Analysis of Relation and Variation Characteristics Between Soil Water and Groundwater in Planting Conditions

摘要

The station located in Aksu region is distributed under the Tarim Basin oasis which is in arid condition, it is the largest cotton producing area in China, also is has the greatest changes in the Tarim Basin. The study of arid farmland ecosystem water oasis, salinity and nutrient rule change process, water-saving irrigation technology demonstration theory and the ideal place for the sustainable development of agriculture and the oasis are very typical representative. In this paper, we make cotton growing soil water - groundwater changes as the study objection, focusing on the analysis of soil moisture in farmland ecosystem and the correlation between groundwater. The basic data of this paper came from experimental field station in Aksu, such as--soil moisture, groundwater depth, they are segmented by cotton fertility cycle in order to analyze soil moisture trends, combined with the local irrigation analysis of soil moisture under different irrigation curves, finally, we will combine these conclusions with evaporation, temperature and other weather station related data, then make a comprehensive analysis of the relationship between soil water, groundwater depth and amount of irrigation, evaporation. We draw the following conclusions: First, the characteristics of soil moisture conditions analysis can divide the soil into four layers: dramatic changes in the surface layer(0～30cm), water supply layer(30～50cm), graded layer(50～100cm) and are stable layer(100～150cm); Secondly, we found that under different irrigation amount, different evaporation affected by different growth stages of cotton water requirements of different factors; Finally, we fit the trend line chart with two lines means a comprehensive analysis of the soil water - groundwater relationship, while the thesis raised the topic in favor of crop irrigation proposal.