According to a study published in Current Biology on May 22,the genetic components of the ancient populations in the western Qingzang Plateau are closest to that of the ancient populations in the southern Qingzang Pla...According to a study published in Current Biology on May 22,the genetic components of the ancient populations in the western Qingzang Plateau are closest to that of the ancient populations in the southern Qingzang Plateau,and have been maintained over the past 3,500 years.In addition,these ancient populations in the western Qingzang Plateau had complex and frequent interactions with ancient populations inside and outside the plateau.展开更多
The uplift of Qing—Zang (Qinghai—Tibet) plateau was the most important event in the late Cenozoic, which deeply influenced the environments of the World, especially those of China. Since the uplift is so important a...The uplift of Qing—Zang (Qinghai—Tibet) plateau was the most important event in the late Cenozoic, which deeply influenced the environments of the World, especially those of China. Since the uplift is so important and complex that it has been become the research focus of earth science. Nevertheless, the initial time and evolution process of the uplift is still controversial.1\ The initial time of the uplift\;Qing\|Zang plateau is a union geological\|geomorphic unit, which is composed of several geological\|structural units. Each geological\|structural unit has itself exchange history of sea\|continent (basin\|mountain); the exchange time of the different parts differs. Therefore, the initial time of some part of the plateau is not the uplift time of the whole plateau. The plateau is the highland with high height above sea level, little relief of the top, large area and steep boundary. The plateau plane is the paleo\|peneplain, which was formed by the uplift of the plateau after the peneplanation. Therefore, the initial time of the uplift should be counted from the time that the peneplain had been formed.展开更多
The inland lakes on the Tibetan Plateau are inhabited by diverse microbial communities,which play a significant role in biogeochemical cycles of biogenic elements(e.g.carbon,nitrogen).Onshore inputs provide essential
通过高分卫星遥感影像计算植被供水指数来反演亚高寒草甸土壤水分含量,结合高分辨率遥感影像(GF-2)和中分辨率的遥感影像(Landsat-7)进行土壤水分反演模型建模验证,揭示高分遥感影像结合植被供水指数法在青藏高原东北缘亚高寒草甸草原...通过高分卫星遥感影像计算植被供水指数来反演亚高寒草甸土壤水分含量,结合高分辨率遥感影像(GF-2)和中分辨率的遥感影像(Landsat-7)进行土壤水分反演模型建模验证,揭示高分遥感影像结合植被供水指数法在青藏高原东北缘亚高寒草甸草原上的适用性,同时分析研究区土壤水分分布及其影响因素。基于高分二号(GF-2)、Landsat-7影像数据,以甘南藏族自治州当周草原为研究区,利用植被供水指数(VSWI,vegetation supply water index)构建土壤水分反演模型得到研究区土壤水分含量反演图,通过半方差函数及主成分分析法探索研究区土壤水分空间分布及影响因素。结果表明:研究区土壤水分含量分布状态呈现出一定程度的空间变异,体现在整个研究区内以及各个地块之间,土壤水分含量主要介于0.11%~60.44%之间;土壤水分含量与坡度、海拔、坡向、NDVI、地表温度均呈正相关关系,分布主要受NDVI、坡向、坡度、海拔的影响。综上,利用植被供水指数法结合高分遥感影像监测土壤水分含量是可行的,基于GF-2遥感影像所建立的模型拟合度最优,较Landsat-7遥感影像更具优势。展开更多
文摘According to a study published in Current Biology on May 22,the genetic components of the ancient populations in the western Qingzang Plateau are closest to that of the ancient populations in the southern Qingzang Plateau,and have been maintained over the past 3,500 years.In addition,these ancient populations in the western Qingzang Plateau had complex and frequent interactions with ancient populations inside and outside the plateau.
文摘The uplift of Qing—Zang (Qinghai—Tibet) plateau was the most important event in the late Cenozoic, which deeply influenced the environments of the World, especially those of China. Since the uplift is so important and complex that it has been become the research focus of earth science. Nevertheless, the initial time and evolution process of the uplift is still controversial.1\ The initial time of the uplift\;Qing\|Zang plateau is a union geological\|geomorphic unit, which is composed of several geological\|structural units. Each geological\|structural unit has itself exchange history of sea\|continent (basin\|mountain); the exchange time of the different parts differs. Therefore, the initial time of some part of the plateau is not the uplift time of the whole plateau. The plateau is the highland with high height above sea level, little relief of the top, large area and steep boundary. The plateau plane is the paleo\|peneplain, which was formed by the uplift of the plateau after the peneplanation. Therefore, the initial time of the uplift should be counted from the time that the peneplain had been formed.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41030211 and 41002123)the Scientific Research Funds for the 1000 "Talents" Program Plan from China University of Geosciences (Beijing)+1 种基金State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (No. GBL11201)the Fundamental Research Funds for National University, China University of Geosciences (Wuhan)
文摘The inland lakes on the Tibetan Plateau are inhabited by diverse microbial communities,which play a significant role in biogeochemical cycles of biogenic elements(e.g.carbon,nitrogen).Onshore inputs provide essential
文摘通过高分卫星遥感影像计算植被供水指数来反演亚高寒草甸土壤水分含量,结合高分辨率遥感影像(GF-2)和中分辨率的遥感影像(Landsat-7)进行土壤水分反演模型建模验证,揭示高分遥感影像结合植被供水指数法在青藏高原东北缘亚高寒草甸草原上的适用性,同时分析研究区土壤水分分布及其影响因素。基于高分二号(GF-2)、Landsat-7影像数据,以甘南藏族自治州当周草原为研究区,利用植被供水指数(VSWI,vegetation supply water index)构建土壤水分反演模型得到研究区土壤水分含量反演图,通过半方差函数及主成分分析法探索研究区土壤水分空间分布及影响因素。结果表明:研究区土壤水分含量分布状态呈现出一定程度的空间变异,体现在整个研究区内以及各个地块之间,土壤水分含量主要介于0.11%~60.44%之间;土壤水分含量与坡度、海拔、坡向、NDVI、地表温度均呈正相关关系,分布主要受NDVI、坡向、坡度、海拔的影响。综上,利用植被供水指数法结合高分遥感影像监测土壤水分含量是可行的,基于GF-2遥感影像所建立的模型拟合度最优,较Landsat-7遥感影像更具优势。
