本文对黄河、长江、珠江三角洲土壤中5种微量元素的形态分配及其地理分布趋势进行了研究。
The partitioning and regional distribution of 5 trace elements in soils from Yellow River, Yangtze River and Pearl River Deltas were studied.
河流的出口是河流进入海洋的地方。大多数的河流在出口处变得非常宽阔，土壤在那儿沉积，形成三角洲。
The river's mouth is the place where a river goes into the ocean. Most rivers become very wide at their mouths, forming deltas from soil deposited there.
黄河三角洲是海陆交互作用形成的退海地，土壤形成时间相对较短，地面植被演替频繁，整个生态系统比较脆弱。
Yellow river Delta is the retired land formed from the river-sea interaction, the soil formed shortly, and the vegetation evolves frequently, the whole ecosystem is vulnerable, too.
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