摘要
综合研究了陇东黄土高原黑垆土不同烟草种植年限土壤的有机质含量、腐殖质组成、形态及胡敏酸的色调系数、相对色度等,结果表明：30～70 cm土层土壤有机质含量演化随烟草种植年限的增加表现出降低的特征最为明显,土壤表层的有机碳与胡敏酸含量则呈正相关,连作23年的胡敏酸最低。烟草连作1～8年的土壤HA/FA比值均大于1,0～30 cm土层HA/FA比值为1年烟草〉5年烟草〉农田〉8年烟草〉23年烟草。农田和种植烟草1年的表层腐殖质含量以松结态〉稳结态,连作5年至23年表层腐殖质含量则为稳结态〉松结态。烟草连作各层土壤的相对色度（RF）在0～30 cm,50～70 cm土层随烟草连作年限呈显著的降低趋势,30～50 cm土层种植烟草1～8年呈升高趋势,8年后则呈降低趋势。但各层总趋势基本呈0～30 cm〈30～50 cm〈50～70 cm。HA的色调系数（ΔlogK）30～50 cm变化较小,各土层变化趋势与RF相反但结果一致。与对照比较,烟草连作1～8年可提高或保持胡敏酸氧化和芳化程度。
This paper studied the optics character of organic matter content,composition and form of humus and the RF,ΔlogK of humic acid at different planting age of Heilu soil in Longdong loess plateau.The result shows that： As the age increased,the organic matter content of the tobacco soil,which should be the depth between 30 cm to 70 cm,will reduced most obviously,but the organic carbon and humic acid of surface soil has a positive relationship,the age of continuous cultivation of 23 years has a lowest content of humic acid.The HA/FA of the age of continuous cultivation of 8 years is more than 1,the rate of HA/FA,which should be the depth between 0 cm to 30 cm,would be： tobacco soil of one year 〉tobacco soil of 5 years〉farmland 〉 tobacco soil of 8 years 〉tobacco soil of 23 years,the humus content of farmland and tobacco of one year soil would be： loose 〉 stabic,but the age of continuous cultivation of 5 years to 23 years,the humus content would be stabic 〉 loose.The trend of the change of field of relative color degree at the depth of 0 to 30 cm and 50 cm to 70 cm shows that as the time of continuous cropping of tobacco improved,the RF will be reduced,at the depth of 30 cm to 50 cm of the tobacco field for the time of continuous cropping about 1 to 8 years will be improved,after this it will reduced.But the total tendency just like this： 0～30 cm〈30～50 cm〈50～70 cm.The change of the parameter of color zone of HA（ΔlogK） at the depth of 30 cm to 50 cm has just a little changes besides,the tendency of each field layer has a close relationship with opposite RF.Comparing the standard,the time of continuous cropping of tobacco during 1 to 8 years will improved the degree oxidation and differentiation.
出处
《水土保持学报》
CSCD
北大核心
2007年第6期126-129,共4页
Journal of Soil and Water Conservation
基金
陇东学院科学研究资助项目(XYZK0508)
