土壤有机碳随着微生物碳使用效率的下降而增加 在植被恢复期间
Jingwei Shi1,2,3, Lei Deng1,2,3,4, Jianzhao Wu4
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, the Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences and Ministry of Education, Yangling, Shaanxi, China.
Global change biology
|December 10, 2024
概括
在植被恢复过程中,微生物碳利用效率 (CUE) 降低. 土壤pH值,而不是微生物群落的变化,推动了这种变化,影响了成熟森林中的碳捕获.
科学领域:
- 土壤科学 土壤科学
- 微生物学 微生物学
- 生态生态学 生态生态学
背景情况:
- 微生物碳利用效率 (CUE) 是用于微生物生长的有机碳的部分.
- 在全球范围内,CUE通常随着土壤有机碳 (SOC) 含量增加而增加.
- 在自然植被恢复过程中,CUE和SOC之间的关系尚不清楚.
研究的目的:
- 在160年植被恢复时间序列中调查CUE模式.
- 在恢复过程中检查CUE和SOC内容之间的关系.
- 确定陆地生态系统中CUE变化的关键驱动因素.
主要方法:
- 立体测量建模用于估计CUE.
- 在植被恢复时间序列中分析CUE和SOC含量.
- 进行元分析来综合发现.
主要成果:
- 植被恢复导致CUE从0.35下降到0.28.
- 在恢复过程中,随着CUE的减少,SOC含量增加.
- 土壤pH值是CUE的主要预测因素,较低的pH值与CUE下降相关.
- 发现性土壤酸化可以降低CUE.
结论:
- 自然植被的恢复降低了微生物碳使用效率.
- 在成熟森林中,由土壤pH驱动的CUE降低可能会限制预期的碳封存.
- 管理策略应侧重于保持成熟森林中的CUE,以增强碳汇.
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