| 水蚀环境植被恢复对土壤有机碳固存和团聚体稳定的影响:Meta分析 |
| 摘要点击 2965 全文点击 972 投稿时间：2022-05-25 修订日期：2022-06-22 |
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| 中文关键词 水蚀环境 植被恢复 土壤有机碳(SOC) 团聚体 Meta分析 |
| 英文关键词 water-eroded environment vegetation restoration soil organic carbon(SOC) soil aggregates Meta-analysis |
| 作者 | 单位 | E-mail | | 杨睿哲 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | 875654629@qq.com | | 杨世龙 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 翁希哲 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 徐灵颖 | 中国科学院南京土壤研究所江苏常熟农田生态系统国家野外科学观测研究站, 南京 210008 | | | 刘雪健 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 杜运田 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 张雪辰 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 郑伟 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 翟丙年 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 王朝辉 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | | | 李紫燕 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 杨凌 712100 | liziyan0161@126.com |
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| 中文摘要 |
| 为明确水蚀环境不同条件下植被恢复策略对土壤固碳和团聚体稳定性的影响差异，通过搜集91篇论文的实验数据，以农田（或裸地）为对照，基于Meta分析评估土壤有机碳（SOC）储量和团聚体稳定性对水蚀环境退耕还林/还草措施的响应.结果表明：①退耕还林/还草均有利于提高SOC储量，改善土壤团聚体稳定性，但两者的优势功能存在差异，还林的固碳效应强于还草，而还草对增强团聚体稳定性的作用更强.②多因素Meta分析表明显著影响SOC的因素有：恢复年份、土壤黏粒含量、植被覆盖度、年平均降雨（MAP）、年平均气温（MAT）和土壤深度.其中植被恢复对SOC储量的正向效应随着植被覆盖率增加而提高；草地恢复在土壤黏粒含量为20%~32%下对SOC储量的提高效应更显著，在MAP>800 mm或MAT<15℃条件下更易促进草地固碳效应，不同恢复年限下的草地固碳效应无显著变化；而林地恢复在土壤黏粒含量>32%下对SOC储量的提高效应更显著，气候条件对林地SOC储量无限制性影响，林地恢复下的SOC储量与恢复年限间存在正向效应.③植被恢复在黏粒含量为20%~32%时对平均重量直径（MWD）和平均几何直径（GMD）的正向效应更显著，MWD和GMD随植被覆盖率增加而增加.④SOC储量增长能分别解释25%和24%的MWD和GMD的效应值变异.结果表明，SOC的形成是多因素综合作用的结果，而土壤结构稳定性仅受植被覆盖度和土壤黏粒的限制.SOC储量的增加可促进提高MWD和GMD.研究可明确不同植被恢复措施在水蚀环境的固碳效果，为退化生态系统的恢复与重建提供理论参考. |
| 英文摘要 |
| 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. |
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