A5101785558- Climate change and permafrost
- Cryospheric studies and observations
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Remote Sensing and Land Use
- Peatlands and Wetlands Ecology
- Plant Water Relations and Carbon Dynamics
- Soil and Unsaturated Flow
- Land Use and Ecosystem Services
- Plant Ecology and Soil Science
- Remote Sensing in Agriculture
- Marine and coastal ecosystems
- Soil erosion and sediment transport
- Rangeland Management and Livestock Ecology
- Environmental Changes in China
- Geological Studies and Exploration
- Soil Carbon and Nitrogen Dynamics
- Remote-Sensing Image Classification
- Climate variability and models
- Agriculture Sustainability and Environmental Impact
- Olfactory and Sensory Function Studies
- Plant and animal studies
- Advanced SAR Imaging Techniques
- Insect Utilization and Effects
- Solar Radiation and Photovoltaics
The University of Tokyo
2024
Nanjing University of Information Science and Technology
2024
Chinese Academy of Sciences
2011-2022
Northwest Institute of Eco-Environment and Resources
2018-2022
George Washington University
2014-2017
Guizhou Academy of Agricultural Sciences
2017
Guizhou Electric Power Design and Research Institute
2017
Kunming Institute of Botany
2016
University of Technology Sydney
2014
University of Virginia
2007-2012
Permafrost plays a critical role in soil hydrology. Thus, the degradation of permafrost under warming climate conditions may affect alpine grassland ecosystem on Qinghai–Tibetan Plateau. Previous space-for-time studies using plot and basin scales have reached contradictory conclusions. In this study, we applied process-based model (DOS-TEM) with state-of-the-art hydrology scheme to examine issue. Our results showed that 1) DOS-TEM could properly simulate responses thermal hydrological...
The causes of a greening trend detected in the Arctic using normalized difference vegetation index (NDVI) are still poorly understood. Changes NDVI result multiple ecological and social factors that affect tundra net primary productivity. Here we use 25 year time series AVHRR-derived data (AVHRR: advanced very high resolution radiometer), climate analysis, global geographic information database ground-based studies to examine spatial temporal patterns greenness on Yamal Peninsula, Russia. We...
Permafrost on the Qinghai–Tibetan Plateau (QTP) has degraded over last few decades. Its ecological effects have attracted great concern. Previous studies focused mostly at plot scale, and hypothesized that degradation of permafrost would cause lowering water table drying shallow soil then alpine grassland. However, none been done to test hypothesis basin scale. In this study, for first time, we investigated relationships between land surface temperature (LST) fractional vegetation cover...
Northwestern Siberia has been undergoing a range of land cover and use changes associated with climate change, animal husbandry development mineral resources, particularly oil gas. The caused by oil/gas Southeast the city Nadym were investigated using multi-temporal multi-spatial remotely sensed images. Comparison between high spatial resolution imagery acquired in 1968 2006 indicates that 8.9% study area experienced an increase vegetation (e.g. establishment new saplings, extent vegetated...
Abstract Diffuse radiation can increase canopy light use efficiency (LUE). This creates the need to differentiate effects of direct and diffuse when simulating terrestrial gross primary production (GPP). Here, we present a novel GPP model, diffuse‐fraction‐based two‐leaf model (DTEC), which includes leaf response radiation, treats maximum LUE for shaded leaves ( ɛ msh defined as power function fraction D f )) sunlit msu constant) separately. An Amazonian rainforest site (KM67) was used...
The arctic is a sensitive system undergoing dramatic changes related to recent warming trends. Vegetation dynamics - increases in the quantity of green vegetation and northward migration trees into tundra are component this change. Although field studies over long time periods can be logistically problematic, simulation modeling provides means for projecting subarctic caused by environmental variations.
Understanding the responses of arctic tundra biome to a changing climate requires knowledge complex interactions among climate, soils and biological system. This study investigates individual interaction effects change reindeer grazing across variety zones soil texture types on vegetation community dynamics using an model that incorporates diet, where is function both foliar nitrogen concentration forage preference. We found important, in addition latitudinal gradient, controlling plant...
