Abstract:

To study the composition characteristics of soil humus in Yunnan Golden Corridor tobacco-growing areas and its relationship with the physiochemical characteristics of soil, 58 soil samples in 10 cities of Yunnan Gold Corridor tobacco-growing areas were analyzed by cluster analysis, correlation analysis and other statistical methods. The results showed that: ① Carbon content of humus (Hu-C) in Yunnan Gold Corridor tobacco-growing areas was 15.97 g/kg in average, fulvic acid carbon content (FA-C)，humic acid carbon content (HA-C) and humin carbon content (HM-C) were 3.45 g/kg, 1.72 g/kg and 10.80 g/kg, respectively. HA/FA ratios ranged from 0.19 to 2.06, with the average of 0.54, and the humification degree of humus was relatively low. ② In the 10 cities of Yunnan Golden Corridor tobacco-growing areas, the overall performance of the content of carbon and components in soil humus was higher in Honghe, Chuxiong, Baoshan and Wenshan. ③ The Hu-C of purple soil was significantly lower in four soil types, and other soil types were as follows: paddy soil> red soil> alluvial soil; HA/FA ratio was all less than 1 in four soil types, and it was as follows: alluvial soil > purplish soil> paddy soil> red soil. ④ The Hu-C was significantly negatively correlated with the content of soil sand and coarse dust, but significantly positively correlated with the content of fine clay and cation exchange capacity, the composition of soil humus was negatively correlated with the pH of soil.

Key words: Yunnan Golden Corridor tobacco-growing areas, humus, soil type, cation exchange capacity

摘要：

为研究云南黄金走廊烟区土壤腐殖质组成特征及其与土壤理化性状的关系，采用聚类分析和相关分析等方法对云南黄金走廊烟区10个植烟市58份土壤样品进行分析。结果表明：①云南黄金走廊烟区土壤腐殖质碳量均值为15.97 g/kg，富里酸碳量、胡敏酸碳量和胡敏素碳量分别为3.45 g/kg、1.72 g/kg和10.80 g/kg；土壤胡富比在0.19~2.06之间，均值为0.54，腐殖质的腐殖化程度相对较低；②云南黄金走廊烟区10个植烟市中土壤腐殖质碳量及其组分含量以红河、楚雄、宝山和文山地区较高；③不同土壤类型间腐殖质碳含量以紫色土显著较低，其他表现为水稻土>红壤>新积土；四种类型土壤胡富比均小于1，依次为新积土>紫色土>水稻土>红壤；④土壤腐殖质碳量与土壤砂粒和粗粉粒含量呈显著性负相关，与细粘粒含量和阳离子交换量存在显著性正相关，土壤腐殖质组成与土壤pH整体呈负相关关系。

关键词: 云南黄金走廊烟区, 腐殖质, 土壤类型, 阳离子交换量