论文部分内容阅读
利用识别后的SWAP模型,探讨了微咸水灌溉条件下土壤水盐及其均衡要素的转化关系和土壤的积盐趋势预测。结果显示,两种灌溉定额下土壤盐分都有所增加,但淋洗灌溉定额下比正常灌溉定额下小麦、葵花和玉米模型土壤盐分分别降低了6.5%、0.7%、4%;小麦、葵花和玉米的相对减产率分别比正常灌溉定额下降低了1%、2%、6%。微咸水灌溉后在灌溉定额和灌溉水浓度不变的前提下,土壤盐分的积累随着时间的推移而呈递减趋势,大约在10a后盐分达到进出平衡状态,此时土壤的含盐量达到0.1852mg·cm-3,比微咸水灌溉前增加0.0822mg·cm-3。但仍属于轻度盐渍土(土壤含盐量0.126%),不会对土壤水土环境产生较大的影响。
Based on the SWAP model, the relationship between soil water and salt and its equilibrium elements under saline water irrigation and the trend of salt accumulation in soils were discussed. The results showed that the soil salinity increased under both irrigation quotas, but the soil salinity decreased by 6.5%, 0.7% and 4% respectively under the irrigation quotas under the normal irrigation quotas; the wheat, sunflower and The relative yield reduction of maize decreased by 1%, 2% and 6% respectively from the normal irrigation quota. Under the condition of constant irrigation quota and irrigation water concentration after brackish water irrigation, the accumulation of soil salinity decreased with the passage of time. After about 10 years, salinity reached the equilibrium state of entering and leaving, at this time the salinity of the soil reached 0.1852mg · cm-3, which increased by 0.0822mg · cm-3 compared with brackish water before irrigation. It still belongs to mild saline soil (0.126% of salt content in the soil), and will not have a greater impact on soil water and soil environment.