Landslide hazard mapping is essential for regional landslide hazard management.The main objective of this study is to construct a rainfall-induced landslide hazard map of Luhe County,China based on an automated machin...Landslide hazard mapping is essential for regional landslide hazard management.The main objective of this study is to construct a rainfall-induced landslide hazard map of Luhe County,China based on an automated machine learning framework(AutoGluon).A total of 2241 landslides were identified from satellite images before and after the rainfall event,and 10 impact factors including elevation,slope,aspect,normalized difference vegetation index(NDVI),topographic wetness index(TWI),lithology,land cover,distance to roads,distance to rivers,and rainfall were selected as indicators.The WeightedEnsemble model,which is an ensemble of 13 basic machine learning models weighted together,was used to output the landslide hazard assessment results.The results indicate that landslides mainly occurred in the central part of the study area,especially in Hetian and Shanghu.Totally 102.44 s were spent to train all the models,and the ensemble model WeightedEnsemble has an Area Under the Curve(AUC)value of92.36%in the test set.In addition,14.95%of the study area was determined to be at very high hazard,with a landslide density of 12.02 per square kilometer.This study serves as a significant reference for the prevention and mitigation of geological hazards and land use planning in Luhe County.展开更多
Arbuscular mycorrhizal fungi(AMF)in the soil encompass a diversity of species and play an important role in maintaining ecosystem balance.However,little research has focused on the AMF diversity of Rosa acicularis Lin...Arbuscular mycorrhizal fungi(AMF)in the soil encompass a diversity of species and play an important role in maintaining ecosystem balance.However,little research has focused on the AMF diversity of Rosa acicularis Lindl.’Luhe’,which has been cultivated in northeastern saline areas,because of its strong salt tolerance and cold resistance.In the present study the AMF in the rhizosphere of R.acicularis Luhe were identified and AMF diversity and community composition were assessed using morphological and molecular techniques.Vesicles,hyphae,and arbuscular structures were observed in seedlings of different ages.Result shows that AMF established a good symbiotic relationship with R.acicularis Luhe.The colonization rate and spore density tended to increase over time.The AMF diversity in the rhizosphere of R.acicularis Luhe was low and four species of AMF were validated:Rhizophagus irregularis,Glomus aggregatum,Septoglomus furcatum,and Funneliformis mosseae.Of these,R.irregularis and G.aggregatum were dominant and have high salt tolerance.Determining the AMF diversity in the rhizosphere of R.acicularis Luhe will aid in screening AMF species with strong resistance and using mycorrhizas for plant establishment in breeding programs.展开更多
Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took th...Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took the current situation as the guide and improving the tourism function as the carrier,made an innovation of the rural tourism industry system,in order to improve the quality of rural tourism development,and realize the strategic goal of rural revitalization.展开更多
Between 1853 and 1858, the militia and hired braves of Luhe county, Jiangsu, distinguished themselves by successfully defending against Taiping attack when surrounding counties and cities all fell. The historian Xu Zi...Between 1853 and 1858, the militia and hired braves of Luhe county, Jiangsu, distinguished themselves by successfully defending against Taiping attack when surrounding counties and cities all fell. The historian Xu Zi （1810-62） served as a militia leader, commanding a company of troops and working to raise funds to pay for provisions. At the same time, he was writing his history of the Southern Ming Courts： Annals of a Fallen State, With Appended Annotations （Xiaotian jinian fukao）. In his history, Xu Zi included anecdotes of his wartime experiences, writing the Taiping War into the history of the Southern Ming. What does history do？ Xu Zi hoped it could help establish and maintain the coherence of the forces fighting the Taiping. To that end, he presented exemplary figures from the past for people of his own time to emulate, and he narrated those stories to his fellow soldiers. At the same time, his work suggests that the practices of the historian--including investigation of sources, expressions of emotion, and evaluation of policy--could provide avenues for defeating the Taiping. By writing himself into his history of the Southern Ming, he showed how the past could become a tool of war.展开更多
基金supported by the State Administration of Science,Technology and Industry for National Defence,PRC(KJSP2020020303)the National Institute of Natural Hazards,Ministry of Emergency Management of China(ZDJ2021-12)。
文摘Landslide hazard mapping is essential for regional landslide hazard management.The main objective of this study is to construct a rainfall-induced landslide hazard map of Luhe County,China based on an automated machine learning framework(AutoGluon).A total of 2241 landslides were identified from satellite images before and after the rainfall event,and 10 impact factors including elevation,slope,aspect,normalized difference vegetation index(NDVI),topographic wetness index(TWI),lithology,land cover,distance to roads,distance to rivers,and rainfall were selected as indicators.The WeightedEnsemble model,which is an ensemble of 13 basic machine learning models weighted together,was used to output the landslide hazard assessment results.The results indicate that landslides mainly occurred in the central part of the study area,especially in Hetian and Shanghu.Totally 102.44 s were spent to train all the models,and the ensemble model WeightedEnsemble has an Area Under the Curve(AUC)value of92.36%in the test set.In addition,14.95%of the study area was determined to be at very high hazard,with a landslide density of 12.02 per square kilometer.This study serves as a significant reference for the prevention and mitigation of geological hazards and land use planning in Luhe County.
