Objective Any natural system is constantly exchanging material, energy and information with the environment, and all tkese processes follow the basic law of thermodynamics, with no exception of groundwater recharge a...Objective Any natural system is constantly exchanging material, energy and information with the environment, and all tkese processes follow the basic law of thermodynamics, with no exception of groundwater recharge and discharge process. On the basis of the principle of the first law of thermodynamics, the reverse geochemical simulation method is widely used in the study of groundwater recharge, runoff and drainage process. However, some studies only consider the material conservation in theprocess, but ignore the probability of the transformation.展开更多
The Middle Route of the South-to-North Water Diversion Project(MR-SNWDP)in China,with construction beginning in 2003,diverts water from Danjiangkou Reservoir to North China for residential,agriculture and industrial u...The Middle Route of the South-to-North Water Diversion Project(MR-SNWDP)in China,with construction beginning in 2003,diverts water from Danjiangkou Reservoir to North China for residential,agriculture and industrial use.The water source area of the MR-SNWDP is the region that is most sensitive to and most affected by the construction of this water diversion project.In this study,we used Landsat Thematic Mapper(TM)and HJ-1 A/B images from 2000 to 2015 by an object-based approach with a hierarchical classification method for mapping land cover in the water source area.The changes in land cover were illuminated by transfer matrixes,single dynamic degree,slope zones and fractional vegetation cover(FVC).The results indicated that the area of cropland decreased by 31%and was replaced mainly by shrub over the past 15 years,whereas forest and settlements showed continuous increases of 29.2% and 77.7%,respectively.The changes in cropland were obvious in all slope zones and decreased most remarkably(–43.8%)in the slope zone above 25°.Compared to the FVC of forest and shrub,significant improvement was exhibited in the FVC of grassland,with a growth rate of 16.6%.We concluded that local policies,including economic development,water conservation and immigration resulting from the construction of the MR-SNWDP,were the main drivers of land cover changes;notably,they stimulated the substantial and rapid expansion of settlements,doubled the wetlands and drove the transformation from cropland to settlements in immigration areas.展开更多
North China is a key region for studying geophysical progress. In this study, ground-based and Gravity Recovery and Climate Experiment（GRACE） gravity data from 2009 to 2013 are used to calculate the gravity change r...North China is a key region for studying geophysical progress. In this study, ground-based and Gravity Recovery and Climate Experiment（GRACE） gravity data from 2009 to 2013 are used to calculate the gravity change rate（GCR） using the polynomial fitting method. In general, the study area was divided into the Shanxi rift, Jing-Jin-Ji（Beijing-Tianjin-Hebei Province）, and Bohai Bay Basin（BBB） regions. Results of the distribution of the GCR determined from ground-based gravimetry show that the GCR appears to be ＂negativepositive-negative＂ from west to east, which indicates that different geophysical mechanisms are involved in the tectonic activities of these regions. However, GRACE solutions are conducted over a larger spatial scale and are able to show a difference between southern and northern areas and a mass redistribution of land water storage.展开更多
During the 1940s, the Chinese Communist revolutionary bases in North China experienced a sharp increase in divorces in which wives cast off their husbands. This was due in great part to the promulgation of a series of...During the 1940s, the Chinese Communist revolutionary bases in North China experienced a sharp increase in divorces in which wives cast off their husbands. This was due in great part to the promulgation of a series of marriage regulations and to the Party＇s extensive mobilization of women. Examining both the public and private domains in terms of changes affecting tradition, revolution, and gender, the authors investigate the ways that marriage transformation intertwined with national wars, political changes, and gender liberation. Our analysis reveals that marriage institutions experienced a severe crisis as traditional needs and new longings, such as marriage freedom, wartime needs, and the stability of rural traditions, family, and social structures, intersected. The Chinese Communist regime carried out successive adjustments in marriage policies as they affected women. With Party support, the paradigm of ＂wives divorcing husbands＂ became de facto marriage policy in order to adapt to resolve conflicts between emotions and the law and to meet the requirements of rural society and military stability. Seeking to shake off the traditional ＂oppression-liberation＂ paradigm, the research in the present article tries to combine the study of female existences, marriage, and the relevant emotions with rural traditions and the historical background of wartime China, so as to explain the changes in women＇s marital status and the nature and significance of their so-called liberation in wartime revolutionary bases in North China.展开更多
