Nitrogen(N)and phosphorus(P)are limited nutrients in terrestrial ecosystems,and their limitation patterns are being changed by the increase in N deposition.However,little information concerns the plant growth and the ...Nitrogen(N)and phosphorus(P)are limited nutrients in terrestrial ecosystems,and their limitation patterns are being changed by the increase in N deposition.However,little information concerns the plant growth and the soil biological responses to N and P additions among different soils simultaneously,and these responses may contribute to understand plant-soil interaction and predict plant performance under global change.Thus,this study aimed to explore how N and P limitation changes in different soil types,and reveal the relationship between plant and soil biological responses to nutrient additions.We planted Dodonaea viscosa,a globally distributed species in three soil types(Lixisols,Regosols and Luvisols)in Yuanmou dry-hot valley in Southwest China and fertilized them factorially with N and P.The growth and biomass characters of D.viscosa,soil organic matter,available N,P contents and soil carbon(C),N,P-related enzyme activities were quantified.N addition promoted the growth and leaf N concentration of D.viscosa in Lixisols;N limitation in Lixisols was demonstrated by lower soil available N with higher urease activity.P addition promoted the growth and leaf P concentration of D.viscosa in Luvisols;severe P limitation in Luvisols was demonstrated by a higher soil available N:P ratio with higher phosphatase activity.Urease activity was negatively correlated with soil available N in Nlimited Lixisols,and phosphatase activity was negatively correlated with soil available P in P-limited Luvisols.Besides,the aboveground biomass and leaf N concentration of D.viscosa were positively correlated with soil available N in Lixisols,but the aboveground biomass was negatively correlated with soil available P.Our results show similar nutrient limitation patterns between plant and soil microorganism in the condition of enough C,and the nutrient limitations differ across soil types.With the continued N deposition,N limitation of the Lixisols in dry hot valleys is expected to be alleviated,while P limitation of the Luvisols in the mountaintop may be worse in the future,which should be considered when restoring vegetation.展开更多
Phytochemical investigation of the aerial parts of Dodonaea viscosa led to the isolation of six new compounds including four isoprenylated flavonoids,dodovisones A-D(1-4),and two clerodane diterpenoids,dodovislactones...Phytochemical investigation of the aerial parts of Dodonaea viscosa led to the isolation of six new compounds including four isoprenylated flavonoids,dodovisones A-D(1-4),and two clerodane diterpenoids,dodovislactones A and B(5 and 6).Their structures were established by extensive spectroscopic analysis.展开更多
Seeds of Dodonaea viscosa （L.） Jacq, a representative species in dry and hot valleys in Southwest China, were chosen as experimental materials. In this experiment, the D. viscosa seeds were treated at 40, 60, 80 and...Seeds of Dodonaea viscosa （L.） Jacq, a representative species in dry and hot valleys in Southwest China, were chosen as experimental materials. In this experiment, the D. viscosa seeds were treated at 40, 60, 80 and 100℃ respectively before germination to study impacts of high temperature treatment on their generation rate and to further discuss the roles of fire during the process of vegetation formation in dry and hot valley areas of China. The results show that when the temperature was higher than 40 ℃, the germination rate of D. viscosa seeds was significantly higher than that of the control group, and the heat shock effect was apparent. The germination rate was the highest when the seeds were treated at 80 ℃ for 10 min, reaching 63.00%±2.55%. There was still a significant heat shock effect on the D. viscosa seeds which were stored for one year. In comparison with the conventional method of soaking seeds in hot water, the germination rate of D. viscose seeds which were treated at high temperature before germination increased significantly.展开更多
The main aim of this research work was to isolate and characterize the antimicrobial compounds that can be extracted from the leaves of Dodonaea viscosa(D.viscosa)and to assess their antimicrobial potency by establish...The main aim of this research work was to isolate and characterize the antimicrobial compounds that can be extracted from the leaves of Dodonaea viscosa(D.viscosa)and to assess their antimicrobial potency by established in-vitro agar diffusion method.The methanol extract was liquefied and fractioned by using a separatory funnel and organic solvents having different polarities.The agar diffusion technique was used to assess the antimicrobial potency of extracts and pure compounds against 5 g(+and-)microbial strains.Antimicrobial potency results showed that all extracts and isolated pure compounds provided significant antimicrobial potency against the applied microbial strains.The highest activity chloroform extract was analysed by column chromatography(CC)for the isolation of antimicrobial compounds.The structure of the isolated compounds was characterized based on 1D,2D NMR and MS spectra.In conclusion,purest compounds might be useful as a remedy for infectious diseases.展开更多
