光稃茅香的数量不断地减少。随着演替时间的增加,羊草将逐渐取代光稃茅香而成为割草场的优势种群。

Analyse of the modular structures of populations on Leymus chinensis and Hierochloe glabra in different succession series in cutting grassland

This experiment studied the modular structure of populations on Leymus chinensis and Hierochloe glabra in the spatial succession series that were investigated in the cutting grassland in Songnen Plain of China.The results showed that winterness tillers were dominant in the realistic populations of L.chinensis and H.glabra in the middle days of May.The proportion of their winterness tillers were 98.6%~100% in L.chinensi population and 97.6%~100% in H.glabra population.The buds of tiller nodes were 34.1%~61.0% and 30.8%~73.9%,and the buds of their rhizomes were 49.0%~65.9% and 26.1%~69.1% in the potential populations of L.chinensis and H.glabra respectively.The export percentages of the buds were 34.7%~38.3% in L.chinensis population and 25.7%~43.9% in H.glabra population.The rhizomes of the 1st age class of two populations had not been formed by then.The cumulate length and biomass of their rhizomes were mainly the 2nd age class.The renewal capability of population of L.chinensis was better than H.glabra.With the increasing of the number of L.chinensis,the number of L.chinensis were declining incessantly in these succession series.With the increasing of succession time,the population of L.chinensis would become the dominant population instead of H.glabra in this cutting grassland.