College of Agronomy/State Key Laboratory of Crop Stress Resistance and High-Efficiency Production, Northwest A&F University, Yangling, Shaanxi, China.
Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada.
Ecol Lett. 2024 Jul;27(7):e14469. doi: 10.1111/ele.14469.
The decline in global plant diversity has raised concerns about its implications for carbon fixation and global greenhouse gas emissions (GGE), including carbon dioxide (CO), nitrous oxide (NO) and methane (CH). Therefore, we conducted a comprehensive meta-analysis of 2103 paired observations, examining GGE, soil organic carbon (SOC) and plant carbon in plant mixtures and monocultures. Our findings indicate that plant mixtures decrease soil NO emissions by 21.4% compared to monocultures. No significant differences occurred between mixtures and monocultures for soil CO emissions, CH emissions or CH uptake. Plant mixtures exhibit higher SOC and plant carbon storage than monocultures. After 10 years of vegetation development, a 40% reduction in species richness decreases SOC content and plant carbon storage by 12.3% and 58.7% respectively. These findings offer insights into the intricate connections between plant diversity, soil and plant carbon storage and GGE-a critical but previously unexamined aspect of biodiversity-ecosystem functioning.
全球植物多样性的减少引起了人们对其固碳和全球温室气体排放（GGE），包括二氧化碳（CO）、氧化亚氮（NO）和甲烷（CH）的影响的担忧。因此，我们对 2103 对配对观测进行了综合荟萃分析，研究了植物混交和单种栽培中的 GGE、土壤有机碳（SOC）和植物碳。我们的研究结果表明，与单种栽培相比，植物混交减少了土壤中 21.4%的 NO 排放。土壤 CO 排放、CH 排放或 CH 吸收在混交和单种栽培之间没有显著差异。植物混交比单种栽培具有更高的 SOC 和植物碳储量。在植被发育 10 年后，物种丰富度降低 40%，分别导致 SOC 含量和植物碳储量减少 12.3%和 58.7%。这些发现提供了关于植物多样性、土壤和植物碳储存与 GGE 之间复杂联系的深入了解，这是生物多样性-生态系统功能的一个关键但以前未被研究的方面。
