草业学报2025，Vol.34Issue(5)：64-73,10.DOI:10.11686/cyxb2024230
新疆针茅传播体形态及埋深对种子萌发出苗的影响
Dispersal unit morphology,and effects of burial depth on seed germination and emergence of Stipa sareptana
摘要
Abstract
Stipa sareptana,a perennial herb of the Poaceae,is an important community constructive and dominant species widely distributed in desert grassland of Xinjiang.This research studied the morphology of the dispersal unit,the function of the awn and the germination and emergence characteristics of S.sareptana seeds.The relationship between the morphology of each part of the dispersal unit and the buried depth was analyzed,and the effects of different burial depths on seed germination and seedling emergence were compared.The results show that:1)The dispersal unit is composed of lemma,palea and caryopsis.The base of the lemma is sharp and hairy with an anchoring capability.The lemma elongates to form an awn,and the elongated body of the awn is typically doubly bent.The length of the awn is 15 times than that of the seed.2)The awn is hygroscopic,and the hygroscopic awn drives a self-burial phenomenon of the dispersal unit.The burial depth achieved is(4.10±0.53)cm.3)Burial depth had a very significant effect on the seed germination percentage and seedling emergence percentage of S.sareptana seeds(P<0.01).The seeds germinated in the depth range of 0-12 cm,and emerged from depths<6 cm.The seed germination percentage and seedling emergence percentage were highest when the burial depth was 1-2 cm.When the burial depth exceeded 2 cm,the seed germination percentage and seedling emergence percentage were negatively correlated with the burial depth.4)The burial depth had a significant effect on the growth and biomass allocation of S.sareptana seedlings(P<0.01).When the buried depth increases,S.sareptana seedlings allocate more biomass to upward growth,thus promoting the growth of shoots above ground.The plasticity of biomass distribution is an important mechanism for S.sareptana to adjust to variation in burial depth.The unique dispersal unit structure of S.sareptana not only enhances the survival of seeds entering the soil,but also greatly improves the success rate of seed germination and subsequent seedling establishment.These seed properties are highly advantageous to the renewal and reproduction of S.sareptana populations.关键词
新疆针茅/传播体/芒/吸湿性/种子萌发/幼苗出土Key words
Stipa sareptana/dispersal unit/awn/hygroscopic/seed germination/seedling emergence引用本文复制引用
郑玉琪,严佳玥,李博元,魏岩..新疆针茅传播体形态及埋深对种子萌发出苗的影响[J].草业学报,2025,34(5):64-73,10.基金项目
国家自然科学基金(31560113)资助. （31560113）
