不同灌溉模式下绿洲土壤盐分再分布研究
文献类型：学位论文
| 作者 | 罗雪园 |
| 答辩日期 | 2017-05-01 |
| 文献子类 | 硕士 |
| 授予单位 | 中国科学院大学 |
| 授予地点 | 新疆乌鲁木齐 |
| 导师 | 周宏飞 |
| 关键词 | 膜下滴灌 沟灌 畦灌 土壤含盐量 脱盐率 淋洗效率 Drip irrigation Furrow irrigation Border irrigation Soil salinity Leaching Leaching efficiency |
| 学位专业 | 理学硕士 |
| 英文摘要 | It is an effective measure to manage saline-alkali land and prevent and control theoasis soil secondary salinization through the way of irrigation. Facing serious watershortage in arid areas, this is the basis of determine the salt leaching system ofwater-saving irrigation through further study of soil salt movement characteristicsunder different irrigation mode, which is of great significance for the sustainabledevelopment of oasis agriculture. This study’s operation is in Fukang DesertEcosystem Observation Experimental Station, Chinese academy of sciences, we usethe method of combining field test and laboratory experiments, and discuss thevariation characteristics of spatial and temporal of soil salinity under differentirrigation modes and different irrigation quota combination, and identify theimprovement effects on saline soil and salt leaching efficiency under differentirrigation quota of different irrigation patterns. In this paper, the main conclusions areas follows.(1) Under different irrigation patterns, when the irrigation quota is set at 2500-7000 m3/ hm2, the soil salinity all show a trend of desalination from 0cm to 80cm in the growthperiod, but it shows a trend of increasing in less than 80 cm, this indicates that the soilsalinity changes from surface poly to bottom poly under water leaching. During theirrigation period, the change of soil salinity in the surface layer is more severe than thatin the bottom layer.(2) Under mulch drip irrigation, the greater the amount of irrigation, the higher thedesalination rate, the better the effect of salt leaching. In vertical direction, the greaterthe amount of irrigation, soil salinity leaching deeper, the leaching depth reaches 1.2meters when the irrigation quota is 7000m3/hm2,while the leaching depth reaches onemeters and more than one meter of soil layers when the irrigation quota is 4000m3/hm2and 3000m3/hm2; In horizontal direction, the greater the amount of irrigation, thegreater the difference that soil salinity between film and soil film in different soil layers, when the irrigation quota is 7000m3/hm2, the difference between the membraneand the membrane of different soil salinity is higher than 0.03g/kg.(3)Under the condition of furrow irrigation and border irrigation, the higher salinitybackground value, the better the soil salt leaching. The soil salinity of No. 5 plots forexperimental field is highest than other testing field, its average soil salinity is 0.82g/kg and far more than other plots, the desalination effect is also the best, there is adesalination phenomenon within 1.4 m even deeper soil layer when the irrigation quotais 6000m3/hm2.(4)From looking at the rate of desalination, under the same irrigation quota, thedesalination rate of drip irrigation is lower than the desalination rate of borderirrigation and furrow irrigation, among the desalination rate of drip irrigation under themembrane is below 35%, while the desalination rate of furrow and border irrigationrate are more than 20%; From looking at the leaching efficiency, the same amount ofwater to salt leaching of film drip irrigation is higher than that of border irrigation andfurrow irrigation. In general, the greater the amount of the irrigation water, the betterthe leaching effect of soil salt. |
| 学科主题 | 自然地理学 |
| 语种 | 中文 |
| 源URL | [http://ir.xjlas.org/handle/365004/14889]  |
| 专题 | 新疆生态与地理研究所_研究系统_荒漠环境研究室 |
| 作者单位 | 中国科学院新疆生态与地理研究所 |
| 推荐引用方式 GB/T 7714 | 罗雪园. 不同灌溉模式下绿洲土壤盐分再分布研究[D]. 新疆乌鲁木齐. 中国科学院大学. 2017. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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