Phosphorus Dissolution in the Rhizosphere of Bald Cypress Trees in Restored Wetland Soils

摘要: Phosphorus release to ground or surface waters has been observed in wetlands restored from farmland. This study examined whether rhizospheres of bald cypress (Taxodium distichum L.) are a source increased P dissolution compared with the soil matrix. The was conducted root-box rhizotrons filled mineral and organic materials (Aeric Alaquods Terric Haplosaprists, respectively) Carolina bay wetland row crop agriculture. Rhizotrons were planted saplings left unplanted simulate rhizosphere matrix conditions, respectively. Ponding imposed for 128 d. Soil pore water sampled three layers (0–22, 22–41, 41–59 cm) each rhizotron twice monthly dissolved total reactive P, C (DOC), Fe²⁺, redox potential (Eh). Manual root counts monitored growth death monthly. Root most prevalent at 41 59 cm, while vigorous near surface. treatments exhibited Fe²⁺ concentrations DOC relative conditions; however, no corresponding increase occurred. Near surface, declined below after 60 d ponding. Our results show that did not cause higher than values soils 3.5 19.5% C, In addition, resulted more oxidizing conditions and/or plant uptake which decreased values.