Spartina alterniflora invasions seriously threaten the structure and functions of coastal wetlands in China.In this study,the Suaeda salsa community in the Yellow River Estuary wetland was monitored using long-term La...Spartina alterniflora invasions seriously threaten the structure and functions of coastal wetlands in China.In this study,the Suaeda salsa community in the Yellow River Estuary wetland was monitored using long-term Landsat satellite images acquired from 1997 to 2020 to quantify the impact of changes in hydrological connectivity induced by S.alterniflora on neighboring vegetation com-munities.The results showed that S.alterniflora rapidly expanded in the estuary area at a rate of 4.91 km^(2)/yr from 2010 to 2020.At the same time,the hydrological connectivity of the area and the distribution of S.salsa changed significantly.Small tidal creeks dominated the S.alterniflora landscape.The number of tidal creeks increased significantly,but their average length decreased and they tended to develop in a horizontal tree-like pattern.Affected by the changes in hydrological connectivity due to the S.alterniflora invasion,the area of S.salsa decreased by 41.1%,and the degree of landscape fragmentation increased from 1997 to 2020.Variations in the Largest Patch Index(LPI)indicated that the S.alterniflora landscape had become the dominant landscape type in the Yellow River Estuary.The res-ults of standard deviation ellipse(SDE)and Pearson’s correlation analyses indicated that a well-developed hydrological connectivity could promote the maintenance of the S.salsa landscape.The degradation of most S.salsa communities is caused by the influence of S.alterniflora on the morphological characteristics of the hydrological connectivity of tidal creek systems.展开更多
To explore the adaptive strategies of the clonal plant Phragmites australis in heterogeneous salt habitats,we conducted a pot control experiment with severing,salt heterogeneity and competition treatment using dominan...To explore the adaptive strategies of the clonal plant Phragmites australis in heterogeneous salt habitats,we conducted a pot control experiment with severing,salt heterogeneity and competition treatment using dominant plants from the Yellow River Delta,including P australis and Suaeda salsa.This study assessed the effects of salt heterogeneity,clonal integration and interspecific competition on the morphological and physiological traits of p.australis.The results showed that clonal integration significantly promoted root system growth and underground biomass accumulation of P.australis.Competition significantly reduced plant height,tiller number,leaf number,leaf length and internode length,inhibiting above-and underground biomass accumulation.Under the heterogeneous salt treatment,clonal integration significantly promoted only the rhizome biomass of P.australis.The S.salsa competition treatment significantly lowered the chlorophyll contents,net photosynthetic rate,stomatal conductance and transpiration rate of P australis.Nevertheless,leaf length and width were maintained,potentially to minimize photoinhibition.Competition significantly reduced K^(+) contents in P.australis fine roots and rhizomes and Na^(+) contents in fine roots.The Na^(+) content of fine roots was significantly affected by competition,salt heterogeneity,severing treatment and the interaction between competition and severing treatment.In conclusion,competition significantly inhibited the growth,photosynthesis and ion content accumulation of P australis.Meanwhile,clonal integration promoted root growth,especially under heterogeneous salt conditions.Hence,this research provided a significant and deeper understanding of the ecological adaptive responses of clonal plants in coastal heterogeneous habitats.展开更多
The Yellow River Delta(YRD)of China is one of the most active land-sea interaction deltas in the world.However,due to human activities and climate change,it has undergone significant changes,including the degradation ...The Yellow River Delta(YRD)of China is one of the most active land-sea interaction deltas in the world.However,due to human activities and climate change,it has undergone significant changes,including the degradation of natural wetlands and saltwater intrusion.As an integral part of soil microorganisms,fungi play a crucial role in maintaining and stabilizing the function of wetland ecosystems.To better understand the composition and diversity changes of fungal communities along a salinity gradient in the YRD of China and their relationship with environmental factors,fungal diversity,abundance,and composition in the sediments of four typical vegetation communities spanning from the riverbank to the seaside were investigated.The results showed that the electrical conductivity(EC)increased significantly from the riverbank to the coastal area(P<0.05),but the levels of total nitrogen(TN),total carbon(TC),total sulfur(TS),available phosphorous(AP),and ammonium(NH_(4)^(+)-N)increased in Phragmites australis community and then experienced a significant decrease in Tamarix chinensis community and Suaeda salsa community(P<0.05).The alpha diversity(Shannon and Simpson indices)of the soil fungal community exhibited a negative correlation with EC.There was a significant alteration in the structure of the fungal community,primarily influenced by EC and NO_(3)^(-)-N.Ascomycota was found to be the most abundant phylum,and its relative abundance is positively correlated with pH and TS.The relative abundance of Sordariomycetes,the second-largest class of Ascomycota,reached 38.95%.Salinity was identified as the most important factor driving changes in soil fungal community composition.In summary,the fungal community changed significantly along the salinity gradient,and different environmental factors impacted various tiers of fungal populations differently.The findings of this study lay the groundwork for comprehending soil fungal communities and their primary influencing factors in newly formed wetlands.展开更多
基金Under the auspices of Key Program of the National Natural Science Foundation of China(No.U2006215,U1806218)the National Key R&D Program of China(No.2017YFC0505902)。
文摘Spartina alterniflora invasions seriously threaten the structure and functions of coastal wetlands in China.In this study,the Suaeda salsa community in the Yellow River Estuary wetland was monitored using long-term Landsat satellite images acquired from 1997 to 2020 to quantify the impact of changes in hydrological connectivity induced by S.alterniflora on neighboring vegetation com-munities.The results showed that S.alterniflora rapidly expanded in the estuary area at a rate of 4.91 km^(2)/yr from 2010 to 2020.At the same time,the hydrological connectivity of the area and the distribution of S.salsa changed significantly.Small tidal creeks dominated the S.alterniflora landscape.The number of tidal creeks increased significantly,but their average length decreased and they tended to develop in a horizontal tree-like pattern.Affected by the changes in hydrological connectivity due to the S.alterniflora invasion,the area of S.salsa decreased by 41.1%,and the degree of landscape fragmentation increased from 1997 to 2020.Variations in the Largest Patch Index(LPI)indicated that the S.alterniflora landscape had become the dominant landscape type in the Yellow River Estuary.The res-ults of standard deviation ellipse(SDE)and Pearson’s correlation analyses indicated that a well-developed hydrological connectivity could promote the maintenance of the S.salsa landscape.The degradation of most S.salsa communities is caused by the influence of S.alterniflora on the morphological characteristics of the hydrological connectivity of tidal creek systems.
