数字农科院2.0

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

文献类型： 外文期刊

作者： Jian Song;Shiqiang Wana;Kesheng Zhang;Songbai Hong;Jianyang Xia;Shilong Piao;Ying Ping Wang;Jiquan Chen;Dafeng Hui;Yiqi Luo;Shuli Niu;Jingyi Ru;Hao Xu;Mengmei Zheng;Weixing Liu;Haidao Wang;Menghao Tan;Zhenxing Zhou;Jiayin Feng;Xueli Qiu

作者机构：

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

ISSN： 0027-8424

年卷期： 2024 年 121 卷 46 期

页码：

收录情况： SCIE（2024版）

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 × 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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