Phytoextraction of salts by Atriplex nummularia lindl. under water stress in saline sodic soils

作者：de Souza Edivan R^*; Freire Maria B G dos S; do Nascimento Clistenes W A; Montenegro Abelardo A de A; Freire Fernando J; de Melo Hidelblandi F

来源：Revista Brasileira de Engenharia Agricola e Ambiental, 2011, 15(5): 477-483.

• phytoremediation
• halophytes
• salt affected soils

This study aims to evaluate the growth, production and extraction of salts by Atriplex grown on saline-sodic soil under water stress conditions and to compare soil properties before and after their cultivation. The experiment was carried out in a greenhouse during 134 days growing Atriplex nummularia in pots with 20 kg of saline sodic soil with four levels of soil moisture (35, 55, 75 and 95% of field capacity) with a control (soil without plant). The experiment was performed in a randomized block with eight replications. The high concentrations of Ca2+, Mg2+, K+, and especially Na+ and Cl-in leaves of Atriplex nummularia, associated with high dry matter production characterizes this species as phytoextraction of salts, extracting through leaf and stem: 644, 758, 1059 and 1182 kg ha(-1) at 35, 55, 75 e 95% of field capacity, respectively. The variables of the exchangeable cations (Ca2+, Mg2+, K+, sum of bases) and total organic carbon remained stable between the beginning and end of the experiment in all treatments, while Na+ and exchangeable sodium percentage decreased after cultivation of the plant. The Atriplex responded to soil moisture with respect to biomass production and salts extraction.

• 出版日期2011-5