生物炭对关中塿土不同形态钾素含量的影响

Effect of Biochar on Different Potassium Forms in Guanzhong Lou Soil

为了解生物炭影响土壤肥力的机理,通过盆栽实验,设置6个生物炭水平(0、10、30、50、70、90 t/hm^(2)),测试塿土4个钾离子指标:水溶性钾离子、交换性钾离子、速效钾、全钾含量。结果表明,在塿土中添加生物炭后,土壤水溶性钾、速效钾、交换性钾离子含量与生物炭添加量之间呈现y=aebx指数关系,土壤pH和土壤速效钾、交换性钾离子含量显著相关,与水溶性钾离子、全钾含量无显著相关关系。在关中塿土中添加生物炭,可以显著提升土壤速效钾、水溶性钾、交换性钾离子含量。考虑到土壤钾离子、酸碱度、经济因素,提前30天,在塿土中施入50 t/hm^(2)生物炭效果最好。

In order to understand the mechanism of biochar affecting soil fertility, six biochar levels, 0, 10, 30, 50,70 and 90 t/ha were set up in pot experiment, and four potassium indexes of Lou soil were tested by flame photometer: water soluble potassium, exchangeable potassium, available potassium and total potassium. The results showed that: after biochar was added to Lou soil, the contents of water-soluble potassium, available potassium, exchangeable potassium and biochar showed an y=aebx index relationship, and soil pH was significantly correlated with the contents of available potassium and exchangeable potassium, but not with the contents of water-soluble potassium and total potassium. Adding biochar to Guanzhong Lou soil can significantly increase the content of soil available potassium, water-soluble potassium and exchangeable potassium. Taking into account the potassium ion, pH and economic factors, 50 t/ha biochar was applied 30 days in advance in Lou soil is the best.