Effects of sugarcane/peanut intercropping on root physiology and rhizosphere soil nutrients
In order to explore the root physiology and rhizosphere soil nutrients under the sugarcane peanut in-tercropping,three cropping modes were set up for sugarcane monocropping,peanut monocropping,and intercrop-ping of sugarcane and peanut.The changes of root exudates,root extracts and rhizosphere soil nutrients under differ-ent cropping modes and their correlations were systematically analyzed.The results showed that the total amino acid in intercropping sugarcane root exudates and the total sugar in intercropping sugarcane root extract were significant-ly higher than that of monocropping sugarcane,while only the total sugar in intercropping peanut root extract was significantly higher than that in monocropping peanut.The alkali-hydrolyzed nitrogen,available phosphorus,avail-able potassium,and soil organic matter in the rhizosphere soil of intercropping sugarcane were significantly higher than those of monocropping sugarcane,while the available phosphorus and available potassium and pH in the rhizo-sphere soil of intercropping peanut were significantly lower than those of monocropping peanut.There was no signifi-cant different in acid phosphatase,catalase,urease,and saccharase between intercropping and monocropping sugar-cane,while the catalase of rhizosphere soil in intercropping peanut was significantly higher than monocropping pea-nut.There was a significant negative correlation between phenolic acids in root exudates and soil organic matter,while a significant positive correlation between total sugar content and sucrase,and a significant positive correlation between amino acids and urease.Organic acids in root extracts were positively correlated with pH,while amino ac-ids were negatively correlated with soil organic matter while highly negatively correlated with available potassium.Urease was negatively correlated with AK,and sucrase was highly negatively correlated with soil organic matter.In conclusion,sugarcane/peanut intercropping system mainly affected the metabolic activity of root secreted amino ac-ids,total sugars,and phenolic acids.And intercropping can significantly increase the soil available nutrients of in-tercropping sugarcane.
万方数据
维普
