埋藏对65种半干旱草地植物种子萌发特性的影响

Effects of burial on seed germination characteristics of 65 plant species on Horqin semi-arid steppe

比较了半干旱草原科尔沁沙地65种植物新采种子和埋藏1年种子的萌发特性.结果表明:埋藏1年后,有38种植物的种子仍具有活力.新采种子萌发率>80%的植物种子埋藏后萌发率下降;而萌发率<80%的植物种子埋藏后萌发率均有较大幅度的提高.埋藏对种子萌发特性的影响因植物生态类群(杂草、草原植物、草甸植物、沙生植物)而异.种子埋藏1年后,多年生植物萌发率没有明显提高,而1年生植物萌发率显著提高(P<0.05).对于新采种子和埋藏1年种子萌发率间相差10%以下的物种,可根据萌发格局将植物种分为3类:埋藏促进型(如差巴嘎蒿)、埋藏抑制型(如大籽蒿)和埋藏不变型(如鹤虱).

The study on the germination characteristics of newly collected and one year-buried seeds of 65 plant species on Horqin semi-arid steppe showed that after one year＇ s burial, the seeds of 38 plant species still remained their vitality. For the species whose freshly collected seeds had a germination rate higher than 80%, the seed germination rate after burial was decreased, while it was in adverse for those whose freshly collected seeds had a germination rate less than 80%. The effects of burial on seed germination varied with the ecological types of the species （i. e. , weed, steppe species, meadow species, and psammophytes）. After one year＇ s burial, the germination rate of perennials had no significant increase, but that of annuals increased significantly （ P 〈 0.05）. The species with a 〈 10% difference of germination rate between their freshly collected and one year-buried seeds could be classified into three categories, according to the seed germination pattern, i. e. , germination was promoted by burial （e. g. Artemisia halodendron ） , restrained by burial （e. g. A. sieversiana ） ; and unchanged after burial （e. g. Lappula myosotis ） .