| Effects of irrigation amount and degradable membrane mulching on soil respiration and yield of drip-irrigated corn |
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| DOI：10.7606/j.issn.1000-7601.2019.05.01 |
| Key Words: corn drip irrigation irrigation amount degradable membrane soil respiration yield |
| Author Name | Affiliation | | WANG Feng-jiao | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi University, Shihezi, Xinjiang 832000, China | | WANG Zhen-hua | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi University, Shihezi, Xinjiang 832000, China | | LI Wen-hao | College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China
Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi University, Shihezi, Xinjiang 832000, China |
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| Abstract: |
| In order to investigate the relationship between irrigation amount and degradable membrane on the dynamic changes of soil respiration in drip irrigation field and its influencing factors and yield, a suitable degradable membrane and irrigation amount were sought. In the plot test, three irrigation levels were set as W1: 4 625 m3·hm-2, W2: 5 625 m3·hm-2 and W3: 6 625 m3·hm-2, and two degradable membranes as M1: induction period of 60 d, M2: induction period of 80d and ordinary plastic mulch (M3). We studied the effects of different treatments on soil respiration rate, its influencing factors, yield, etc. The results showed that the daily change of soil respiration rate showed an unimodal change, and the highest value appeared at 14:00. The soil respiration rate increased first from the seedling stage to the mature stage, and the maximum value of the W2M3 was 7.89 μmol·m-2·s-1. There was a significant positive correlation between soil respiration rate and soil temperature and air temperature, and no correlation with soil moisture content. The soil temperature sensitivity coefficient Q10 varied from 1.584 to 2.034. The soil respiration total range during the maize growth period ranged from 17.75 to 23.44 t·hm-2, and the grain yield ranged from 11.60 to 12.81 t·hm-2. The Q10 of W2M3 was 2.034, the total amount of soil respiration was 23.44 t·hm-2, the yield was 12.81 t·hm-2, and the economic return was 6 815 yuan·hm-2, which both reached the maximum values; but iWUE was at 2.28 kg·m-3 and was the maximum and the economic-environmental benefit was 1.83 kg·kg-1, which was not optimal. The maximum value of iWUE in W1M2 was 2.51 kg·m-3, and the economic-environmental benefit of W2M2 was optimally at 1.42 kg·kg-1. Through comprehensive analysis of soil respiration total, grain yield, economic-environmental benefit value, income, iWUE relationship model, the optimal irrigation amount was 5 625 m3·hm-2, and the induction period was 80 d. |
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