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| 1 | Seasonal dynamics of suprapermafrost groundwater and its response to the freeing-thawing processes of soil in the permafrost region of Qinghai-Tibet Plateau显示文摘The suprapermafrost groundwater in permafrost region not only is an important component of the water cycle and land surface process, but also is closely associated with the charges of ecological environment in cold region. However, the seasonal dynamics, driving factors, and mechanism of suprapermafrost groundwater are not well understood. Based on observation at slope scale on suprapermafrost groundwater dynamics of typical alpine meadows in the Qinghai-Tibet Plateau, the seasonal dynamics, spatial distribution and driving factors of suprapermafrost groundwater were analyzed. The results showed that there were close relationships between the seasonal dynamics of suprapermafrost groundwater and the freezing-thawing processes of active soil in permafrost region. The seasonal dynamics of suprapermafrost groundwater and its slope distribution pattern were controlled by soil temperature of active layers. The phase and range of the suprapermafrost groundwater dynamics are determined by deep soil(below 60 cm depth) moisture and groundwater recharging sources. The relationship between active soil temperatures and dynamics of suprapermafrost groundwater levels was better described by Boltzmann functions. However, the influencing thresholds of soil temperature on groundwater dynamics varied at different depths of active layers and in different slope positions, which resulted in the significant spatial heterogeneity of suprapermafrost groundwater dynamics in slope scale. Land cover change and global warming certainly altered the dynamics of suprapermafrost groundwater and the hydraulic interaction between groundwater and rivers, and consequently altered the overall hydrologic cycle of watershed scale. | CHANG Juan WANG GenXu LI ChunJie MAO TianXu | 2015 | Science China Earth Sciences2015，58，5： | 12 |
| 2 | Linkage between permafrost distribution and river runoff changes across the Arctic and the Tibetan Plateau显示文摘River runoff in the Arctic and the Tibetan Plateau(TP) change significantly in recent decades. However, the mechanisms of the physical processes of permafrost river runoff change remain uncertain across large scale. This study investigated the mainstreams and tributaries of main Arctic and TP rivers dominated by permafrost and assessed the linkage between hydrological regime change and permafrost. The results show that the effects of permafrost on river runoff are highly dependent on the permafrost coverage of a watershed. For the past decades, the majority of the Arctic and TP basins showed increased discharge, while all of the studied basins showed increased baseflow, with faster increasing speed than total discharge.Both total discharge and baseflow annual change rate(ΔQ and ΔBF) increased with permafrost coverage, indicating the increments of streamflow are enhanced with high permafrost coverage. Meanwhile, the annual change of precipitation showed weak connection with total discharge and baseflow change. The high permafrost coverage basins showed high annual maximum/minimum discharge ratio(Qmax/Qmin), while the Qmax/Qminchanged slightly in low permafrost cover basins. Our results highlight the importance of permafrost coverage on streamflow regime change for permafrost basins across the northern hemisphere. Due to these linkage between permafrost extent and runoff regime change and the increasing changes of permafrost, more attention should be paid to the change of hydrological processes in permafrost-underlain basins. | Chunlin SONG Genxu WANG Tianxu MAO Junchen DAI Daqing YANG | 2020 | Science China Earth Sciences2020，63，2： | 10 |
| 3 | Matching SAR imge to optical image using modified hausdorff distance ,and genetic algorithms 显示文摘 | Haicen Mao Qiuze YU Tianxu Zhang | 2007 | SPIE Pattern Recognition and Computer Vision2007，6788，20： | 1 |
| 4 | Impacts of sur- face soil organic content on the soil thermal dynamics of alpine meadows in permafrost regions: data from field observation 显示文摘 | Wang Genxu Mao Tianxu Chang Juan | 2014 | Geoderma2014，232，： | 1 |
| 5 | Tetrahedral framework nucleic acids promote scarless healing of cutaneous wounds via the AKT-signaling pathway显示文摘While the skin is considered the first line of defense in the human body,there are some vulnerabilities that render it susceptible to certain threats,which is an issue that is recognized by both patients and doctors.Cutaneous wound healing is a series of complex processes that involve many types of cells,such as fibroblasts and keratinocytes.This study showed that tetrahedral framework nucleic acids(tFNAs),a type of self-assembled nucleic-acid material,have the ability to promote keratinocyte(HaCaT cell line)and fibroblast(HSF cell line)proliferation and migration in vitro.In addition,tFNAs increased the secretion of vascular endothelial growth factor(VEGF)and basic fibroblast growth factor(bFGF)in HSF cells and reduced the production of tumor necrosis factor-alpha(TNF-α)and interleukin-1 beta(IL-1β)in HaCaT cells by activating the AKT-signaling pathway.During in vivo experiments,tFNA treatments accelerated the healing process in skin wounds and decreased the development of scars,compared with the control treatment that did not use tFNAs.This is the first study to demonstrate that nanophase materials with the biological features of nucleic acids accelerate the healing of cutaneous wounds and reduce scarring,which indicates the potential application of tFNAs in skin tissue regeneration. | Junyao Zhu Mei Zhang Yang Gao Xin Qin Tianxu Zhang Weitong Cui Chenchen Mao Dexuan Xiao Yunfeng Lin | 2020 | Signal Transduction and Targeted Therapy2020，5，1： | 1 |
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