Article
Geosciences, Multidisciplinary
Jianan Hu, Zhuotong Nan, Hailong Ji
Summary: Permafrost degradation caused by climate warming can disturb alpine ecosystem stability and influence net primary productivity (NPP). In this study, the changes in NPP in the Three-River Headwaters Region (TRHR) on the Qinghai-Tibet plateau were simulated using the Noah-MP model. The results showed that NPP in TRHR increased slightly during 1989-2018 but decreased in recent years. Permafrost degradation has complex implications for ecosystem, with both increasing and decreasing changes in NPP observed.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Xiaoying Jin, Jianjun Tang, Dongliang Luo, Qingfeng Wang, Ruixia He, Raul-D. Serban, Yan Li, Mihaela Serban, Xinze Li, Hongwei Wang, Xiaoying Li, Wenhui Wang, Qingbai Wu, Huijun Jin
Summary: Engineering corridors on the Qinghai-Tibet Plateau have significantly modified the regional ecosystem and caused changes in the alpine ecosystem. This study investigated vegetation changes and their driving factors along the G214 highway in the southern Qinghai Plateau. The results showed that the NDVIgs increased slightly from 2010 to 2019, with annual precipitation being the dominant factor influencing the variations in NDVIgs.
Article
Environmental Sciences
Houfa Wu, Zhenxin Bao, Jie Wang, Guoqing Wang, Cuishan Liu, Yanqing Yang, Dan Zhang, Shuqi Liang, Chengfeng Zhang
Summary: This study analyzed the variation characteristics of runoff and the main influencing factors in the source regions of the Yangtze River and the Yellow River. The results showed that climate change had the greatest effect on runoff variation in the Yangtze River source region, while other environmental factors mainly controlled the runoff variation in the Yellow River source region. These findings are of great significance for improving water resources utilization efficiency.
Article
Environmental Sciences
Siru Chen, Wenhui Zhao, Renxiang Zhang, Xun Sun, Yangzhen Zhou, Leizhen Liu
Summary: This study explores the potential of using near-infrared radiance of vegetation (NIRv, Rad) to track hourly and daily changes in C3 and C4 plants and investigate the relationship between NPP and NIRv, Rad. Results show that NIRv, Rad can effectively respond to NPP changes in C3 and C4 plants on hourly and daily scales, making it a promising indicator of NPP.
Article
Environmental Sciences
Guangyue Liu, Lin Zhao, Changwei Xie, Defu Zou, Tonghua Wu, Erji Du, Lingxiao Wang, Yu Sheng, Yonghua Zhao, Yao Xiao, Chong Wang, Yiwei Wang
Summary: The distribution of permafrost is crucial for studying climate, ecology, hydrology, and infrastructure construction in high-cold mountain regions. This study proposes a new method using ground-penetrating radar to detect frozen ground and extract the boundaries of permafrost patches in mountain areas. The results are compared with field survey data and existing distribution maps, showing high consistency. The study reveals the influence of aspect on permafrost distribution in mountain areas.
Article
Remote Sensing
Qingwei Zhuang, Zhenfeng Shao, Deren Li, Xiao Huang, Orhan Altan, Shixin Wu, Yuzhen Li
Summary: This study analyzes the impact of urbanization on vegetation carbon sequestration capacity in oasis cities. The results show that urbanization leads to a decrease in vegetation area and carbon loss, but does not change the overall carbon sequestration trend, only slowing down its rate of increase. These findings are important for the sustainable development of oasis cities and regional carbon neutrality.
GEO-SPATIAL INFORMATION SCIENCE
(2023)
Article
Ecology
Vijaykumar Bejagam, Ashutosh Sharma
Summary: This study used remote sensing-based observations and statistical analysis to analyze the impact of climate change and anthropogenic activities on ecosystem net primary productivity (NPP) in India. The results showed that precipitation, temperature, and solar radiation were the main factors influencing NPP. Human-influenced ecosystems experienced an increasing trend in NPP, while natural ecosystems showed a decreasing trend. Overall, NPP in India increased during the study period.
ECOLOGICAL INFORMATICS
(2022)
Review
Geosciences, Multidisciplinary
Xiao Wu, Yao Yue, Alistair G. L. Borthwick, Louise J. Slater, Jaia Syvitski, Naishuang Bi, Zuosheng Yanga, Houjie Wang
Summary: Large reservoirs have significant impacts on the water-sediment dynamics and morphology of alluvial rivers. The anti-seasonal regulation mode of the Three Gorges Reservoir led to widespread downstream incision, while the swift drawdown process of the Xiaolangdi Reservoir effectively mitigated reservoir sedimentation and boosted sediment reaching the sea. Both reservoirs experienced vast sedimentation, causing erosion and coarsening downstream of the dams. The sediment deficits posed challenges to the sustainability of the Yangtze and Yellow river deltas.
