荣威550仪表拆卸:求助高手翻译（生态类）

这是最后两段，
The properties of the plant species and their populations may also affect the strength of mass effects. The probability of a plant species successfully invading a neighboring plot should depend, to some extent, on the number of its propagules that arrive there. This suggests that common species and species with high per capita seed production should be more capable of supporting sink populations in otherwise inhospitable plots than their rarer or less fecund counterparts. Interspecific differences in seed dispersal properties should also be important, because widely dispersed propagules are more likely to cross environmental boundaries than are poorly dispersed ones. These three predictions, all of which concern properties affecting the rain of propagules into sink habitats, will be referred to collectively as the Propagule Density Hypothesis.
In this paper, I report the results of surveys along transects across the treatment borders separating the Rothamsted Park Grass experimental subplots. If mass effects are important in maintaining grassland plant diversity, the species richness of those samples should be inversely related to their distance from interplot boundaries. The strength of these effects will then be discussed relative to the nature of the plots involved and the species they contain.
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只求大概意思，不要求逐字翻译，谢谢！！！