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<p>Thinning is an important forest management measure and would benefit sustainable forest development. However, it is also a great disturbance to forests and disrupts their original balance and thus their response characteristics to the environment. Based on continuous eddy covariance and climatic observations in a subtropical coniferous plantation, this study aimed to clarify the thinning-induced changes in the response of gross primary productivity (GPP) to key environmental factors (net radiation (Rn), air temperature (Ta), vapor pressure deficit (VPD), and soil water content (SWC)). The results indicated that for both pre- and post-thinning, the GPP exhibited an “increase-peak-decrease” response pattern to Rn, Ta and VPD. The GPP was dominated by Rn, and Rn regulated the response of GPP to Ta and VPD to some extent. The direct effects of SWC on GPP were weak and without obvious regularity. Thinning weakened the control effects of environmental factors on GPP. However, we found that thinning increased the response sensitivities of GPP to Rn, Ta and VPD before the response curves reached their peaks, that is, when the environmental factors were lower before the inhibitory effects manifested. After the response peaks, thinning generally alleviated the inhibitory effects of these factors. Although SWC did not have direct effects on GPP, it had potential effects on GPP. Under relatively high SWC conditions, weakened inhibitory effects of VPD on GPP were found after thinning. These results indicated that thinning altered the ecosystem response and may improve the natural resource use efficiency of this subtropical plantation.</p>

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Thinning altered the response of GPP to environmental factors in a coniferous plantation in Southern China

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Shengtong Li,
  • Mingjie Xu,
  • Fengting Yang,
  • Yuting Wang,
  • Jiaxin Song,
  • Baoxin Shan,
  • Ziyi Wang,
  • Huimin Wang,
  • Xianjin Zhu,
  • Chuanpeng Cheng,
  • Jianlei Wang,
  • Tao Zhang

摘要

Thinning is an important forest management measure and would benefit sustainable forest development. However, it is also a great disturbance to forests and disrupts their original balance and thus their response characteristics to the environment. Based on continuous eddy covariance and climatic observations in a subtropical coniferous plantation, this study aimed to clarify the thinning-induced changes in the response of gross primary productivity (GPP) to key environmental factors (net radiation (Rn), air temperature (Ta), vapor pressure deficit (VPD), and soil water content (SWC)). The results indicated that for both pre- and post-thinning, the GPP exhibited an “increase-peak-decrease” response pattern to Rn, Ta and VPD. The GPP was dominated by Rn, and Rn regulated the response of GPP to Ta and VPD to some extent. The direct effects of SWC on GPP were weak and without obvious regularity. Thinning weakened the control effects of environmental factors on GPP. However, we found that thinning increased the response sensitivities of GPP to Rn, Ta and VPD before the response curves reached their peaks, that is, when the environmental factors were lower before the inhibitory effects manifested. After the response peaks, thinning generally alleviated the inhibitory effects of these factors. Although SWC did not have direct effects on GPP, it had potential effects on GPP. Under relatively high SWC conditions, weakened inhibitory effects of VPD on GPP were found after thinning. These results indicated that thinning altered the ecosystem response and may improve the natural resource use efficiency of this subtropical plantation.