基金supported financially by the National Natural Science Foundation of China(Grant Nos.41471232,31460127)
文摘Nitrogen(N)and phosphorus(P)are limited nutrients in terrestrial ecosystems,and their limitation patterns are being changed by the increase in N deposition.However,little information concerns the plant growth and the soil biological responses to N and P additions among different soils simultaneously,and these responses may contribute to understand plant-soil interaction and predict plant performance under global change.Thus,this study aimed to explore how N and P limitation changes in different soil types,and reveal the relationship between plant and soil biological responses to nutrient additions.We planted Dodonaea viscosa,a globally distributed species in three soil types(Lixisols,Regosols and Luvisols)in Yuanmou dry-hot valley in Southwest China and fertilized them factorially with N and P.The growth and biomass characters of D.viscosa,soil organic matter,available N,P contents and soil carbon(C),N,P-related enzyme activities were quantified.N addition promoted the growth and leaf N concentration of D.viscosa in Lixisols;N limitation in Lixisols was demonstrated by lower soil available N with higher urease activity.P addition promoted the growth and leaf P concentration of D.viscosa in Luvisols;severe P limitation in Luvisols was demonstrated by a higher soil available N:P ratio with higher phosphatase activity.Urease activity was negatively correlated with soil available N in Nlimited Lixisols,and phosphatase activity was negatively correlated with soil available P in P-limited Luvisols.Besides,the aboveground biomass and leaf N concentration of D.viscosa were positively correlated with soil available N in Lixisols,but the aboveground biomass was negatively correlated with soil available P.Our results show similar nutrient limitation patterns between plant and soil microorganism in the condition of enough C,and the nutrient limitations differ across soil types.With the continued N deposition,N limitation of the Lixisols in dry hot valleys is expected to be alleviated,while P limitation of the Luvisols in the mountaintop may be worse in the future,which should be considered when restoring vegetation.
基金This work was financially supported by National Basic Research Program of China(973 Program,2009CB522300)the“West Light”program of Chinese Academy of Sciencesthe“Large-scale Compound Library”project of National Development Reform Commission.
文摘Phytochemical investigation of the aerial parts of Dodonaea viscosa led to the isolation of six new compounds including four isoprenylated flavonoids,dodovisones A-D(1-4),and two clerodane diterpenoids,dodovislactones A and B(5 and 6).Their structures were established by extensive spectroscopic analysis.
基金Supported by the National Water Pollution Control and Treatment Science and Technology Major Project(2012ZX07101-003-04-04)~~
文摘Seeds of Dodonaea viscosa （L.） Jacq, a representative species in dry and hot valleys in Southwest China, were chosen as experimental materials. In this experiment, the D. viscosa seeds were treated at 40, 60, 80 and 100℃ respectively before germination to study impacts of high temperature treatment on their generation rate and to further discuss the roles of fire during the process of vegetation formation in dry and hot valley areas of China. The results show that when the temperature was higher than 40 ℃, the germination rate of D. viscosa seeds was significantly higher than that of the control group, and the heat shock effect was apparent. The germination rate was the highest when the seeds were treated at 80 ℃ for 10 min, reaching 63.00%±2.55%. There was still a significant heat shock effect on the D. viscosa seeds which were stored for one year. In comparison with the conventional method of soaking seeds in hot water, the germination rate of D. viscose seeds which were treated at high temperature before germination increased significantly.
文摘The main aim of this research work was to isolate and characterize the antimicrobial compounds that can be extracted from the leaves of Dodonaea viscosa(D.viscosa)and to assess their antimicrobial potency by established in-vitro agar diffusion method.The methanol extract was liquefied and fractioned by using a separatory funnel and organic solvents having different polarities.The agar diffusion technique was used to assess the antimicrobial potency of extracts and pure compounds against 5 g(+and-)microbial strains.Antimicrobial potency results showed that all extracts and isolated pure compounds provided significant antimicrobial potency against the applied microbial strains.The highest activity chloroform extract was analysed by column chromatography(CC)for the isolation of antimicrobial compounds.The structure of the isolated compounds was characterized based on 1D,2D NMR and MS spectra.In conclusion,purest compounds might be useful as a remedy for infectious diseases.
