This demonstrated deteriorating regeneration conditions and decreasing ability of spatial occupation of P. massoniana with succession—that P. massoniana had a declining population.
在群落的演替过程中，马尾松种群的空间占据能力不断下降，种群呈衰退趋势。
This paper discusses the purpose, index, engine, technical essentials, regeneration of database and management in safety related to spatial database construction in details.
文章详细论述了空间数据库的建设目标、技术指数、空间数据库引擎以及数据库建设的技术要点、数据库的更新、安全管理等，并进行了讨论。
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