Effects of leachates from understory medicinal plants ondecomposition of Pinus tabuliformis litter and soil enzyme activities

Authors Xu Jiyuan; Lu Yupeng; Zhang Xiaoxi; Wang Boya; Xie Bo; Liu Zengwen

Journal Journal of Northwest A & F University. Natural Science Edition , 2018,1:46

Abstract 【Objective】 The effects of leachates from understory medicinal plants on decomposition of Pinus tabuliformis litter and soil enzyme activities were investigated to provide scientific basis for selecting suitable understory species.【Method】 In this paper,and the effects of 9 leachates (water-extraction solution) from the stems and leaves of common medicinal plants (Taraxacum mongolicum,Corydalis bungeana,Mentha haplocalyx,Houttuynia cordata,Asarum sieboldii,Nepeta cataria,Lonicera japonica,Gynostemma pentaphyllum and Prunella vulgaris) in typical Pinus tabuliformis forest in Qinling Mountains on litter decomposition,nutrient releases (C,N,P,Cu,Zn and Mn) and soil enzyme activities were studied.【Result】 The leachates from Taraxacum mongolicum,Corydalis bungeana,Mentha haplocalyx,Houttuynia cordata,Lonicera japonica and Nepeta cataria had significant inhibitory effects on litter decomposition rates and release of nutrients (except L.japonica had no significant effect of N and N.cataria had no significant effect on N and P).The leachates from T.mongolicum,C.bungeana,M.haplocalyx,H.cordata and L.japonica lowered the activity of polyphenol oxidase.The leachates from L.japonica lowered activities of carboxymethyl cellulose,and N.cataria lowered activities of carboxymethyl cellulose and beta-glucosidase.【Conclusion】 A.sieboldii,G.pentaphyllum and P.vulgaris were suggested to plant under P.tabuliformis forests,where other 6 species were not suggested as understory species or their inter planting density should be diminished to avoid the inhibitory effects.

Species covered 蒲公英 Taraxacum mongolicum 荆芥 Nepeta cataria 夏枯草(变种) Prunella vulgaris 蕺菜 Houttuynia cordata 汉城细辛 Asarum sieboldii 地丁草 Corydalis bungeana 绞股蓝 Gynostemma pentaphyllum 忍冬 Lonicera japonica 薄荷 Mentha haplocalyx