Regional ozone （O3） pollution has drawn increasing attention in China over the recent decade, but the contributions from urban pollution and biogenic emissions have not been clearly elucidated. To better understand ...Regional ozone （O3） pollution has drawn increasing attention in China over the recent decade, but the contributions from urban pollution and biogenic emissions have not been clearly elucidated. To better understand the formation of the regional O3 problem in the North China Plain （NCP）, intensive field measurements of O3 and related parameters were conducted at a rural site downwind of Ji＇nan, the capital city of Shandong province, in the summer of 2013. Markedly severe 03 pollution was recorded, with the 03 mixing ratios exceeding the Chinese national ambient air quality standard on 28 days （a frequency of 78%） and with a maximum hourly value of 198 ppbv. Extensive regional transport of well-processed urban plumes to the site was identified. An observation-constrained chemical box model was deployed to evaluate in situ photochemical O3 production on two episodes. The results show that the in situ formation accounted for approximately 46% of the observed O3 accumulation, while the remainder （54%） was contributed by regional transport of the O3-laden urban plumes. The in situ ozone production was in a mixed controlled regime that reducing either NOx or VOCs would lead to a reduction of ozone formation. Biogenic VOCs played an important role in the local ozone formation. This study demonstrates the significant mixed effects of both anthropogenic pollution from urban zones and biogenic emission in rural areas on the regional 03 pollution in the NCP region, and may have general applicability in facilitating the understanding of the formation of secondary pollution over China.展开更多
College of Resources and Environment/Sino-Danish Center, Univers Beijing 100049, China nstitute of Geographic Sciences and ty of Chinese Academy of SciencesAbstract： Quantifying the contributions of climate change a...College of Resources and Environment/Sino-Danish Center, Univers Beijing 100049, China nstitute of Geographic Sciences and ty of Chinese Academy of SciencesAbstract： Quantifying the contributions of climate change and human activities to ecosystem evapotranspiration （ET） and gross primary productivity （GPP） changes is important for adaptation assessment and sustainable development. Spatiotemporal patterns of ET and GPP were estimated from 2000 to 2014 over North China Plain （NCP） with a physical and remote sensing-based model. The contributions of climate change and human activities to ET and GPP trends were separated and quantified by the first difference de-trending method and multivariate regression. Results showed that annual ET and GPP increased weakly, with climate change and human activities contributing 0.188 mm yr-2 and 0.466 mm yr-2 to ET trend of 0.654 mm yr-2, and -1.321 g C m-2 yr-2 and 7.542 g C m-2 yr-2 to GPP trend of 6.221 g C m-2 yr-2, respectively. In cropland, the increasing trends mainly occurred in wheat growing stage; the contributions of climate change to wheat and maize were both negative. Precipitation and sunshine duration were the major climatic factors regulating ET and GPP trends. It is concluded that human activities are the main drivers to the long term tendencies of water consumption and gross primary productivity in the NCP.展开更多
Since 1949,Chinese mainland historians and creators in film and television,novels,and reportage have continued to shape the heroic image of female groups in the base areas of the Communist Party of China(CPC)during th...Since 1949,Chinese mainland historians and creators in film and television,novels,and reportage have continued to shape the heroic image of female groups in the base areas of the Communist Party of China(CPC)during the Anti-Japanese War.They participated in production,women's mobilization,and reconstruction of the rural political order Tike men.55 They pursued the equality between men and women,marked by freedom of marriage,and also participated in regional guerrilla warfare to combat the Japanese puppet army"as men."However,in the remote villages of north China at the end of the Qing dynasty and the beginning of the Republic of China,it was not common for women to unbind their feet.In wartime,most women over twenty years of age were forever left with the"three-inch golden lotus"(sancun jinlian)feet.The damage of the war accelerated their acceptance of the CPC's emancipation concepts and policies and presented them with an opportunity to actively implement them.The experience of survival drastically changed traditional aesthetics,ideas,and customs related to women.Physical and psychological changes occurred as a result of the war;women began to go out of their homes to participate in the work of the Women's Salvation Association and the Youth Salvation Association,and a group of women achieved marriage equality between men and women in the form of"divorce her husband"(qi xiu fu).Due to pressure,women carried more physical and mental responsibilities,faced insufficient advocacy for their rights,and the aesthetics and mentality of womanhood underwent change.展开更多
基金granted by the National Natural Science Fund of China(Grant no.51578212)
文摘Objective Any natural system is constantly exchanging material, energy and information with the environment, and all tkese processes follow the basic law of thermodynamics, with no exception of groundwater recharge and discharge process. On the basis of the principle of the first law of thermodynamics, the reverse geochemical simulation method is widely used in the study of groundwater recharge, runoff and drainage process. However, some studies only consider the material conservation in theprocess, but ignore the probability of the transformation.
