2026-03-09 中国科学院（CAS）
中国科学院華南植物園の研究チームは、菌根菌が分泌するグロマリン関連土壌タンパク質（GRSP）が環境変化にどう応答するかを、世界の陸上生態系に関する529研究のメタ解析で評価した。GRSPは土壌有機炭素を安定化する「接着剤」として重要である。結果として、温暖化・CO₂増加・干ばつなどの気候要因よりも、森林再生や窒素・リン供給といった生物・栄養要因の影響が大きいことが判明した。特に森林再生はEE-GRSPを49％、総GRSPを65％増加させた。機械学習と構造方程式モデルにより、植物由来炭素投入量と菌根菌活性がGRSP動態の主要因と確認された。GRSPは土壌団粒構造を強化し、炭素固定を促進するため、森林再生と適切な養分管理が炭素隔離強化に有効と示された。
＜関連情報＞
- https://english.cas.cn/newsroom/research-news/202603/t20260310_1152264.shtml
- https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2435.70256
地球規模の変化は、植物の投入量に影響を与えることで、グロマリンを介した土壌炭素隔離を変化させます Global change reshapes glomalin-mediated soil carbon sequestration by influencing plant inputs
Xianzhen Luo, Lingling Zhang, Hans Lambers, Md. Akhter Hossain, Shutong Liu, Hanxia Yu, Yuanwen Kuang, Dazhi Wen, Enqing Hou
Functional Ecology Published: 21 January 2026
DOI:https://doi.org/10.1111/1365-2435.70256
Abstract
- Glomalin-related soil protein (GRSP), a by-product of arbuscular mycorrhizal fungi (AMF), plays a crucial role in stabilizing soil organic carbon (SOC). Global change factors (GCFs) such as elevated atmospheric carbon dioxide (CO2), climate warming and anthropogenic nitrogen (N) input strongly affect soil AMF activity, consequently influencing GRSP formation. However, the impacts of these GCFs on GRSP dynamics remain poorly understood despite their critical role in SOC accumulation and stability.
- Through a systematic search of publications, we synthesized 529 observations from 122 primary studies worldwide. We conducted a meta-analysis to reveal general patterns and drivers of the effects of N, phosphorus (P), their co-addition, warming, elevated [CO2], drought and forest restoration on easily extractable (EE-GRSP) and total GRSP (T-GRSP), and quantitatively assessed the role of GRSP in SOC sequestration.
- Results showed that N, P, their co-addition and forest restoration increased EE-GRSP by 12%, 3.1%, 13.4% and 49%, and T-GRSP by 13%, 10%, 11% and 65%, respectively, because reduced nutrient limitation stimulated plant inputs and AMF growth, promoting the formation of GRSP. In contrast, elevated [CO2], warming, and drought had negligible effects on GRSP. Machine learning identified plant inputs (partly proxied by plant biomass) as the primary mediator of GRSP changes along with AMF activity. The increases in GRSP were positively correlated with the soil aggregate stability (e.g. mean weight diameter [MWD] of soil aggregates) and SOC, which itself was positively related to the MWD of soil aggregates. Structural equation modelling further validated that GRSP changes, mainly influenced by altered plant inputs and AMF activity, directly enhance SOC accumulation and indirectly contribute to soil aggregate formation and SOC stability.
- These findings provide insights into the positive role of mycorrhizal fungal metabolites in SOC sequestration and highlight the potential to improve GRSP production to promote carbon sequestration under global environmental change.
