Scholarlink

Background and Aims <p>The forest fires in the Daxing’an Mountains occurred at different times, resulting in secondary birch (<i>Betula platyphylla</i>) forests of different stand ages. However, the soil respiration dynamics and component responses of birch forests of varying ages remain poorly understood and quantified.</p> Methods <p>During the growing season from 2022 to 2024, we investigated and measured the soil respiration and its components, as well as the influencing factors, of birch forests in the Daxing’an Mountains, China at three age gradients (30&#xa0;yr, 45&#xa0;yr, and 66&#xa0;yr) using the trench method.</p> Results <p>The results showed that the average total soil respiration (Rs) in the birch forests of this region ranged from 334.79–436.80&#xa0;mg·m<sup>−2</sup>&#xa0;h<sup>−1</sup>, with the order of 45&#xa0;yr &gt; 66&#xa0;yr &gt; 30&#xa0;yr. The average soil heterotrophic respiration (Rh) ranged from 211.50–303.05&#xa0;mg·m<sup>−2</sup>&#xa0;h<sup>−1</sup>, with the order of 66&#xa0;yr &gt; 45&#xa0;yr &gt; 30&#xa0;yr. The average soil autotrophic respiration (Ra) ranged from 100.01–166.21&#xa0;mg·m<sup>−2</sup>&#xa0;h<sup>−1</sup>, with the order of 45&#xa0;yr &gt; 66&#xa0;yr &gt; 30&#xa0;yr. Rh/Rs ranged from 61.79%-75.26%, and Ra/Rs ranged from 24.74%-38.21%. Soil temperature (Ts) and soil dissolved organic carbon (DOC) significantly affected both Rs and Rh, while soil volumetric water content (VWC) only significantly influenced Rs.</p> Conclusions <p>Our study reveals the patterns of changes in soil respiration over stand age and its components during the succession of birch forests, providing scientific basis for assessing the carbon dynamics of forest ecosystems at different developmental stages.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Variations and driving factors of soil respiration components over stand age in boreal birch forests in China

  • 期刊论文

  • 发表日期：

    2026年1月29日

查看全文
  • Minglei Gao,
  • Xiuling Man,
  • Qiaojuan Liu,
  • Tijiu Cai,
  • Changhui Peng

摘要

Background and Aims

The forest fires in the Daxing’an Mountains occurred at different times, resulting in secondary birch (Betula platyphylla) forests of different stand ages. However, the soil respiration dynamics and component responses of birch forests of varying ages remain poorly understood and quantified.

Methods

During the growing season from 2022 to 2024, we investigated and measured the soil respiration and its components, as well as the influencing factors, of birch forests in the Daxing’an Mountains, China at three age gradients (30 yr, 45 yr, and 66 yr) using the trench method.

Results

The results showed that the average total soil respiration (Rs) in the birch forests of this region ranged from 334.79–436.80 mg·m−2 h−1, with the order of 45 yr > 66 yr > 30 yr. The average soil heterotrophic respiration (Rh) ranged from 211.50–303.05 mg·m−2 h−1, with the order of 66 yr > 45 yr > 30 yr. The average soil autotrophic respiration (Ra) ranged from 100.01–166.21 mg·m−2 h−1, with the order of 45 yr > 66 yr > 30 yr. Rh/Rs ranged from 61.79%-75.26%, and Ra/Rs ranged from 24.74%-38.21%. Soil temperature (Ts) and soil dissolved organic carbon (DOC) significantly affected both Rs and Rh, while soil volumetric water content (VWC) only significantly influenced Rs.

Conclusions

Our study reveals the patterns of changes in soil respiration over stand age and its components during the succession of birch forests, providing scientific basis for assessing the carbon dynamics of forest ecosystems at different developmental stages.