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| DOI：10.13522/j.cnki.ggps.2016.0225 |
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| Spatial Distribution of Salt in Cotton Field under Different Irrigations: Taking the Irrigation District in Middle Reaches of Manas River as an Example |
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CHEN Wenling, RAN Shenghong, LIU Taotao
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Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China; Institute of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
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| Abstract: |
| 【Objective】 Poorly managed irrigations could give rise to soil salinity and this paper is to analyse the spatial distribution of salt under different irrigation in a cotton field aimed to provide guidance for water-saving irrigation without leading to salinization in arid regions. 【Method】 We took the middle stretch of Manas River as an example, from which we measured salt content in soil samples taken across a field under different irrigation methods.【Result】①Under different irrigation methods, salt contents in 0~40 cm and 0~100 cm soil were the highest in farrow land, moderate in cropland under drip irrigation, and least in field under flood irrigation; soil salt content increased as the time of the drip irrigation elapsed. ②The vertical salt distribution varied. In farrow land, salt distributed approximately uniformly, while under flooding irrigation, the salt accumulated within 20~60 cm. There was no specific pattern for salt distribution under drip irrigation. ③The variation coefficient of salt in soil also depended on irrigations, being highest in the flooding irrigated land and least in the farrow land, with the drip irrigated land between. Temporally, the variation coefficient decreased in the first five years then increased from Year 5 in the drip irrigated land. Vertically, the average variation coefficient decreased with increasing depth. 【Conclusion】 Irrigation methods had noticeable effects on soil salinity and spatiotemporal distribution of salt in the fields. |
| Key words: irrigation methods; soil salinity; salt distribution; coefficient of variation; irrigation area in middle reaches of Manas River |
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