白浆土腐殖质的提取和分组特性

EXTRACTION AND FRACTIONATION OF THE HUMIC SUBSTANCES FROM CULTIVATED ALBIC BLEACHED SOILS

通过对耕地白浆土与草甸土、暗棕壤的 C/N 比,腐殖质含量和分组组分的比较分析,发现耕地白浆与相邻的草甸土、暗棕壤有较大的差异。开垦耕作使白浆土的有机质含量及各组分、全氮量、HA/FA 值下降。耕作熟化过程伴随着腐殖质组分间的转化。

There are some differences of humic substances between cultira- ted albic bleached soils,virgin meadow soils and dark brown forest soils in their C/N and HA-C/FA-C ratios.The cultivation practice decreased the amounts of tobal organic matters,total nitrogen and HA-C/FA-C ratios with the cropping time increasing,and also transferred one fraction of humus into another by interfering in the pathway of formation of humic substances in cultivated albic bleached soils.