Pedosphere 12(2): 103--110, 2002
ISSN 1002-0160/CN 32-1315/P
©2002 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Uptake of organic phosphorus by arbuscular mycorrhizal red clover |
| SONG Yong-Chun1, LI Xiao-Lin1 and P. CHRISTIE2 |
1 Department of Plant Nutrition, College of Agricultural Resources and Environmental Sciences, China Agricultuml University, Beijing 100094 (China);
2 Department of Agricultural and Environmental Science, The Queen's University of Belfast, Newforge Lane Belfast, BT9 5PX (LIK) |
| ABSTRACT |
| The capacities of two arbuscular mycorrhizal (AM) fungi, Glomus mosseae and Glomus versderme, tomineralize added organic P were studied in a sterilized calcareous soil. Mycorrhizal (inoculated with either of the AM fungi) and non-mycorrhizal red clover (Trghlium pmtense L.) plants were grown for eight weeksin pots with upper root, central hyphal and lower soil compartments. The hyphal and soil compartmentsreceived either organic P (as Na-phytate) or inorganic P (as KH2PO4) at tbe rate of 50 mg P kg-1. No P wasadded to the root compartments. Control pots received no added P. Yields were higher in mycorrhizal than innon-mycorrhizal clover. Mycorrhizal inoculation doubled shoot P concentration and more than doubled total P uptake of plaflts in P-amended soil, irrespective of the form of applied P. The mycorrhizal contributionto inorganic P uptake was 80% or 76% in plants inoculated with G. mosseae or G. verefforme, respectively. Corresponding values were 74% and 82% when Na-phytate was applied. In the root compartments of the mycorrhizal treatments, the proportion of root length infected, hyphal length density and phosphatase activity were all higher when organic P was applied than when inorganic P was added. |
| Key Words: arbuscular pcorrhiza, organic P, P uptake, red clover |
| Citation: Song, Y. C., Li, X. L. and Christie, P. 2002. Uptake of organic phosphorus by arbuscular mycorrhizal red clover. Pedosphere. 12(2): 103-110. |
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