两种乔木凋落叶浸提液处理对地毯草土壤酶活性及其化学计量比的影响OA北大核心CSTPCD

Matching trees with artificial turf is a common plant configuration scheme in landscaping,but tree litter may affect the growth of understory lawn grass.The aim of this study,therefore,was to explore the allelopathic effects of litter leaf extracts of Koelreuteria paniculata and Prunus serrulata on Axonopus compressus lawn as a preliminarily investigation of the impact of understory vegetation management on the soil quality of A.compressus.Aqueous extracts of K.paniculata and P.serrulata leaf litter were prepared at mass concentrations of 10,20,and 40 g·L-1,and applied to A.compressus growing in pots.Hydrolase activity and its stoichiometric changes were determined in the rhizosphere soil of A.compressus treated with the two kinds of litter extracts.It was found that:1)As the concentration of the K.paniculata extract increased,the activities of β-1,4-glucosidase,β-N-acetylglucosaminidase,and acid phosphatase in the rhizosphere soil of A.compressus initially increased and then decreased,whereas xylase activity initially decreased,then increased,and then decreased.As the concentration of the P.serrulata extract increased,the activities of β-1,4-glucosidase,β-N-acetylglucosaminidase,and xylase in the rhizosphere soil of A.compressus initially decreased and then increased,whereas the activity of acid phosphatase continuously decreased.2)Correlation analyses showed that the activities of nitrogen-and phosphorus-acquisition enzymes were significantly positively correlated with soil organic carbon(SOC)content;Enzyme carbon∶nitrogen(C∶N)and enzyme carbon∶phosphorus(C∶P)were significantly negatively correlated with total nitrogen(TN)and total phosphorus(TP),respectively.And enzyme N∶P was significantly negatively correlated with the SOC content.The results of a vector model analysis revealed that the microorganisms in the rhizosphere soil initially had phosphorus limitation characteristics,but treatment with the P.serrulata litter leaf extract alleviated microbial C and P limitation.3)A redundancy analysis further revealed that SOC,TP content,soil C∶P,soil water content,and pH were the main factors affecting rhizosphere soil enzyme activities and the enzyme stoichiometry of A.compressus.Therefore,in daily management,leaf litter of K.paniculata and P.serrulata should be added to A.compressus turf to improve soil microbial enzyme activities and simultaneously alleviate C and P limitation.