At present and for a long time in the future, urbanization in China will maintain a rapid development speed. After the rainstorm, the phenomenon of “sea views” is common. The direct reason is that the urban drainage...At present and for a long time in the future, urbanization in China will maintain a rapid development speed. After the rainstorm, the phenomenon of “sea views” is common. The direct reason is that the urban drainage system and the ground drainage system cannot afford the large flow of water in a short period of time, but the most fundamental reason is that the artificial construction environment changes the water storage and drainage function of the ground under the natural state. “Sponge city construction” came into being. This paper mainly analyzes and studies the sponge city construction in Pingxiang City, Jiangxi Province, and uses the method of field investigation and literature data to clarify the ideas of the sponge city construction in Pingxiang City and summarize the successful experience, which can provide a reference for the subsequent “sponge city development” ideas.展开更多
Appearance and exhaustion of the resource city is an inevitable objective phenomenon in the process of industrialization. Transformation of the resource city became the focus of attention with highlighting problems an...Appearance and exhaustion of the resource city is an inevitable objective phenomenon in the process of industrialization. Transformation of the resource city became the focus of attention with highlighting problems and contradictions in the city. The paper places emphasis on path selection and transformation strategies of resource-exhausted city transformation taking the coal city Pingxiang as an example. From the perspective of profi le and effectiveness of transformation in Pingxiang city, the paper analyzes the main problems in the city transformation, points out its main path direction from economic transformation, social transformation and ecological transformation, and fi nally presents transition strategy and policy recommendations to the city.展开更多
So far,14 examples of dominant genic malesterility on 10 crop species have been discov-ered in the world.In crossing sterile plants ofnon-pollen-type Fof cultivar-Wild combina-tlon(Ping＇ai 58/Huaye)as female parent w...So far,14 examples of dominant genic malesterility on 10 crop species have been discov-ered in the world.In crossing sterile plants ofnon-pollen-type Fof cultivar-Wild combina-tlon(Ping＇ai 58/Huaye)as female parent withfertile plants Fof the wild-cultivar combination(Huaye/Ping＇ai 58)as male parent,a typ-ical abortive plant was found in the progeny.By excluding the Probability of balancedlethal,gametophyte sterility,and chromo-some aberration,studies showed that thesterility was controlled by a dominant malesterile gene in the nucleus.The material was展开更多
Distribution of the rare-earth elements (REE) in dacite has been studied so as to get a better understanding of the migration behavior of REE during alteration. Both unaltered and altered samples were collected in an ...Distribution of the rare-earth elements (REE) in dacite has been studied so as to get a better understanding of the migration behavior of REE during alteration. Both unaltered and altered samples were collected in an unpolluted area of Guangxi Zhuang Autonomous Region, southwest China. The REE concentrations were analyzed by ICP-MS. It is concluded that the REE were enriched during dacite alteration in varying degrees. The chondrite-normalized REE patterns of altered samples approximately maintain the characteristics of unaltered samples. However, if we normalize the REE concentrations of altered samples with unaltered dacite, fractionation of REE will appear. The LREE are more enriched than HREE in all altered samples with the LREE possibly precipitated as carbonate minerals. Both positive and negative Eu anomalies exist. Enrichment, immobility and depletion are noticed for the element Lu. Heavy mineral alteration, difference in stability constant between carbonate LREE and HREE complexes, downward migration of weathering fluid and microenvironment change may be responsible for the fractionation of REE in the altered dacite.展开更多
[目的]揭示萍乡碳储量时空分布特征,阐明土地地类变化与碳储量之间的关系,为探明区域生态系统碳储量状况提供数据支撑。[方法]利用FLUS(future land use simulation)模型与InVEST(integrated valuation of ecosystem services and trade...[目的]揭示萍乡碳储量时空分布特征,阐明土地地类变化与碳储量之间的关系,为探明区域生态系统碳储量状况提供数据支撑。[方法]利用FLUS(future land use simulation)模型与InVEST(integrated valuation of ecosystem services and trade-offs)模型,预测了2030年萍乡市3种不同情景下(自然发展、耕地保护和生态优先)碳储量值。[结果](1)2010—2020年萍乡市碳储量整体呈下降趋势,共减少1.47×10^(6)t;(2)耕地、建设用地、草地、水体和建设用地面积增加和林地与灌木面积减少,是导致碳储量变化的主要原因;(3)2030年自然发展、耕地保护和生态优先情景下陆地生态系统碳储量分别约为4.906×10^(7),4.919×10^(7),5.038×10^(7)t,其中生态优先情景下碳储量损失最少。[结论]萍乡生态系统碳储量呈下降趋势,主要受耕地与建设用地增大的影响,未来应加强对安源区与经济开发区重点变化区域的监测研究。展开更多
文摘At present and for a long time in the future, urbanization in China will maintain a rapid development speed. After the rainstorm, the phenomenon of “sea views” is common. The direct reason is that the urban drainage system and the ground drainage system cannot afford the large flow of water in a short period of time, but the most fundamental reason is that the artificial construction environment changes the water storage and drainage function of the ground under the natural state. “Sponge city construction” came into being. This paper mainly analyzes and studies the sponge city construction in Pingxiang City, Jiangxi Province, and uses the method of field investigation and literature data to clarify the ideas of the sponge city construction in Pingxiang City and summarize the successful experience, which can provide a reference for the subsequent “sponge city development” ideas.
