Evans Ceri E, Etherington John R
School of Pure and Applied Biology, University of Wales, PO Box 915, Cardiff, CF1 3TL.
New Phytol. 1990 Jul;115(3):539-548. doi: 10.1111/j.1469-8137.1990.tb00482.x.
'Seeds' of 15 species collected from a range of habitats contrasting in soil water status were germinated in soils of known matric potentials ranging from near field capacity to the permanent wilting potential (- 0.05, -0.5, -1.0 and -1.5 MPa). Germination was very sensitive to soil water potential and species responded in various ways. Some showed germination responses which correlated with the soil water status of their native habitat: none of the wetland species studied could germinate to any great extent at low soil water potentials; in contrast some species associated with drier habitats achieved high levels of germination in soils as dry as -1.0 MPa (and -1.5 MPa for one ruderal species). However, other species from drier habitats failed to germinate at low soil water potentials, and it is suggested that this may be a mechanism to avoid exposing the seedling to an unfavourable environment.
从一系列土壤水分状况不同的栖息地收集的15个物种的“种子”，在已知基质势范围从接近田间持水量到永久凋萎点（-0.05、-0.5、-1.0和-1.5兆帕）的土壤中萌发。萌发对土壤水势非常敏感，且物种有不同的反应方式。一些物种的萌发反应与它们原生栖息地的土壤水分状况相关：所研究的湿地物种在低土壤水势下均不能大量萌发；相反，一些与较干燥栖息地相关的物种在低至-1.0兆帕的干燥土壤中（一种杂草物种在-1.5兆帕时）能达到高萌发率。然而，其他来自较干燥栖息地的物种在低土壤水势下不能萌发，有人认为这可能是一种避免使幼苗暴露于不利环境的机制。
