Land use types influence soil microbial community through effects on soil properties in the dry-hot valley region in southwestern China
- 1Yunnan university, Institute of international Rivers and Eco-security, Lab of international Rivers and Eco-security, China (taicongliu@163.com)
- 2Yunnan university, Institute of international Rivers and Eco-security, Lab of international Rivers and Eco-security, China (rongli@ynu.edu.cn)
- 3Yunnan university, Institute of international Rivers and Eco-security, Lab of international Rivers and Eco-security, China (xwduan@ynu.edu.cn)
- 4Yunnan university, Institute of Laboratory of Ecology and Evolutionary Biology, China (zhechen2019@ynu.edu.cn)
Abstract: Land use is one of the most important forms in agricultural production. Non-appropriate land use can cause deterioration of physical, chemical and biological properties of soil, thus affecting sustainable agriculture. Earlier reports showed that land use drastically altered microbial community composition. However, the mechanism of land use on microbial communities is still not fully understood. In the present study, we focus on the dry hot valley, characterized by high temperature and low humility, to test whether soil properties from four primary land uses including the land conversion from farmland (SLC), sugarcane land (SL), maize land with conventional tillage (CT) and bare land (BL) have different influences on soil microbial communities. The results showed that land uses altered bacterial and fungal community composition. In SL and BL, we found the respective absence of a kind of fungi at phylum the level. The abundances of several bacterial phyla in SL such as Gemmatimonadets and Acidobacteria associated with promoting mineralization were higher than that in other land uses. RDA indicated that bacterial communities were influenced by soil total nitrogen, total organic carbon and available potassium contents, and fungal communities were dominated by available potassium contents. SEM (structural equation model) showed that land use has direct and indirect effects on bacterial composition, while only indirect effects on fungal by land use. Land use indirectly affected bacterial composition through effects on soil moisture, clay and available potassium contents, whereas through effects on clay and available potassium for fungal composition. Land use exhibited greater impacts on bacterial composition than fungal composition, implying bacteria was more sensitive to land use changes compared to fungi in the dry-hot valley. Considering the low level of total potassium in soil under SL and CT, elevated potassium fertilizer would be a beneficial pathway to improve soil microbial composition and soil nutrients in the dry hot valley.
Key word: Land use, Soil microbial community, Dry-hot valley, Soil properties, Structural equation model.
How to cite: Liu, T., Rong, L., Duan, X., and Chen, Z.: Land use types influence soil microbial community through effects on soil properties in the dry-hot valley region in southwestern China, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-3963, https://doi.org/10.5194/egusphere-egu21-3963, 2021.
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