[目的]为探究3种糯高粱生长及其对镉污染农田土壤中的镉吸收移除效果.[方法]选用"川糯粱1号"、"兴湘粱2号"和"晋糯梁5号"为实验材料,以休耕为对照,采用"一种两收"种植方式,研究3种糯高粱的生长和镉吸收差异及其对土壤养分和镉含量的影响.[结果]兴湘梁2号的两季秸秆生物量最高(19461.0 kg hm-2),其次为晋糯梁5号(19143.5 kg hm-2),川糯梁1号最低(18982.5 kg hm-2).兴湘梁2号的两季籽粒产量最高(11887.0 kg hm-2),其次为川糯粱1号(11527.5 kg hm-2),晋糯梁5号最少(10929.5 kg hm-2).兴湘梁2号秸秆和籽粒镉吸收量分别为15342.0 mg hm-2和186.0 mg hm-2,其秸秆两季镉吸收量显著高于川糯粱1号和晋糯梁5号.3种糯高粱品种头季和再生季植株镉含量、土壤pH值和有效镉含量均无显著差异.[结论]在镉轻度污染农田中,"一种两收"的糯高粱种植方式是可复制可推广的模式,可为区域重金属污染土壤治理提供技术支撑;另外,兴湘梁2号是本地区更适宜推广的糯高粱品种.
Comparative Study on the Growth and Cadmium Absorption of Three Glutinous Sorghum Varieties under"A Two-Harvests"
[Objective]The purpose of this study was to investigate the absorption and removal effects of three kinds of glutinous sorghum on cadmium-polluted paddy soil.[Method]"Chuannuo1iang1(CCN-1)","Xingxiangliang 2(XXL-2)"and"Jinnuoliang 5(JNL-5)"were selected as experimental materials.The differences of cadmium absorption in growth and above-ground parts of three kinds of glutinous sorghum and their effects on soil nutrients and soil cadmium content were studied by using"A Two-Harvests"planting method with fallow as control.[Results]The results showed that the annual straw biomass of XXL-2 was the highest(19,461.0 kg hm-2),followed by JNL-5(19,143.5 kg hm-2)and CNL-1 was the lowest(18,982.5 kg hm-2).The annual grain yield of XXL-2 was the highest(11887.0 kg hm-2),followed by CNL-1(11527.5 kg hm-2)and JNL-5 was the lowest(10929.5 kg hm-2).The cadmium absorption of straw and grain of XXL-2 was 15342.0 mg hm-2 and 186.0 mg hm-2,respectively.The annual cadmium absorption of straw of XXL-2 was significantly higher than that of CNL-1 and JNL-5.There were no significant differences in Cd content,soil pH and available Cd content between the first and regenerated seasons of 3 glutinous sorghum varieties.[Conclusion]The results showed that the planting mode of glutinous sorghum with"A Two-Harvests"in slight cadmium-polluted paddy fields was a reproducible and popularizing management mode,which could provide technical support for regional heavy metal control.In addition,xxl-2 was a more suitable variety for promotion in this area.
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