残余土壤 英文：relict soil 释文：具有两种以上环境特征的地表古土壤。其发育过程中,虽未被覆盖,但地表成土环境已变,仍保留着过去环境中的性状,如高山或高纬地区的古红土、干旱地区的残余盐土、残余沼泽土都是。这种土壤是研究环境变化的重要信息载体
结果表明：木质素对土壤残余磷具有明显的释放作用。
The results showed that lignin could help liberate the residual phosphate in soil.
木质素用量越大，土壤粘粒越多，残余磷含量越高，木质素释放残余磷的数量越多。
The released quantity of residual phosphate was opositively related to the content of clay and residual phosphate in soil, and the concentration of lignin in the extracting solution.
中国古土壤现分为埋藏土和残余土两大类。
Paleosols of China are divided into buried and relict soils.
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