基金supported by Adversities Resistance and Widespread Use of Rosa acicularis ‘Luhe’(2016RAXXJ020) in Heilongjiang Province
文摘Arbuscular mycorrhizal fungi(AMF)in the soil encompass a diversity of species and play an important role in maintaining ecosystem balance.However,little research has focused on the AMF diversity of Rosa acicularis Lindl.’Luhe’,which has been cultivated in northeastern saline areas,because of its strong salt tolerance and cold resistance.In the present study the AMF in the rhizosphere of R.acicularis Luhe were identified and AMF diversity and community composition were assessed using morphological and molecular techniques.Vesicles,hyphae,and arbuscular structures were observed in seedlings of different ages.Result shows that AMF established a good symbiotic relationship with R.acicularis Luhe.The colonization rate and spore density tended to increase over time.The AMF diversity in the rhizosphere of R.acicularis Luhe was low and four species of AMF were validated:Rhizophagus irregularis,Glomus aggregatum,Septoglomus furcatum,and Funneliformis mosseae.Of these,R.irregularis and G.aggregatum were dominant and have high salt tolerance.Determining the AMF diversity in the rhizosphere of R.acicularis Luhe will aid in screening AMF species with strong resistance and using mycorrhizas for plant establishment in breeding programs.
基金Supported by Guangdong Students’Platform for Innovation and Entrepreneurship Training Program"Discussion of the Long-term Mechanism of Industrial Poverty Alleviation from the Perspective of Industrial Value Chain:Taking Green Plum Township of Luhe County as an Example"(S202113714021X)。
文摘Taking green plum Industry in Luhe County of Shanwei City in Guangdong Province as an example,this paper made a precise positioning,based on the characteristics of rural tourism resources in Yongchuan Township,took the current situation as the guide and improving the tourism function as the carrier,made an innovation of the rural tourism industry system,in order to improve the quality of rural tourism development,and realize the strategic goal of rural revitalization.
文摘Between 1853 and 1858, the militia and hired braves of Luhe county, Jiangsu, distinguished themselves by successfully defending against Taiping attack when surrounding counties and cities all fell. The historian Xu Zi （1810-62） served as a militia leader, commanding a company of troops and working to raise funds to pay for provisions. At the same time, he was writing his history of the Southern Ming Courts： Annals of a Fallen State, With Appended Annotations （Xiaotian jinian fukao）. In his history, Xu Zi included anecdotes of his wartime experiences, writing the Taiping War into the history of the Southern Ming. What does history do？ Xu Zi hoped it could help establish and maintain the coherence of the forces fighting the Taiping. To that end, he presented exemplary figures from the past for people of his own time to emulate, and he narrated those stories to his fellow soldiers. At the same time, his work suggests that the practices of the historian--including investigation of sources, expressions of emotion, and evaluation of policy--could provide avenues for defeating the Taiping. By writing himself into his history of the Southern Ming, he showed how the past could become a tool of war.
