Mobilisation of inorganic phosphorus induced by rice straw in aggregates of a highly weathered upland soil

被引:23
作者
Ding, Longjun [1 ]
Wu, Jinshui [1 ]
Xiao, Heai [1 ]
Zhou, Ping [1 ]
Syers, J. Keith [2 ]
机构
[1] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China
[2] Naresuan Univ, Fac Agr Nat Resources & Environm, Phitsanulok 65000, Thailand
关键词
soil aggregates; highly weathered soil; phosphorus immobilisation; bacteria; fungi; microbial inhibitors; MICROBIAL BIOMASS PHOSPHORUS; ORGANIC PHOSPHORUS; SUBTROPICAL SOIL; FRACTIONS; CARBON; TRANSFORMATIONS; SOLUBILIZATION; BACTERIAL; DYNAMICS; NITROGEN;
D O I
10.1002/jsfa.4717
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
BACKGROUND: Microorganisms mediate biochemical transformations of phosphorus (P) in soil. This is of particular importance in highly weathered soils, which are usually P deficient. This study aimed to extend understanding of the separate role of bacteria and fungi in P transformations in aggregates of a highly weathered soil, by adding P-stripped rice straw and microorganism inhibitors to aggregates. RESULTS: The amount of microbial biomass phosphorus (MB-P) in the treatment with rice straw alone increased by over two-fold during 16 days. At the end of 28 d, the amount of inorganic-P in Fe-, Al-, and Ca-bound fractions decreased, whilst the amount of organic-P increased substantially (P < 0.01). The effect of bacterial inhibitors (tetracycline and streptomycin sulphate) on P immobilisation was very small in the early phase (0-4 d), but became pronounced after 8 days, whilst the fungal inhibitor (actidione) initially caused a decrease in P immobilisation by about 60%, but had no effect after that. CONCLUSION: Fungi and bacteria immobilise P in soil aggregates, with fungi being responsible initially. However, bacteria become dominant subsequently and immobilise P from the inorganic fractions. (C) 2011 Society of Chemical Industry
引用
收藏
页码:1073 / 1079
页数:7
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