Differences in the regulation of soil carbon pool quality and stability by leaf-litter and root-litter decomposition.

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Research Pub Date : 2024-11-02 DOI:10.1016/j.envres.2024.120285
Jia Zeng, Xiangyang Li, Junnan Jian, Liheng Xing, Yu Li, Xing Wang, Qi Zhang, Chengjie Ren, Gaihe Yang, Xinhui Han
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Abstract

Litter plays a crucial role in soil ecosystems. However, the differences in decomposition between leaf-litter and root-litter and their relative contributions to soil carbon pools and stability are not yet clear. Therefore, we conducted a 450-day in situ decomposition experiment in a semi-arid grassland to investigate the effects of soil biophysical and chemical properties on litter decomposition and to elucidate the dynamics of soil carbon pools during the decomposition process. The results showed that the decomposition rate (K) of leaf-litter was significantly higher than that of root-litter, and litter quality was the most important factor affecting the K of leaf-litter (58%) and root-litter (63%). Leaf-litter decomposition was more effective in promoting the increase in soil leucine aminopeptidase and β-1,4-glucosidase activities, as well as the accumulation of microbial biomass carbon (MBC), particulate organic carbon (POC), and dissolved organic carbon (DOC), compared to root-litter. However, the difference in the impact of leaf-litter and root-litter on soil organic carbon (SOC) was not significant. The decomposition of leaf-litter contributed more significantly to enhancing the soil carbon pool management index (CPMI) compared to root-litter, with increases of 39% and 25%, respectively. In contrast, leaf-litter decomposition significantly reduced the mineral-associated organic carbon (MAOC) and the MAOC/POC ratio, while root-litter decomposition significantly increased the MAOC and MAOC/POC. Random forest, partial correlation, and path analysis indicated that the effects of leaf-litter and root-litter decomposition on CPMI were mainly regulated by decomposition time and soil carbon components, while the effects on MAOC/POC were mainly controlled by litter quality. The results demonstrate that both leaf-litter and root-litter can enhance soil carbon storage and CPMI, but root-litter may be more beneficial for soil carbon pool stability. These results further contribute to the understanding of the continuous system of litter-soil carbon pools.

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叶屑和根屑分解对土壤碳库质量和稳定性的调节差异。
腐殖质在土壤生态系统中起着至关重要的作用。然而,叶状废弃物和根状废弃物的分解差异及其对土壤碳库和稳定性的相对贡献尚不清楚。因此,我们在半干旱草地上进行了为期 450 天的原位分解实验,以研究土壤生物物理和化学特性对枯落物分解的影响,并阐明分解过程中土壤碳库的动态变化。结果表明,叶状废弃物的分解率(K)明显高于根状废弃物,废弃物质量是影响叶状废弃物分解率(58%)和根状废弃物分解率(63%)的最重要因素。与根状废弃物相比,叶状废弃物的分解更能促进土壤亮氨酸氨肽酶和β-1,4-葡萄糖苷酶活性的提高,以及微生物生物量碳(MBC)、颗粒有机碳(POC)和溶解有机碳(DOC)的积累。然而,叶屑和根屑对土壤有机碳(SOC)的影响差异并不显著。与根部残留物相比,叶片残留物的分解对提高土壤碳库管理指数(CPMI)的贡献更大,分别提高了 39% 和 25%。相比之下,叶片分解显著降低了矿质相关有机碳(MAOC)和MAOC/POC比率,而根叶分解则显著提高了MAOC和MAOC/POC。随机森林分析、偏相关分析和路径分析表明,叶屑和根屑分解对 CPMI 的影响主要受分解时间和土壤碳组分的调控,而对 MAOC/POC 的影响主要受枯落物质量的控制。研究结果表明,叶屑和根屑都能提高土壤碳储量和CPMI,但根屑可能更有利于土壤碳库的稳定。这些结果进一步加深了人们对废弃物-土壤碳库连续系统的理解。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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