岩溶地区森林自然恢复过程中植物和土壤微生物多样性的关联分析

本研究以岩溶地区森林自然恢复过程中的草丛(HL)、灌丛(SL)、灌乔林(SAF)、次顶极乔林(SCAF)和顶极乔林(CAF)为研究对象,对植物多样性与土壤微生物群落多样性进行关联分析,探究森林恢复能否促进整个生态系统的恢复,为岩溶森林生态保护修复和科学管理提供理论依据.结果表明:(1)随着森林的恢复,植物群落的物种丰富...

Correlation Analysis of Plant and Soil Microbial Diversity during Forest Natural Restoration in Karst Region, Southwest China

In this study, herb lands (HL), shrub lands (SL), shrub and arbor forests (SAF), sub-climax arbor forests (SCAF), and climax arbor forests (CAF) in the process of natural forest restoration in Karst area were taken as the research objects.The correlation analysis between plant diversity and soil microbial community diversity was carried out to explore whether forest restoration can promote the recovery of the whole ecosystem and provide theoretical basis for ecological protection, restoration and scientific management of Karst forests.The results showed that:(1) With the restoration of forest, the species richness of plant communities increased significantly, the species richness of plant communities increased significantly with forest restoration, from the lowest value of 8.44 at HL stage to 32.67 at SCAF stage, and then decreased to 17.33 species at CAF stage.(2)With the forest restoration, the contents of soil organic carbon, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, available potassium, exchangeable calcium and exchangeable magnesium increased significantly, and the soil pH value decreased significantly, from 7.51 at HL stage to 6.45 at CAF stage.The soil bulk density changed in "V" shape, HL was the highest, SAF was the lowest, and CAF was the second highest.(3)The contents of soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial biomass phosphorus (MBP) increased significantly with the restoration of forest.MBC and MBN had increased from (425.53±51.05) mg·kg^-1 and (61.26±16.96) mg·kg^-1 at HL stage to the peak of SCAF, which were (1 015.36±46.69) mg/kg and (310.45±11.90) mg·kg^-1, and then decreased to (901.95±75.29) mg·kg^-1 and (242.55±26.60) mg·kg^-1 at CAF stage, respectively.The Shannon-Wiener index, Simpson index and Pielou''s evenness index of soil microbial community also showed a similar pattern, which increased continuously with forest restoration.(4) The linear regression analysis showed that except the species richness index, there was a significant linear correlation between the same diversity index of plant community and soil microbial community at different restoration stages.(5)The structural equation model further revealed that soil microbial community diversity had multiple regulatory pathway, and 90% of the variation in soil microbial community diversity was explained by plant community composition, diversity, soil nutrients, soil microbial biomass and enzyme activities.In conclusion, the restoration of forests in Karst areas can promote the restoration of plant community species diversity, soil physical and chemical properties, and soil microbial community diversity, which is conducive to accelerating the restoration of ecosystem functions.