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Spatial pattern and utility of populus euphratica seed rain:a simulation study combined with field investigations

forestry Studies in China 2012年第3期14卷 169-179页

作者： HAO Peng LI Jing-wen ZHOU Wei-lei LIU Qian-wen ZHANG Yu-bo Key Laboratory for Silviculture and Conservation of the Ministry of Education Beijing Forestry UniversityBeijing 100083E R.China Inner Mongolia Research Academy of Environmental Sciences Hohhot 010011P.R.China

Seed dispersal is a fundamental process affecting destinies of seeds and seedlings, as well as regeneration dynamics and distribution patterns of communities. Recently however, declining populus euphratica forests have failed to regenerate by seeding, while the spatial pattern and utility of their seed rains are unclear. In this study, we designed a model to simulate seed rains based on field investigations by fitting our observations to a normal distribution and testing the model with data from three years, with ac- ceptable results. We examined the simulated results of dispersed seeds patterns on the classification of three factors, i.e., density of Sophora alopecuroides, surface soil moisture and surface soil salinity. The results of seed rain simulation show that over 70% of seeds were dispersed and confined to each of the three plots where their mother trees located. The proportion of 3：7 seeds dispersed inside and outside each plots remained largely unaltered. The differences in the amounts of dispersed seed among the different levels of each of the factors were not significant, although the distributing pattern of P. euphratica in each plot varied. Therefore, in P. eu- phratica communities, the amount of seed does not become a constraint in subsequent germination, although the surface environment does. We conclude that successful P. euphratica seed regeneration relies on less than 30% of seeds dispersed over longer distance to colonize favorable growth habitats.

关键词： populus euphratica forest seed rain spatial pattern utility wind direction

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