Lop Nur is located at the eastmost end of the Tarim Basin in Xinjiang,Northwestern China.This study reviews the hydrochemical characteristics and evolution of underground brine in Lop Nur,based on analytical data from...Lop Nur is located at the eastmost end of the Tarim Basin in Xinjiang,Northwestern China.This study reviews the hydrochemical characteristics and evolution of underground brine in Lop Nur,based on analytical data from 429 water samples(mainly brine).It is found that in the NE-SW direction,from the periphery to the Luobei sub-depression,while the hydrochemical type varies from the sodium sulfate subtype(S)to the magnesium sulfate subtype(M),the corresponding brine in the phase diagram transfers from the thenardite phase(Then)area,through the bloedite phase(Blo),epsomite phase(Eps),picromerite phase(Picro),finally reaching the sylvite phase(Syl)area.As for the degree of evolution,the sequence is the periphery<Luobei horizontally and the overlying glauberite brine<the underlying clastic brine vertically.It is concluded that the oxygen and hydrogen isotopic compositions of the brine have evidently been affected through the effects of evaporation and altitude,as well as the changes in local water circulation in recent years.Boron and chloride isotopic compositions show that the glauberite brine is formed under more arid conditions than the clastic one.The strontium isotopic composition indicates that the Lop Nur brine primarily originates from surface water;however,deep recharge may also be involved in the evolution of the brine,according to previous noble gas studies.It is confirmed that the brine in Lop Nur has become enriched with potassium prior to halite precipitation over the full course of the salt lake's evolution.Based on chemical compositions of brine from drillhole LDK01 and previous lithological studies,the evolution of the salt lake can be divided into three stages and it is inferred that the brine in Lop Nur may have undergone at least two significant concentration-dilution periods.展开更多
The change in the ecological environment in the arid core area is a critical issue in the context of global warming.To study the paleoclimate evolution,precise identification of minerals deposited in Asia’s arid hint...The change in the ecological environment in the arid core area is a critical issue in the context of global warming.To study the paleoclimate evolution,precise identification of minerals deposited in Asia’s arid hinterland,Lop Nur Salt Lake,NW China was conducted.The hyperspectral data of the salt crust was sampled to identify the species and content of sedimentary minerals,and the multispectral photos were used to reconstruct the salt crust morphology using the unmanned aerial vehicles platform.The SUnSAL(sparse unmixing by variable splitting and augmented Lagrangian)method was employed to inverse the sedimentary mineral components along the shoreline.The heterogeneity of salt and clay minerals in bright and dark ear-shaped strips was evaluated.The paleoclimatic environment associated with salt lake extinction was reconstructed by analyzing paleoclimate records of sediments,spectral reflectance and morphology of the salt crust.Results show that:(1)the variations in the micro-geomorphology of the salt crust are obviously the reason for the formation of bright and dark ear-shaped strips and the differences in the species and relative content of the sedimentary minerals are the microscopic reason.The high ratio of sedimentary salt minerals to clay minerals(RS/C)contributes to the high reflectivity,and the salt crust presents a bright texture.The low RS/C results in the low reflectivity,salt crust presents a dark texture;(2)the bright and dark ear-shaped strips represent warm-arid and cold-humid climates.The shape of the Lop Nur Lake shoreline evolved due to alternating warm-dry and cold-humid paleoclimate changes.展开更多
Bamboos are used extensively for a variety of purposes,and many new species have been introduced to the northwestern Himalaya.However,their potential as a fodder species has not been investigated.Six bamboo species,na...Bamboos are used extensively for a variety of purposes,and many new species have been introduced to the northwestern Himalaya.However,their potential as a fodder species has not been investigated.Six bamboo species,namely Dendrocalamus hamiltonii Gamble,Dendrocalamus asper(Schult.and Schult.f.)Backer ex K.Heyne,Melocanna baccifera(Roxb.)Kurz,Phyllostachys aurea Rivie′re and C.Rivie′re,Phyllostachys bambusoides Sieb and Zucc.and Phyllostachys pubescens(Pradelle)Mazel ex J.Houz.were evaluated for their nutritional value,relative