Effect of fertilizer with low levels of potassium on radiocesium-137 decontamination.
Effect of fertilizer with low levels of potassium on radiocesium-137 decontamination.
复制标题
低钾肥料对放射性铯137净化的影响。
DOI：
10.1007/s12892-018-0054-0
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Yamada M.
中科院分区：
文献类型：
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作者：
Kang DJ;Tazoe H;Ishii Y;Isobe K;Higo M;Yamada M.
钾（K）肥料密切影响Cs污染土壤中植物地上生物量生产和放射性铯-137（137 Cs）的吸收。以纳皮耶草（Pennisetum purpureumSchum.）为材料，研究了低钾对地上生物量、137 Cs浓度和137 Cs去除率（CR）的影响。在低、中、高密度种植条件下，对施钾2 g/m2（20%K）和6 g/m2（60%K）与不施钾（0%K）的试验地进行了比较。结果表明，随着钾肥施用量的增加，纳皮耶草地上生物量呈增加趋势，137 Cs浓度显著降低。最大的CR观察到的阴谋施肥与20%的K和植物生长在高度密集的条件下。CR与生物量呈显著正相关。此外，只有在低施钾水平（0%和20% K）下，CR与137 Cs浓度呈正相关。在本研究中，与不施钾肥相比，施20%钾肥能增加纳皮耶草地上生物量，降低137 Cs浓度的幅度较小，因此，施用低钾肥（如20%钾肥）比施用0%或60%钾肥更有利于137 Cs的净化。
Potassium (K) fertilizer closely affects both above-ground biomass production and radiocesium-137 (137Cs) uptake by plants from Cs-contaminated soil. Here we investigated the effects of low levels of K on aboveground biomass,137Cs concentration, and137Cs removal ratio (CR) using Napier grass (Pennisetum purpureumSchum.). Experimental plots fertilized with either 2 g K (20% K) or 6 g K (60% K) per m2were compared with that with no K fertilization (0% K) under low-, medium-, and high-density planting conditions. As a result, with increasing amounts of K fertilizer, the aboveground biomass of Napier grass tended to increase, and the137Cs concentration significantly decreased. The greatest CR was observed at the plot fertilized with 20% K and with plants grown under highly dense conditions. CR was positively correlated with biomass in all the experimental plots. Moreover, a positive correlation between CR and137Cs concentration was found only at low levels of K application (0% and 20% K). In the present study, the application of 20% K produced more aboveground biomass and smaller decreases in137Cs concentration in Napier grass compared with those with 0% K application; therefore, applying a fertilizer with low levels of K, such as 20% K, is better for137Cs decontamination than applying 0% or 60% K fertilizer.