Abstract:
Objective Differences in soil bacterial community characteristics between native broadleaf plantation and primary secondary forest and their regulatory soil environmental factors were studied in order to provide a scientific basis of soil microbiology for the management strategy to optimize and transform existing plantations into near-natural forests.
Method Three native broadleaf plantations (Castanopsis hicklii, Michelia macclurei and Mytilaria laosensis) and primary secondary forest in the south subtropical China were selected as the objects. High-throughput sequencing and soil physicochemical properties were performed on soil samples from 0 - 20 cm, 20 - 40 cm and 40 - 60 cm of each stand, and the responses of soil bacterial community structure, Alpha diversity and molecular ecological network structure to different stands were investigated.
Result ① Soil bacterial community structure was significantly different between primary secondary forest and native broadleaf plantation, and primary secondary forest had higher soil bacterial Alpha diversity and network structure complexity than native broadleaf plantation. ② The main factors affecting soil bacterial community structure, Alpha diversity and network structure complexity between native broadleaf plantation and primary secondary forest were soil pH, water content, NO3−-N and available phosphorus.
Conclusion From the perspective of soil bacterial community structure and diversity, While protecting existing primary forests and primary secondary forests, advocating the construction of mixed plantations with multiple broadleaf species imitating primary secondary forest can enhance soil bacterial diversity and network structure complexity, which will promote the sustainable development of the ecological functions of the artificial forests in the region.
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