Water scarcity frequently contributes to wetland degradation or functional loss.Although agricultural drainage can alleviate water deficits,this often comes at the cost of disrupting native vegetation succession and a...Water scarcity frequently contributes to wetland degradation or functional loss.Although agricultural drainage can alleviate water deficits,this often comes at the cost of disrupting native vegetation succession and altering community structures.In the Songnen Plain of Northeast China,Bolboschoenus planiculmis,a dominant species in saline-alkaline wetlands,provides crucial food for the endangered Siberian crane(Grus leucogeranus).These wetlands,currently threatened by drought,increasingly rely on agricultural drainage for restoration.Previous research has focused on water table change and soil salinization effects,often overlooking the impacts of agricultural drainage-induced water environment changes.A two-year field study was conducted in the Momoge National Natural Reserve on the Songnen Plain,Northeast China from May to August in 2019 and 2020 to examine water environment parameters,vegetation growth,and reproduction characteristics,aiming to identify key factors influencing the plant community.Results reveal spatial heterogeneity in the plant community,with significant correlation between biomass,species diversity,tuber characteristics,and water parameters(P<0.05),albeit with some annual variations.Redundancy analysis identifies water depth,nitrate nitrogen,dissolved oxygen,total dissolved solids,and total phosphorus as primary determinants of community changes(P<0.05).Structural equation modelling demonstrates that water depth directly negatively affects species diversity and reproduction,while indirectly influencing productivity through its direct influence on water salinization.Phosphorus and nitrogen contents positively affect diversity and reproduction,exhibiting a trade-off relationship.These findings highlight the significant impact of agricultural drainage-induced water environment changes on community dynamics,with water parameters collectively influencing species diversity and reproduction through their synergistic and trade-off effects.This study provides valuable scientific insights for optimizing agricultural drainage management and facilitating ecological function restoration amidst ongoing global environmental changes.展开更多
An algal astaxanthin feeding trial was carried out to investigate the ef fects of natural astaxanthin from Haematococcus pluvialis as feed additives on growth, pigmenting efficacy and antioxidant capacity in blood par...An algal astaxanthin feeding trial was carried out to investigate the ef fects of natural astaxanthin from Haematococcus pluvialis as feed additives on growth, pigmenting efficacy and antioxidant capacity in blood parrot(C ichlasoma citrinellum × C ichlasoma. synspilum). Tissue total antioxidant capacity(TAC), superoxide dismutase(SOD), catalase(CAT) and maleic dialdehyde(MDA) were chosen as measures of its antioxidant capacity. All fish which received an astaxanthin(from micro-algal H. pluvialis) supplemented diet with 400 mg/kg of astaxanthin, after 50 days of feeding, the astaxanthin-fed fish displayed a pinkcolored skin and the control-fed fish displayed a grayish skin. For the growth, the weight gains of controlfed fish and astaxanthin-fed fish were 200% and 300%, respectively. Samples of skin and scales were used for analysis of total carotenoids and astaxanthin content, and fish feeding astaxanthin showed significantly( P <0.05) higher concentrations than the control group, indicating that the pigmentation of this fish had been significantly improved by dietary astaxanthin. Compared with the control fish, pigmented fish had lower SOD, CAT and MDA and higher TAC. It can be concluded that supplementation with dietary astaxanthin could eff ectively enhance growth, skin coloration and the antioxidant capacity of this fish. This study will provide a reference for application of natural astaxanthin from H. pluvialis as feed additives in blood parrot artificial breeding. Our data is also useful in ornamental fish farming, especially when the retentivity of astaxanthin in the skin and scales are involved. It is leading to the possibility of increasing the pigmentation of farmed-fish by adding the powdered form of H. pluvialis to the diet as an ef fective pigment.展开更多
The changes of hydrogen peroxide(H2O2)metabolism and antioxidant enzyme activities in a hybrid poplar(Populus simonii×P.pyramidalis‘Opera 8277')in response to mechanical damage(MD)and herbivore wounding(HW)w...The changes of hydrogen peroxide(H2O2)metabolism and antioxidant enzyme activities in a hybrid poplar(Populus simonii×P.pyramidalis‘Opera 8277')in response to mechanical damage(MD)and herbivore wounding(HW)were investigated to determine whether H2O2 could function as the secondary messenger in the signaling of systemic resistance.Results show that H2O2 was generated in wounded leaves through MD and HW treatments and systemically in unwounded leaves around the wounded leaves.The activities of antioxidant enzymes such as superoxide dismutase(SOD),catalase(CAT)and ascorbate peroxidase(APX)were also enhanced.However,the H2O2 accumulation and antioxidant enzyme activities were inhibited in MD leaves through the pretreatment with DPI(which is a specific inhibitor of NADPH oxidase).The results of this study suggest that H2O2 could be systemically induced by MD and HW treatments,and H2O2 metabolism was closely related to the change in SOD,APX and CAT activities.A high level of antioxidant enzymes could decrease membrane lipid peroxidation levels and effectively induce plant defense responses.展开更多
We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phas...We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phase diagrams. We map the phase diagrams when the frequency of the driving pressure f is 26.5 kHz at the ambient pressure Po of 2 and 0.5atm, and for the frequencies 10 and 1 kHz at 1 atm. When the frequency is lowered to 1 kHz, the ambient radius Ro can be as large as 20μm.展开更多
基金Under the auspices of the National Key Research and Development Program of China(No.2022YFF1300900)the National Natural Science Foundation of China(No.41771108,41871102,42471066)+1 种基金the Science and Technology Development Program of Jilin Province of China(No.20230203003SF,20240602026RC)the Major Scientific and Technological Project of Jilin Province of China(No.20230303005SF)。
文摘Water scarcity frequently contributes to wetland degradation or functional loss.Although agricultural drainage can alleviate water deficits,this often comes at the cost of disrupting native vegetation succession and altering community structures.In the Songnen Plain of Northeast China,Bolboschoenus planiculmis,a dominant species in saline-alkaline wetlands,provides crucial food for the endangered Siberian crane(Grus leucogeranus).These wetlands,currently threatened by drought,increasingly rely on agricultural drainage for restoration.Previous research has focused on water table change and soil salinization effects,often overlooking the impacts of agricultural drainage-induced water environment changes.A two-year field study was conducted in the Momoge National Natural Reserve on the Songnen Plain,Northeast China from May to August in 2019 and 2020 to examine water environment parameters,vegetation growth,and reproduction characteristics,aiming to identify key factors influencing the plant community.Results reveal spatial heterogeneity in the plant community,with significant correlation between biomass,species diversity,tuber characteristics,and water parameters(P<0.05),albeit with some annual variations.Redundancy analysis identifies water depth,nitrate nitrogen,dissolved oxygen,total dissolved solids,and total phosphorus as primary determinants of community changes(P<0.05).Structural equation modelling demonstrates that water depth directly negatively affects species diversity and reproduction,while indirectly influencing productivity through its direct influence on water salinization.Phosphorus and nitrogen contents positively affect diversity and reproduction,exhibiting a trade-off relationship.These findings highlight the significant impact of agricultural drainage-induced water environment changes on community dynamics,with water parameters collectively influencing species diversity and reproduction through their synergistic and trade-off effects.This study provides valuable scientific insights for optimizing agricultural drainage management and facilitating ecological function restoration amidst ongoing global environmental changes.
