【摘要】 为了解遵义烟区土壤pH的空间分布及演变特征,2016—2017年在遵义11个植烟县区采集4816个土壤样本进行pH测定,并与第二次土壤普查数据及2000—2005年调研取样数据进行对比分析。结果表明:(1)2016—2017年遵义全市烟区土壤pH变幅为4.4～8.8,平均值为6.6,变异系数为14.72%,适宜植烟pH的土壤样本占比62.5%,偏碱范围的土壤样本占比20.5%,偏酸范围的占比17.0%;(2)11个植烟县区的烟田土壤pH均值介于6.2～7.4之间,不同县区烟田土壤pH间存在显著差异(p<0.05)且各等级分布频率差异明显,总体呈现南酸北碱的空间分布格局;(3)自第二次土壤普查以来,遵义烟区在最适宜pH区间的土壤比例不断减少;在较适宜区间的土壤比例也呈现波动下降趋势;而偏碱区间的土壤比例不断增加;在偏酸区的土壤比例整体呈波动式上升趋势。总体来看,遵义烟田土壤pH具有明显的时空异质性,后续要进一步开展其演变成因与调控对策研究。更多还原

【Abstract】 In order to understand the spatial distribution and evolution characteristics of soil pH in Zunyi tobacco-growing areas,4816 soil samples were collected from 11 tobacco-growing counties in Zunyi for pH measurement in 2016-2017, and compared with the second soil survey data and the 2000-2005 survey data. The results showed that:(1) Soil pH in Zunyi tobacco areas varied from4.4 to 8.8 in 2016-2017, with an average value of 6.6 and a coefficient of variation of 14.72%. The soil samples suitable for tobacco-growing accounted for 62.5%, and the alkaline soil samples for tobacco-growing accounted for 20.5%, the proportion of acid soil samples was 17.0%;(2) The average soil pH values of 11 tobacco-growing counties ranged from 6.2 to 7.4. There were significant differences of soil pH among these counties(p<0.05) and the frequency of distribution of different soil pH grades was significantly different. The spatial distribution of soil pH showed a regional character with soils from Southern parts being acidic and from Northern parts being alkaline;(3) Since the second soil survey, the soil pH in Zunyi tobacco areas showed a decrease in the proportion of the most suitable soil pH for tobacco-growing; the proportion of suitable soil pH also showed a downward trend, while the proportion of soil in the alkaline range increased continuously and the proportion of the acid-biased soil in Zunyi tobacco areas generally increased volatility. As a whole the soil pH of Zunyi tobacco field has obvious spatial-temporal heterogeneity, and further research on its evolution causes and control strategies should be carried out in the future.更多还原