Ecological restoration enhances dryland carbon stock by reducing surface soil carbon loss due to wind erosion

文献类型： 外文期刊

第一作者： Song, Jian

作者： Song, Jian;Wan, Shiqiang;Ru, Jingyi;Wang, Haidao;Tan, Menghao;Zhou, Zhenxing;Feng, Jiayin;Qiu, Xueli;Zhang, Kesheng;Hong, Songbai;Xia, Jianyang;Xia, Jianyang;Piao, Shilong;Xu, Hao;Piao, Shilong;Wang, Ying-Ping;Cheni, Jiquan;Hui, Dafeng;Luo, Yiqi;Niul, Shuli;Zheng, Mengmei;Liun, Weixing

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关键词： carbon neutrality; climate solutions; plant productivity; soil carbon; soil erosion

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：9.1； 五年影响因子：10.6 ）

ISSN： 0027-8424

年卷期： 2024 年 121 卷 46 期

页码：

收录情况： SCI

摘要： Enhancing terrestrial carbon (C) stock through ecological restoration, one of the prominent approaches for natural climate solutions, is conventionally considered to be achieved through an ecological pathway, i.e., increased plant C uptake. By conducting a comprehensive regional survey of 4279 1 x 1 m2 plots at 517 sites across China's drylands and a 13- y manipulative experiment in a semiarid grassland within the same region, we show that greater soil and ecosystem C stocks in restored than degraded lands result predominantly from decreased surface soil C loss via suppressed wind erosion. This biophysical pathway is always overlooked in model evaluation of land- based C mitigation strategies. Surprisingly, stimulated plant growth plays a minor role in regulating C stocks under ecological restoration. In addition, the overall enhancement of C stocks in the restored lands increases with both initial degradation intensity and restoration duration. At the national scale, the rate of soil C accumulation (7.87 Tg C y-1) due to reduced wind erosion and surface soil C loss under dryland restoration is equal to 38.8% of afforestation and 56.2% of forest protection in China. Incorporating this unique but largely missed biophysical C- conserving mechanism into land surface models will greatly improve global assessments of the potential of land restoration for mitigating climate change.

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