Wetland reclamation disrupts original biogeomorphic processes,making passive restoration after agricultural abandonment a key near‒natural solution.Soil organic carbon(TSOC),total nitrogen(TSN),and total phosphorus(TS...Wetland reclamation disrupts original biogeomorphic processes,making passive restoration after agricultural abandonment a key near‒natural solution.Soil organic carbon(TSOC),total nitrogen(TSN),and total phosphorus(TSP)storages serve as critical indicators of ecological restoration outcomes,closely linked to plant community succession and functional strategies,however,their drivers and influencing pathways remain unclear.This study examined soil functions(TSOC,TSN,and TSP),plant communities,and functional traits in passively restored freshwater wetlands following agricultural abandonment on China’s Sanjiang Plain.Results revealed that TSOC and TSN peaked at 14‒and 17‒year post‒restoration,respectively,then stabilized,while TSP initially decreased before increasing.With extended restoration duration,plant communities showed increased height,coverage and biomass but decreased density and diversity,while functional traits transitioned from acquisitive to conservative strategies.Variance partitioning analysis revealed that soil function dynamics were primarily governed by plant community and functional trait interactions.Random forest models identified key drivers,while structural equation modeling delineated both direct effects of restoration duration and indirect pathways mediated by plant attributes.Specifically,synergistic declines in specific leaf area(SLA)and plant density enhanced TSOC accumulation.Coordinated reductions in SLA and stem phosphorus content(SPC)increased aboveground biomass(AGB),thereby elevating TSN but depleting TSP.A trade‒off between leaf phosphorus content(LPC)and root‒to‒shoot ratio(RSR)further modulated TSN dynamics.These findings demonstrate that passive wetland restoration facilitates soil function stabilization,with plant functional traits and community characteristics playing synergistic effects.This mechanistic understanding provides a scientific framework for optimizing restoration strategies.展开更多
The rapid advancement of wireless communication and the increasing demand for electromagnetic stealth have intensified the need for high-performance electromagnetic wave absorbing materials.This work introduces an inn...The rapid advancement of wireless communication and the increasing demand for electromagnetic stealth have intensified the need for high-performance electromagnetic wave absorbing materials.This work introduces an innovative bio-inspired strategy for synthesizing silicon carbide nanostructures anchored on biomass-derived carbon from fig skin via a high-temperature vapor–solid deposition method.By precisely modulating the silicon-to-carbon ratio,we developed various silicon carbide morphologies—including spherical,coral-like,and linear architectures—of which the coral-like configuration(silicon-carbide-3(SC-3))exhibited remarkable electromagnetic wave absorption capabilities.Specifically,SC-3 achieved a minimum reflection loss of-51.27 dB at 14.1 GHz and an effective absorption bandwidth of 4.64 GHz.The enhanced absorption is attributed to the synergistic effects of interface polarization,dipole polarization,and multiple internal reflections fostered by the unique porous structure.These findings underscore the versatility of biomass-derived carbon in tailoring advanced nanostructures and pave the way for developing next-generation electromagnetic absorbers with optimized impedance matching and broadband capabilities.展开更多
基金supported by the National Natural Science Foundation of China(41871102,42471066)the Science and Technology Development Program of Jilin Province of China(20230203003SF,20240602026RC)the Major Scientific and Technological Project of Jilin Province of China(20230303005SF)。
文摘Wetland reclamation disrupts original biogeomorphic processes,making passive restoration after agricultural abandonment a key near‒natural solution.Soil organic carbon(TSOC),total nitrogen(TSN),and total phosphorus(TSP)storages serve as critical indicators of ecological restoration outcomes,closely linked to plant community succession and functional strategies,however,their drivers and influencing pathways remain unclear.This study examined soil functions(TSOC,TSN,and TSP),plant communities,and functional traits in passively restored freshwater wetlands following agricultural abandonment on China’s Sanjiang Plain.Results revealed that TSOC and TSN peaked at 14‒and 17‒year post‒restoration,respectively,then stabilized,while TSP initially decreased before increasing.With extended restoration duration,plant communities showed increased height,coverage and biomass but decreased density and diversity,while functional traits transitioned from acquisitive to conservative strategies.Variance partitioning analysis revealed that soil function dynamics were primarily governed by plant community and functional trait interactions.Random forest models identified key drivers,while structural equation modeling delineated both direct effects of restoration duration and indirect pathways mediated by plant attributes.Specifically,synergistic declines in specific leaf area(SLA)and plant density enhanced TSOC accumulation.Coordinated reductions in SLA and stem phosphorus content(SPC)increased aboveground biomass(AGB),thereby elevating TSN but depleting TSP.A trade‒off between leaf phosphorus content(LPC)and root‒to‒shoot ratio(RSR)further modulated TSN dynamics.These findings demonstrate that passive wetland restoration facilitates soil function stabilization,with plant functional traits and community characteristics playing synergistic effects.This mechanistic understanding provides a scientific framework for optimizing restoration strategies.
基金support from the National Natural Science Foundation of China(No.51972078)the Heilongjiang Touyan Team Program,the Fundamental Research Funds for the Centra Universities(No.HIT.OCEF.2021003)the Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology.
文摘The rapid advancement of wireless communication and the increasing demand for electromagnetic stealth have intensified the need for high-performance electromagnetic wave absorbing materials.This work introduces an innovative bio-inspired strategy for synthesizing silicon carbide nanostructures anchored on biomass-derived carbon from fig skin via a high-temperature vapor–solid deposition method.By precisely modulating the silicon-to-carbon ratio,we developed various silicon carbide morphologies—including spherical,coral-like,and linear architectures—of which the coral-like configuration(silicon-carbide-3(SC-3))exhibited remarkable electromagnetic wave absorption capabilities.Specifically,SC-3 achieved a minimum reflection loss of-51.27 dB at 14.1 GHz and an effective absorption bandwidth of 4.64 GHz.The enhanced absorption is attributed to the synergistic effects of interface polarization,dipole polarization,and multiple internal reflections fostered by the unique porous structure.These findings underscore the versatility of biomass-derived carbon in tailoring advanced nanostructures and pave the way for developing next-generation electromagnetic absorbers with optimized impedance matching and broadband capabilities.
