Tibet

摘要： [Objectives]This study was conducted to investigate the variation characteristics of soil nutrient contents under different land use patterns in the middle and upper reaches of the Niyang River in Tibet.[Methods]With the cultivated land,grass land and forest land in the middle and upper reaches of the Niyang River as the research objects,216 soil samples were collected in layers(0-10,10-20,20-30 cm)by the standard sampling method,and the soil total nitrogen,alkali-hydrolyzable nitrogen,total potassium,available potassium,total phosphorus,available phosphorus and organic matter were determined.[Results]The contents of soil organic matter,total nitrogen and alkali-hydrolyzable nitrogen in the middle and upper reaches of Niyang River in Tibet ranked as forest land>grass land>cultivated land,and there were significant differences between the three(Pgrass land>cultivated land.The distribution of soil total nutrients and available nutrients under different land use patterns showed a certain degree of surface aggregation.The contents of total nutrients and available nutrients in the soil at the 0-10 cm depth were significantly higher than those at 10-20 and 20-30 cm,and there were significant differences between the three(P<0.05).The average content of alkali-hydrolyzable nitrogen was the largest in forest soil and the smallest in cultivated land under the three land use patterns in the study area.The average content of soil available phosphorus in cultivated land(19.47 mg/kg)was significantly higher than those in grass land(5.73 mg/kg)and forest land(5.19 mg/kg).The above results indicate that long-term vegetation restoration can improve the soil quality of the middle and upper reaches of the Niyang River.[Conclusions]The results of this study research provide basic support for improving the soil effect in the area.

摘要： [Objectives]To study the characteristics of bryophytes in subalpine cold zone and related transition zone.[Methods]The study was divided into scale A and scale B.On the scale of A,specimens were collected from Tongmai-Pailong-Dongjiu-Lulang-Sejila Pass-Nyingchi Town-Bagi Village along the national Highway 318.A sample plot was set for each 100 m altitude increase,and samples were collected between each two sample plots as well.On the scale of B,bryophyte specimens were collected and studied in the fixed sample plot of the Tibetan Nyingchi Alpine forest Ecosystem Research Observatory.[Results]Through the sampling and collection of bryophytes in Sejila Mountain,more than 3000 specimens were identified with the classical classification method.There were 216 species of bryophytes belonging to 82 genera and 24 families.The bryophytes in the study area differed obviously in different vegetation types and slopes.The species richness of Sabina saltuaria-Abiesgeorgei var.smithii forest was the highest.Theαdiversity of Abiesgeorgei var.smithii forest was the highest,followed by Sabina saltuaria-Rhododendron forest,and that of alpine shrub was the lowest.Diversity studies showed that theβdiversity of Sabina saltuaria-Rhododendron forest and Rhododendron forest on the eastern slope was the largest,and those of alpine shrub and Sabina saltuaria-Abiesgeorgei var.smithii forest were the lowest.However,theβdiversity of Abiesgeorgei var.smithii forest on the western slope was the highest,and those of alpine shrub and Abiesgeorgei var.smithii forest were the lowest.[Conclusions]There are obvious differences in the distribution of bryophytes on the eastern and western slopes of Sejila Mountain of Tibet.

摘要： Tibet marks 63rd anniversary of democratic reform People from all walks of life took part in activities to mark the Serfs’Emancipation Day in the Tibet Autonomous Region on March 28.More than 1,000 people attended a flag-raising ceremony at the Potala Palace Square in Lhasa to celebrate the 63rd anniversary since the launch of democratic reform in Tibet that saw people from all ethnic groups overthrow the region’s feudal serfdom under theocracy.

摘要： The first time I saw Padma Yudron was on the big screen during the women’s sport climbing finals at the 14th National Games of China in 2021.She struck me as a cheerful and confident girl.On that day,the 27-year-old won the first medal for Tibet in the games.