基金Under the auspices of the National Key Research and Development Program of China(No.2016YFC0500201-01)National Natural Science Foundation of China(No.41671365,41771464)the Annual Project of the Office of the South-to-North Water Diversion Project(No.2018-21)
文摘The Middle Route of the South-to-North Water Diversion Project(MR-SNWDP)in China,with construction beginning in 2003,diverts water from Danjiangkou Reservoir to North China for residential,agriculture and industrial use.The water source area of the MR-SNWDP is the region that is most sensitive to and most affected by the construction of this water diversion project.In this study,we used Landsat Thematic Mapper(TM)and HJ-1 A/B images from 2000 to 2015 by an object-based approach with a hierarchical classification method for mapping land cover in the water source area.The changes in land cover were illuminated by transfer matrixes,single dynamic degree,slope zones and fractional vegetation cover(FVC).The results indicated that the area of cropland decreased by 31%and was replaced mainly by shrub over the past 15 years,whereas forest and settlements showed continuous increases of 29.2% and 77.7%,respectively.The changes in cropland were obvious in all slope zones and decreased most remarkably(–43.8%)in the slope zone above 25°.Compared to the FVC of forest and shrub,significant improvement was exhibited in the FVC of grassland,with a growth rate of 16.6%.We concluded that local policies,including economic development,water conservation and immigration resulting from the construction of the MR-SNWDP,were the main drivers of land cover changes;notably,they stimulated the substantial and rapid expansion of settlements,doubled the wetlands and drove the transformation from cropland to settlements in immigration areas.
基金supported by the National Natural Science Foundation of China(41304060)the national key basic research and development plan(2013CB733304)
文摘North China is a key region for studying geophysical progress. In this study, ground-based and Gravity Recovery and Climate Experiment（GRACE） gravity data from 2009 to 2013 are used to calculate the gravity change rate（GCR） using the polynomial fitting method. In general, the study area was divided into the Shanxi rift, Jing-Jin-Ji（Beijing-Tianjin-Hebei Province）, and Bohai Bay Basin（BBB） regions. Results of the distribution of the GCR determined from ground-based gravimetry show that the GCR appears to be ＂negativepositive-negative＂ from west to east, which indicates that different geophysical mechanisms are involved in the tectonic activities of these regions. However, GRACE solutions are conducted over a larger spatial scale and are able to show a difference between southern and northern areas and a mass redistribution of land water storage.
文摘During the 1940s, the Chinese Communist revolutionary bases in North China experienced a sharp increase in divorces in which wives cast off their husbands. This was due in great part to the promulgation of a series of marriage regulations and to the Party＇s extensive mobilization of women. Examining both the public and private domains in terms of changes affecting tradition, revolution, and gender, the authors investigate the ways that marriage transformation intertwined with national wars, political changes, and gender liberation. Our analysis reveals that marriage institutions experienced a severe crisis as traditional needs and new longings, such as marriage freedom, wartime needs, and the stability of rural traditions, family, and social structures, intersected. The Chinese Communist regime carried out successive adjustments in marriage policies as they affected women. With Party support, the paradigm of ＂wives divorcing husbands＂ became de facto marriage policy in order to adapt to resolve conflicts between emotions and the law and to meet the requirements of rural society and military stability. Seeking to shake off the traditional ＂oppression-liberation＂ paradigm, the research in the present article tries to combine the study of female existences, marriage, and the relevant emotions with rural traditions and the historical background of wartime China, so as to explain the changes in women＇s marital status and the nature and significance of their so-called liberation in wartime revolutionary bases in North China.
