地膜残留导致土壤物理结构改变，使得土壤水分、养分运移受阻，特别在新疆等干旱地区，残膜导致地下水难以下渗，造成土壤次生盐碱化。但是目前有关地膜污染对水氮利用和分布均匀性以及对盐分运移影响的研究甚少。本项目拟利用大田控制试验和土柱模拟控制试验，采用稳定同位素技术、Trims水分定位监测技术，在轻度和重度残膜污染棉田，开展不同灌量对不同残膜水平棉田水氮利用和分布均匀性，以及盐分的运移的研究。旨在探明不同残膜水平下棉田水氮均匀性及其主要影响因素；揭示不同灌溉量和不同残膜水平对棉田土壤水氮均匀度影响；阐明灌溉量与残膜量对棉田土壤水、氮及盐分运移交互作用机理；确定不同残膜污染水平下棉田水分和氮素高效利用的机理。为防控地膜残留污染和促进地膜技术的合理应用提供理论依据。

The soil physical structure would be changed by mulch residue, and the moisture and nutrient of soil transport were hampered, Especially in arid regions such as Xinjiang, plastic film led to infiltration of groundwater was difficult, It would be resulted in soil salinization. But, in currently the film pollution researches on water and nitrogen use and distribution contamination of salt movement were less.The project intends to test of field and soil column controlled trial, the stable isotope techniques would be used, Trims locate moisture monitoring technology would be used too. the uniformity distribution of water and nitrogen and using and salt migration would be studied under different levels of irrigation amount in plastic film mild and severe pollution cotton fields. the main factors of water and nitrogen uniformity would be seeked under different levels of plastic film cotton fields; The interaction mechanism of water and nitrogen movement and salt were elucidated under different amounts of plastic film and different irrigation levels on plastic film. The measures and mechanisms of water and nitrogen using were identified at different levels of contamination in cotton plastic film. It would provide technical support for the management of residual contamination of farmland mulch.