摘要
本文研究了我国南方三种酸性土壤（红壤、赤红壤和砖红壤）在去除铝键结合腐殖质和铁键结合腐殖质前后土壤微团聚体组成及腐殖质氧化稳定性的变化。结果表明：在以０．５ｍｏｌ·Ｌ－１ＮＨ４Ｆ（ｐＨ８．２）除去部分铝键结合腐殖质后，三种土壤的微团聚体组成中以５～１０μｍ粒级的变化最大，其中在红壤中该级数量急剧减少，小于５μｍ微团聚体增加；再以０．１ｍｏｌ·Ｌ－１Ｎａ４Ｐ２Ｏ７＋０．１ｍｏｌ·Ｌ－１ＮａＯＨ（ｐＨ１３）混合液处理后，赤红壤和砖红壤中５０～２５０μｍ微团聚体数量大幅降低，５～１０μｍ微团聚体则增加。在以ＮＨ４Ｆ除去部分铝键结合腐殖质后，残留于土壤中的腐殖质的氧化稳定性均略有增加，但幅度较小；继续以０．１ｍｏｌ·Ｌ－１Ｎａ４Ｐ２Ｏ７＋０．１ｍｏｌ·Ｌ－１ＮａＯＨ（ｐＨ１３）混合液进一步除去铁铝键复合体后，氧化稳定性则基本保持不变；
Three kinds of acid red soils were used to study the effects of organo mineral interactions on the composition of soil microaggregates and oxidation stability of humus.The results showed:The content of 5～10μm microaggregates decreased significantly and the amount of < 5μm microaggregates inceased after removal of Al bound humus by 0.5mol·L -1 NH 4F(pH8.2)in red soil.The microaggregate composition would be further changed after successive removal of the bound humus by 0.1mol·L -1 Na 4P 2O 7+0.1mol·L -1 NaOH(pH13),among which the content of 50～250μm microaggregates decreased significantly ,and the amount of<5～10μm microaggregates increased in Lateritic red earth and Latosol. The oxidation stability (Kos)of humus tended to increase slightly after removal of Al bound humus by 0.5mol·L -1 NH 4F(pH8.2),whereas it almost kept constant after further removal of bound humus by 0.1mol·L -1 Na 4P 2O 7+0.1mol·L -1 NaOH(pH13).The oxidation stability of the three tested soils were in the following order:red soil>Lateritic red earth>Latosol.
出处
《浙江农业学报》
CSCD
1998年第4期197-200,共4页
Acta Agriculturae Zhejiangensis
基金
浙江省自然科学基金
关键词
微团聚体
氧化稳定性
红壤
腐殖质
有无机复合
organo mineral interaction
microaggregate
oxidation stability
red earth