基金supported by the National Natural Science Foundation of China(42471111)the Natural Science Foundation of Shandong Province(ZR2023MD076).
文摘To explore the adaptive strategies of the clonal plant Phragmites australis in heterogeneous salt habitats,we conducted a pot control experiment with severing,salt heterogeneity and competition treatment using dominant plants from the Yellow River Delta,including P australis and Suaeda salsa.This study assessed the effects of salt heterogeneity,clonal integration and interspecific competition on the morphological and physiological traits of p.australis.The results showed that clonal integration significantly promoted root system growth and underground biomass accumulation of P.australis.Competition significantly reduced plant height,tiller number,leaf number,leaf length and internode length,inhibiting above-and underground biomass accumulation.Under the heterogeneous salt treatment,clonal integration significantly promoted only the rhizome biomass of P.australis.The S.salsa competition treatment significantly lowered the chlorophyll contents,net photosynthetic rate,stomatal conductance and transpiration rate of P australis.Nevertheless,leaf length and width were maintained,potentially to minimize photoinhibition.Competition significantly reduced K^(+) contents in P.australis fine roots and rhizomes and Na^(+) contents in fine roots.The Na^(+) content of fine roots was significantly affected by competition,salt heterogeneity,severing treatment and the interaction between competition and severing treatment.In conclusion,competition significantly inhibited the growth,photosynthesis and ion content accumulation of P australis.Meanwhile,clonal integration promoted root growth,especially under heterogeneous salt conditions.Hence,this research provided a significant and deeper understanding of the ecological adaptive responses of clonal plants in coastal heterogeneous habitats.
基金Under the auspices of the National Natural Science Foundation of China(No.42471111,42107419)the Natural Science Foundation of Shandong Province(No.ZR2023MD076)+2 种基金Talent Induction Program for Youth Innovation Teams in Colleges and Universities of Shandong Province(No.2022-2024)Youth Innovation Teams in Colleges and Universities of Shandong Province(No.2022KJ118)Jilin Provincial Department of Science and Technology Project(No.20230203174SF)。
文摘The Yellow River Delta(YRD)of China is one of the most active land-sea interaction deltas in the world.However,due to human activities and climate change,it has undergone significant changes,including the degradation of natural wetlands and saltwater intrusion.As an integral part of soil microorganisms,fungi play a crucial role in maintaining and stabilizing the function of wetland ecosystems.To better understand the composition and diversity changes of fungal communities along a salinity gradient in the YRD of China and their relationship with environmental factors,fungal diversity,abundance,and composition in the sediments of four typical vegetation communities spanning from the riverbank to the seaside were investigated.The results showed that the electrical conductivity(EC)increased significantly from the riverbank to the coastal area(P<0.05),but the levels of total nitrogen(TN),total carbon(TC),total sulfur(TS),available phosphorous(AP),and ammonium(NH_(4)^(+)-N)increased in Phragmites australis community and then experienced a significant decrease in Tamarix chinensis community and Suaeda salsa community(P<0.05).The alpha diversity(Shannon and Simpson indices)of the soil fungal community exhibited a negative correlation with EC.There was a significant alteration in the structure of the fungal community,primarily influenced by EC and NO_(3)^(-)-N.Ascomycota was found to be the most abundant phylum,and its relative abundance is positively correlated with pH and TS.The relative abundance of Sordariomycetes,the second-largest class of Ascomycota,reached 38.95%.Salinity was identified as the most important factor driving changes in soil fungal community composition.In summary,the fungal community changed significantly along the salinity gradient,and different environmental factors impacted various tiers of fungal populations differently.The findings of this study lay the groundwork for comprehending soil fungal communities and their primary influencing factors in newly formed wetlands.
