Mei He, Kai Fang, Leiyi Chen, Xuehui Feng, Shuqi Qin, Dan Kou, Hongbo He, Chao Liang, Yuanhe Yang
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引用次数: 37
摘要
微生物坏死体碳(C)被认为是土壤碳库的重要贡献者。然而,目前还缺乏对不同土层,特别是高寒生态系统微生物坏死体C的大规模系统观测。此外,目前尚不清楚生物和非生物变量(如植物C输入和矿物性质)在调节微生物坏死团C中的相对重要性是否会随着土壤深度而变化。基于青藏高原高寒草原2200 km样带的大尺度采样和生物标志物分析,结合全球草地生态系统数据综合,我们发现青藏高原高寒草原中微生物源C的比例相对较低(表层土壤:45.4% vs. 58.1%;底土:41.7% vs. 53.7%)。我们还发现微生物坏死块C的主要决定因素取决于土壤深度。在表层土壤中,植物C输入和矿物保护对微生物坏死体C起主导作用,而在底土中,土壤粘土颗粒、铁铝氧化物、为了准确预测土壤C的动态及其对全球变暖的潜在反馈,在地球系统模型中应考虑土壤深度对微生物坏死体C的差异驱动因素。
Depth-dependent drivers of soil microbial necromass carbon across Tibetan alpine grasslands
Microbial necromass carbon (C) has been considered an important contributor to persistent soil C pool. However, there still lacks large-scale systematic observations on microbial necromass C in different soil layers, particularly for alpine ecosystems. Besides, it is still unclear whether the relative importance of biotic and abiotic variables such as plant C input and mineral properties in regulating microbial necromass C would change with soil depth. Based on the combination of large-scale sampling along a ~2200 km transect across Tibetan alpine grasslands and biomarker analysis, together with a global data synthesis across grassland ecosystems, we observed a relatively low proportion of microbial-derived C in Tibetan alpine grasslands compared to global grasslands (topsoil: 45.4% vs. 58.1%; subsoil: 41.7% vs. 53.7%). We also found that major determinants of microbial necromass C depended on soil depth. In topsoil, both plant C input and mineral protection exerted dominant effects on microbial necromass C. However, in subsoil, the physico-chemical protection provided by soil clay particles, iron-aluminum oxides, and exchangeable calcium dominantly facilitated the preservation of microbial necromass C. The differential drivers over microbial necromass C between soil depths should be considered in Earth system models for accurately forecasting soil C dynamics and its potential feedback to global warming.
期刊介绍:
Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health.
Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.