| Effects of subsurface pipe and shaft on soil salinity in cotton field in arid saline\|alkali land under drip irrigation and mulch |
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| DOI：10.7606/j.issn.1000-7601.2021.06.11 |
| Key Words: drip irrigation leaching subsurface pipe shaft soil salinity microbial diversity |
| Author Name | Affiliation | | XU Xuan | Shihezi University, College of Water & Architectural Engineering, Shihezi, Xinjiang 832000, China | | HE Xinlin | Shihezi University, College of Water & Architectural Engineering, Shihezi, Xinjiang 832000, China | | HENG Tong | Shihezi University, College of Water & Architectural Engineering, Shihezi, Xinjiang 832000, China | | FENG Yue | Shihezi University, College of Water & Architectural Engineering, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In order to study the variation law of soil salt balance and abundance characteristics of microbial community in cotton fields in arid areas under drip irrigation combined with collaborative drainage, the field drainage experiments were carried out in typical arid saline\|alkali areas of Xinjiang (141 regiment). Two\|factor collaborative drainage of subsurface pipe and shaft was set in the experiment. Five levels in the X-axis direction (0, 15, 30, 45 m and 60 m from the shaft, denoted as T1, T2, T3, T4, and T5) and three levels in the Y-axis direction (0, 5 m and 7.5 m from the subsurface pipe, denoted as P1, P2 and P3) were set to analyze relationships between soil salt and groundwater level and soil microorganisms. The results showed that the electrical conductivity of 0 ~ 700 cm soil layer decreased after leaching test, and the desalination of 200~400 cm soil layer was the most obvious, with a minimum of 0.9254 dS·m-1. The average desalination rate during the whole growth period was 70%. The soil desalination effect was the best at 5 m from the underground pipe and 45 m from the shaft. In addition, the groundwater depth in the whole growth period showed a trend of first decreasing and then increasing, with a maximum 2 m decrease. The influence of groundwater level on soil salinity was lagging. The Chao1 index, diversity index and richness index of microorganisms in soil increased with the decrease of soil salinity. Studies indicated that drip irrigation combined with subsurface pipe and shaft drainage was conducive to reducing deep soil salinity, controlling groundwater level, improving soil microbial community diversity, promoting the improvement of salinization farmland in arid areas and restoring abandoned farmland. |
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