CAJ | 학술논문

东南景天是一种镉和锌的超积累植物，改变土壤pH能否有效提高其吸收镉的效率，需要进一步验证。采用盆栽实验研究不同土壤pH下东南景天吸收和积累Cd的差异以及对CaCl2提取有效态镉的影响。结果表明，降低土壤pH值显著提高了土壤镉的有效态含量。弱酸性土壤即pH接近5.5时东南景天生物量及累积镉的量最大，土壤镉去除率也最高，达6.6%。强酸性即当pH接近4时，虽然植物地上与地下镉含量均最高，但生物量最小，植物去除率较其他处理低。研究证实降低土壤pH是提高植物提取效率的有效办法，这为进一步利用东南景天修复镉污染土壤，提高修复效率提供了科学依据。
동남경천시일충력화자적초적루식물，개변토양pH능부유효제고기흡수력적효솔，수요진일보험증。채용분재실험연구불동토양pH하동남경천흡수화적루Cd적차이이급대CaCl2제취유효태력적영향。결과표명，강저토양pH치현저제고료토양력적유효태함량。약산성토양즉pH접근5.5시동남경천생물량급루적력적량최대，토양력거제솔야최고，체6.6%。강산성즉당pH접근4시，수연식물지상여지하력함량균최고，단생물량최소，식물거제솔교기타처리저。연구증실강저토양pH시제고식물제취효솔적유효판법，저위진일보이용동남경천수복력오염토양，제고수복효솔제공료과학의거。
Sedum alfredii Hance is an important hyperaccumulator of Cd and Zn , whether adjusting soil pH is an efficient way to enhance metal uptake must by clarified. Different pH levels were designed to measure the CaCl2 extractable soil Cd concentrations and metal concentrations in Sedum alfredii Hance tissue . Results showed that the available metal form of Cd was greatly increased with decreasing pH . Lowering pH significantly influenced plant metal uptake . Highest plant biomass and accumulation of Cd in plant existed at the second lowest soil pH ( 5 . 5 ) , while plant also extract the most total Cd in soil as to 6 . 6% . The highest shoot and root metal concen-tration were at the lowest pH ( 4 . 0 ) , but due to smallest biomass , plant extracted the smallest Cd . Overall , decreasing pH was a useful approach to enhancing the phytoremediation efficiency of Cd contaminated soils by Sedum alfredii Hance .