EARTH-SCIENCE REVIEWS
(2023)
Article
Environmental Sciences
Hui Li, Hongyan Zhang, Qixin Li, Jianjun Zhao, Xiaoyi Guo, Hong Ying, Guorong Deng, Wu Rihan, Shuling Wang
Summary: This study analyzed the characteristics of vegetation productivity and the effects of climate and human factors in Northeast China. The results showed that climate change played a leading role in promoting the increase of ANPP in most areas, while human activities led to a decrease in ANPP in certain regions. The impact of climate change and human activities varied significantly under different topography and altitudes, with different percentages of ANPP increase attributed to each factor.
Article
Environmental Sciences
Lin Hu, Zhaosheng Wang, Mei Huang, Hongfu Sun, Qinyi Wang
Summary: O-3 pollution in China has been increasing, but its impact on net primary productivity (NPP) of terrestrial ecosystems is unclear. This study uses remote sensing and ground observation data to assess the impact of O-3 on China's NPP. The findings show a significant negative correlation between NPP and O-3 concentration in farmland and grassland ecosystems. The estimated percentage of O-3-induced NPP decline ranges from 5% to 35%, with the highest declines in farmland ecosystems.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Jia Ke, Dandan Zhou, Chunxing Hai, Yanhua Yu, Hao Jun, Bingzi Li
Summary: Coal mining has significant local environmental impact while contributing to regional economic development. This study used a CASA model to assess the vegetation net primary productivity (NPP) in the Ordos area of the Shendong coal fields. The results showed a fluctuating upward trend of NPP, positively correlated with precipitation and human activities, and negatively correlated with air temperature. Although vegetation NPP in the mining-affected region has improved, it remains lower than that in natural areas.
Article
Environmental Sciences
Zhaoqi Wang, Hong Wang, Tongfang Wang, Lina Wang, Xiaotao Huang, Kai Zheng, Xiang Liu
Summary: Global warming has had widespread impacts on the terrestrial ecosystem, particularly on vegetation's net primary productivity (NPP). However, the effect of climate variation on the spatial pattern of NPP has remained unclear. This study analyzed the spatiotemporal patterns and trends of MODIS NPP and environmental factors, revealing that NPP increases with elevation in approximately 60% of the global area. Soil moisture exhibits the largest uncertainty, while temperature has the smallest uncertainty among the environmental factors. The dominance of temperature in shaping the elevation distribution of NPP is highlighted.
Article
Geography, Physical
Ziyu Yan, Zhihai Gao, Bin Sun, Xiangyuan Ding, Ting Gao, Yifu Li
Summary: Grassland is a crucial land resource for human survival and development, but the extent of its global degradation remains uncertain. This study quantitatively explored global grassland degradation trends from 2000 to 2020 and analyzed the driving factors, especially in hotspots. The results showed significant improvement in global grassland since 2000, with Africa and Asia leading in degradation and improvement, respectively. Climate change and human activities were identified as the main driving factors, accounting for a large percentage of grassland degradation and improvement.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2023)
Article
Engineering, Environmental
Bowen Tai, Qingbai Wu, Zurun Yue, Hongbin Xu
Summary: The study analyzes the thermal-deformation characteristics of embankments using different filling materials in cold regions and proposes fundamental principles to prevent freeze-thaw damage. It highlights the importance of understanding the temporal and spatial development of seasonal thawing/freezing layers in preventing damage. By controlling cold entrance and diffusion in permafrost regions and adjusting filling material properties in seasonal frozen ground regions, the long-term stability of embankments can be maintained.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2021)
Article
Biodiversity Conservation
Nitu Wu, Aijun Liu, Ruhan Ye, Dongsheng Yu, Wala Du, Qiqige Chaolumeng, Guixiang Liu, Shan Yu
Summary: The study found that climate change is the main factor leading to grassland NPP change, while human activities affect the change of NPP in local areas. Grassland NPP showed a slightly decreasing trend from 1982 to 2018, with a significant change in 1998.
GLOBAL ECOLOGY AND CONSERVATION
(2021)