[Objective] To control the content of chlorine ion in cigar wrapper in Hainan by finding out its sources.[Methods] The dynamic variation rule of the chloride ion was studied in the water and fertilizer sources of tobacco fields,soils of different distance from the coastline,various crop stubbles,different soil depth during all the growing period,and different organs of tobacco plants [Results] ①Irrigation and fertilization were not the main source of chlorine ions in cigar wrappers.② The safe distance of tobacco field from the coastline was beyond 10km.③ Residual chlorine ions of different crop stubbles such as bananas,sugar cane,and sweet potato was the major source of chlorine in cigar wrapper ④ The chlorine content showed a declining trend after four consecutive years of chloride ions control with high precipitation in Hainan province.[Conclusion] The high chloride residue of cigar tobacco in Hainan mainly came from the previous cropping soil and a few from the infiltration of the seawater.It was suggested that the safe distance of tobacco cultivation from the coast was more than 10km,and the intake of chlorine-containing fertilizer should be strictly controlled.%[目的]寻找海南茄衣氯离子来源,以求控制烟叶中氯离子含量.[方法]分析研究了烟田水源、肥源、不同海岸线距离土壤、不同作物茬口以及整个生育期内不同土层、烟株不同器官氯离子动态变化规律.[结果]①海南茄衣烟田水源、肥源不是烟叶中氯离子的主要来源;②植烟田距离海岸线的安全距离在l0km以外;③不同茬口作物(如香蕉、甘蔗、红薯)中残留氯离子是茄衣烟田氯的主要来源;④在海南降雨量较大的条件下,连续四年控制烟田氯离子进入,烟叶氯含量呈持续下降趋势.[结论]目前海南雪茄烟叶氯离子来源于前茬作物土壤残留,推测来自少量海水的渗透;建议种烟的安全距离在距离海岸线l0km以上,并严格控制含氯肥料的使用.
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