Sand-dust storms are the result of the integrated influences of climate, geography, society and human factors. A theoretical framework is built to explain the coherence of population growth, agriculture change and env...Sand-dust storms are the result of the integrated influences of climate, geography, society and human factors. A theoretical framework is built to explain the coherence of population growth, agriculture change and environmental degradation. On the basis of the analysis of the causes of the sand-dust storm in terms of human factors, a discussion will be given to show that these factors are internally consistent with the theoretical framework. After that, it will look at China's Agenda 21 and try to find relevant measures to reduce such large sand-dust storms happening in Northwest China and eventually make this area develop sustainably.展开更多
Data User Service(DUS)offers you any data on China's population and rclated socioec onomic data--total population,age-sex composition,population density,labour force and more--to help you do demographic research,m...Data User Service(DUS)offers you any data on China's population and rclated socioec onomic data--total population,age-sex composition,population density,labour force and more--to help you do demographic research,make investments in China and so on.展开更多
APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,peop...APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,people began to raise livestock and live a more sedentary life.Clan villages appeared.However,because of natural disasters and other factors,the primitive people had to constantly change their habitats.Over time,these habitats submerged into ruins,which became bases for archaeologistss in their study of primitive man and his social conditions.展开更多
This paper reviews the progress of population geography in China since the 1980 s. The review results suggest that contrary to the common perception of its invisibility and marginalized status in the field, tremendous...This paper reviews the progress of population geography in China since the 1980 s. The review results suggest that contrary to the common perception of its invisibility and marginalized status in the field, tremendous progress has been made in population geography in China since the 1980 s. Population geographers have made significant contribution to the understanding of a wide range of population issues from geographical perspectives, including migration, urbanization, population distribution, the relationships between population, environment and resources, aging, marriage patterns, and migrants＇ crimes, although such contribution often did not appear in the geographical circle. Furthermore, population geographers have played an indispensable role in revitalizing population studies in China and forging its links to human geography, occupying an important position in this multi-disciplinary field. Population geographers＇ contribution to the areas of migration and urbanization research has been particularly significant, reflected in their leading roles in these areas＇ research. The paper demonstrates that as latecomers in the field after more than 20 years of isolation, population geographers in China have gone through a process of catching up and increasing engagement with developments in social sciences and increasing interaction with social scientists since the 1980 s, and have benefited greatly from it; however, there is a tendency for population geography to be increasingly alienated from the main stream human geography, a phenomenon similar to but not exactly the same as Anglo-American geography in the late 1990 s and early 2000 s. The paper argues that population geography is only half way in the course to forge the links between population studies and human geography, and it needs to return to geographical sciences to strike a healthy balance between the field of population studies and that of human geography, and promote its further development in a multi-disciplinary field.展开更多
On the basis of the analysis of the standards for the city/town populationstatistics in the past censuses,the author makes a proportional analysis of the city/townpopulation according to the data obtained from the fou...On the basis of the analysis of the standards for the city/town populationstatistics in the past censuses,the author makes a proportional analysis of the city/townpopulation according to the data obtained from the fourth census,and points out the dis-crepancies in the standard for the the city/town population statistics used in the fourthcensus and proposes ways for their correction.展开更多
HAIXIA, a young housekeeper working for my family, left her hometown in Wuwei County, Anhui Province, and came to Beijing two years ago when she was only 18 years of age. Her older sister and cousin also work as house...HAIXIA, a young housekeeper working for my family, left her hometown in Wuwei County, Anhui Province, and came to Beijing two years ago when she was only 18 years of age. Her older sister and cousin also work as housekeepers in our neighborhood compound. The older relatives, both of whom have worked in Beijing for a number of years, visited their hometown and convinced Haixia to come to the city to seek work. Just as many other young village women, Haixia graduated from junior middle school and failed to展开更多
An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage...An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage water from coast, seepage water from ancient wood layer, intertidal seawater, fresh water, beach mud, ancient wood barks and ancient peat, were collected for geochemical analysis. The beach mud and the bacteriogenic iron oxides (BIOS) in coastal seepage water were analyzed by min-eralogical and high-resolution transmission electron microscopy (HRTEM)-selected area electron dif-fraction (SAED) analysis. Inorganic sulfur compositions and δ34S of the ancient peat and the beach mud were determined. The results showed that Fe, Mn, S (SO42-) were enriched in the intertidal area at different levels, very likely caused by fermentation of ancient woods. The presence of abundant iron-oxidizing bacteria (FeOB) and sulfate-reducing bacteria (SRB) in this intertidal zone was confirmed by HRTEM-SAED observation, and these bacteria were involved in Fe-S cycle to induce extracellular biomineralization. The negative δ34SV-CDT (-2.9‰) likely indicated the biogenic origin of iron-sulfide minerals in the beach mud at high sulfate reduction rate (SRR). These findings are helpful for under-standing the biogeochemical Fe-S cycle and biomineralization process at high organic matter deposition rate and high SRR in the intertidal zone, estuary, or near shoreline.展开更多
文摘Sand-dust storms are the result of the integrated influences of climate, geography, society and human factors. A theoretical framework is built to explain the coherence of population growth, agriculture change and environmental degradation. On the basis of the analysis of the causes of the sand-dust storm in terms of human factors, a discussion will be given to show that these factors are internally consistent with the theoretical framework. After that, it will look at China's Agenda 21 and try to find relevant measures to reduce such large sand-dust storms happening in Northwest China and eventually make this area develop sustainably.
