[Phosphorus rhizosphere depletion effect of four aquatic plants].
Four aquatic plants (Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia, Phragmites communis ) were cultured on P-enriched soil in a pot experiment to assess the phosphorus rhizosphere depletion effect and analysis the ratio of root to shoot, root morphology, phosphorus uptake efficiency and phosphorus use efficiency. An obvious variation in P concentration of the soil in the rhizophere and non- rhizophere was observed. Compared with the non-rhizosphere (available P: 167.53 microg x g(-1)), the available P in the rhizosphere soil of Alternanthera philoxeroides, Typha latifolia, Sagittaria sagittifolia and Phragmites communis was reduced to 80.17, 124.37, 155.38 and 161.75 microg x g(-1) respectively, with 81%, 42%, 18% and 16% reduction ratio of water-soluble phosphorus. More effective phosphorus depletion was achieved in Alternanthera philoxeroides by higher phosphorus uptake efficiency (1.32 mg x m(-1)), while rooting system was small and phosphorus use efficiency was low (0.34 g x mg(-1)). Phosphorus uptake efficiency of Typha latjfolia is much lower (0.52 mg x m(-1)) than that of Alternanthera philoxeroides, however, its strong rooting system enhanced soil exploration, with higher phosphorus use efficiency (0.64 g x mg(-1)) and the ratio of root to shoot (0.35). Alternantshera philoxeroides and Typha latfolia were more effective in phosphorus depletion of the rhizosphere soil than that in Sagittaria sagittifolia and Phragmites communis.
Wang
Zhen-yu
ZY
Key Laboratory of Ocean Ecology & Environment, Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China. wang0628@ouc.edu.cn
Wen
Sheng-fang
SF
Xing
Bao-shan
BS
Gao
Dong-mei
DM
Li
Feng-min
FM
Hu
Hong-ying
HY
Sakoda
Akiyoshi
A
Sagehashi
Masaki
M
D027703:Amaranthaceae / Q000378:metabolism; D001673:Biodegradation, Environmental; D019684:Magnoliopsida / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism; D006109:Poaceae / Q000378:metabolism; D034903:Sagittaria / Q000378:metabolism; D012989:Soil Pollutants / Q000378:metabolism*; D013045:Species Specificity; D032401:Typhaceae / Q000378:metabolism; D053833:Wetlands
D012989:Soil Pollutants; D010758:Phosphorus