白浆土腐殖质的光谱吸收特性

VISIBLE AND INFRARED SPECTRA OF THE HUMIC SUBSTANCES EXTRACTED FROM CULTIVATED ALBIC BLEACHED SOILS

岗地白浆土中胡敏酸的E_(465)和 E_(665)值都高于平地白浆土。草甸土和暗棕壤的 E_(465)和 E_(665)值都比耕地白浆土的值低。各种土壤胡敏酸的红外光谱吸收差异,主要是在3300～2600cm^(-1)范围内。对胡敏酸的红外光谱图分类,确定暗棕壤胡敏酸属 A 型、草甸土胡敏酸属 Rp 型,耕地白浆土胡敏酸则和 P 型相似,分别处于腐殖质的不同转化阶段。

The E465and E665values,which have significant relationship with the COOH contents and C/H ratios,of the humic acids from all cultivated aldic bleached soils are higher than that from virgin meadow soil and dark brown forest soils.The effects of cultivation and relief on the humic sudstances of albic bleached soils are also indicated by their visible and i.r.spectra.The i. r.spectra of humic acids from three types of soil differ mainly in the region of 3300～2350cm-1.They are shown that the humic acids from dark brown forest soils belonging to Type A,from virgin meadow soil belonging to Type Rp, and from cultivated atbic bleached soils resembling Type P,all of which repre- sent th varying stages of soil humification.