[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.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. wang0628@ouc.edu.cn
Zhen-yu
ZY
Wang
Sheng-fang
SF
Wen
Xian-xiang
XX
Luo
Ai-feng
AF
Li
Bao-shan
BS
Xing
Feng-min
FM
Li
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