Relationship between rhizosphere acidification and phytoremediation in two acacia species
Relationship between rhizosphere acidification and phytoremediation in two acacia species
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DOI：
10.1007/s11368-014-1051-9
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发表时间：
2016-04-01
影响因子：
3.6
通讯作者：
Hussain, Amjad
中科院分区：
文献类型：
--
作者：
Abbas, Ghulam;Saqib, Muhammad;Hussain, Amjad
植物修复是盐渍土壤复垦最可持续、最经济的策略。为了研究植物修复与根际酸化的关系，以两种相思树为材料，进行了温室和田间试验。在温室实验中，这两种植物在溶液培养中分别暴露于100 mM和200 mM盐浓度下。盐处理14天和28天后，测定植物根部有机酸的释放量。收获植株后，测定地上部和根灰碱度。在田间试验中，这两个物种都在盐碱地上种植了2年。每隔6个月记录一次植物生长数据，并从不同土壤深度采集土壤样品进行理化分析。温室研究结果表明，在柠檬酸、苹果酸和酒石酸的释放以及灰分碱度方面，放大沙打旺的根际酸化程度高于尼罗罗非沙打旺。田间试验结果表明，在pH(S)、Ece、SAR、容重、入渗速率等土壤性质方面，放线菌较尼罗罗铁有更大的改善作用，因此，由于其较高的根际酸化潜力，因此更适合盐害土壤的植物修复。
Phytoremediation is the most sustainable and economical strategy for reclamation of the salt-affected soils. In order to investigate the relationship between phytoremediation and rhizosphere acidification, two experiments (greenhouse and field) were conducted using two acacia species viz. Acacia ampliceps and Acacia nilotica.In greenhouse experiment, both the species were exposed to 100 and 200 mM NaCl concentrations in solution culture. The release of organic acids from plant roots was determined after 14 and 28 days of the salt treatment. Shoot and root ash alkalinity was determined after harvesting the plants. In field experiment, both the species were grown on a saline sodic soil for 2 years. After every 6 months, plant growth data were recorded and soil samples were collected from different soil depths for physicochemical analyses.The results of greenhouse study indicated higher rhizosphere acidification by A. ampliceps than A. nilotica in terms of release of citric acid, malic acid, and tartaric acid along with ash alkalinity. The comparison of both the species in the field indicated higher amelioration in the soil properties like pH(s), ECe, SAR, bulk density, and infiltration rate by A. ampliceps than A. nilotica.It is concluded from these studies that A. ampliceps is more suitable species than A. nilotica for the phytoremediation of the salt-affected soils due to its higher rhizosphere acidification potential.