关键词: 云南黄金走廊烟区, 腐殖质, 土壤类型, 阳离子交换量

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