Objective To investigate the ecological stoichiometric characteristics of jujube trees and orchard soils under different irrigation methods around Tarim Basin, as well as the inter-annual variation patterns of C, N, and P stoichiometric characteristics of jujube annual rings under different irrigation methods.

Methods The C, N, and P contents and nutrient contents of soil organic carbon (SOC), soil total nitrogen (TN), and soil total phosphorus (TP) in the annual cycle of jujube (2013～2020) under drip and diffuse irrigation methods were determined using the orchards of jujube trees in the Tarim Basin of southern Xinjiang as the research object.

Results Annual average content of C, N, P and N∶P of jujube body showed that drip irrigation>diffuse irrigation, while C∶P and C∶N showed that diffuse irrigation>drip irrigation; compared with diffuse irrigation, the annual average content of N of jujube body in drip irrigation increased significantly by 12.14%; The overall interannual changes of C, N and P contents and their stoichiometric ratios of annual rings of jujube under different irrigation methods showed similar trends. Among them, the interannual change trend of C content was relatively stable; N and P content showed an upward trend with the increase of tree age; and the interannual change trends of C∶N, C∶P and N∶P were similar, with an overall gradual decrease with the increase of tree age; With the increase of soil depth, soil SOC, TN, TP content and C∶P and N∶P were significantly reduced under different irrigation methods, of which SOC, TN content and C∶P and N∶P showed that diffuse irrigation was greater than that of drip irrigation, while TP content showed that drip irrigation was greater than that of diffuse irrigation; soil C∶N was significantly higher with the increase of soil depth, and there was no significant difference between the 2 irrigation methods; The results of redundancy analysis showed that soil factors such as SOC, TP, Available Phosphorus (AP) content and C∶P had a significant effect on the C, N and P content and their stoichiometric ratios of red date trees.

Conclusion The interannual changes of C, N and P ecological stoichiometric characteristics of jujube annual rings under drip irrigation and diffuse irrigation show a similar trend. In addition, drip irrigation increases the annual average content of C, N and P and N∶P of jujube trees compared with diffuse irrigation, but decreases soil SOC and TN content, as well as C∶P and N∶P. It is recommended to adopt the combination of drip and diffuse irrigation method in the future management of date tree plantations for sustainable production.