river-net density 河网密度
Sediment density is one of main physical characteristics of river sediment.
泥沙密度是河流泥沙的主要物理特性之一。
The density distribution and main mineral composition of the deposit in the Yangtze River at Fuling area are analysed.
本文介绍了长江涪陵段沉积物的密度分布及主要矿物组成；
The distribution of bio-mass and density is extremely uneven, but both of high biomass and high density were basically similar, in the area northen to Changjiang River estuary.
生物量和栖息密度的分布极不均匀，高生物量和高栖息密度的分布趋势基本相似，两者都在调查区的北部。
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