从形态学特征和腐殖质组分谈内蒙古黑垆土的演化

黑垆土作为１个独立的土类，在内蒙古自治区南部温带地区分布有其特殊意义。该土类的形态学特征是具有深厚的暗褐色的腐殖质层，耕作层较黄土高原的黑垆土薄，无古老的耕作层；土体中有碳酸盐假菌丝状新生体、碳酸盐含量较低在１％上下。腐殖质含量较低在１％～３％，胡敏酸和富里酸比值在剖面中下部达到２以上，胡敏素相对含量较低，一般不超５０％。该区域分布的黑垆土是温带草甸草原黑钙土演变的结果。

EVOLUTION OF HEILU SOIL IN INNER MONGOKIA REGION FROM MORPHOLOGY CHARACTERISTICS AND HUMUS

The HeiLu soil which distrubuted in the southern warm zone of Inner Mongolia Autonomous Region has special significance as an independent soil type. The Morphology Characteristics of Hei Lu soil are deep and dark horizon of humus.Compared with the one of the loess plateau, it was shallower in tilled horizon and no aqe-old tilled soil.In this soil CaCO 3 pseudomycelium, the content of carbonic acid salts was low, about 1%;the content of soil humus was low,1% to 3%;the ratio of humic acid and fulvic acid (HA/FA) was up to 2 in the middle part of the soil profile;the content of humin was relatively lower,about 15% to 35% a few of them up to 50%. The HeiLu soil in this region evoluted from chernozem of moderate belt and meadow steppe.