| Cite this article: | 范未华,轩俊伟,李保国,等.定点监测滴灌棉田表层土壤盐分时空变化特征[J].灌溉排水学报,2020,(12):-. |
| fanweihua,Xuanjunwei,libaoguo,et al.定点监测滴灌棉田表层土壤盐分时空变化特征[J].灌溉排水学报,2020,(12):-. |
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| DOI： |
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| Spatio-temporal changes of surface soil salinity in cotton fields under drip irrigation |
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fanweihua1, Xuanjunwei1, libaoguo2, shijianchu2, liuyunhua1, shengjiandong1
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1.Xinjiang Key Laboratory of Soil and Plant Ecological Process, College of Grass and Environmental Sciences, Xinjiang Agricultural University;2.College of Land Science and Technology , China Agricultural University, Beijing
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| Abstract: |
| With drip irrigation increasing, the issue of soil salt accumulation has been paid close attention. The objective of this study was to examine the spatial-temporal characteristics of soil salt and its ions at field scale under long term drip irrigation conditions.A cotton field with an area of 143.52 ha in Baotou Lake Farm, Korla City, Xinjiang, was divided into three monitoring sampling units according to the planting years (10, 14, and 16 years up to 2018). We used grid method and collected soil samples on 111 sampling sites in 2003 and 2018. (1) After long-term drip irrigation, the contents of total salinity, main ions and their coefficients of variation in the surface soil decreased significantly, and soil salinity and its coefficients of variation decreased from 18.08 to 7.35 g kg-1 and 116.8% to39.4%, respectively from 2003 to 2018; (2) In 2003, salinity and its ions content was significantly higher in the field with 10 planting years, however, there is no significant difference between the field with 10, 14 and 16 planting years in 2018; (3) The soil desalination rate was significantly positively correlated with the initial salinity content (R2 = 0.97) and decreased with the planting years. The desalination rates for 10 planting years(4.75g kg-1a-1)was significantly higher than that for 14 and 16 planting years (0.59 and 0.47 g kg-1a-1 respectively); Using Kriging interpolation method, soil desalination rates for 10, 14, and 16 years were estimated to be 85%, 53% and 51%, respectively.These results indicated that, for heavily salinized soil, the spatial heterogeneity of soil salt decreases rapidly and tends to be uniform after 10 years of drip irrigation, which mainly depends on the rate of soil desalination, initial salinity content and planting years. The results will deepen our understanding of the temporal and spatial evolution of soil salinity under the condition of long-term drip irrigation, and provide a scientific basis for the safe and sustainable utilization of salinized soil in Oasis Farmland in arid area. These results will also enrich our knowledge and understanding of the spatial-temporal evolution of soil salinity under drip irrigation conditions, and provide a scientific basis for the safe and sustainable use of saline-alkali soil resources. |
| Key words: Soil salinity; Historical grid sampling; Surface soil; Planting years; Drip irrigation |
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