生态环境学报Issue(2)：224-230,7.DOI:10.16258/j.cnki.1674-5906.2015.02.007
四种豆科牧草种子萌发和幼苗生长对干旱的响应及抗旱性评价
Four Legumes Response to Simulated Drought in the Stages of Seed Germination and Seedling Growth and Drought Resistance Assessment
摘要
Abstract
The adaption ability of forage seed to meet adversity between germination and seedling stage is key factor to determine the distribution of grassland population and continuation in arid areas. The objective of on comprehensive evaluation of forage seeds drought resistance was to provide support for water regulation and seedling maintenance at natural grassland reseeding, artificial rangeland establishing and mine vegetation restoration in arid and semiarid regions. The study adopted different osmotic potential using Polyethylene glycol (PEG-6000) solution simulated drought conditions in Erdos drought-area steppe, The seed germination, seedling growth and drought resistance assessment of four common legumes that usually used as reseeding or seeding establishment forage, Caragana stenophylla Pojark., Melilotus suavelens Ledeb., Medicago sativa L.cv. Neimeng Zhungeer and Astragalus adsurgens Pall.cv Shadawang were studied. The results showed that slight drought (-0.05 MPa~-0.2 MPa) had a promoting effect on the seed germination of 4 legumes. Except for M. sativa L.cv. Neimeng Zhungeer the simulated drought promoted the seedling root growth and increased the ratio of seedling root:shoot. The relative vitality index was higher for C. stenophylla Pojark and A adsurgens Pall. cv .Shadawang than other forage, but the germination of drought resistance was the lowest for C. stenophylla Pojark in moderate drought condition (-0.4 Mpa~-0.6 MPa). M. sativa L.cv.Neimeng Zhungeer had the highest relative germination indexes in the heavy drought condition (≤-0.8 MPa). Using the comprehensive evaluation of fuzzy membership function method, the drought resistances of the four legumes under seed germination stage ranked M. sativa L.cv. Neimeng Zhungeer > A. adsurgens Pall. cv .Shadawang>M. suavelens Ledeb.>C.stenophylla Pojark, in the seedling growth stage ranked M. suavelens Ledeb.>M. sativa L.cv. Neimeng Zhungeer>C. stenophylla Pojark>A.adsurgens Pall. cv .Shadawang. and the comprehensive assessment rank was M. suavelens Ledeb.>M. sativa L.cv. Neimeng Zhungeer>A.adsurgens Pall. cv .Shadawang>C. stenophylla Pojark.关键词
豆科牧草/聚乙二醇/模拟干旱/种子萌发/幼苗生长/隶属函数法/抗旱性Key words
Legumes/Polyethylene glycol/simulated drought/seed germination/seedling growth/membership function/drought resistance分类
农业科技引用本文复制引用
罗冬,王明玖,李元恒,陈海军,杨勇..四种豆科牧草种子萌发和幼苗生长对干旱的响应及抗旱性评价[J].生态环境学报,2015,(2):224-230,7.基金项目
内蒙古科技创计划项目（20140701）；公益性行业（农业）科研专项 （）