palatability and best lopping time.Dry matter(DM),ether extract(EE),and crude fibre varied from(37.0-67.7)%,(4.7-7.6),and(22.1-37.9)%,respectively.Values of crude protein ranged from(12.2-17.1)%,total ash(TA)from(11.8-21.5)%,acid insoluble ash(AIA)from(0.3-0.5)%,nitrogen free extract from(31.1-40.8)%,carbohydrates from(57.0-69.0)%,organic matter(OM)from(78.5-88.2)%,calcium from(1.7-2.3)%,phosphorus from(0.4-0.8)%,potassium from,(0.9-1.6)%,magnesium from(0.5-0.9)%,sodium from(603.7-1072.7)×10^-6 and vitamin A from(21.1-30.5)×10^-2 mg/g,respectively.D.hamiltonii had maximum values for DM,EE,TA and AIA.OM and vitamin A were highest in M.baccifera.CF and carbohydrates were maximized in P.aurea and CP in P.pubescens.All the values obtained for different bamboo species were less than maximum tolerable concentration of common feed resources of the region thereby indicating their suitability for nutrition and palatability.The contents of anti-nutritional factors,namely hydrocyanic acid and tannin ranged from(33.8-61.7)×10^-2 mg/g and(0.7-1.9)%,respectively.P.pubescens was the best species from a palatability point of view and has maximum crude protein content(17.2%),Ca(2.3%)and lowest tannin content(0.7%).The relative palatability of introduced bamboo species followed trend:P.pubescens(97.6%)[D.hamiltonii(92.5%)[P.bambusoides(81.2%)[D.asper(76.9%)[M.baccifera(75.9%)[P.aurea(73.4%).The optimum months for lopping these species for green leaves are November and December,as the nutritional value declines sharply thereafter.展开更多
Lop Nur potash mine greening projects is located in the heart of the Lop Nur, known as the ＂green zone ban＂. The project overcomes the extreme drought, high temperature, gale and dust salt and salt, and many other a...Lop Nur potash mine greening projects is located in the heart of the Lop Nur, known as the ＂green zone ban＂. The project overcomes the extreme drought, high temperature, gale and dust salt and salt, and many other adverse environmen- tal factors. Adopted the suitable salt improvement measures and management tech- nology, the artificial green has emerged in the sea of death. At the same time the greening project improved the office environment of mining area, and shaped ex- treme environment greening projects successful cases.展开更多
在建设和管理网络教学资源的过程中,面临着遇到灾害使教学资源损坏,造成巨大损失的问题。所以建立完善有效的容灾系统,是保障教学资源信息安全的必不可少的一项重要措施。本文提出了一种基于SQL Server Log Shipping的容灾系统,能够对...在建设和管理网络教学资源的过程中,面临着遇到灾害使教学资源损坏,造成巨大损失的问题。所以建立完善有效的容灾系统,是保障教学资源信息安全的必不可少的一项重要措施。本文提出了一种基于SQL Server Log Shipping的容灾系统,能够对本地服务器的数据进行异地存储和恢复,保证了系统在发生灾难时能够继续保持业务的连续性。展开更多
基金The Major Projects of Xinjiang Uyghur Autonomous Region of China(Grant Nos.2020A03005-2 and 2022A03009-2)from the Chinese governmentthe National Natural Science Foundation of China(Grant No.40830420)provided the funding for this study。
文摘Lop Nur is located at the eastmost end of the Tarim Basin in Xinjiang,Northwestern China.This study reviews the hydrochemical characteristics and evolution of underground brine in Lop Nur,based on analytical data from 429 water samples(mainly brine).It is found that in the NE-SW direction,from the periphery to the Luobei sub-depression,while the hydrochemical type varies from the sodium sulfate subtype(S)to the magnesium sulfate subtype(M),the corresponding brine in the phase diagram transfers from the thenardite phase(Then)area,through the bloedite phase(Blo),epsomite phase(Eps),picromerite phase(Picro),finally reaching the sylvite phase(Syl)area.As for the degree of evolution,the sequence is the periphery<Luobei horizontally and the overlying glauberite brine<the underlying clastic brine vertically.It is concluded that the oxygen and hydrogen isotopic compositions of the brine have evidently been affected through the effects of evaporation and altitude,as well as the changes in local water circulation in recent years.Boron and chloride isotopic compositions show that the glauberite brine is formed under more arid conditions than the clastic one.The strontium isotopic composition indicates that the Lop Nur brine primarily originates from surface water;however,deep recharge may also be involved in the evolution of the brine,according to previous noble gas studies.It is confirmed that the brine in Lop Nur has become enriched with potassium prior to halite precipitation over the full course of the salt lake's evolution.Based on chemical compositions of brine from drillhole LDK01 and previous lithological studies,the evolution of the salt lake can be divided into three stages and it is inferred that the brine in Lop Nur may have undergone at least two significant concentration-dilution periods.
