摩天岭北坡中段不同海拔梯度草本植物多样性生态系统功能分析

试验以摩天岭北坡中段寨科桥和邱家坝林下草本群落为研究对象,探讨了其群落特征及其与土壤养分含量的关系,结果表明:(1)样地共出现34科53属57种草本植物,其中,菊科、唇形科和毛茛科的草本植物较多;(2)草本层地上、地下生物量随海拔的升高逐渐降低,与海拔梯度相关性均不显著(P0.05);(3)草本层盖度、物种丰富度、土壤有机碳含量、土壤全氮含量与海拔相关性均不显著(P0.05),土壤磷含量与海拔存在极显著正相关(P0.01),且盖度、物种丰富度与土壤有机碳、全氮、全磷含量的相关性均不显著(P0.05);(4)草本层地上、地下生物量均与盖度显著正相关(P0.05),与物种丰富度不存在显著相关性(P0.05),地上生物量与土壤全氮含量呈极显著负相关(P0.01),地下生物量与土壤有机碳含量呈极显著正相关(P0.01)。相比之下,土壤有机碳和全氮含量对草本群落地上、地下生物量的影响更显著,且盖度和全氮对地上生物量的影响存在微弱的相互抑制作用,盖度和有机碳对地下生物量的影响存在促进作用。

Ecosystem function analysis of herbaceous diversity at different altitude gradients in the middle section of north-facing slope on Motianling Mountain

The community characteristics of the understory herbaceous in Zhaikeqiao and Qiujiaba located in the middle section of north-facing slope of Motianling Mountain were studied,and the relationship between the community characteristics and the soil nutrient content were analyzed.The result showed that there were 5 7 species of herbaceous plants belonging to 53 genera and 34 families,and most of them were from Compositae, Labiatae and Ranunculaceae.The aboveground and underground biomass of herbaceous layer decreased gradual-ly with the increasing of altitude,and the correlation with elevation gradient was not significant (P>0.05).The altitude did not show significant correlation relationship with the coverage of herbaceous layer,species richness, soil organic carbon content and total soil nitrogen content (P>0.05).And there was a significant positive corre-lation between soil phosphorus content and altitude (P<0.01),and the correlation of coverage,species richness to soil organic carbon,total nitrogen and total phosphorus content was not significant (P>0.05).In addition, there was significant positive correlation between the aboveground and subsurface biomass (P<0.05),and there was no significant correlation with the species richness (P>0.05).The aboveground biomass was negatively correlated with the total soil nitrogen content (P<0.01),and the underground biomass and soil organic carbon content had a positive correlation (P<0.01).In contrast,the soil organic carbon and total nitrogen content had significant effect on the aboveground and underground biomass,and the coverage and total nitrogen had weak in-hibition effect on the aboveground biomass,and the coverage and organic carbon had promoting effect on the un-derground biomass.It could be concluded that the biomass of herbaceous community was not affected by single factor,and the species diversity,soil nutrient and climate factors should be considered as well.