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(INRA, UMR Eco&Sols, France) (CIRAD, UMR Eco&Sols, France) (CIRAD, UMR Eco&Sols, France) (INRA, UMR Eco&Sols, France) (IRD, UMR Eco&Sols, France) (INRA, UMR Eco&Sols, France)
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한국토양비료학회 한국토양비료학회 학술발표회 초록집 20th WORLD CONGRESS OF SOIL SCIENCE
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    초록·키워드

    Productive eucalypt forests are generally planted in nutrient-poor soils such as sandy savannas. These trees are fast-growing woody species harvested every six-to-seven year intervals. Therefore, these eucalypt plantations often deplete soil macronutrients, such as N and P. In order to increase nitrogen (N) inputs in forest ecosystem, the N-fixing tree species acacia (Acacia mangium) was intercropped in eucalypt plantations in Congo. Increasing N availability in these sandy, nutrient-poor soils, could also change the bioavailability of organic P pool and low molecular weight organic acids (LMWOAs) via the modification of litter decomposition rate and the microbial activity, which release LMWOAs. Field measurements showed that the biological N fixation increased the productivity of eucalyptus trees in mixed-species plantations, indicating that N fixation was high in these environmental conditions. To investigate the effects of acacia on P cycling in these intercropped systems, we used first high performance ion chromatography to separate and quantify organic P and LMWOAs in soil from different types of plantation: pure stand of acacia, pure stand of eucalyptus and the mixture of the two species. Besides mineral anions, we were able to separate and to iden ... 전체 초록 보기

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