The bottom-up effects of microbial communities on soil nematode communities were important drivers of nematode communities in subtropical forests.
The structure of soil nematode community was more sensitive to microbial community compared to plant community. The plant parasite index decreased with forest stand ages, which indicated that ecosystem function and health would be improved as nature restoration. Soil available nitrogen and phosphorus were key factors influencing soil nematode abundance and diversity during secondary forest succession. Soil nematode abundance gradually increased with forest stand ages, which reached a peak value (574 individuals 100 g −1 dry soil) in the oldest stands. To enhance our understanding of the factors influencing soil nematode communities, we also examined the relationships between plant community, soil microbial community, and soil properties by structural equation modeling. Six succession stages of nature restoration were sampled to represent forest stand age groups with 4-5, 8-12, 18-22, 25-30, 35-40 and over 100 years. The soil nematode community of natural secondary forests was investigated using a chronosequence approach in subtropical forests in China. However, the dynamics of the abundance, structure of soil nematode community remain unclear under nature restoration. Soil nematode community is an important component of the soil food web, which has been widely recognized as a key bio-indicator for assessing the influence of nature restoration on ecological functions.
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