基金Supported by the Xiamen Scientific and Technologic Projects(XSTP)(Nos.3052Z20031086,3052Z20123004)the project of Xiamen Southern Ocean Technology Center of China(No.14CZP035HJ09)+2 种基金partly funded by the Marine Science Base Scientific Research Training and Scientific Research Ability Enhancement Project of Xiamen University(No.J1210050)the National Marine Commonweal Research Program,China(No.201205020-2)the XMU Training Program of Innovation and Enterpreneurship for Undergraduates(No.2016X0619)
文摘An algal astaxanthin feeding trial was carried out to investigate the ef fects of natural astaxanthin from Haematococcus pluvialis as feed additives on growth, pigmenting efficacy and antioxidant capacity in blood parrot(C ichlasoma citrinellum × C ichlasoma. synspilum). Tissue total antioxidant capacity(TAC), superoxide dismutase(SOD), catalase(CAT) and maleic dialdehyde(MDA) were chosen as measures of its antioxidant capacity. All fish which received an astaxanthin(from micro-algal H. pluvialis) supplemented diet with 400 mg/kg of astaxanthin, after 50 days of feeding, the astaxanthin-fed fish displayed a pinkcolored skin and the control-fed fish displayed a grayish skin. For the growth, the weight gains of controlfed fish and astaxanthin-fed fish were 200% and 300%, respectively. Samples of skin and scales were used for analysis of total carotenoids and astaxanthin content, and fish feeding astaxanthin showed significantly( P <0.05) higher concentrations than the control group, indicating that the pigmentation of this fish had been significantly improved by dietary astaxanthin. Compared with the control fish, pigmented fish had lower SOD, CAT and MDA and higher TAC. It can be concluded that supplementation with dietary astaxanthin could eff ectively enhance growth, skin coloration and the antioxidant capacity of this fish. This study will provide a reference for application of natural astaxanthin from H. pluvialis as feed additives in blood parrot artificial breeding. Our data is also useful in ornamental fish farming, especially when the retentivity of astaxanthin in the skin and scales are involved. It is leading to the possibility of increasing the pigmentation of farmed-fish by adding the powdered form of H. pluvialis to the diet as an ef fective pigment.
基金supported by the Key Science Pro-gram of the Sate Forestry Administration of China(2006-59)the National Key Project of Scientific and Technical Supporting Programs Funded by Ministry of Science&Technology of China(2006BAD01A152006BAD24B04).
文摘The changes of hydrogen peroxide(H2O2)metabolism and antioxidant enzyme activities in a hybrid poplar(Populus simonii×P.pyramidalis‘Opera 8277')in response to mechanical damage(MD)and herbivore wounding(HW)were investigated to determine whether H2O2 could function as the secondary messenger in the signaling of systemic resistance.Results show that H2O2 was generated in wounded leaves through MD and HW treatments and systemically in unwounded leaves around the wounded leaves.The activities of antioxidant enzymes such as superoxide dismutase(SOD),catalase(CAT)and ascorbate peroxidase(APX)were also enhanced.However,the H2O2 accumulation and antioxidant enzyme activities were inhibited in MD leaves through the pretreatment with DPI(which is a specific inhibitor of NADPH oxidase).The results of this study suggest that H2O2 could be systemically induced by MD and HW treatments,and H2O2 metabolism was closely related to the change in SOD,APX and CAT activities.A high level of antioxidant enzymes could decrease membrane lipid peroxidation levels and effectively induce plant defense responses.
基金Supported by the National Natural Science Foundation of China under Grant No.19934001。
文摘We have numerically analysed the stability of sonoluminescing bubbles in a relatively wide range of experimental parameters and have determined the stable domains for single-bubble sonoluminescence in the Pa - Ro phase diagrams. We map the phase diagrams when the frequency of the driving pressure f is 26.5 kHz at the ambient pressure Po of 2 and 0.5atm, and for the frequencies 10 and 1 kHz at 1 atm. When the frequency is lowered to 1 kHz, the ambient radius Ro can be as large as 20μm.