文摘Data User Service(DUS)offers you any data on China's population and rclated socioec onomic data--total population,age-sex composition,population density,labour force and more--to help you do demographic research,make investments in China and so on.
文摘APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,people began to raise livestock and live a more sedentary life.Clan villages appeared.However,because of natural disasters and other factors,the primitive people had to constantly change their habitats.Over time,these habitats submerged into ruins,which became bases for archaeologistss in their study of primitive man and his social conditions.
基金National Natural Science Foundation of China,No.41471132,No.41501163
文摘This paper reviews the progress of population geography in China since the 1980 s. The review results suggest that contrary to the common perception of its invisibility and marginalized status in the field, tremendous progress has been made in population geography in China since the 1980 s. Population geographers have made significant contribution to the understanding of a wide range of population issues from geographical perspectives, including migration, urbanization, population distribution, the relationships between population, environment and resources, aging, marriage patterns, and migrants＇ crimes, although such contribution often did not appear in the geographical circle. Furthermore, population geographers have played an indispensable role in revitalizing population studies in China and forging its links to human geography, occupying an important position in this multi-disciplinary field. Population geographers＇ contribution to the areas of migration and urbanization research has been particularly significant, reflected in their leading roles in these areas＇ research. The paper demonstrates that as latecomers in the field after more than 20 years of isolation, population geographers in China have gone through a process of catching up and increasing engagement with developments in social sciences and increasing interaction with social scientists since the 1980 s, and have benefited greatly from it; however, there is a tendency for population geography to be increasingly alienated from the main stream human geography, a phenomenon similar to but not exactly the same as Anglo-American geography in the late 1990 s and early 2000 s. The paper argues that population geography is only half way in the course to forge the links between population studies and human geography, and it needs to return to geographical sciences to strike a healthy balance between the field of population studies and that of human geography, and promote its further development in a multi-disciplinary field.
文摘On the basis of the analysis of the standards for the city/town populationstatistics in the past censuses,the author makes a proportional analysis of the city/townpopulation according to the data obtained from the fourth census,and points out the dis-crepancies in the standard for the the city/town population statistics used in the fourthcensus and proposes ways for their correction.
文摘HAIXIA, a young housekeeper working for my family, left her hometown in Wuwei County, Anhui Province, and came to Beijing two years ago when she was only 18 years of age. Her older sister and cousin also work as housekeepers in our neighborhood compound. The older relatives, both of whom have worked in Beijing for a number of years, visited their hometown and convinced Haixia to come to the city to seek work. Just as many other young village women, Haixia graduated from junior middle school and failed to
基金Supported by the Project of the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-151)
文摘An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage water from coast, seepage water from ancient wood layer, intertidal seawater, fresh water, beach mud, ancient wood barks and ancient peat, were collected for geochemical analysis. The beach mud and the bacteriogenic iron oxides (BIOS) in coastal seepage water were analyzed by min-eralogical and high-resolution transmission electron microscopy (HRTEM)-selected area electron dif-fraction (SAED) analysis. Inorganic sulfur compositions and δ34S of the ancient peat and the beach mud were determined. The results showed that Fe, Mn, S (SO42-) were enriched in the intertidal area at different levels, very likely caused by fermentation of ancient woods. The presence of abundant iron-oxidizing bacteria (FeOB) and sulfate-reducing bacteria (SRB) in this intertidal zone was confirmed by HRTEM-SAED observation, and these bacteria were involved in Fe-S cycle to induce extracellular biomineralization. The negative δ34SV-CDT (-2.9‰) likely indicated the biogenic origin of iron-sulfide minerals in the beach mud at high sulfate reduction rate (SRR). These findings are helpful for under-standing the biogeochemical Fe-S cycle and biomineralization process at high organic matter deposition rate and high SRR in the intertidal zone, estuary, or near shoreline.
