[In situ dynamics of phosphorus in the rhizosphere solution and organic acids exudation of two aquatic plants].
A mini-rhizotron experiment with Alternanthera philoxeroides and Typha latifolia was conducted to measure the spatial and temporal dynamics of phosphorus in the rhizosphere solution. The organic acids in the in situ rhizosphere soil solution were analyzed. A decreasing phosphorus concentration gradient in soil solution toward the root was observed for both A. philoxeroides and T. latifolia. The phosphorus concentration in the rhizosphere soil solution of A. philoxeroides (2.53 mg x L(-1)) was lower than that of T. latifolia (5.43 mg x L(-1)) in the forth sampling day. Compared to T. latifolia, A. philoxeroides released more malic acid (27.33 umol x L(-1)) which was more efficient in phosphorus mobilization. A. philoxeroides was more effective in phosphorus uptake in the rhizosphere than T. latifolia.
Wang
Zhen-yu
ZY
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. wang0628@ouc.edu.cn
Wen
Sheng-fang
SF
Luo
Xian-xiang
XX
Li
Ai-feng
AF
Xing
Bao-shan
BS
Li
Feng-min
FM
D027703:Amaranthaceae / Q000378:metabolism*; D001673:Biodegradation, Environmental; D005618:Fresh Water / Q000032:analysis; D008293:Malates / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism*; D027343:Rhizome / Q000378:metabolism; D032401:Typhaceae / Q000378:metabolism*
D008293:Malates; D010758:Phosphorus; C030298:malic acid