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Fraxinus mandshurica Rupr. is one of the main afforestation species in northeast China, and there is great demand for improved F. mandshurica varieties. The results of an investigation into and analysis of the growth traits of F. mandshurica provenances and families showed that there were significant differences in different periods. However, variations in growth traits decreased year by year. There was a significant negative correlation between tree heights of the provenances and sunshine hours in their areas of origin. The provenances of Xinglong, Hailin and Wuchang were selected based on the volume of 18-year-old trees. The average genetic gain from the selection of fast-growing provenances was 19.4%. Ten superior fast-growing families were selected. The average volume of the selected families was 22.6%, higher than that of all families. The correlation coefficient between heights at 6-year-old and at 18a was 0.838 for provenances, and between heights at 4-year-old and at 18-year-old was 0.303 for families. These results indicate that early selection for height in provenances or families could be performed at 6 years or 4 years, respectively. Early selection for DBH and volume in families could start at 8 years.

General Secretary Xi Jinping pointed out that the digital economy is an important driving force for future economic and social quality, efficiency and structure changes, and increasing farmers' income is the key to solving the three rural issues and realizing rural revitalization. Based on the three indicators of agricultural management level, farmers' digital literacy and agricultural investment degree in Anhui Province, this project deeply analyzes the impact of digital economy on farmers' income, and formulates specific countermeasures by combining the development of digital economy in the production, management and sales of agriculture, so as to effectively solve agricultural production problems. So as to provide some policy reference for the government to improve farmers' income level and narrow the gap between urban and rural areas.