为探究桑树品种间重金属镉的分布与富集规律，选择‘农桑14号’、‘强桑1号’、‘粤桑11号’3个桑品种，并设置15000株/hm2、30000株/hm2、45000株/hm2的栽植密度在镉超标农田上开展试验。根据样品检测与统计分析的结果得出：从土壤中吸收的镉50%左右分布在桑树根部，其次为分枝、主茎和叶，桑树品种与栽植密度及其互作对各取样部位（除桑叶外）的镉总量均有显著影响。在镉含量为2.93 mg/kg的农田中，15000株/hm2栽植模式下的‘粤桑11号’品种富集镉能力最强。桑树对镉的富集系数为0.107，桑树对镉的转移系数为0.243，两者均不受桑树品种与栽植密度及其互作的影响。
Abstract
In order to identify the distribution and enrichment regularity of cadmium among different mulberry varieties, ‘Nongsang 14’, ‘Qiangsang 1’ and ‘Yuesang 11’ were planted on cadmium-excessive farmlands with the density of 15000, 30000 and 45000 plants/hm2. According to the results of sample testing and statistical analysis, about 50% of the cadmium absorbed from the soil was distributed in mulberry root, followed by that in branches, stems and leaves, respectively. The cadmium distribution in the sampling parts (except for the leaves) was significantly affected by the mulberry variety, planting density and their interaction. ‘Yuesang 11’ planted on the farmland with cadmium concentration of 2.93 mg/kg and planting density of 15000 plants/hm2 had the strongest enrichment capability. In addition, the cadmium enrichment coefficient (EC) of mulberry was 0.107, and the cadmium transfer factor (TF) of mulberry was 0.243, both were insusceptible to the mulberry variety, planting density and their interaction.
关键词
桑树品种；栽植密度；镉超标农田；镉的分布；富集规律
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Key words
mulberry variety; planting density; cadmium exceeded farmland; cadmium distribution; enrichment regularity
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