| Effects of straw mulching and irrigation amount on soil moisture of winter wheat under drip irrigation in North China Plain |
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| DOI：10.7606/j.issn.1000-7601.2017.04.18 |
| Key Words: winter wheat drip irrigation straw mulching soil evaporation soil moisture water use efficiency |
| Author Name | Affiliation | | SHI Jia-liang | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | WANG Xiu-ru | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | CUI Wei-jie | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China | | HU Shu-dong | College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China |
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| Abstract: |
| This study explored the effects of straw mulching and irrigation amount on soil moisture of winter wheat in the North China Plain in 2014 and 2015. Evaporation (E), soil moisture content of different soil layers (θ), soil surface temperature (Tc), leaf area index and yield were investigated under six treatments, including low irrigation with straw mulching (D1), low irrigation without straw mulching (D2), medium irrigation with straw mulching (D3), medium irrigation without straw mulching (D4), high irrigation with straw mulching (D5), and high irrigation without straw mulching (D6). The result showed that E of wet zone was generally larger by an average of 16.45mm than that of dry zone, the changes of the dry zone E exhibited more greatly after heavy raining. The average E of each growth period was reduced by straw mulching treatments when compared to non-mulching treatments, with the reduction of 20.45%, 24.77% and 19.14% under low, middle and high irrigation amounts, respectively, while the changes of E under mulching treatments presented more vigorous intense after heavy raining. The irrigation amounts had no significant effects on E. Straw mulching exhibited a significant interception effect on the irrigation water under low irrigation amount, and preserved soil moisture as irrigation amount rose. Throughout the observation period, E/ET decreased first and increased later, and was significantly affected by irrigation amount, with the average E/ET values being 29.71%, 25.64% and 21.38% for D1, D3 and D5, respectively. Compared to non-mulching treatments, the average E/ET of straw mulching treatments were decreased by 8.93%, 3.01% and 0.44% under D1, D2 and D3, respectively. Water use efficiency was generally higher under straw mulching treatments relative to non-mulching treatments, and a negative correlation was observed between WUE and irrigation amounts. In summary, the D3 treatment (middle irrigation, straw mulching) was most suitable for drip irrigation of winter wheat in local area due to the better performance of yield and WUE. |
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