Yang Rui-Zhe, Yang Shi-Long, Weng Xi-Zhe, Xu Ling-Ying, Liu Xue-Jian, Du Yun-Tian, Zhang Xue-Chen, Zheng Wei, Zhai Bing-Nian, Wang Zhao-Hui, Li Zi-Yan
Key Laboratory of Plant Nutrition and Agri-environment of Northwest, Ministry of Agriculture and Rural Affairs, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
State Key Laboratory of Soil and Sustainable Agriculture, Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2023 Mar 8;44(3):1542-1552. doi: 10.13227/j.hjkx.202205287.
In order to clarify the differences in the effects of vegetation restoration strategies on soil carbon sequestration and aggregate stability under different water-eroded environments, we collected experimental data from 91 papers and evaluated the response of soil organic carbon (SOC) stock and aggregate stability to vegetation restoration based on Meta-analysis. The results showed the following:① compared with cropland or bare land, forestland/grassland restoration was beneficial to increase SOC stock and improve aggregate stability, but the dominant functions of the two were different. The effect of forestland restoration on carbon sequestration was stronger than that of grassland reforestation, and the effect of grassland restoration on aggregate stability was stronger than that of forestland restoration. ② Multi-factor Meta-analysis showed that the factors that significantly affected SOC were restoration year, soil clay content, vegetation coverage, mean annual precipitation (MAP), mean annual temperature (MAT), and soil depth. The positive effect of vegetation restoration on SOC stock increased with the increase in vegetation coverage rate. Grassland restoration had a more significant effect on SOC stock when soil clay content was 20%-32%, it was more likely to promote the carbon sequestration effect of grassland when MAP>800 mm or MAT<15℃, and there was no significant change in SOC stock under different restoration years. However, the effect of forestland restoration on SOC stock was more significant when soil clay content was>32%. Climate conditions had no limited effect on SOC stock in forestland, and there was a positive effect between SOC stock under forestland restoration and restoration years. ③ Vegetation restoration had stronger significant positive effects on mean weight diameter (MWD) and mean geometric diameter (GMD) when the clay content was 20%-32%, and MWD and GMD increased with the increase in vegetation coverage. ④SOC stock growth could explain 25% and 24% of the variation in the effect value of MWD and GMD, respectively. These results indicated that the formation of SOC was the result of multiple factors, and soil aggregate stability was limited only by vegetation coverage and soil clay content. The increase in SOC stock could promote the improvement of water stability MWD and GMD. These results can clarify the carbon sequestration effect of different vegetation restoration measures in water-eroded environments and provide theoretical reference for the restoration and reconstruction of degraded ecosystems.
为了阐明不同水蚀环境下植被恢复策略对土壤碳固存和团聚体稳定性影响的差异，我们收集了91篇论文的实验数据，并基于Meta分析评估了土壤有机碳（SOC）储量和团聚体稳定性对植被恢复的响应。结果如下：①与农田或裸地相比，林地/草地恢复有利于增加SOC储量并改善团聚体稳定性，但二者的主导功能不同。林地恢复对碳固存的影响强于草地造林，草地恢复对团聚体稳定性的影响强于林地恢复。②多因素Meta分析表明，显著影响SOC的因素有恢复年限、土壤黏粒含量、植被覆盖度、年均降水量（MAP）、年均温度（MAT）和土壤深度。植被恢复对SOC储量的积极影响随植被覆盖率的增加而增大。当土壤黏粒含量为20%-32%时，草地恢复对SOC储量的影响更显著；当MAP>800 mm或MAT<15℃时，更有利于促进草地的碳固存效应，且不同恢复年限下SOC储量无显著变化。然而，当土壤黏粒含量>32%时，林地恢复对SOC储量的影响更显著。气候条件对林地SOC储量无限制作用，林地恢复下的SOC储量与恢复年限之间存在正效应。③当黏粒含量为20%-32%时，植被恢复对平均重量直径（MWD）和平均几何直径（GMD）有更强的显著正效应，且MWD和GMD随植被覆盖度的增加而增大。④SOC储量增长分别可以解释MWD和GMD效应值变化的25%和24%。这些结果表明，SOC的形成是多种因素作用的结果，土壤团聚体稳定性仅受植被覆盖度和土壤黏粒含量的限制。SOC储量的增加可以促进水稳定性MWD和GMD的提高。这些结果能够阐明不同植被恢复措施在水蚀环境中的碳固存效应，为退化生态系统的恢复与重建提供理论参考。
