【摘要】 【目的】研究油菜的根系形态与镉铅累积特征,分析油菜植株镉铅含量、累积量与根系形态间的关系。【方法】以云南铅锌矿周边镉铅污染的原状农田土壤为供试基质,采用根箱种植云南主栽的9个油菜品种。【结果】(1)油菜根体积和根尖数品种间的差异较大,根长和根表面积差异较小。(2)油菜地上部和地下部的铅含量与累积量品种间的差异较大,地下部镉含量品种间的差异较大,而地上部镉含量、地上部和地下部镉累积量品种间的差异较小。(3)油菜根体积与地上部铅累积量呈显著正相关,根尖数与地上部、地下部镉含量呈极显著正相关。(4)根际有效态铅含量与油菜地下部铅含量、累积量呈极显著和显著正相关,根际有效态镉含量与油菜地上部镉累积量呈显著负相关。【结论】油菜根体积和根尖数存在明显的品种差异,并与油菜镉含量、铅累积量的关系密切。更多还原

【Abstract】 [Purpose]To study the root morphology and Cd/Pb accumulation characteristics, and analyze their relationship.[Method]Nine rape varieties widely cultivated in Yunnan Province were cultivated in a rhizobox filled with heavy metals-polluted soils from a farmland in a lead-zinc mining area of Yunnan Province under a greenhouse condition.[Results](1) There was a big difference between the nine varieties on the root volume and tips number, and a small difference on root length and surface area.(2) The difference is obvious on the Pb content and accumulation in the aboveground and underground part between the nine varieties, and on the Cd content in the underground part; and the difference is small on the Cd content in the aboveground part and the Cd accumulation in the aboveground and underground part.(3) A significant positive correlation between root volume and the Pb accumulation in aboveground part, and very significant positive correlations between root tip and the Cd content in aboveground and underground part were found.(4) There were very significant and significant positive correlations between the available Pb concentration in the rhizosphere with the Pb content and accumulation in the underground part of rape; and a significant positive correlation between the available Cd concentration in the rhizosphere and the Cd accumulation in the aboveground part of rape.[Conclusion]There was a notable difference on root volume and tips number,which had a close relationship with Cd content and Pb accumulation in the nine rape varieties.更多还原