The humification degree of fresh litter directly controls the accumulation of soil humus derived from plant litter,but very little information on this process is available.Planted forests are well known to restrict so...The humification degree of fresh litter directly controls the accumulation of soil humus derived from plant litter,but very little information on this process is available.Planted forests are well known to restrict soil fertility,which is often indicated by the soil humus level.In this study,fresh litter was collected during different plant phenological stages during 2016 and 2017 in a mixed plantation in Southwest China.The values of hue coefficientΔlogK(absorbance ratio of 400 nm and 600 nm on a logarithmic scale),optical density E4/E6(absorbance ratio of 400 nm and 600 nm)and A600/C(absorbance at 600 mm per mg of carbon per ml of extraction)and the concentration of extractable humus carbon(HC)were determined in four litter components(foliar,twigs,reproductive organs and miscellaneous)of the dominant species(Pterocarya stenoptera,Quercus acutissima,Cunninghamia lanceolata and Toxicodendron vernicifluum).All of the litter components exhibited obvious humification characteristics,and showed the highest concentration of extractable HC during the leaf maturation period.The miscellaneous and foliar litters showed greater humification than the other litter types.The components of Pterocarya stenoptera litter exhibited greater degrees of humification than those of the other species,with lowerΔlogK and E4/E6 values and higher A600/C values.The litter from coniferous and evergreen species showed lower humification than that from broad-leaf and deciduous species regardless of the litter component examined.The present results provide new insights into the management of plantations and theoretical data to accurately improve the quality of plantations and maintain soil fertility under a global change.展开更多
Leaf functional traits reflect the ecological strategies of plants and influence their growth and distribution.While variation in leaf traits has been extensively documented across species in terrestrial ecosystems,st...Leaf functional traits reflect the ecological strategies of plants and influence their growth and distribution.While variation in leaf traits has been extensively documented across species in terrestrial ecosystems,studies in wetland ecosystems can enhancethe understanding of leaf trait variation along environmental gradients.Intraspecific studies are particularly valuable for exploring trait variation and its underlying mechanism.Coastal wetlands have become hotspots for studying trait variation,and the invasive Spartina alterniflora,distributed along China's coastline,is an ideal species for investigating leaf traits variation.We examined the geographical variation and abiotic drivers of six leaf functional traits and explored the roles of phenotypic plasticity and genetic differentiation through a two-year common garden experiment.We also analyzed the relationships between leaf traits and growth performance in both field and common garden.All leaf traits exhibited significant geographical variation,which were affected by both climatic and sedimentary variables.Common garden experiment exhibited trait-dependent response,with different leaf traits showing varying degrees of plastic response or genetic differentiation.Variation in leaf size,leaf thickness and specific leaf area was primarily driven by genetic differentiation,while variation in leaf density and leaf dry matter content was largely due to phenotypic plasticity.Leaf size and thickness were positively correlated with growth performance in both field and common garden.This study advances the understanding of leaf trait variation in terrestrial ecosystems and highlights how multiple abiotic variables shape latitudinal patterns in leaf traits.The resource acquisition strategy at high latitudes in the northern hemisphere contributes to the strong growth performance of S.alterniflora,potentially facilitating its northward expansion.In contrast,the resource conservation strategy at low latitudes may hinder its southward expansion.展开更多
The accumulation of soil organic matter and nutrients is an important pathway in effectivelyunderstanding the mechanisms of plant settlement and rock weathering, while the characteristics ofsoil organic carbon (C), ni...The accumulation of soil organic matter and nutrients is an important pathway in effectivelyunderstanding the mechanisms of plant settlement and rock weathering, while the characteristics ofsoil organic carbon (C), nitrogen (N) and phosphorus (P) under different vegetation remain unclear.In this study, the stocks and stoichiometry of soil organic C, N and P were determined in differentpositions and types of vegetation on the surface of the Leshan Giant Buddha. We found that the totalstocks of soil organic C, N and P were 1689.77, 134.6 and 29.48 kg, respectively, for the Buddha.The stocks of soil organic C, N and P under vascular plants were higher than those under othervegetation, with highest values observed under herb. Higher stocks per unit area (m2) of soil organicC, N and P were found on the left and right arms, shoulders, and two platforms. These results providea full primary picture in understanding soil organic C, N and P accumulation and distribution on thesurface of the Buddha, which could supply the fundamental data on weathering management of theBuddha and other similar open-air stone carvings.展开更多
基金This study was supported by the National Natural Science Foundation of China(31470636)Specialized Fund for the Post-Disaster Reconstruction and Heritage Protection in Sichuan Province(No.5132202019000128)the Open Fund for Ecological Restoration and Conservation for Forest and Wetland Key Laboratory of Sichuan Province(No.2020KFKT01).
