摘要
为研究喷施不同叶面阻隔剂对北方田间春小麦镉的阻控效果,以'永良4号'为材料,采用田间试验研究方法,于分蘖期、孕穗期向小麦喷施4种不同矿质元素型叶面阻隔剂,分别为混合型(MAC)、锰锌元素型(MZ)、硫元素型(S)、硅元素型(Si),同时设置清水喷施为对照,通过测定小麦各器官镉含量分析不同叶面阻隔剂对小麦镉的阻控效果.结果表明:(1)与清水对照相比较,4种不同矿质元素型叶面阻隔剂均有效降低小麦籽粒中的镉含量,其中,MZ、S处理使籽粒降镉效果显著,4种叶面阻隔剂的降镉能力为MZ＞S＞Si＞MAC,籽粒镉含量分别降低了 47.7％、40.1％、33.3％和26.5％.(2)小麦各器官镉富集系数的表现为根＞茎＞叶＞颖壳＞籽粒,叶面喷施4种矿质元素型阻隔剂后均抑制了小麦籽粒的富集能力,而MAC和MZ处理增加了小麦根部的富集能力,抑制了叶片中镉的累积.(3)MAC和MZ处理阻隔剂抑制了镉从根至茎部的转移,S和Si处理主要抑制叶至籽粒部的镉转运.因此,在通过叶面喷施阻隔剂阻隔小麦镉的污染方面,可以选取喷施MZ型和S型叶面阻隔剂.
Abstract
In order to study the effect of spraying different foliar barrier on the control of cadmium in spring wheat in northern fields,'Yongliang 4'was used as the material,and four different mineral elemental foliar barrier agents were sprayed on wheat at the tillering stage and the spike stage,namely,mixed type(MAC),manganese-zinc elemental type(MZ),sulphur elemental type(S),and silicon elemental type(Si),and the foliar barrier agents were applied at the tillering stage and spike stage,at the same time,water spraying was set as the control,and the blocking and controlling effects of different foliar barrier agents on cadmium in wheat were analyzed by determining the cadmium content in various organs of wheat.The results showed that:(1)Compared with the water control,four different mineral element type of foliar barrier agents effectively reduced the cadmium content in wheat grains,of which,MZ,S treatment made the cadmium reduced in the grains significantly,and the cadmium reduction ability of the four foliar barrier agents was ranked as MZ＞S＞Si＞MAC,which reduced the cadmium content in the grains by 47.7％,40.1％,33.3％and 26.5％,respectively.(2)The Cd enrichment coefficients of various organs of wheat were ranked as root＞stem＞leaf＞glume＞seed,and the foliar spraying of all four mineral-element-based barrier agents inhibited the enrichment ability of wheat seed,while MAC and MZ increased the enrichment ability of wheat root and inhibited the accumulation of Cd in leaves.(3)MAC and MZ barrier agents inhibited cadmium transfer from root to stem,while S and Si treatments mainly inhibited cadmium transport from leaf to seed.Therefore,in terms of blocking Cd contamination in wheat by foliar spraying of barrier agents,spraying of MZ and S types of foliar barrier agents could be selected.
基金项目
财政部和农业农村部国家现代农业产业技术体系(CARS-07)
农业农村部耕地重金属污染防治联合攻关项目()
维普
万方数据