长期高降水会导致草原土壤通过微生物-植物-土壤相互作用而失去碳
Mengmeng Wang1,2, Xin Sun2,3,4,5, Baichuan Cao1
1Institute of Ecological Science and Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University, Guangzhou, China.
Global change biology
|June 15, 2023
概括
降水量增加 (eP) 可以通过改变微生物群落和植物根产量导致土壤碳损失. 这项研究揭示了水有限的生态系统中重要的生物圈气候反.
科学领域:
- 生态生态学 生态生态学
- 气候变化生物学 气候变化生物学
- 土壤科学 土壤科学
背景情况:
- 全球气候模型预测降雨频率和强度增加.
- 高降水 (eP) 对生态系统的生物圈-气候反尚未得到充分理解.
- 长期实地实验对于评估气候变化影响至关重要.
研究的目的:
- 研究高降水 (eP) 对土壤碳动态和微生物群落的长期影响.
- 探索eP与其他气候变化驱动因素 (如二氧化碳 (eCO2) 增加,变暖和沉积) 的交互效应.
- 为了阐明生物圈气候反背后的机制,在水有限的生态系统.
主要方法:
- 利用了关于高降水率 (eP) 的最长时间的实地实验之一.
- 分析了土壤总碳 (C),植物根产量和微生物社区组成 (真菌和细菌基因).
- 评估了单独和与eCO2,变暖和沉积相结合的EP的影响.
主要成果:
- 十年的Ep处理导致了土壤总碳 (C) 的减少.
- 两年后,植物根产量下降了.
- eP改变了微生物社区结构,增加了基因/蛋白质降解和病毒突变的基因,以及微生物应激耐受性基因.
- eCO2交互影响了土壤C,根产量和微生物对eP的反应.
结论:
- 长期的高降水 (eP) 会导致地中海型生态系统的土壤碳损失.
- 这种碳损失是由微生物群落组成,功能特征,根产量和土壤水分的变化所驱动的.
- 确定了一种以前未知的生物圈-气候反机制,涉及微生物-植物-土壤相互作用和EP下的土壤C损失.
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