Influence of Groundwater on Soil Salinization and Its Reversal Evolvement in Wei-ku Oasis
详细信息
- 责任者：Han Guihong(College of Resource and Environment Sciences ; Xinjiang University ; Key Laboratory of Oasis Ecology ; Ministry of Education ; Urumqi ; Xinjiang 830046 ; China) ; Tashpolat Tiyip
- 刊名：Scientia Geographica Sinica
- 出版年：2012
- 卷期：32(3)
- 页码：p.362-367
- issnNo：ISSN1000-0690
- isbnNo：CN22-1124/P
摘要
Based on remote sensing data,and combined with groundwater level observation data,the study do an quantitative research for the relationship between soil salinization and groundwater,and explore the salinization reversal evolvement of Wei-ku oasis.The results show that: 1) the annual ground water lowered 0.05 meters in the study area,with a downward trend from 1997 to 2001 year;there was obviously declined in ground water from 2002 to 2007 year,the rate was 0.175 meters every year,which was mainly caused by human activity,human land cultivation,a lot of drilling and utilization of groundwater resources,and the rise and fall of groundwater caused soil salinization.2) the middle-mild saline land has declined by 63.1 km2 from 1989 to 2001 year;while the severe saline land has increased by 342.47 km2;the total area of salt-affected land increased 279.37 km2,the average annual increase of 23.28 km2.From 2001 to 2007 year,the middle-mild saline land has decreased by 155.42 km2;the severe saline land area has increased by 70.80 km2;the total saline area was obviously decreased by 84.62 km2,at an average annual decrease rate of 14.1 km2.3) the proportion of salinized land area is relatively high when the ground water level is in the range from 2.3 to 2.7 meters,there was a biggish value in 2.4 to 2.5 meters;the proportion is relatively low when the ground water level is in the range from 2.7 to 3.4 meters;4) Some parts of Wei-ku oasis has already in a reversal evolvement circumstance which is valuable for soil salinization,the ground water table is below threshold(4.66 meters),which would affect the surface salt accumulation,the groundwater mineralization degree is lower than 3 g/L;5) Salinization reversal evolvement presents temporal and spatial characters,and gradually occurs from the upper to the lower,and from the inside to the outside of Oasis.