Effects of 9 years of continuous field phosphorus fertilization on adsorption of dissolved organic matter in tropical forest soil

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  • Mori Taiki
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences Kyushu Research Center, Forestry and Forest Products Research Institute, FFPRI
  • Lu Xiankai
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences
  • Wang Cong
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences University of Chinese Academy of Sciences
  • Mao Qinggong
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences
  • Wang Senhao
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences University of Chinese Academy of Sciences
  • Zhang Wei
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences
  • Mo Jiangming
    Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences

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<p>For many years, there has been a prevailing belief that the activity of soil microorganisms in tropical forests is limited by the availability of phosphorus (P). This belief has traditionally found support in experimental research, consistently demonstrating that the addition of P leads to an increase in heterotrophic soil respiration. However, we have introduced an alternative hypothesis that challenges this conventional perspective. Our proposition suggests that the evidence traditionally utilized to substantiate this belief is, in fact, an outcome of increased carbon (C) availability resulting from abiotic processes initiated by the release of organic matter from soil mineral surfaces, which occurs as a consequence of P addition. Indeed, our previous study has empirically established two significant findings: (i) the acceleration of soil respiration through P fertilization, accompanied by the absence of concurrent stimulation in litter decomposition, and (ii) the immediate increase in extracted DOC resulting from the laboratory introduction of P prior to extraction. In the present study, we have expanded upon the existing body of evidence by providing field-based support that soils subjected to P fertilization display a reduced ability to adsorb newly introduced DOC. The prolonged period of 9 years of continuous fertilization tended to diminish the adsorption capacity of experimentally added DOC, which probably facilitated the acquisition of C by soil microorganisms and thus contributed to the stimulation of soil respiration in our study site. Building upon our previous findings, we propose that the traditionally used evidence to substantiate microbial P limitation is, in fact, a consequence of abiotically increased C availability resulting from P addition.</p>

収録刊行物

  • Tropics

    Tropics 32 (2), 95-100, 2023-12-01

    日本熱帯生態学会

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