The effects of vegetation type on soil nutrients and enzymes in Jiangjia Gulley with frequent debris flow
Plant community structure,soil nutrients and soil enzyme activity have a coupling relationship in relation to the vegetation types.This research aimed to find the relationship between structure of plant community and soil nutrients and enzymes in an area with frequent debris flow.We took as the main research object of 5 typical vegetation types in the Jiangjia Gulley including Heteropogon contortus,Salix myrtillacea and Leucaena leucocephala of 9 years,15 years and 26 years.We analyzed the characteristics and correlation of plant diversity with soil nutrients and soil enzyme activity by methods of field investigation and laboratory analysis.The results showed a sequence of plant diversity as Salix myrtillacea ＞ Heteropogon contortus ＞ 26-year Leucaena leucocephala ＞ 15-year Leucaena leucocephala ＞ 9-year Leucaena leucocephala.The contents of the soil organic matter,the C∶N and C∶P were all higher in Heteropogon contortus and Salix myrtillacea than in Leucaena leucocephala of all three ages (P ＜ 0.05).The Simpson and Shannon-Wiener plant diversity indices showed a significant positive correlation with soil organic matter and Invertase (P ＜ 0.05).Finally,the organic matter showed an extremely significant positive correlation with Invertase (P ＜ 0.01).The results indicated that higher plant diversity index in different vegetation communities can help the accumulation of soil fertility and can improve soil biological activity in areas with frequent debris flow.
areas of debris flowplant diversitysoil organic mattersoil invertase activity
NETL
NSTL
万方数据
维普
