Soil Acidification Decouples Microbial Biomass Production From Necromass Accumulation in Apple Orchards via Enhanced Mineral Association
文献类型：期刊论文
| 作者 | Liu, Yue2; Li, Huimin2; Ma, Tian1; Yan, Kun2; Zhou, Shiwei2; Liu, Xiao2 |
| 刊名 | LAND DEGRADATION & DEVELOPMENT
 |
| 出版日期 | 2026-01-27 |
| 页码 | 12 |
| 关键词 | microbial necromass carbon orchard soil soil acidification soil organic carbon soil pH |
| ISSN号 | 1085-3278 |
| DOI | 10.1002/ldr.70467 |
| 通讯作者 | Liu, Xiao(liuxiao19880202@126.com) |
| 英文摘要 | Extensive chemical fertilization has caused severe soil acidification in China, particularly in orchard ecosystems. Microbial necromass carbon (MNC) plays a pivotal role in soil organic carbon (SOC) accumulation, yet how it responds to acidification and contributes to SOC remains poorly understood. Using a space-for-time substitution approach across apple orchards on the Jiaodong Peninsula, we revealed a fundamental decoupling between microbial biomass production and necromass accumulation driven by acidification. Specifically, acidification suppressed microbial biomass but enhanced MNC accumulation, a paradox primarily explained by a shift in carbon stabilization mechanisms: clay-mineral protection became the dominant process, as directly evidenced by a significant increase in mineral-associated organic carbon (MAOC). This decoupling undoubtedly enhanced the necromass accumulation coefficient (NAC), which was driven by microbial adaptations including higher enzyme activities (beta-xylosidase and acid phosphatase) and a community shift toward fungi. However, the increase in stabilized carbon (MAOC and MNC) could not compensate for substantial losses of labile carbon (e.g., particulate organic carbon), leading to an overall decline in SOC. As a result, the contribution of MNC to SOC increased significantly, a process regulated by soil pH both directly and indirectly through properties such as clay content and the C/N ratio. The concomitant decrease in the SOC:clay ratio indicated reduced mineral saturation under acidification, further highlighting the critical role of mineral protection in sequestering microbial-derived carbon. Our findings demonstrate that acidification reconfigures the soil carbon cycle by strengthening mineral-mediated stabilization pathways, thereby enhancing SOC stability despite a net reduction in total carbon stocks. |
| WOS关键词 | ORGANIC-CARBON FRACTIONS ; ACID ; PH ; MICROORGANISMS ; COMMUNITIES ; RATES |
| WOS研究方向 | Environmental Sciences & Ecology ; Agriculture |
| 语种 | 英语 |
| WOS记录号 | WOS:001669987300001 |
| 资助机构 | National Natural Science Foundation of China |
| 源URL | [http://ir.yic.ac.cn/handle/133337/42050]  |
| 专题 | 烟台海岸带研究所_中科院海岸带环境过程与生态修复重点实验室 |
| 通讯作者 | Liu, Xiao |
| 作者单位 | 1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Yantai, Shandong, Peoples R China 2.Ludong Univ, Coll Hort, Yantai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Yue,Li, Huimin,Ma, Tian,et al. Soil Acidification Decouples Microbial Biomass Production From Necromass Accumulation in Apple Orchards via Enhanced Mineral Association[J]. LAND DEGRADATION & DEVELOPMENT,2026:12. |
| APA | Liu, Yue,Li, Huimin,Ma, Tian,Yan, Kun,Zhou, Shiwei,&Liu, Xiao.(2026).Soil Acidification Decouples Microbial Biomass Production From Necromass Accumulation in Apple Orchards via Enhanced Mineral Association.LAND DEGRADATION & DEVELOPMENT,12. |
| MLA | Liu, Yue,et al."Soil Acidification Decouples Microbial Biomass Production From Necromass Accumulation in Apple Orchards via Enhanced Mineral Association".LAND DEGRADATION & DEVELOPMENT (2026):12. |
入库方式： OAI收割
来源：烟台海岸带研究所
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