圩田是长江下游地区在土地开发过程中采取的重要土地利用形式。
Polders, as a special form to utilize land, came into being in process of cultivation for farmlands.
下蜀土较强的化学风化过程可能受长江下游地区较强的季风性气候控制。
Strong chemical weathering underwent by the Xiashu loess might be related to strong monsoon climate in the lower reaches of the Changjiang River.
目的阐明长江下游地区钉螺再次迁入无螺江滩后的钉螺消长和分布变迁规律。
Objectives to understand the fluctuation and distribution pattern of Oncomelania snails after migrated into marshland where no snail infested.
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