Economic growth and social stability in the late sixteenth century brought unprecedented prosperity to the city of London. As Thomas Platter observed in 1599, most of the inhabitants were employed in commerce, and mer...Economic growth and social stability in the late sixteenth century brought unprecedented prosperity to the city of London. As Thomas Platter observed in 1599, most of the inhabitants were employed in commerce, and merchants accumulated their wealth. After his accession to the throne, King James generously distributed honors to wealthy merchants and others. Titles became a salable commodity. The sale of honors impaired respect for the titles and aroused bitter feelings and contempt for knighthood and baronetage among citizens. Gentlemen and ladies who suddenly rose to dignity tried to act suitably in their new status and dressed themselves up; yet they often became the subject for laughter. These upstarts were represented in contemporary dramas as ridiculous, contemptuous, and ill-mannered. The fancifully-dressed “city clowns” who came into being in the first decades of the seventeenth century, were found not only on stage but also in and outside of theaters.展开更多
The exotic species Spartina alterniflora(S.alterniflora)seriously threatens the stability and functioning of saltmarsh ecosystems in the Yangtze Estuary.Ambitious efforts have been undertaken to control this species,b...The exotic species Spartina alterniflora(S.alterniflora)seriously threatens the stability and functioning of saltmarsh ecosystems in the Yangtze Estuary.Ambitious efforts have been undertaken to control this species,but subsequent re-invasion is frequent,presenting a significant barrier to restoration.The complexity and high cost of integrated physical control programs has necessitated a shift in focus,leading to considerable attention being paid to the potential of herbicides to control S.alterniflora.To find a strategy for emergency control of small and scattered patches of re-invading S.alterniflora,an in situ field experiment using Gallant(Haloxyfop-R-methyl)herbicide was conducted.The growth parameters of plant density and height were used to evaluate the control efficiency of different treatment dosages and times and sediment samples were taken for environmental toxicity analysis.The results show the following:(1)the control efficacy of the maximum proposed application dose(2.70 g/m2)was 92%for continuous swards and 100%for small patches,while those of other dosages(0.45 g/m2,0.90 g/m2,and 1.35 g/m2)were lower than 40%;(2)the appropriate implementation time was July to August with 100%mortality resulting from a single application,while S.alterniflora was shown to be capable of recovering rapidly after treatment in May;and(3)there were no significant differences in the community structure of meiofauna among the herbicide treatments and the control,and no herbicide residues were detected in sediment samples collected from treatment areas.This chemical control method was implemented in the Shanghai Chongming Dongtan National Bird Nature Reserve(CDNR).The results of this study indicate that Gallant is an environmentally friendly herbicide with high efficiency,which can be adopted for emergency control of re-invading S.alterniflora.展开更多
文摘Economic growth and social stability in the late sixteenth century brought unprecedented prosperity to the city of London. As Thomas Platter observed in 1599, most of the inhabitants were employed in commerce, and merchants accumulated their wealth. After his accession to the throne, King James generously distributed honors to wealthy merchants and others. Titles became a salable commodity. The sale of honors impaired respect for the titles and aroused bitter feelings and contempt for knighthood and baronetage among citizens. Gentlemen and ladies who suddenly rose to dignity tried to act suitably in their new status and dressed themselves up; yet they often became the subject for laughter. These upstarts were represented in contemporary dramas as ridiculous, contemptuous, and ill-mannered. The fancifully-dressed “city clowns” who came into being in the first decades of the seventeenth century, were found not only on stage but also in and outside of theaters.
基金supported by the National Key Research and Development Program of China(Grant No.2016YFC1201100)the National Natural Science Foundation of China(Grant No.41876093)the Scientific Research Project of the Shanghai Science and Technology Committee(Grants No.17DZ1201902,18DZ1206506,and 18DZ1204802).
文摘The exotic species Spartina alterniflora(S.alterniflora)seriously threatens the stability and functioning of saltmarsh ecosystems in the Yangtze Estuary.Ambitious efforts have been undertaken to control this species,but subsequent re-invasion is frequent,presenting a significant barrier to restoration.The complexity and high cost of integrated physical control programs has necessitated a shift in focus,leading to considerable attention being paid to the potential of herbicides to control S.alterniflora.To find a strategy for emergency control of small and scattered patches of re-invading S.alterniflora,an in situ field experiment using Gallant(Haloxyfop-R-methyl)herbicide was conducted.The growth parameters of plant density and height were used to evaluate the control efficiency of different treatment dosages and times and sediment samples were taken for environmental toxicity analysis.The results show the following:(1)the control efficacy of the maximum proposed application dose(2.70 g/m2)was 92%for continuous swards and 100%for small patches,while those of other dosages(0.45 g/m2,0.90 g/m2,and 1.35 g/m2)were lower than 40%;(2)the appropriate implementation time was July to August with 100%mortality resulting from a single application,while S.alterniflora was shown to be capable of recovering rapidly after treatment in May;and(3)there were no significant differences in the community structure of meiofauna among the herbicide treatments and the control,and no herbicide residues were detected in sediment samples collected from treatment areas.This chemical control method was implemented in the Shanghai Chongming Dongtan National Bird Nature Reserve(CDNR).The results of this study indicate that Gallant is an environmentally friendly herbicide with high efficiency,which can be adopted for emergency control of re-invading S.alterniflora.