摘要： Flash flood is one of the major meteorological disasters on the Tibet Plateau (TP). Flash flood risk regionalization based on the theory of flash flood occurrence risk is the essential basis for relative risk management. The flash flood risk regionalization and the high-resolution grid mountain flood risk level in TP is carried out by using ArcGIS with the indicators of rainfall, days of heavy rain, vegetation cover, slope, relative elevation difference, river network density, population density, average GDP and traffic density. The areas with high mountain flood risk are mainly located in the middle and downstream of Yarlung, the Nujiang River Valley, the Jinsha River and Lancang River Basin. Besides, the results of flash flood disaster risk regionalization were tested by using historical flash flood disaster data and calamity census data. The disasters occurred in high-risk and sub-high-risk regions are accounted for 73%. Flash floods that cause casualties and economic losses of more than 100,000 CNY (Chinese Yuan) occurred in high-risk areas. Flash flood risk assessment may provide reference for the prevention and control of geological disasters in TP, improve disaster prevention and mitigation capabilities, reduce the hazards of flash floods to social development.

摘要： The Sangsdar Lungmgo grave site in the Tibet Autonomous Region was listed as one of China’s top 10archeological findings of 2020.The site,located in Zanda County,Ngari Prefecture,was excavated by a female archeological team with the Cultural Relics Conservation Institute of Tibet(CRCIT).

摘要： The Tiegelongnan Cu(Au,Ag)deposit in central Tibet contains more than 10 Mt of copper ranking 29 th in the world.It is characterized by typical porphyry-epithermal alteration and mineralization.In order to improve the understanding of porphyry-epithermal copper deposit in Tibet,new zircon U-Pb age and sulfur isotope data along with published data in the Tiegelongnan are presented to investigate the formation and preservation mechanism.Ore-related intrusive rocks in the Tiegelongnan including Early Cretaceous(about 120 Ma)granodiorite porphyry and diorite porphyry are closely related to the northward subduction of Bangongco-Nujiang ocean.Sulfur mainly comes from deep magma,and ore-forming fluid is affected by both magmatic and meteoric water.The metallogenic setting of Tiegelongnan is consistent with those of Andean porphyry copper deposits in South America.The cover of the Meiriqiecuo Formation volcanic rocks,Lhasa-Qiangtang collision and India-Eurasian collision have significance in the preservation and uplift of the deposit.The formation,preservation and discovery of Tiegelongnan play an important role in exploration of ancient porphyry-epithermal deposits in Tibet.

摘要： October 30,2021,the National Ski Mountaineering Invitational Competition(one of a series of activities of the 19th China’s Tibet Mountaineering Convention)kicked off at Luodui Peak,Damxung County of Lhasa City.This was the first event of its kind organized by the Tibet Autonomous Region to construct a competitive platform for professional skiers,upgrade their competitive capacities and skills.

摘要： [Objectives]This study was conducted to provide scientific basis for rational utilization and sustainable management of agricultural and forestry land resources in southeast Tibet.[Methods]Soil samples were stratified by standard sampling method(0-10,10-20,20-40,40-60 and 60-100 cm)in the lower reaches of Niyang River Basin under three different types of land cover of forest,grassland and farmland.The effects of different land use on soil properties were studied.[Results]Soil temperature and humidity affected soil properties together.The pH value and bulk density increased with the increase of soil depth for farmland,grassland and forest soil.Natural forest had the highest soil nutrient contents,followed by farmland,and grassland had the lowest soil nutrient contents.Soil organic carbon and organic nitrogen contents decreased with the increase of soil depth in the three land use patterns,and the surface aggregation of soil organic carbon and organic nitrogen was more obvious.Compared with natural vegetation,the organic carbon content of farmland was significantly reduced by 8.5%-15.3%and the organic nitrogen content by 11.1%-11.7%.[Conclusions]The change of land use is a proper way to benefit the development of soil properties and improve soil properties and quality in Niyang River Basin.

