Effects of moss on stoichiometric characteristics of soil ecology in karst urban forest

【Objective】 To explore the effects of moss on the stoichiometric characteristics of soil ecology in karst ur‐ ban forest，and to provide theoretical basis for revealing the role of moss in karst urban forest ecosystem. 【Method】 Guan‐ shanhu Park in Guanshanhu District of Guiyang City，Guizhou Province was selected as research area，6 forest species， including evergreen coniferous forest，bamboo forest，deciduous broad-leaved forest，coniferous and broad-leaved mixed forest，evergreen and deciduous broad-leaved mixed forest and evergreen shrub，were selected，moss-covered soil，bare soil and moss were collected，and the contents of carbon（C），nitrogen（N）and phosphorus（P）in soil and moss were determined，and their stoichiometric characteristics were analyzed. 【Result】 Compared with the bare soil，the N content and N∶P ratio（N∶P）in the moss-covered soil of 6 stands were significantly increased（P<0.05，the same below）. The C∶P ratio（C∶P）in moss-covered soil was significantly higher than that in bare land soil except for evergreen and deciduous broad-leaved mixed forest. Moss cover promoted soil C accumulation in 4 pure forests：evergreen coniferous forest，bamboo forest，deciduous broad-leaved forest and evergreen shrub. The contents of soil C，N and P in the moss-covered soil of bamboo forest were 99.06，0.79 and 11.79 g/kg respectively，which were higher than those of the other 5 stands，and the P content was significantly different from that of other stands. Among the different stands，the content of moss C and N was the highest（0.24 and 0.29 g/kg）in the coniferous and broad-leaved mixed forest，the content of moss P was the high‐ est（4.12 g/kg）in the evergreen coniferous forest，and the C∶N and C∶P of moss in the bamboo forest were 1.27 and 0.17 respectively，which were higher than the other 5 stands，and the difference of C∶P was significant. The results of correlation analysis showed that the content of moss N was significantly positively correlated with soil C∶N. The results of twofactor analysis of variance showed that the type of stand，moss cover or not and their interaction effects had significant in‐ fluence on the stoichiometric ratios of C，N and P of soil and moss. Redundancy analysis（RDA）revealed that the degree of canopy had significant influence on the contents and stoichiometric ratios of C，N and P of moss. 【Conclusion】 Moss has potential influence on the stoichiometric characteristics of C，N and P of soil in karst urban forest，and moss cover has positive effect on the improvement of soil N deficiency in karst area，and the soil nutrient accumulation effect of moss cover in bamboo forest is the most obvious. During forest land management and transformation，priority can be given to cultivating bamboo forests in order to give full play to the effects of moss on soil nutrient enrichment.