【摘要】 对在不同生境的2个生态型羊草叶片、分蘖株的生长指标进行测定,为提高牧草生产产量和质量提供理论依据。在沙土和盐碱土生境下,灰绿生态型和黄绿生态型羊草不同龄级分蘖株叶生物量均随分蘖株生物量、高度的增加而增加,不同叶位的叶宽也随叶长的增加而增加。经回归分析,叶生物量与分蘖株生物量、高度之间,叶宽与叶长之间关系符合y=axb幂函数的生长关系,达到显著或极显著相关。方程中的b值表示叶生物量或叶宽的增加速率。在所用函数中,幂函数变化规律更具有生物学和生态学意义。在松嫩平原的繁殖期,灰绿型和黄绿型羊草不同龄级分蘖株叶构件具有相同的异速生长和生物量积累规律。2个生态型羊草叶构件的生物量、叶长、叶宽、生长和生物量积累规律等在相同生态型不同生境之间,相同生境不同生态型之间,以及不同龄级分蘖株之间的各个数量指标均有一些差异,但变化幅度不大,是2个生态型对其所在生境产生的相应适应性反应,具有明显的生态可塑性。更多还原

【Abstract】 Growth indices of leaf and tiller of two ecotypes of Leymus chinensis were determined in different habitats.This paper provides a theoretical basis for improving yield and quality of pasture production.Under sand and saline-alkali soil habitats,leaf biomass of different age tillers increased with an increase of height in the grey-green and yellow-green ecotypes of L.chinensis.It showed a significant power relationship(y=ax~b) between biomass and height of tiller and between leaf biomass and leaf length and width.The b value in the function expressed growth rate of biomass and width of leaf.The power function had more biological and ecological meaning than other functions.The leaf modules of different age tillers of grey-green and yellow-green ecotypes had the same regulation of allometry and biomass accumulation at the reproductive stage in the Songnen Plain.All quantity indices,such as biomass,length and width of leaf and regulation of biomass accumulation,were different between the two habitats of the same ecotype and between the two ecotypes at the same habitat.The results showed both ecotypes had adapted to their corresponding habitat and obviously had ecological plasticity.更多还原