Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (5): 1132-1143.DOI: 10.3969/j.issn.1004-1524.2023.05.17

• Environmental Science • Previous Articles     Next Articles

Effects of intercropping on stoichiometric characteristics and nutrients contribution rate of soil aggregates in Rosa roxbunghii Tratt. orchard

WU Chuanmei1(), HE Ji1,*(), WU Wenshan1, CAI Jun1, XIANG Yangzhou2   

  1. 1. College of Agriculture, Guizhou University, Guiyang 550025, China
    2. School of Geography and Resources, Guizhou Education University, Guiyang 550018, China
  • Received:2022-03-07 Online:2023-05-25 Published:2023-06-01

Abstract:

To reveal the effects of intercropping on the stoichiometric characteristics of soil aggregates and soil nutrients in Rosa roxbunghii Tratt. orchard, three planting modes of corn-Rosa roxburghii intercropping, pepper-Rosa roxburghii intercropping and Rosa roxburghii monoculture were set up, and the eco-stoichiometric characteristics, available nutrients contents and soil nutrients contribution rate of aggregates in Rosa roxburghii orchard under different treatments were studied. The results showed that intercropping could effectively improve the nutrients contents of large aggregates (particle size ≥0.25 mm) in the 0-20 cm soil layer of Rosa roxbunghii orchard. The effect of corn-Rosa roxburghii intercropping on improving the organic carbon content of soil aggregates was better than that of pepper-Rosa roxburghii intercropping, yet the effect of pepper-Rosa roxburghii intercropping on improving the contents of total nitrogen and available nutrients of soil aggregates was better than that of corn-Rosa roxburghii intercropping. In 0-20 cm soil layer, the C/N ratio of aggregates was higher under intercropping than that under monoculture, yet the N/P ratio of aggregates was smaller under intercropping than that under monoculture. Based on this, it was inferred that the long term intercropping could enhance the limiting effect of soil nitrogen on the growth of Rosa roxburghii, while the long term monoculture could enhance the limiting effect of soil phosphorus. Under intercropping modes, the contribution rates of large aggregates to soil organic carbon, total nitrogen, total phosphorus, alkali-hydrolyzable nitrogen, available phosphorus and available potassium were 41.2%-56.8%, 44.8%-58.2%, 46.3%-60.0%, 51.9%-62.3%, 52.4%-66.3% and 43.5%-58.9%, respectively, under intercropping, while the contribution rates were 31.1%-31.6%, 30.6%-38.7%, 30.6%-46.4%, 37.9%-52.8%, 30.8%-38.9% and 27.2%-38.6%, respectively, under monoculture. In conclusion, intercropping was conducive to increase the content of large aggregates and their contribution to soil nutrients, so as to improve the soil nutrient supply capacity of soil in Rosa roxburghii orchard.

Key words: intercropping, Rosa roxburghii Tratt., soil aggregates, soil nutrients, stoichiometric characteristics

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