摘要
通过比较典型灌区内7个（试验设计两个研究区共14块棉田）不同膜下滴灌年限棉田盐分分布,尝试揭示长期膜下滴灌农田根区土壤中盐分演变趋势。两研究区均表现为,应用膜下滴灌技术棉田根区盐分随着该技术应用年限的延长而逐渐降低;且表现为滴灌〈6a为迅速脱盐阶段,6-8a为平稳脱盐阶段,〉8a为盐分稳定阶段。头年10月至翌年4月,膜下滴灌棉花根层盐分降低显著。滴灌棉田根层盐分的逐年降低,使得棉花根区生境得到改善,应用膜下滴灌技术5-7a内,其对棉花根层生境改良效果较明显,3-7a棉花成活率年均增幅大于26.75%、产量年均增幅超过19.57%。滴灌7-9a以上,棉花根层生境良好,成活率大于82%,产量超过5200.00kg/hm^2。
By comparing the salt distribution in different drip irrigation age on 7 typical irrigation area（ two study area and 14 cotton fields is designed in the experiment）,we tried to reveal the salinity evolution trend of root zone soil in long- term drip irrigation. Two of the study area showed that the salinity in cotton root zone was gradually reduced with the extension of the technology age,and it characterized that the drip irrigation less than6 years was the rapid desalting stage,between 6 to 8 years was the smooth for desalination,and it was the stable phase when the drip irrigation more than 8 years. From October to next April was the main period for salinity reduction in cotton root zone. The salt of cotton root layer reduced year by year,it made the cotton root zone habitat be improved. As application of drip irrigation under film within 5 to 7 years,the cotton root layer habitat improvement effect was obvious,when the technology applied 3 to 7 years,annual average survival rate of cotton increased more than 26. 75%,the yield increased more than 19. 57%. When drip irrigation applied more than 7to 9 years,the habitat of cotton root layer was good,the survival rate was more than 82%,and the yield over5200. 00 kg / hm^2.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2015年第8期161-166,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(51369027)
石河子大学杰青培育项目(2013ZRKXJQ02)资助
关键词
长期膜下滴灌
根区盐分
棉花生长
long-term drip irrigation under mulch
soil salinity in root zone
cotton growth
