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Background and Aims <p>Soil acidification leads to aluminum (Al) accumulation and threatens forest ecosystem health. Liming is an effective practice to mitigate soil acidification. However, uncertainties regarding plant water use response to acidified soil, Ca amendment and associated mechanisms make it challenging to understand plant ecophysiological strategy in utilizing soil water and nutrients.</p> Methods <p>We conducted a controlled experiment involving simulated soil acidification (Acid) and lime (Ca) amendment in a secondary evergreen forest in South China, aiming to investigate the effects of soil acidification and Ca amendment on water use of dominant <i>Pyrenaria macrocarpa</i> (<i>PM</i>) and <i>Quercus myrsinifolia</i> (<i>QM</i>) and the underlying mechanisms. We collected continuous sap flow data and periodically measured soil properties and plant ecophysiological traits from 2022 and 2023.</p> Results <p>The leaf Al content in <i>Q. myrsinifolia</i> was notably low and recorded at 0.003&#xa0;g&#xa0;m<sup>−2</sup>, while that in <i>P. microcarpa</i> approximated 74.5 times higher, highlighting distinct Al tolerance strategies between the two species. Results showed that the Al-accumulating <i>PM</i> showed higher transpiration under the Acid treatment in the early stage of the experiment but remained similar with CK treatment in the later stage. Whereas, as an Al excluder, <i>QM</i> showed a significantly increase in transpiration (from 18.83% to 27.28%) under Ca treatment during the first three seasons, while remained insensitive to acidification. We attributed the increased transpiration of <i>QM</i> under Ca amendment to the higher leaf specific area, reduced soil exchangeable Al, and increased soil exchangeable Ca, which suggested a potentially economizing strategy of defensive energy budget and tree growth benefits.</p> Conclusions <p>These findings indicated good tolerance of both species to the current acidic environment. Also, it is necessary to consider different Al tolerances of plant species when developing more reasonable management strategies to mitigate acidified forest soil.</p>

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Contrasting tree transpiration of coexisting Al-accumulating Pyrenaria macrocarpa and Al-excluding Quercus myrsinifolia under soil acidification and calcium amendment in South China

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Longwei Lu,
  • Jingyi Wang,
  • Xiuhua Zhao,
  • Lei Gao,
  • Ping Zhao,
  • Lei Ouyang

摘要

Background and Aims

Soil acidification leads to aluminum (Al) accumulation and threatens forest ecosystem health. Liming is an effective practice to mitigate soil acidification. However, uncertainties regarding plant water use response to acidified soil, Ca amendment and associated mechanisms make it challenging to understand plant ecophysiological strategy in utilizing soil water and nutrients.

Methods

We conducted a controlled experiment involving simulated soil acidification (Acid) and lime (Ca) amendment in a secondary evergreen forest in South China, aiming to investigate the effects of soil acidification and Ca amendment on water use of dominant Pyrenaria macrocarpa (PM) and Quercus myrsinifolia (QM) and the underlying mechanisms. We collected continuous sap flow data and periodically measured soil properties and plant ecophysiological traits from 2022 and 2023.

Results

The leaf Al content in Q. myrsinifolia was notably low and recorded at 0.003 g m−2, while that in P. microcarpa approximated 74.5 times higher, highlighting distinct Al tolerance strategies between the two species. Results showed that the Al-accumulating PM showed higher transpiration under the Acid treatment in the early stage of the experiment but remained similar with CK treatment in the later stage. Whereas, as an Al excluder, QM showed a significantly increase in transpiration (from 18.83% to 27.28%) under Ca treatment during the first three seasons, while remained insensitive to acidification. We attributed the increased transpiration of QM under Ca amendment to the higher leaf specific area, reduced soil exchangeable Al, and increased soil exchangeable Ca, which suggested a potentially economizing strategy of defensive energy budget and tree growth benefits.

Conclusions

These findings indicated good tolerance of both species to the current acidic environment. Also, it is necessary to consider different Al tolerances of plant species when developing more reasonable management strategies to mitigate acidified forest soil.