Ullah Saif,Liao Chengrui,Xu Yuanyuan,Li Wannian,Ali Izhar,Han Xiaomei,Ye Shaoming,Yang Mei
Purpose: This study explores the accumulation of phenolic acids in soil within monoculture plantations of Eucalyptus , Acacia mangium , contrasting with mixed species plantations containing both species, across various seasons. The research aims to provide insights into how different plantation types and species compositions influence the presence and levels of phenolic acids in soil. Methods: Soil phenolic acid concentrations were determined using HPLC, analyzing seven phenolic acids, including p-hydroxybenzoic, ferulic, coumaric, and benzoic acids. The kinetic adsorption experiments evaluated phenolic acid adsorption rates and quantities across various soil types. An adsorption kinetic model compared these concentrations between monoculture and mixed forest soils. Results: Our findings showed that plantation types, soil positions and seasons significantly impact phenolic acid accumulation. Non-rhizosphere soil in monoculture Eucalyptus plantations exhibited the highest phenolic acid concentration an average (32 µg g -1 ) across all seasons compared to mixed species plantations. Conversely, the rhizosphere soil of monoculture Acacia mangium displayed the highest content, reaching 71 µg g -1 in March. Notably, four phenolic acids (p-hydroxybenzoic, ferulic, coumaric, and benzoic acids) varied significantly between monoculture and mixed forests. Additionally, adsorption kinetic studies revealed that monoculture Eucalyptus and Acacia mangium soils had higher adsorption capacity compared to mixed species soils. The application of Elovich model yielded the best fit for ferulic and coumaric acids (R 2 > 0.45). Conclusion: Mixed species plantations of Eucalyptus and Acacia mangium significantly influence soil phenolic acid levels compared to monoculture forests and induce alterations in soil adsorption characteristics for phenolic acids, potentially impacting soil fertility and productivity.
Ning Li,Wenjing Meng,Lin Chang,Zhaolei Qu,Bing Liu,Kang Liu,Yuemei Zhang,Lin Huang,Hui Sun
Forest succession induced by pine wilt disease can result in changes in vegetation, thereby reducing timber production and impacting the input of belowground litter. Litter decomposition plays a crucial role in nutrient cycling within forest ecosystems. However, studies focusing on the litter decomposition process during forest succession are not common. Therefore, we investigated the decomposition rates of litter, enzyme activities, fungal communities, and functional genes in pine needles and twigs in pure ( Pinus massoniana ) and mixed ( P. massoniana and Liquidambar formosana ) forests over three consecutive years. The results indicated that the decomposition rate of pine needles ranges from 57.79 % to 74.53 %, while the decomposition rate of pine twigs ranges from 24.16 % to 60.57 %. There is no significant difference in the litter decomposition rates between mixed and pure forests. During litter decomposition, the activity of acid phosphatase in pure forests was consistently higher than in mixed forests. Pure forests recruited more unique fungi to participate in decomposition compared to mixed forests. The fungal network connections in mixed forests are more complex than those in pure forests, and they become even more complex in the later stages of decomposition. There are differences in functional gene structure between mixed and pure forests, with an increase in the abundance of nitrogen cycle genes ( nirK 1, nirK 2, nirK 3, nirS 1, nirS 2) and phosphorus cycle genes ( phoX ) in mixed forests, thereby promoting nutrient cycling. In summary, these research results provide new insights into the mechanisms that regulate ecosystem functions and fungal community during forest succession.
危险品化学品经营许可证（带存储）