基金funded by the Taishan Scholar Grand (No. ts20120552)the National Natural Science Foundation of China (No. 41375126)+2 种基金supported by the National Natural Science Foundation of China (No. 41675118)the Qilu Youth Talent Programme of Shandong Universitythe Jiangsu Collaborative Innovation Center for Climate Change
文摘Regional ozone （O3） pollution has drawn increasing attention in China over the recent decade, but the contributions from urban pollution and biogenic emissions have not been clearly elucidated. To better understand the formation of the regional O3 problem in the North China Plain （NCP）, intensive field measurements of O3 and related parameters were conducted at a rural site downwind of Ji＇nan, the capital city of Shandong province, in the summer of 2013. Markedly severe 03 pollution was recorded, with the 03 mixing ratios exceeding the Chinese national ambient air quality standard on 28 days （a frequency of 78%） and with a maximum hourly value of 198 ppbv. Extensive regional transport of well-processed urban plumes to the site was identified. An observation-constrained chemical box model was deployed to evaluate in situ photochemical O3 production on two episodes. The results show that the in situ formation accounted for approximately 46% of the observed O3 accumulation, while the remainder （54%） was contributed by regional transport of the O3-laden urban plumes. The in situ ozone production was in a mixed controlled regime that reducing either NOx or VOCs would lead to a reduction of ozone formation. Biogenic VOCs played an important role in the local ozone formation. This study demonstrates the significant mixed effects of both anthropogenic pollution from urban zones and biogenic emission in rural areas on the regional 03 pollution in the NCP region, and may have general applicability in facilitating the understanding of the formation of secondary pollution over China.
基金National Natural Science Foundation of China, No.41471026 National Key Research and Development Program of China, No.2016YFC0401402Acknowledgment We thank to all the data providers. We also appreciate editors and reviewers for their constructive comments and suggestions. Finally, the first author is grateful to the invaluable support received from doctoral student ZOU Yi.
文摘College of Resources and Environment/Sino-Danish Center, Univers Beijing 100049, China nstitute of Geographic Sciences and ty of Chinese Academy of SciencesAbstract： Quantifying the contributions of climate change and human activities to ecosystem evapotranspiration （ET） and gross primary productivity （GPP） changes is important for adaptation assessment and sustainable development. Spatiotemporal patterns of ET and GPP were estimated from 2000 to 2014 over North China Plain （NCP） with a physical and remote sensing-based model. The contributions of climate change and human activities to ET and GPP trends were separated and quantified by the first difference de-trending method and multivariate regression. Results showed that annual ET and GPP increased weakly, with climate change and human activities contributing 0.188 mm yr-2 and 0.466 mm yr-2 to ET trend of 0.654 mm yr-2, and -1.321 g C m-2 yr-2 and 7.542 g C m-2 yr-2 to GPP trend of 6.221 g C m-2 yr-2, respectively. In cropland, the increasing trends mainly occurred in wheat growing stage; the contributions of climate change to wheat and maize were both negative. Precipitation and sunshine duration were the major climatic factors regulating ET and GPP trends. It is concluded that human activities are the main drivers to the long term tendencies of water consumption and gross primary productivity in the NCP.
文摘Since 1949,Chinese mainland historians and creators in film and television,novels,and reportage have continued to shape the heroic image of female groups in the base areas of the Communist Party of China(CPC)during the Anti-Japanese War.They participated in production,women's mobilization,and reconstruction of the rural political order Tike men.55 They pursued the equality between men and women,marked by freedom of marriage,and also participated in regional guerrilla warfare to combat the Japanese puppet army"as men."However,in the remote villages of north China at the end of the Qing dynasty and the beginning of the Republic of China,it was not common for women to unbind their feet.In wartime,most women over twenty years of age were forever left with the"three-inch golden lotus"(sancun jinlian)feet.The damage of the war accelerated their acceptance of the CPC's emancipation concepts and policies and presented them with an opportunity to actively implement them.The experience of survival drastically changed traditional aesthetics,ideas,and customs related to women.Physical and psychological changes occurred as a result of the war;women began to go out of their homes to participate in the work of the Women's Salvation Association and the Youth Salvation Association,and a group of women achieved marriage equality between men and women in the form of"divorce her husband"(qi xiu fu).Due to pressure,women carried more physical and mental responsibilities,faced insufficient advocacy for their rights,and the aesthetics and mentality of womanhood underwent change.
