对渤、黄海近岸海域底栖生物的种类组成、生物量及栖息密度的分布和群落结构进行了叙述和讨论。
The distribution of benthic biomass and biodensity, composition of species and community structure are studied in coastal waters of the Bohai and Yellow Seas.
此外，种类组成、生物量和群落结构指数都随纬度和潮汛的不同而变化。
In addition, the composition of species, Numbers and the index of community structures were changed with latitude and spring tide.
内容包括造林密度与树冠结构、造林密度与林木生长特性、造林密度与生物量等关系的研究。
The studied items include the relationship between planting density and crown structure, planting density and growth characteristics, planting density and biomass etc.
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