Differences in remediation effect of 137Cs in Napiergrass (Pennisetum purpureum Schum.) under different land-use soil and cutting frequency conditions
Differences in remediation effect of 137Cs in Napiergrass (Pennisetum purpureum Schum.) under different land-use soil and cutting frequency conditions
复制标题
不同土地利用土壤和刈割频率条件下龙血草(Pennisetum purpureum Schum.)中137Cs修复效果的差异
DOI：
10.1007/s11270-014-2022-x
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Y. Ishii
中科院分区：
文献类型：
--
作者：
Kang;D.-J.;H. Tazoe;M. Yamada;Y. Ishii
本研究报道了放射性铯-137（137 Cs）的修复使用狼尾草在福岛县的铯污染土壤。采用两种不同的采伐频率（每年采伐一次或两次），对两种不同土地利用方式的土壤（低地和高地）进行了田间试验，考察了采伐对土壤修复效果的影响。高地土壤中的植物生长量显著大于低地土壤。高地土壤的地上部分137 Cs浓度（Bq kg− 1干重）和总Cs去除率（CR）也显著高于低地土壤。在低地土壤中，一年两次刈割（移栽后12周和24周）的CR比一年一次刈割（18周）的CR更有效（P< 0.01）;而在高地土壤中，由于第二次刈割对植株的遮光作用，与刈割差异相关的CR没有显著差异。在本研究中，地上干物质重与CR在这两个领域都高度相关。考虑到增加单位土地植物数量以增加单位土地地上生物量的可能性，在广泛的Cs污染土壤中，潜在的Cs修复效果可能比本研究中证明的狼尾草对Cs吸收的潜力大得多。
The present study reports the remediation of radiocesium-137 (137Cs) using napiergrass in Cs-contaminated soils of Fukushima Prefecture. Two field experiments were performed to examine the remediation effects in two different land-use soils (lowland and upland soils) using two different cutting frequencies (cut once or twice a year). Plant growth in the upland soil was significantly greater than that in the lowland soil. The137Cs concentration (Bq kg−1dry weight basis) in the aboveground parts and total Cs-removal ratio (CR) in the upland soil were also significantly higher than those in the lowland soil. In the lowland soil, cutting twice a year [at 12 and 24 weeks after transplanting (WAT)] was more effective for CR (P< 0.01) than cutting once a year (18 WAT); however, there was no significant difference of CR related to cutting difference in the upland soil as a result of the shading effect on the plants at second cutting. In the present study, aboveground dry matter weight was highly correlated with CR in both fields. Given the possibility to increase plant number per unit of land to increase aboveground biomass per unit of land, the potential Cs remediation effect could be much greater in a wide range of Cs-contaminated soils than the potential of napiergrass for Cs uptake demonstrated in the present study.