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中部平原的多年生牧草优势种——格兰马草(Boutelona gracilis(H.B.K.)Iag.ex Stend.)的种子,在半干旱的、破坏的土地上,一般不能复生(Bement等,1965;Hyder等,1971)。幼苗的死亡归因于不定根发育不良而不能伸入潮湿的土壤(Wilson and Briske,1979)。对于根系发育的必要条件,应该包括温暖的土壤温度、潮湿的土壤剖面以及3—4天连续潮湿的土壤表面。没有发育不定根的幼苗,在干旱或者低温期间不能成活。
The seeds of Boutelona gracilis (HBK) Iag. Ex Stend., A perennial pasture dominant species in the Central Plains, are generally not regenerated on semi-arid, destroyed land (Bement et al., 1965; Hyder et al. 1971). The death of seedlings is attributed to adventitious root development and inability to reach moist soil (Wilson and Briske, 1979). The conditions necessary for root development should include warm soil temperature, wet soil profiles, and 3-4 days continuous wet soil surface. Seedlings that do not develop adventitious roots can not survive drought or cold.