3种绿肥对茶园土壤pH值和交换性阳离子含量的影响

Effects of three green manures on soil pH and exchangeable cation content in tea garden

[目的]探讨种植马唐、白三叶草、油菜花等3种绿肥对茶园土壤pH值和交换性阳离子含量的影响。[方法]采用盆栽试验。[结果]随着植物的生长,茶园土壤酸化得到缓解。处理407d后,与空白处理(CK)相比,种植马唐、白三叶草、油菜花的茶园土壤pH值分别提高了0.15、0.46、0.26;交换性酸总量分别降低了0.70、1.57、1.16cmol·kg^-1,其中Al^3+含量分别降低了0.66、1.52、1.08cmol·kg^-1;交换性盐基总量分别提高了0.44、2.29、1.54cmol·kg^-1。相关分析表明,种植马唐、白三叶草、油菜花后,茶园土壤pH值与交换性酸总量、交换性酸总量与交换性盐基总量之间均存在负相关关系。其中,种植油菜花后茶园土壤交换性酸总量与交换性盐基总量之间的相关系数为-0.811,达极显著水平。[结论]种植这3种绿肥不仅能降低茶园土壤活性酸含量,还能减少其潜在酸含量,从而缓解茶园土壤酸化。

[Purpose]Investigate the effects of three green manures,namely,weeds(Digitaria sanguinalis),white clover(Trifolium repens),and rape flower(Brassica campestris)on soil pH and exchangeable cation content in tea garden.[Method]A pot experiment.[Result]The results showed that the acidification of tea garden soil was alleviated with the growth of plants.After treatment for 407 days,compared with no treatment(CK),the soil pH value of tea plantations of weeds,white clover and rape flower increased by 0.15,0.46 and 0.26 units,respectively.The total exchangeable acid contents decreased by 0.70,1.57,1.16 cmol·kg^-1,the aluminum ion contents decreased by 0.66,1.52 and 1.08 cmol·kg^-1,respectively.The total exchangeable base ions(K^+,Na^+,Ca^2+,Mg^2+)increased by 0.44,2.29 and 1.54 cmol·kg^-1 respectively.Correlation analysis showed that there was a negative correlation between soil pH value and total exchangeable acid,total exchangeable acid and total exchangeable base in tea garden after planting these three kinds of plants.The correlation coefficient between total amount of exchangeable acids and total exchangeable salt base was-0.811 in tea garden soil after planting rape flower,which was extremely significant.[Conclusion]The planting of these three kinds of green manures could not only reduce the active acid content in tea garden soil,but also reduce its potential acid content,thereby alleviating the soil acidification in tea gardens.