Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China.
Chemosphere. 2019 Apr;221:342-348. doi: 10.1016/j.chemosphere.2019.01.059. Epub 2019 Jan 9.
There have been no studies demonstrating the correlation between soil nutrient heterogeneity and cadmium (Cd) absorption of Bermudagrass. In this study, a pot experiment was carried out to study the correlation between them. The purpose is to find soil nutrient factors which are conducive to improving the Cd absorption and translocation. The eighth group had the largest total number of surviving plants, the highest Fv/Fo value (3.24) and the best growth characteristics. The fifth group had the lowest total number of surviving plants, Fv/Fo (2.47) and the worst growth. The Cd content of the fifth group (36.11 mg kg) was close to the eighth group (35.72 mg kg), but the two groups had significant differences in plant height, stem node length and stem node number (P < 0.05). The eighth group showed the highest contents of nitrate nitrogen (NO-N), available potassium and urease activity. The fifth group showed the lowest NO-N content, but the highest ammonium nitrogen (NH-N) and available phosphorus content. There was significant difference of the Cd bioconcentration factors (BCF) and translocation factor (TCF) between the fifth and the eighth group although they had the similar total soil Cd content (P < 0.05). The fifth group had the highest BCF and TCF. RDA analysis indicated the BCF and TCF were positively correlated with soil NH-N and available phosphorus and negatively correlated with soil NO-N. The results demonstrated that soil NH-N and available phosphorus were important soil ecological factors to enhance Cd absorption and translocation of bermudagrass.
尚未有研究表明土壤养分异质性与狗牙根对镉（Cd）的吸收之间存在相关性。本研究通过盆栽实验来研究两者之间的相关性。目的是找到有利于提高 Cd 吸收和转运的土壤养分因素。第八组的存活植物总数最多，Fv/Fo 值最高（3.24），生长特性最好。第五组的存活植物总数最少，Fv/Fo 值最低（2.47），生长情况最差。第五组的 Cd 含量（36.11 mg kg）接近第八组（35.72 mg kg），但两组在株高、茎节点长度和茎节点数量方面存在显著差异（P < 0.05）。第八组的硝酸盐氮（NO-N）、有效钾和脲酶活性最高。第五组的 NO-N 含量最低，但铵态氮（NH-N）和有效磷含量最高。尽管第五组和第八组的总土壤 Cd 含量相似，但第五组和第八组的 Cd 生物浓缩系数（BCF）和转运系数（TCF）存在显著差异（P < 0.05）。第五组的 BCF 和 TCF 最高。RDA 分析表明，BCF 和 TCF 与土壤 NH-N 和有效磷呈正相关，与土壤 NO-N 呈负相关。结果表明，土壤 NH-N 和有效磷是增强狗牙根对 Cd 吸收和转运的重要土壤生态因素。
