Effects of Different Types of Biochar on Substrate Nutrients and Enzyme Activities of Acer truncatum Seedlings
In order to explore the effects of adding different types and amounts of biochar on the nutrients and en-zyme activities of Acer truncatum seedling substrate,the optimal charcoal application amount of Acer truncatum seed-ling substrate was screened,which provided a theoretical reference for the scientific application of biochar in Acer truncatum seedling substrate.In this study,Acer truncatum seedlings were used as experimental objects,used pot ex-periment,bamboo charcoal,rubber charcoal,rice hull charcoal and their application doses(3％,5％,7％)were used in 11 treatments,determined of matrix nutrients and enzyme activity,correlation analysis and path analysis were used to explore the relationship between matrix nutrients and enzyme activity,cluster analysis was used to ex-plore the optimal amount of biochar application.The results showed:the addition of different biochars could in-creased the nutrient content and enzyme activity of the substrate to a certain extent,the pH range was 6.89-7.21,the total nitrogen,total phosphorus and total potassium content increased by 6.25％-76.38％,4.08％-414.29％and 41.86％-111.81％respectively,and the hydrolyzable nitrogen,effective phosphorus and quick-acting potassi-um content increased by 8.56％-56.66％,33.67％-576.53％and 26.11％-58.16％,and there was a significant correlation between matrix nutrients and enzyme activity.Compared with bamboo charcoal and rubber charcoal,rice hull charcoal had better effects on pH,organic carbon,total nitrogen,hydrolytic nitrogen,and urease,catalase and sucrase activities.The results of redundancy analysis and path analysis show that,hydrolytic nitrogen and pH were the major nutrient factors which affect enzyme activity,among them,available potassium and total nitrogen were the most important factors affecting urease,total nitrogen and pH were the most important factors affecting Catalase,total potassium and hydrolytic nitrogen were the most important factors affecting sucrase.Cluster analysis showed that DK7％treatment had a significant effect on the increased of nutrient content and enzyme activity of the substrate,which belonged to higher fertility level.In general,the addition of biochar to Acer truncatum seedlings in a short pe-riod of time had a certain effect on the substrate nutrients and enzyme activities,it is suggested that 7％rice husk charcoal should be preferentially selected when adding biochar to Acer truncatum seedling substrate.
万方数据
维普
