摘要
井灌种稻虽然是近年来松嫩平原西部土地苏打盐碱化治理的有效途径,但苏打盐碱地种稻改良对土壤盐分状况的长期影响,却缺乏定量化评价。作者选择该区代表性地点,通过田间观测与建立模型相结合的方法,对现有种植条件下的水田盐分动态变化进行了模拟和检验。研究发现,经过一定开垦年限土壤剖面平均含盐量下降到1.5g·kg-1左右后,在降水量正常的条件下,土壤盐分已基本达到平衡,不再随着开垦年限增加而进一步下降。相反,如遇干旱年份土壤盐分还会略有增加。需要进一步采取增加排水次数、改善土壤通透性等其它技术措施,才能使苏打盐碱地种稻改良达到更加理想的效果。
Planting paddy rice irrigated by using groundwater has been a successful method for amelioration of sodic saline soils in western Songnen plain in recent years. But very few studies have been reported on evaluation of the long-term impact on soil salt balance during the paddy rice practice. Based on two-year field experimental measurements in a typical area and a soil salt balance model, the average soil salt content changes of 1.2 m depth were simulated and validated. The results showed that the paddy soil salt content would not decrease any more under the average rainfall year conditions through further paddy rice planting when the soil salt content reached 1.5 g·kg-1. It even may increase slightly in dry year conditions because of more irrigation. The other techniques such as increasing drainage and improving soil permeability are needed for better soil amelioration.
出处
《生态环境》
CSCD
北大核心
2005年第3期396-398,共3页
Ecology and Environmnet
基金
国家"十五"重点科技攻关课题(2001BA508B05)
关键词
苏打盐碱化
水田
模型
模拟预测
土壤盐分变化
salinisation
paddy
model
simulation and prediction
soil salt balance
