Scale effects and evaluation models are crucial to the accuracy of landscape ecological risk evaluation.However,most studies conduct these evaluations at a single scale or with a single model,ignoring potential scale ...Scale effects and evaluation models are crucial to the accuracy of landscape ecological risk evaluation.However,most studies conduct these evaluations at a single scale or with a single model,ignoring potential scale effects and changes in landscape patterns.To address this,we took the Leshan City in Sichuan Province of China as a study case.We determined that the optimal spatial granularity for the study area is 150 m by analyzing the sensitivities of eight landscape pattern indices such as landscape fragmentation,landscape spreading,and Shannon's diversity at different spatial granularities,and employing the inflection point identification method.Building on this,we constructed a landscape pattern index model(ERI model)and a landscape pattern index model coupled with the ecological process of soil erosion(SI-ERI model)by incorporating the natural geographic factors of the study area.We used the ERI and SI-ERI models to evaluate the landscape ecological risk of Leshan City across multiple scales,including ecological,administrative,and sample scales.After conducting overlay and spatial autocorrelation analyses of the multi-scale evaluation results,we determined that the administrative scale is optimal for evaluating landscape ecological risk in the study area.At this scale,we verified the accuracy and reliability of the two models'evaluation results against the actual ecological environment in typical areas within the study area.The findings indicated that the SI-ERI model provided more precise and accurate spatial characterization,effectively reflecting the actual landscape ecological risk of Leshan City.According to the SI-ERI model's evaluation results at the administrative scale,Leshan City's overall risk level is relatively low,with good ecological environmental quality.Low-risk areas constitute 56.16%and medium-low-risk areas make up 23.81%,aligning closely with the city's actual situation.This study thus offers a scientific basis and theoretical reference for managing ecological risks and planning urban development in Leshan City.展开更多
The North-South Seismic Belt was analyzed using gravity observation data from 2011 to 2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations ...The North-South Seismic Belt was analyzed using gravity observation data from 2011 to 2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations one month before the Leshan M5.0 earthquake.展开更多
Located at the fringe of the western plain in Sichuan Province and the confluence of the Minjiang, Qingyijiang and Daduhe Rivers, Leshan is an historic city of major importance to tourism. As one of the earliest towns...Located at the fringe of the western plain in Sichuan Province and the confluence of the Minjiang, Qingyijiang and Daduhe Rivers, Leshan is an historic city of major importance to tourism. As one of the earliest towns originally under the jurisdiction of Kai Ming Shi, the king of Shu during the Western Zhou Dynasty (B.C. 1066—展开更多
LESHAN,A small city in eastern Sichuan Province,is famous for its 71-meter-tall statue of the Buddha,which since A.D.713 has stood watch where three rivers,the Minjiang Qingyi-jiang and Daduhe,meet.The site attracts t...LESHAN,A small city in eastern Sichuan Province,is famous for its 71-meter-tall statue of the Buddha,which since A.D.713 has stood watch where three rivers,the Minjiang Qingyi-jiang and Daduhe,meet.The site attracts thousands of tourists every year.展开更多
A system has been set up in China which provides for independent directors of listedcompanies. Whether these independent directors could play an effective role has, however,always been a matter for dispute. The recent...A system has been set up in China which provides for independent directors of listedcompanies. Whether these independent directors could play an effective role has, however,always been a matter for dispute. The recent case of Leshan Power shows that under thelegal framework and share structure which currently exists in China, there is very narrowscope for independent directors to carry out their function. After discussing the main obstaclesto implementation of independent directorship of Chinas listed companies, the authorpoints out several measures that must be taken in order to enhance the effectiveness ofboards of directors. Finally this paper concludes that without the necessary conditions forindependent directors to actually have a functioning role to play, invitation of independentdirectors by listed companies will be a matter of form only.展开更多
基金supported by grants from the Ministry of Science and Technology of the People’s Republic of China(Grant Nos.2019YFC1803500,2019YFC1803504)the Key R&D Projects of Sichuan Provincial Science and Technology Department(Grant Nos.2018SZ0298,2023YFS0390)+1 种基金the Bureau of Science and Technology Aba Qiang Tibetan Autonomous Prefecture(Grant Nos.R22YYJSYJ0004,R23YYJSYJ0010)Southwest University of Science and Technology Doctoral Program(23zx7175)。
文摘Scale effects and evaluation models are crucial to the accuracy of landscape ecological risk evaluation.However,most studies conduct these evaluations at a single scale or with a single model,ignoring potential scale effects and changes in landscape patterns.To address this,we took the Leshan City in Sichuan Province of China as a study case.We determined that the optimal spatial granularity for the study area is 150 m by analyzing the sensitivities of eight landscape pattern indices such as landscape fragmentation,landscape spreading,and Shannon's diversity at different spatial granularities,and employing the inflection point identification method.Building on this,we constructed a landscape pattern index model(ERI model)and a landscape pattern index model coupled with the ecological process of soil erosion(SI-ERI model)by incorporating the natural geographic factors of the study area.We used the ERI and SI-ERI models to evaluate the landscape ecological risk of Leshan City across multiple scales,including ecological,administrative,and sample scales.After conducting overlay and spatial autocorrelation analyses of the multi-scale evaluation results,we determined that the administrative scale is optimal for evaluating landscape ecological risk in the study area.At this scale,we verified the accuracy and reliability of the two models'evaluation results against the actual ecological environment in typical areas within the study area.The findings indicated that the SI-ERI model provided more precise and accurate spatial characterization,effectively reflecting the actual landscape ecological risk of Leshan City.According to the SI-ERI model's evaluation results at the administrative scale,Leshan City's overall risk level is relatively low,with good ecological environmental quality.Low-risk areas constitute 56.16%and medium-low-risk areas make up 23.81%,aligning closely with the city's actual situation.This study thus offers a scientific basis and theoretical reference for managing ecological risks and planning urban development in Leshan City.
基金supported by the Director Foundation of Institute of Seismology,China Earthquake Administration(201326123)the National Natural Science Foundation of China(41204058,41474064)the Ministry of Science and Technology major instrument special sub topic(2012YQ10022506)
文摘The North-South Seismic Belt was analyzed using gravity observation data from 2011 to 2015, and the nontidal analysis results show that there was a nonlinear gravity change at both the Chengdu and Guza seismostations one month before the Leshan M5.0 earthquake.
文摘Located at the fringe of the western plain in Sichuan Province and the confluence of the Minjiang, Qingyijiang and Daduhe Rivers, Leshan is an historic city of major importance to tourism. As one of the earliest towns originally under the jurisdiction of Kai Ming Shi, the king of Shu during the Western Zhou Dynasty (B.C. 1066—
文摘LESHAN,A small city in eastern Sichuan Province,is famous for its 71-meter-tall statue of the Buddha,which since A.D.713 has stood watch where three rivers,the Minjiang Qingyi-jiang and Daduhe,meet.The site attracts thousands of tourists every year.
文摘A system has been set up in China which provides for independent directors of listedcompanies. Whether these independent directors could play an effective role has, however,always been a matter for dispute. The recent case of Leshan Power shows that under thelegal framework and share structure which currently exists in China, there is very narrowscope for independent directors to carry out their function. After discussing the main obstaclesto implementation of independent directorship of Chinas listed companies, the authorpoints out several measures that must be taken in order to enhance the effectiveness ofboards of directors. Finally this paper concludes that without the necessary conditions forindependent directors to actually have a functioning role to play, invitation of independentdirectors by listed companies will be a matter of form only.
