摘要
本研究以分布于青藏高原高寒草甸的17种植物种子为研究对象,研究种子大小和野外原位埋藏处理对种子萌发率和死亡率的影响,并探讨高寒生态系统植物种群的生态适应策略及其更新机制。研究结果表明:埋藏处理降低了冷地早熟禾(Poa crymophila)、短腺小米草(Euphrasia regelii)、甘肃马先蒿(Pedicularis kansuensis)、圆萼刺参(Morina chinensis)和钉柱委陵菜(Potentilla saundersiana)的种子萌发率,而增加了麻花艽(Gentiana straminea)和异针茅(Stipa aliena)的种子萌发率,显示了原位埋藏处理可以促进或打破某些物种的种子休眠;埋藏处理整体上降低了种子死亡率,尤其是麻花艽和细叶亚菊(Ajania tenuifolia),这表明埋藏处理有利于种子的存活,从而促进土壤种子库的形成;植物种子的萌发率和死亡率与种子大小无显著相关关系。综上所述,原位埋藏可以改变植物种子的休眠程度并减小种子的死亡率,是促进土壤种子库形成的潜在机制。
In this study,effects of seed size and in-situ burial on seed germination for 17 species of alpine meadow were studied,and their ecological adaptation strategies and plant population regeneration mechanism were discussed.Our results showed that:the burial treatment reduced the germination proportion of Poa crymophila,Euphrasia regelii,Pedicularis kansuensis,Morina chinensis and Potentilla saundersiana,and increased the germination proportion of Gentiana straminea and Stipa aliena,indicating that in-situ burial treatment can promote or break seed dormancy of certain species;on the whole,burial treatment reduced the seed mortality rate,especially for Gentiana straminea and Ajania tenuifolia,indicating that the burial treatment was beneficial to the survival of the seeds,and thus promoted the formation of soil seed bank;there was no significant correlation of seed mass with germination proportion and seed mortality rate.In conclusion,in-situ burial can change the degree of seed dormancy and reduce seed mortality rate,and it is a potential mechanism to promote the formation of soil seed banks.
作者
李聪
马真
武林
任彦梅
孙建平
傅延锦
孟洁
宁鑫蕊
周华坤
张春辉
LI Cong;MA Zhen;WU Lin;REN Yan-mei;SUN Jian-ping;FU Yan-jin;MENG Jie;NING Xin-rui;ZHOU Hua-kun;ZHANG Chun-hui(State Key Laboratory of Plateau Ecology and Agriculture, College of Eco-Environmental Engineering, Qinghai University, Xining, Qinghai Province 810016, China;Qinghai Provincial Key Laboratory of Restoration Ecology for Cold Regions, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, Qinghai Province 810008, China;College of agriculture and animal husbandry, Qinghai University, Xining, Qinghai Province 810016, China)
出处
《草地学报》
CAS
CSCD
北大核心
2021年第10期2169-2175,共7页
Acta Agrestia Sinica
基金
国家自然科学基金项目(31860668,32060385)
青海省科技厅项目(2020-ZJ-733)
青海大学三江源生态与高原农牧业省部共建国家重点实验室开放课题(2018-KF-01)资助。
关键词
原位埋藏
种子休眠
土壤种子库
高寒草甸
萌发率
种子死亡率
In-situ burial
Seed dormancy
Soil seed bank
Alpine meadow
Germination proportion
Seed mortality rate