Satellite remote sensing data have indicated a general 'greening' trend in the arctic tundra biome. However, observed changes based on are result of multiple environmental drivers, and effects individual controls such as warming, herbivory, other disturbances vegetation biomass, community structure, ecosystem function remain unclear. We apply ArcVeg, an dynamics model, to estimate potential biomass net primary production (NPP) at plant functional type levels. ArcVeg is driven by soil...
In order to map the spatial extent and location of slum settlements multiple methodologies have been devised including remote sensing based methods field using surveys census data. this study we utilize spatial, structural, contextual features (e.g., PanTex, Histogram Oriented Gradients, Line Support Regions, Hough transforms others) calculated at scales from high resolution satellite data areas compare these estimates three maps: one UN Habitat/Accra Metropolitan Assembly (UNAMA) two...
Abstract. Soils on the Qinghai–Tibetan Plateau (QTP) have distinct physical properties from agricultural soils due to weak weathering and strong erosion. These might affect permafrost dynamics. However, few studies investigated both quantitatively. In this study, we selected a site central region of QTP excavated soil samples down 200 cm. We measured porosity, thermal conductivity, saturated hydraulic matric potential in laboratory. Finally, ran simulation model replacing default sand or...
Sustainability of tundra vegetation under changing climate on the Yamal Peninsula, northwestern Siberia, home to world’s largest area reindeer husbandry, is crucial importance local native community. An integrated investigation needed for better understanding effects soils, change and grazing in region. In this study we applied a nutrient-based plant community model—ArcVeg—to evaluate how two factors (soil organic nitrogen (SON) levels grazing) interact affect responses warming across...
The Qinghai-Tibetan Plateau (QTP) contains the largest permafrost area in a high-altitude region world, and unique hydrothermal environments of active layers this have an important impact on vegetation growth. Geographical locations present different climatic conditions, combination with environments, these conditions comprehensively affect local activity. Therefore, responses to climate change QTP may be varied differently by geographical location condition. In study, using latest Global...
Abstract Responses of plant traits to climate changes are complex, which could be mirrored by the investigations herbarium specimens. By examining specimens Rosa and Cotoneaster species collected since 1920s in Hengduan Mountains, we analyzed flowering phenology flower size past century when were considered intensified. We found that showed no significant change, but was delayed recent years. Flower a marginally decrease over century. The results suggested responses time global pollinator...
This study extends the CGAN-based MODIS cloud vertical-profile (64×64-scene, about 70km width×15km height) retrieval technique developed by Leinonen et al. (2019) [1] to construct seamless 3D fields for granules [2]. Firstly, accuracy and spatial continuity of retrievals are statistically evaluated. Then, according characteristics error, a spatially overlapping-scene ensemble generation method bi-directional Ensemble Binning Probability Fusion (CGAN-BEBPF) developed, which improves CGAN...
Permafrost degradation affects soil properties and vegetation, but little is known about its consequent effects on the bacterial community. In this study, we analyzed community structure of 12 permafrost-affected samples from four principal permafrost types, sub-stable (SSP), transition (TP), unstable (UP) extremely (EUP), to investigate vegetation characteristics during process degradation. Proteobacteria, Acidobacteria, Actinobacteria Bacteroidetes were predominant phyla in all types. The...
Accurately estimating daily mean ecosystem respiration rate (Re) is important for understanding how carbon budgets will respond to climate change. Usually, Re represented by measurement using static chamber on alpine meadow ecosystems from 9:00 11:00 h a.m. local time directly. In the present study, however, we found that calculated was significantly higher than 0:00 23:30 in an site, which might be caused special condition Qinghai‐Tibetan Plateau. Our results indicated cannot used represent
People living within cities tend to live near others who have similar characteristics such as socioeconomic status, religion or ethnicity. Generally the of these spatial groups manifest themselves at neighborhood level and they in dwellings. In this study we examine ability use features spectral information, derived from high resolution satellite data, map variations dwellings determine amount information can derive about people city Accra, Ghana. The examined are line support regions,...