文摘The humification degree of fresh litter directly controls the accumulation of soil humus derived from plant litter,but very little information on this process is available.Planted forests are well known to restrict soil fertility,which is often indicated by the soil humus level.In this study,fresh litter was collected during different plant phenological stages during 2016 and 2017 in a mixed plantation in Southwest China.The values of hue coefficientΔlogK(absorbance ratio of 400 nm and 600 nm on a logarithmic scale),optical density E4/E6(absorbance ratio of 400 nm and 600 nm)and A600/C(absorbance at 600 mm per mg of carbon per ml of extraction)and the concentration of extractable humus carbon(HC)were determined in four litter components(foliar,twigs,reproductive organs and miscellaneous)of the dominant species(Pterocarya stenoptera,Quercus acutissima,Cunninghamia lanceolata and Toxicodendron vernicifluum).All of the litter components exhibited obvious humification characteristics,and showed the highest concentration of extractable HC during the leaf maturation period.The miscellaneous and foliar litters showed greater humification than the other litter types.The components of Pterocarya stenoptera litter exhibited greater degrees of humification than those of the other species,with lowerΔlogK and E4/E6 values and higher A600/C values.The litter from coniferous and evergreen species showed lower humification than that from broad-leaf and deciduous species regardless of the litter component examined.The present results provide new insights into the management of plantations and theoretical data to accurately improve the quality of plantations and maintain soil fertility under a global change.
基金the National Key R&D Program of China(2022YFC3105401)This research was also supported by the National Science Foundation of China(32025026)China Postdoctoral Science Foundation(2022M722653).
文摘Leaf functional traits reflect the ecological strategies of plants and influence their growth and distribution.While variation in leaf traits has been extensively documented across species in terrestrial ecosystems,studies in wetland ecosystems can enhancethe understanding of leaf trait variation along environmental gradients.Intraspecific studies are particularly valuable for exploring trait variation and its underlying mechanism.Coastal wetlands have become hotspots for studying trait variation,and the invasive Spartina alterniflora,distributed along China's coastline,is an ideal species for investigating leaf traits variation.We examined the geographical variation and abiotic drivers of six leaf functional traits and explored the roles of phenotypic plasticity and genetic differentiation through a two-year common garden experiment.We also analyzed the relationships between leaf traits and growth performance in both field and common garden.All leaf traits exhibited significant geographical variation,which were affected by both climatic and sedimentary variables.Common garden experiment exhibited trait-dependent response,with different leaf traits showing varying degrees of plastic response or genetic differentiation.Variation in leaf size,leaf thickness and specific leaf area was primarily driven by genetic differentiation,while variation in leaf density and leaf dry matter content was largely due to phenotypic plasticity.Leaf size and thickness were positively correlated with growth performance in both field and common garden.This study advances the understanding of leaf trait variation in terrestrial ecosystems and highlights how multiple abiotic variables shape latitudinal patterns in leaf traits.The resource acquisition strategy at high latitudes in the northern hemisphere contributes to the strong growth performance of S.alterniflora,potentially facilitating its northward expansion.In contrast,the resource conservation strategy at low latitudes may hinder its southward expansion.
基金This work was partially supported by the National Natural Science Foundation of China(31470636).
文摘The accumulation of soil organic matter and nutrients is an important pathway in effectivelyunderstanding the mechanisms of plant settlement and rock weathering, while the characteristics ofsoil organic carbon (C), nitrogen (N) and phosphorus (P) under different vegetation remain unclear.In this study, the stocks and stoichiometry of soil organic C, N and P were determined in differentpositions and types of vegetation on the surface of the Leshan Giant Buddha. We found that the totalstocks of soil organic C, N and P were 1689.77, 134.6 and 29.48 kg, respectively, for the Buddha.The stocks of soil organic C, N and P under vascular plants were higher than those under othervegetation, with highest values observed under herb. Higher stocks per unit area (m2) of soil organicC, N and P were found on the left and right arms, shoulders, and two platforms. These results providea full primary picture in understanding soil organic C, N and P accumulation and distribution on thesurface of the Buddha, which could supply the fundamental data on weathering management of theBuddha and other similar open-air stone carvings.