基金Supported by the National Natural Science Foundation of China(Nos.42071313,41571363)the Science and Technology Project for Black Soil Granary(No.XDA28080500)the Scientific Investigation of Natural and Cultural Heritage of Lop Nur Region(No.2014FY210500)。
文摘The change in the ecological environment in the arid core area is a critical issue in the context of global warming.To study the paleoclimate evolution,precise identification of minerals deposited in Asia’s arid hinterland,Lop Nur Salt Lake,NW China was conducted.The hyperspectral data of the salt crust was sampled to identify the species and content of sedimentary minerals,and the multispectral photos were used to reconstruct the salt crust morphology using the unmanned aerial vehicles platform.The SUnSAL(sparse unmixing by variable splitting and augmented Lagrangian)method was employed to inverse the sedimentary mineral components along the shoreline.The heterogeneity of salt and clay minerals in bright and dark ear-shaped strips was evaluated.The paleoclimatic environment associated with salt lake extinction was reconstructed by analyzing paleoclimate records of sediments,spectral reflectance and morphology of the salt crust.Results show that:(1)the variations in the micro-geomorphology of the salt crust are obviously the reason for the formation of bright and dark ear-shaped strips and the differences in the species and relative content of the sedimentary minerals are the microscopic reason.The high ratio of sedimentary salt minerals to clay minerals(RS/C)contributes to the high reflectivity,and the salt crust presents a bright texture.The low RS/C results in the low reflectivity,salt crust presents a dark texture;(2)the bright and dark ear-shaped strips represent warm-arid and cold-humid climates.The shape of the Lop Nur Lake shoreline evolved due to alternating warm-dry and cold-humid paleoclimate changes.
基金supported by project from Department of Silviculture and Agroforestry,Dr.Y.S.Parmar University of Horticulture and Forestry,Solan,173 230,India
文摘Bamboos are used extensively for a variety of purposes,and many new species have been introduced to the northwestern Himalaya.However,their potential as a fodder species has not been investigated.Six bamboo species,namely Dendrocalamus hamiltonii Gamble,Dendrocalamus asper(Schult.and Schult.f.)Backer ex K.Heyne,Melocanna baccifera(Roxb.)Kurz,Phyllostachys aurea Rivie′re and C.Rivie′re,Phyllostachys bambusoides Sieb and Zucc.and Phyllostachys pubescens(Pradelle)Mazel ex J.Houz.were evaluated for their nutritional value,relative palatability and best lopping time.Dry matter(DM),ether extract(EE),and crude fibre varied from(37.0-67.7)%,(4.7-7.6),and(22.1-37.9)%,respectively.Values of crude protein ranged from(12.2-17.1)%,total ash(TA)from(11.8-21.5)%,acid insoluble ash(AIA)from(0.3-0.5)%,nitrogen free extract from(31.1-40.8)%,carbohydrates from(57.0-69.0)%,organic matter(OM)from(78.5-88.2)%,calcium from(1.7-2.3)%,phosphorus from(0.4-0.8)%,potassium from,(0.9-1.6)%,magnesium from(0.5-0.9)%,sodium from(603.7-1072.7)×10^-6 and vitamin A from(21.1-30.5)×10^-2 mg/g,respectively.D.hamiltonii had maximum values for DM,EE,TA and AIA.OM and vitamin A were highest in M.baccifera.CF and carbohydrates were maximized in P.aurea and CP in P.pubescens.All the values obtained for different bamboo species were less than maximum tolerable concentration of common feed resources of the region thereby indicating their suitability for nutrition and palatability.The contents of anti-nutritional factors,namely hydrocyanic acid and tannin ranged from(33.8-61.7)×10^-2 mg/g and(0.7-1.9)%,respectively.P.pubescens was the best species from a palatability point of view and has maximum crude protein content(17.2%),Ca(2.3%)and lowest tannin content(0.7%).The relative palatability of introduced bamboo species followed trend:P.pubescens(97.6%)[D.hamiltonii(92.5%)[P.bambusoides(81.2%)[D.asper(76.9%)[M.baccifera(75.9%)[P.aurea(73.4%).The optimum months for lopping these species for green leaves are November and December,as the nutritional value declines sharply thereafter.
基金Supported by National Natural Science Foundation of China(31300449)Science and Technology Support Program of Xinjiang Uyghur Autonomous Region(201433101)+1 种基金Doctoral Fund in the West of China of the Chinese Academy of Sciences(XBBS201205)Major Science and Technology Program of Xinjiang Uyghur Autonomous Region(201130106-3)
文摘Lop Nur potash mine greening projects is located in the heart of the Lop Nur, known as the ＂green zone ban＂. The project overcomes the extreme drought, high temperature, gale and dust salt and salt, and many other adverse environmen- tal factors. Adopted the suitable salt improvement measures and management tech- nology, the artificial green has emerged in the sea of death. At the same time the greening project improved the office environment of mining area, and shaped ex- treme environment greening projects successful cases.
文摘在建设和管理网络教学资源的过程中,面临着遇到灾害使教学资源损坏,造成巨大损失的问题。所以建立完善有效的容灾系统,是保障教学资源信息安全的必不可少的一项重要措施。本文提出了一种基于SQL Server Log Shipping的容灾系统,能够对本地服务器的数据进行异地存储和恢复,保证了系统在发生灾难时能够继续保持业务的连续性。
