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题名	焉耆盆地土壤水盐分布及灌田水盐动态过程模拟
作者	李海霞
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	杨井 ; 陈亚宁
关键词	焉耆盆地 土壤水盐 空间变异 Hydrus-1D模型 Yanqi basin soil water soil salt spatial variability Hydrus model
学位专业	理学硕士
英文摘要	The Yanqi basin, located in the arid area of Northwest China oasis, includes four county and a number of agricultural farms. The groundwater and surface water resources in the Yanqi basin provide a solid base for the economic development of Southern Xinjiang. In the Yanqi basin, the rainfall is low, the evaporation is large, and the unreasonable irrigation leads to the accumulation of salt on the soil surface. Soil salinization has seriously threatened the sustainable economic development and ecological security of the Yanqi basin.This paper takes Yanqi County thoroughbred field and the Yanqi basin as an example, to study the temporal changes of soil moisture and soil salinity and their spatial variabilities and distributions. This was done by combining field measurement campaign, lab analysis and soil water and salt modelling with Hydrus-1D. The Hydrus-1D model was used to simulate soil moisture and salinity transport for two irrigation scenarios. We get the best irrigation scheme. The main conclusions include: (1) Soil sample analysis shows that sulfate chloride is the main component of the soil salinity in the Yanqi basin.The total salt and Cl-, SO42-, Na+, K+, Ca2+ are positively correlated, the first principal component represents the soil structure and salt composition, and the second principal component represents the pH of the soil.(2) The spatial variability analysis shows that the soil salt content of each layer was more consistent with the Gauss model, and the spatial correlation of surface soil salinity was weak. The spatial variability of surface soil moisture was moderate, and the spatial variability of soil moisture in the other layers was very weak. (3) The soil salinity increases gradually from the west to the east, and gradually increases from the north to the south of Kaidu river. The range of non-salinization increased with the increaseing soil thickness, Soil moisture shows a trend of increasing from the west to the east. (4) The soil salinity concentrates in the boundary of the oasis and in the drainage area. (5) For soil temperature with a film and without a film: at 0~70cm it varies like a cosine function. The soil temperatures of a film is higher than without a film. (6) For soil water content with a film and without a film: at 0~50cm it varies like a cosine function; The soil water content in upper soil layer is greatly affected by root system, at 0~50cm soil salt varies like a cosine function, it is relatively stable at 50~70cm for both with a film and without a film.(7) There is a positive relationship between soil temperature and air temperature, and the influence of atmospheric temperature on soil temperature is weakened with the increase of soil depth. Overall, with the increase of temperature, the water content with a film and without film gradually decreases, and the salt content with a film and without a film decreases. (8) The study area was set up with Hydrus-1D model, then calibrated and validated with the measured soil water and salt of July 1, 2016 to September 9, 2016. In addition, based on the developed irrigation scenarios, the study compared the effects of different irrigation scenarios on the soil moisture and salility, and recommended the suitable irrigation schemem.
语种	中文
学科主题	自然地理学
内容类型	学位论文
源URL	[http://ir.xjlas.org/handle/365004/14881]
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	李海霞. 焉耆盆地土壤水盐分布及灌田水盐动态过程模拟[D]. 新疆乌鲁木齐. 中国科学院大学. 2017.

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