镉污染大田条件下不同品种水稻镉积累的特征及影响因素  

Characteristics and Influencing Factors of Cadmium Accumulation in Different Rice Varieties Under Cadmium Contaminated Field Conditions

作　　者：王宇豪 杨力 康愉晨 陈小红 彭杰 李佳欣 陈文清[1] WANG Yu-hao;YANG Li;KANG Yu-chen;CHEN Xiao-hong;PENG Jie;LI Jia-xin;CHEN Wen-qing(College of Architecture&Environment,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学建筑与环境学院,成都610065

出　　处：《环境科学》2021年第11期5545-5553,共9页Environmental Science

基　　金：四川省重大科技专项项目(2018SZDZX0028)。

摘　　要：选取适合当地种植的8个水稻品种为试验对象,开展大田试验,比较不同品种水稻对重金属Cd的积累、吸收和转运特征,筛选出适合当地种植的Cd低累积水稻品种,并分析水稻低累积程度及稳定性影响因素.结果表明:①根据综合积累指数(P_(N))评价方法筛选出对Cd综合积累能力低的水稻品种有:川优3203、川优6203、德粳6号和沈优17.②综合考虑稻米Cd含量和产量,适合在该地区种植的水稻品种为川优3203和川优6203,既能安全保障稻米Cd含量,又能保证水稻高产.③川优3203和川优6203在不同pH和不同总镉范围内稻米中Cd含量均显著低于其他品种,且在不同土壤条件下表现得很稳定.④水稻品种的差异对水稻的稻米富集能力有较大的影响,而对水稻茎叶向水稻稻米的转运能力的影响较小;川优3203和川优6203的低富集系数,加之其较低的转运,最终呈现出稻米较低的镉富集能力.⑤相关性分析发现,稻米Cd含量受水稻富集系数影响最大,受根际土壤总Cd含量影响最小.Eight rice varieties suitable for local cultivation were selected and field tests were carried out to compare the accumulation,absorption,and transport characteristics of Cd.The rice varieties with low Cd accumulation were screened,and the factors affecting the accumulation degree and stability of rice were analyzed.The results showed that:①According to the comprehensive accumulation index(P_(N))evaluation method,the rice varieties with low PN ability for Cd were selected as follows:Chuanyou 3203,Chuanyou 6203,Dejing 6,and Shenyou 17.②Considering the Cd content and yield of rice,Chuanyou 3203 and Chuanyou 6203 are suitable for planting in this region,which guarantees a safe Cd content in and high yield of rice.③The contents of Cd in Chuanyou 3203 and Chuanyou 6203 were significantly lower than those of other rice varieties and stable under different pH and total Cd ranges and soil conditions.④The difference between rice varieties had a significant effect on rice enrichment ability,but little effect on translocation from stem to leaf.The low enrichment coefficient of Chuanyou 3203 and Chuanyou 6203,combined with low translocation,demonstrated the low Cd enrichment capacity of rice.⑤Correlation analysis showed that the Cd content was most affected by the enrichment coefficient of rice,and least affected by the total Cd content of rhizosphere soil.

关 键 词：大田 水稻品种 镉积累 积累特征 筛选 

分 类 号：X171.5[环境科学与工程—环境科学]