Field research in this paper was carried out in Baiyinxil State-owned Rangeland （SOR）, which is 55 kms southeast of Xilingol City in Xilingol League, Inner Mongolia Autonomous Region （IMAR）. The area established t...Field research in this paper was carried out in Baiyinxil State-owned Rangeland （SOR）, which is 55 kms southeast of Xilingol City in Xilingol League, Inner Mongolia Autonomous Region （IMAR）. The area established the first grassland nature reserve in China as well as the first SOR in IMAR. By reviewing its 60 years of development, the paper analyzes local herders＇ ecological ideology （the cycle made of human-grassland-livestock and none of which could be neglected） and the modern nation-state＇s policy implementation in ecological resettlement, institutional changes, and livestock cross-breeding. The purpose of the research is to discuss three pairs of socio-ecological relationships in Inner Mongolia grassland： between population flow and regional development, traditional ideology and grassland management ideology, as well as the competition between local knowledge and modern science and technology. The author argues that grassland management is a cyclical process and the deterioration of grassland ecology in IMAR is simply a reflection of the imbalance of three key elements （human-institution-cattle） in maintaining grassland ecology.展开更多
Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of d...Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of different types are developed in the volcanic eruption belt.Maars are found for the first time in the study area,with those in Haotewula in the southeast of Abagaqi,and Chelewula and Esigewula in the northwest of Abagaqi to be the most representative.They all are large in scale,with cone diameters generally 3~4km,with the largest up to 6.5km.The maars show intact structure,a similar two-ringed mountain landscape and obviously phased eruption which contained a vigorous phreatomagmatic explosion at the earlier stage,and weak magmatic explosion at the later stage,and basaltic lava effusion in the last stage.The eruption sequence reflects the interaction between magma and water,the change of intrusive speed and outflow rate of magma.The Middle Pleistocene deposits of sand and gravel in the valley are covered by basal surge deposits.The TL age of sandstone-shale 'xenolith'which was found in the spatter deposits close to the crater is( 0.112 ± 0.0096) Ma,indicating that the eruption time of the Maars was the early Late Pleistocene.展开更多
Changes in soil organic carbon(SOC) in rangelands has been extensively investigated. Grazing in outlying rangeland areas has caused severe impacts on ecosystem functions. To reveal the effects of grazing on SOC, we ev...Changes in soil organic carbon(SOC) in rangelands has been extensively investigated. Grazing in outlying rangeland areas has caused severe impacts on ecosystem functions. To reveal the effects of grazing on SOC, we evaluated the grassland in Xilin Gol League, Inner Mongolia, China. Grazing intensity was determined by using two image sets of vegetation index with normalized differences in grazing periods(July 12 th and 28th). The range of variation in vegetation index was then used to measure the grazing intensity. The SOC storage and density were obtained by conducting experiments on field soil samples. Results showed that 1) the grazing intensity in Xilin Gol League declined gradually from west to east; by contrast, the spatial distribution of SOC density increased gradually. 2) As grazing intensity increased, the carbon storage of rangeland decreased evidently. Minimum carbon storage was observed in grasslands classified under extreme overgrazing; by comparison, maximum values were found in areas classified under light overgrazing to moderate grazing. 3) The estimated soil carbon storage was 8.48 × 10^(11) kg, and the average carbon density was 4.08 kg/m^2. Our research demonstrated that grazing intensity likely affects soil carbon. Moderate grazing is an optimum strategy to maintain carbon storage and ensure sustainable grassland utilization.展开更多
文摘Field research in this paper was carried out in Baiyinxil State-owned Rangeland （SOR）, which is 55 kms southeast of Xilingol City in Xilingol League, Inner Mongolia Autonomous Region （IMAR）. The area established the first grassland nature reserve in China as well as the first SOR in IMAR. By reviewing its 60 years of development, the paper analyzes local herders＇ ecological ideology （the cycle made of human-grassland-livestock and none of which could be neglected） and the modern nation-state＇s policy implementation in ecological resettlement, institutional changes, and livestock cross-breeding. The purpose of the research is to discuss three pairs of socio-ecological relationships in Inner Mongolia grassland： between population flow and regional development, traditional ideology and grassland management ideology, as well as the competition between local knowledge and modern science and technology. The author argues that grassland management is a cyclical process and the deterioration of grassland ecology in IMAR is simply a reflection of the imbalance of three key elements （human-institution-cattle） in maintaining grassland ecology.
基金sponsored by the Special Fund of Public Research,China Earthquake Administration(200782713)Special Fund of the Geological Heritage Protection,Department of Land and Resources,Inner Mongolia Autonomous Region,China(20101030)
文摘Located in Xilin Gol League of Inner Mongolia Autonomous Region,the Xilinhot-Abaga volcanic cluster is in the centre of the Daxing’anling-Datong volcanic eruption belt.More than 300 Quaternary basaltic volcanoes of different types are developed in the volcanic eruption belt.Maars are found for the first time in the study area,with those in Haotewula in the southeast of Abagaqi,and Chelewula and Esigewula in the northwest of Abagaqi to be the most representative.They all are large in scale,with cone diameters generally 3~4km,with the largest up to 6.5km.The maars show intact structure,a similar two-ringed mountain landscape and obviously phased eruption which contained a vigorous phreatomagmatic explosion at the earlier stage,and weak magmatic explosion at the later stage,and basaltic lava effusion in the last stage.The eruption sequence reflects the interaction between magma and water,the change of intrusive speed and outflow rate of magma.The Middle Pleistocene deposits of sand and gravel in the valley are covered by basal surge deposits.The TL age of sandstone-shale 'xenolith'which was found in the spatter deposits close to the crater is( 0.112 ± 0.0096) Ma,indicating that the eruption time of the Maars was the early Late Pleistocene.
基金National Natural Science Foundation of China,No.41671080
文摘Changes in soil organic carbon(SOC) in rangelands has been extensively investigated. Grazing in outlying rangeland areas has caused severe impacts on ecosystem functions. To reveal the effects of grazing on SOC, we evaluated the grassland in Xilin Gol League, Inner Mongolia, China. Grazing intensity was determined by using two image sets of vegetation index with normalized differences in grazing periods(July 12 th and 28th). The range of variation in vegetation index was then used to measure the grazing intensity. The SOC storage and density were obtained by conducting experiments on field soil samples. Results showed that 1) the grazing intensity in Xilin Gol League declined gradually from west to east; by contrast, the spatial distribution of SOC density increased gradually. 2) As grazing intensity increased, the carbon storage of rangeland decreased evidently. Minimum carbon storage was observed in grasslands classified under extreme overgrazing; by comparison, maximum values were found in areas classified under light overgrazing to moderate grazing. 3) The estimated soil carbon storage was 8.48 × 10^(11) kg, and the average carbon density was 4.08 kg/m^2. Our research demonstrated that grazing intensity likely affects soil carbon. Moderate grazing is an optimum strategy to maintain carbon storage and ensure sustainable grassland utilization.