基金supported by the Youth Foundation of Human Society Scientific Research of Ministry of Education of China(Grant No.13YJC790208)Jiangxi Province Social Sciences "Twelveth-Five Years" Program(Grant No.11YJ18)+1 种基金Jiangxi Province Soft Science Program(Grant No.20141BBA10024)Jiangxi Province Education Science "Twelveth-Five Years" Program(Grant No.11YB147)
文摘Appearance and exhaustion of the resource city is an inevitable objective phenomenon in the process of industrialization. Transformation of the resource city became the focus of attention with highlighting problems and contradictions in the city. The paper places emphasis on path selection and transformation strategies of resource-exhausted city transformation taking the coal city Pingxiang as an example. From the perspective of profi le and effectiveness of transformation in Pingxiang city, the paper analyzes the main problems in the city transformation, points out its main path direction from economic transformation, social transformation and ecological transformation, and fi nally presents transition strategy and policy recommendations to the city.
文摘So far,14 examples of dominant genic malesterility on 10 crop species have been discov-ered in the world.In crossing sterile plants ofnon-pollen-type Fof cultivar-Wild combina-tlon(Ping＇ai 58/Huaye)as female parent withfertile plants Fof the wild-cultivar combination(Huaye/Ping＇ai 58)as male parent,a typ-ical abortive plant was found in the progeny.By excluding the Probability of balancedlethal,gametophyte sterility,and chromo-some aberration,studies showed that thesterility was controlled by a dominant malesterile gene in the nucleus.The material was
文摘Distribution of the rare-earth elements (REE) in dacite has been studied so as to get a better understanding of the migration behavior of REE during alteration. Both unaltered and altered samples were collected in an unpolluted area of Guangxi Zhuang Autonomous Region, southwest China. The REE concentrations were analyzed by ICP-MS. It is concluded that the REE were enriched during dacite alteration in varying degrees. The chondrite-normalized REE patterns of altered samples approximately maintain the characteristics of unaltered samples. However, if we normalize the REE concentrations of altered samples with unaltered dacite, fractionation of REE will appear. The LREE are more enriched than HREE in all altered samples with the LREE possibly precipitated as carbonate minerals. Both positive and negative Eu anomalies exist. Enrichment, immobility and depletion are noticed for the element Lu. Heavy mineral alteration, difference in stability constant between carbonate LREE and HREE complexes, downward migration of weathering fluid and microenvironment change may be responsible for the fractionation of REE in the altered dacite.
基金Supported by the National Natural Science Foundation of China （41172138） the Special Fund Project of Jiangxi Energy Bureau （20100730） Acknowledgments The authors wish to thank Professor Tang Xiuyi from Anhui University of Science and Technology for his constructive advice. The authors also express their gratitude to the technical personnel from Jiangxi Exploration Institute of Coalfield Geology, Jiangxi Coal Group Corporation, for their kind help.
文摘[目的]揭示萍乡碳储量时空分布特征,阐明土地地类变化与碳储量之间的关系,为探明区域生态系统碳储量状况提供数据支撑。[方法]利用FLUS(future land use simulation)模型与InVEST(integrated valuation of ecosystem services and trade-offs)模型,预测了2030年萍乡市3种不同情景下(自然发展、耕地保护和生态优先)碳储量值。[结果](1)2010—2020年萍乡市碳储量整体呈下降趋势,共减少1.47×10^(6)t;(2)耕地、建设用地、草地、水体和建设用地面积增加和林地与灌木面积减少,是导致碳储量变化的主要原因;(3)2030年自然发展、耕地保护和生态优先情景下陆地生态系统碳储量分别约为4.906×10^(7),4.919×10^(7),5.038×10^(7)t,其中生态优先情景下碳储量损失最少。[结论]萍乡生态系统碳储量呈下降趋势,主要受耕地与建设用地增大的影响,未来应加强对安源区与经济开发区重点变化区域的监测研究。