摘要： Bangong-Nujiang collisional zone(BNCZ)is an older one in Qinghai-Tibet Plateau and resulted in the famous Bangong-Nujiang metallogenic belt,which plays an important role in evaluating the formation and uplift mechanism of plateau.The northern and central Lhasa Terrane composed the southern part of the BNCZ.Since ore deposits can be used as markers of geodynamic evolution,the authors carried 1∶50000 stream sedimental geochemical exploration in the Xiongmei area in the Northern Lhasa Terrane to manifest the mineralization,and based on this mineralization with geochemical and chronological characteristics of related magmatic rocks to constrain their geodynamics and connection with the evolution of the Lhasa Terrane.The authors find Early Cretaceous magma mainly resulted in Cu,Mo mineralization,Late Cretaceous magma mainly resulted in Cu,Mo,and W mineralization in the studying area.The results suggest a southward subduction,slab rolling back and break-off,and thickened lithosphere delamination successively occurred within the Northern Lhasa Terrane.

摘要： The border trade between Tibet plateau and the South Asian could be dated back several centuries ago since Tang Period. However, in the modern times, such trade became much limiting and small-scaledthan before only with few countries including India, Nepal, Bhutan and etc. Generally speaking, the tradesituation is generally considered not good for many historical influential factors. Despite of this, with the central government's continuous supports particularly after the coming of Tibetan railroad and Sino-Indian relationship's improvement, it is believed that the present trade situations are predicted to ameliorate in the future.Moreover, considering the strategic importance of Tibetan area, this improvement would be also essential forthe long-term stable economic development for the whole country. Therefore, relevant analysis would bemade in the followingsearch methods. Afterchapters in order to make significance to this improvement through comparative rethat, suggestions and recommendations are provided based on the analysis.

摘要： The border trade between Tibet plateau and the South Asian could be dated back several centuries ago since Tang Period. However, in the modern times, such trade became much limiting and small-scaledthan before only with few countries including India, Nepal, Bhutan and etc. Generally speaking, the tradesituation is generally considered not good for many historical influential factors. Despite of this, with the central government's continuous supports particularly after the coming of Tibetan railroad and Sino-Indian relationship's improvement, it is believed that the present trade situations are predicted to ameliorate in the future.Moreover, considering the strategic importance of Tibetan area, this improvement would be also essential forthe long-term stable economic development for the whole country. Therefore, relevant analysis would bemade in the followingsearch methods. Afterchapters in order to make significance to this improvement through comparative rethat, suggestions and recommendations are provided based on the analysis.

摘要： The border trade between Tibet plateau and the South Asian could be dated back several centuries ago since Tang Period. However, in the modern times, such trade became much limiting and small-scaledthan before only with few countries including India, Nepal, Bhutan and etc. Generally speaking, the tradesituation is generally considered not good for many historical influential factors. Despite of this, with the central government's continuous supports particularly after the coming of Tibetan railroad and Sino-Indian relationship's improvement, it is believed that the present trade situations are predicted to ameliorate in the future.Moreover, considering the strategic importance of Tibetan area, this improvement would be also essential forthe long-term stable economic development for the whole country. Therefore, relevant analysis would bemade in the followingsearch methods. Afterchapters in order to make significance to this improvement through comparative rethat, suggestions and recommendations are provided based on the analysis.

摘要： The border trade between Tibet plateau and the South Asian could be dated back several centuries ago since Tang Period. However, in the modern times, such trade became much limiting and small-scaledthan before only with few countries including India, Nepal, Bhutan and etc. Generally speaking, the tradesituation is generally considered not good for many historical influential factors. Despite of this, with the central government's continuous supports particularly after the coming of Tibetan railroad and Sino-Indian relationship's improvement, it is believed that the present trade situations are predicted to ameliorate in the future.Moreover, considering the strategic importance of Tibetan area, this improvement would be also essential forthe long-term stable economic development for the whole country. Therefore, relevant analysis would bemade in the followingsearch methods. Afterchapters in order to make significance to this improvement through comparative rethat, suggestions and recommendations are provided based on the analysis.