# Research Frontiers in the Field of Agricultural Resources and the Environment
## 3 Results
### Research and Judgment on Different Frontier Types  
This study conducted artificial professional interpretations for the frontiers obtained from the NIFA project and the SCI papers based on the LDA model. The topic on the \"interaction mechanism of plant-rhizosphere-microbial diversity\" was determined as the co-existent research frontier in the project and the paper. The \"wastewater treatment technology and efficient utilization of water resources\", the \"value-added utilization and sustainable development of agricultural waste\", the \"ecosystems management and pollution control related to agricultural and animal husbandry\", the \"soil ecological response mechanism under agronomic management measures\", and the \"mechanism of soil landslide, erosion, degradation, and prediction evaluation\" were identified as non-coexisting research frontiers. Indicators such as the emerging and attention degree of each frontier are shown in Table 5.  
By calculating the average value of each indicator, the average emerging degree was 2018.50. The average innovation level was 0.20. The average attention value of the project fund was 0.946 and for the papers was 9.778. The cumulative average of the project fund/paper attention value was 10.724. The average project crossover degree was 6.479 and for the papers was 1.974. By comparing the indicators of the abovementioned coexisting themes and non-coexisting themes with the average value, the coexisting theme of the \"interaction mechanism of plant-rhizosphere-microbial diversity\" had a high degree of emergence, attention, innovation, and cross-cutting, which indicated that this theme was a hot research frontier in recent years. The themes of \"wastewater treatment technology and the efficient utilization of water resources\", the \"value-added utilization of agricultural wastes and sustainable development\" in the NIFA project layout, as well as the themes of the \"soil ecological response mechanism under agronomic management measures\" and the \"mechanism of soil landslide, erosion, degradation, and prediction evaluation\" extracted from the SCI papers, had higher levels of novelty, innovation, and attention than the average value, indicating that the layouts concerning such research topics were relatively new. The layout of fund projects reflects their strategic significance and research value. However, there is no high-output stage achievement within scientific research, or alternatively some topics have not been laid out in fund projects; however, some researchers have carried out forward-looking research and achieved phased results, which means that some topics will have a greater possibility of further development. Therefore, the above four topics were judged as potential research frontiers. \begin{table}
\begin{tabular}{l l} \hline \hline
**Research Frontiers** & **Subject Words** \\ \hline \hline \multirow{3}{*}{\begin{tabular}{l} Theme 1 \\ Soil ecological response mechanism under \\ agronomic management measures \\ \end{tabular} } & \begin{tabular}{l} manure, diversity, straw, residue, fertilization, stock, phosphorus, enzyme, respiration, amendment, grassland, rotation, sequestration, compost, mineralization, stability, mulch, fertility, availability, labile \\ \end{tabular} \\  & \
\begin{tabular}{l} rhizosphere, decomposition, bacteria, fungi, diversity, fungal, grazing, mycorrhizal, nitrification, grassland, interaction, nematode, inoculation, trait, denitrification, micro-organization, functional, availability, strain, arbuscular \\ \end{tabular} \\  &
\begin{tabular}{l} Slope, estimate, rainfall, runoff, prediction, river, parameter, index, prediction, density, movement, character, variation, profile, physical, variability, measurement, variable, environmental, landscape \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Research frontiers in the SCI papers on global agricultural resources and the environment from 2016 to 2021.