Premium
Mobilisation of inorganic phosphorus induced by rice straw in aggregates of a highly weathered upland soil
Author(s) -
Ding Longjun,
Wu Jinshui,
Xiao Heai,
Zhou Ping,
Syers J Keith
Publication year - 2011
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.4717
Subject(s) - phosphorus , microorganism , straw , chemistry , bacteria , nutrient , rice straw , biomass (ecology) , environmental chemistry , agronomy , biology , organic chemistry , inorganic chemistry , genetics
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. Copyright © 2011 Society of Chemical Industry