The Effects of Aerated Irrigation on Soil Respiration and the Yield of the Maize Root Zone

文献类型： 外文期刊

第一作者： Yu, Zhenzhen

作者： Yu, Zhenzhen;Wang, Chun;Sun, Haitian;Yu, Zhenzhen;Wang, Chun;Zou, Huafen;Wang, Hongxuan;Li, Hailiang;Sun, Haitian;Yu, Deshui

作者机构：

关键词： aerated irrigation; soil respiration; soil oxygen; yield; maize

期刊名称：SUSTAINABILITY （ 影响因子：3.889； 五年影响因子：4.089 ）

ISSN：

年卷期： 2022 年 14 卷 8 期

页码：

收录情况： SCI

摘要： To investigate the effect of aerated irrigation on the soil environment and yield in the root zone of maize, and to provide a basis for the extension of aerated irrigation, a 2-year experiment (2020-2021) was conducted at the Zhanjiang National Soil Quality Observation Experiment Station, with two experimental observations per year (spring-summer and fall-winter) to investigate the effects of aerated irrigation (AI) and non-aerated irrigation (CK) on soil respiration rate, soil temperature, water content, oxygen content, soil bacterial biomass and root biomass. We used partial least square regression analysis (PLSR) to establish the regression equations of soil respiration rate, soil temperature, water content, oxygen content, soil bacterial biomass and root biomass under the two treatments, and the screening of the main soil environmental factors affecting changes in soil respiration rate under aerated irrigation technology. The results showed that, compared with CK, the AI treatment significantly increased the soil respiration rate and soil oxygen content (15.38 similar to 17.87% and 18.94 similar to 25.17%, respectively), as well as the root biomass and soil bacterial biomass (14.99 similar to 19.09% and 35.10 similar to 45.59%, respectively), and reduced the soil water content by 5.33 similar to 12.71% (p < 0.05). The effects of different treatments on soil temperature were not significant. The mean fruit yield with AI treatment was also 7.16 similar to 20.51% higher (p < 0.05) than that with CK, and the stem thickness and leaf area of maize plants were significantly increased (9.31 similar to 17.06% and 8.68 similar to 15.20%, respectively (p < 0.05)). The regression fitting results showed that the soil respiration rate is quadratic polynomial negatively correlated with soil temperature, water content and soil oxygen, and the power function is positively correlated with root biomass and bacterial biomass under the two treatments. The variable importance for projection (VIP) values of the PLSR model showed a soil temperature VIP = 1.51, soil oxygen content VIP = 1.42 and root biomass VIP = 1.40, demonstrating that aerated irrigation technology can drive soil respiration rate by changing soil oxygen content and root biomass. Furthermore, the improvements in soil aeration conditions and respiration with AI appeared to facilitate the improvement in fruit yields, which also suggests the economic benefits of AI.

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