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矿区农田高低镉水稻品种响应农艺措施差异及其降镉效果

Differences in the responses of high and low Cd accumulating rice cultivars to agronomic measures and their Cd mitigation effects in mining area paddy fields

  • 摘要: 为明确矿区Cd污染稻田中高、低Cd积累水稻品种对不同农艺措施的响应差异及降Cd效果,通过田间试验,以隆两优1988(高Cd品种,H)和臻两优8612(低Cd品种,L)为材料,设置生石灰(T1)、土壤调理剂(T2)、叶面阻控剂(T3)、功能微生物菌剂(T4)、肥料配伍(T5)及对照(CK)处理,分析土壤有效态金属、植株Cd积累及转运特征。结果表明:T1和T2均显著提高两品种种植土壤pH,但对土壤DTPA-Cd的降低作用总体有限,仅分蘖期L品种T2处理的DTPA-Cd含量较CK显著降低20%。成熟期,L品种T2处理使根系Cd含量显著降低44.6%;T4和T5处理使籽粒Cd含量分别降低62.4%和57.4%,且根系向籽粒Cd转运系数分别降低60.0%和47.2%。相比之下,H品种部分处理出现Cd积累增加现象,其中T3处理使根系Cd含量增加105%,T5处理使籽粒Cd含量增加56.1%。不同处理下L品种籽粒Cd含量总体显著低于H品种,表明农艺措施的降Cd效果具有明显的品种差异。综上,水稻基因型是影响矿区稻田Cd积累及农艺措施降Cd效果的重要因素,低Cd品种臻两优8612配施功能微生物菌剂或采用肥料配伍,可进一步降低籽粒Cd积累,为矿区Cd污染稻田低Cd品种筛选及农艺措施精准配套提供依据。

     

    Abstract: To clarify the differences in the responses of high and low Cd accumulating rice cultivars to different agronomic measures and their Cd mitigation effects in Cd contaminated paddy fields in mining areas, a field experiment was conducted using Liangliangyou 1988 (a high Cd accumulating cultivar, H) and Zhenliangyou 8612 (a low Cd accumulating cultivar, L) as the experimental materials. Six treatments were established: quicklime (T1), soil conditioner (T2), foliar Cd immobilization agent (T3), functional microbial inoculant (T4), fertilizer combination management (T5), and control (CK). Soil available metal concentrations, Cd accumulation in rice plants, and Cd translocation characteristics were analyzed. The results showed that T1 and T2 significantly increased soil pH in both cultivars, but their overall effects on reducing soil DTPA extractable Cd were limited. Only T2 significantly reduced DTPA Cd concentration by 20% compared with CK in the L cultivar at the tillering stage. At maturity, T2 significantly reduced root Cd concentration in the L cultivar by 44.6%. T4 and T5 reduced grain Cd concentration by 62.4% and 57.4%, respectively, and decreased the Cd translocation factors from roots to grains by 60.0% and 47.2%, respectively. In contrast, some treatments increased Cd accumulation in the H cultivar. Specifically, T3 increased root Cd concentration by 105%, while T5 increased grain Cd concentration by 56.1%. Across different treatments, grain Cd concentrations in the L cultivar were generally significantly lower than those in the H cultivar, indicating clear cultivar differences in the Cd mitigation effects of agronomic measures. Overall, rice genotype is an important factor affecting Cd accumulation in mining area paddy fields and the Cd mitigation effects of agronomic measures. Combining the low Cd accumulating cultivar Zhenliangyou 8612 with a functional microbial inoculant or adopting fertilizer combination management can further reduce grain Cd accumulation, providing a basis for screening low Cd rice cultivars and the precise matching of agronomic measures in Cd contaminated paddy fields in mining areas.

     

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