我国棉花主产区变化与地膜残留污染研究 - 土壤碳循环与地膜覆盖课题组

目的】地膜覆盖是我国农业应用最为广泛的农艺技术之一，极大地促进了我国棉花产业的发展，推动了我国棉花主产区的变化。本文总结了我国棉花生产格局的变化特点，分析了地膜覆盖技术对我国棉花产业的影响，探讨了主要棉区农田土壤地膜残留污染特点和趋势。【方法】本研究采用了两种方法，一是实地调研，对我国主要棉区地膜应用和残留污染特点进行大范围采样，获取第一手数据，二是文献和统计数据收集，对过去几十年中与棉花地膜覆盖技术应用、数据进行整理归纳。【结果】研究结果显示，我国棉花的主产区也从过去的黄河和长江流域迁移到现在的西北内陆地区，其种植面积占全国的70%。新疆等西北内陆地区自1986年开始规模化应用地膜覆盖技术后，棉花单产（皮棉）快速上升，现在已经超过2000 kg/hm2，大幅度超过长江和黄河流域的棉花单产。同时，新疆棉区地膜覆盖应用所带来的残留污染已成为该区域农业可持续发展面临的一个重大问题，新疆连续10年和20年覆膜的棉田土壤中残膜量分别为259.7±36.78 kg/hm2和307.9±35.84 kg/hm2。【结论】因此，地膜覆盖是我国棉花生产格局变化的主要驱动力之一，对保持我国棉花生产的稳定至关重要，但同时棉田地膜残留污染非常严重，必须尽快研究棉田地膜残留污染的应对策略，实现地膜残留污染的有效防控。 [Objectives] Plastic film mulching (PFM) is one of the most widely applied agricultural technology in China, which changes cotton planting distribution and greatly improves the development of cotton industry in China. [Methods] In this study, two methods are adopted: one is large-scale field investigation in the main cotton planting region for plastic residue accumulation and pollution; The other is collection of relative literature and statistics data, and review and analysis the effect of PFM on cotton production in the past decades. [Results] Cotton yield increased sharply to today’s 2000 kg/hm2 in Xinjiang province after wide application of PFM technology, which is much larger than that in the Yangtze or Yellow River basin. Therefore, China’s main cotton planting area has migrated from previous Yangtze and Yellow River basin to today’s Northwest inland region. However, plastic film residue accumulation has become a serious problem and influence sustainable development of cotton industry. Plastic film residue accumulation were 259.7±36.78 kg/hm2和307.9±35.84 kg/hm2 in the soil after 10 and 20 years of PFM application in Xinjiang province, respectively. [Conclusions] Therefore, PFM technique will continue to play a key role to maintain the stability of cotton production, and plastic film pollution will be more and more serious in the future. We must take some powerful actions to control plastic residual pollution derived from PFM in China.