Article
Environmental Sciences
C. M. Stephens, L. A. Marshall, F. M. Johnson, H. Ajami, L. Lin, L. E. Band
Summary: Future shifts in rainfall, temperature and carbon dioxide will have varying impacts on hydrologic and ecosystem behavior, with spatial heterogeneity and important differences in riparian zones. Models need to consider spatial heterogeneity, key ecosystem-driving dynamics and lateral transport to accurately predict ecohydrologic changes in catchments.
WATER RESOURCES RESEARCH
(2022)
Article
Plant Sciences
Rong Ma, Chunlin Xia, Yiwen Liu, Yanji Wang, Jiaqi Zhang, Xiangjin Shen, Xianguo Lu, Ming Jiang
Summary: This study investigated the spatiotemporal changes in grassland NPP and its response to climate change in temperate grasslands of China using MODIS data and climate data. The results showed that the annual NPP of China's temperate grasslands increased significantly from 2000 to 2020. Increased precipitation had a positive relationship with NPP, while increased temperature, particularly the summer maximum temperature, could decrease NPP. The study also found an asymmetric relationship between summer nighttime and daytime warming and the NPP of temperate meadow.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Environmental Sciences
Xiangjin Shen, Yiwen Liu, Liyuan Wu, Rong Ma, Yanji Wang, Jiaqi Zhang, Lei Wang, Binhui Liu, Xianguo Lu, Ming Jiang
Summary: This study shows that global grassland greening has significant effects on surface temperatures, with cooling effects in areas south of 50 degrees N and warming effects in areas north of 50 degrees N.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Remote Sensing
Rong Ma, Xiangjin Shen, Jiaqi Zhang, Chunlin Xia, Yiwen Liu, Liyuan Wu, Yanji Wang, Ming Jiang, Xianguo Lu
Summary: This study analyzed the variations in end date of vegetation growing season (EOS) in temperate grasslands of China and their relationships with climate variations. The results showed that EOS was delayed by 1.62 days/decade. Increasing summer precipitation and autumn temperatures were crucial for delaying EOS. The study also found asymmetric influences of nighttime and daytime warming on EOS.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2022)
Article
Environmental Sciences
Meixian Liu, Jieyin Huang, Alexander Y. Sun, Kelin Wang, Hongsong Chen
Summary: The study found that drought-stressed vegetation tended to alleviate agricultural droughts, and this ability was influenced by vegetation types and climate changes. Although vegetation can help alleviate agricultural droughts, changes in agricultural droughts are still primarily driven by climate changes, especially precipitation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Plant Sciences
Zhaogang Liu, Zhi Chen, Guirui Yu, Weikang Zhang, Tianyou Zhang, Lang Han
Summary: Drylands play a significant role in the land carbon sink, but the implications of climate change on carbon dynamics in these areas are not well understood. This study investigates the roles of climate, vegetation, and soil factors on carbon fluxes, and finds that soil factors have a greater impact on carbon fluxes in drylands.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Environmental Sciences
Shengli Liu, Tong Li, Bing Liu, Chenyang Xu, Yan Zhu, Liujun Xiao
Summary: This study focused on grassland activity in Inner Mongolia, China, and investigated the risk of vegetation decline under drought conditions. The results showed a positive correlation between water balance and vegetation activity, with soil properties playing a significant role in mitigating the adverse effects of drought on grassland vegetation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Meixian Liu, Alexander Y. Sun, Kairong Lin, Wei Luo, Xinjun Tu, Xiaohong Chen
Summary: The non-water-limited canopy resistance (rcs) is increasing globally, with air temperature and CO2 concentration playing significant roles. Traditional potential evapotranspiration (PET) estimators tend to overestimate (underestimate) the increasing (decreasing) trends in regions with increasing (decreasing) PET.
WATER RESOURCES RESEARCH
(2023)
Article
Ecology
Guangshuai Li, Lingxue Yu, Tingxiang Liu, Yulong Bao, Jiaxin Yu, Bingxia Xin, Lun Bao, Xuan Li, Xinyue Chang, Shuwen Zhang
Summary: Based on MODIS NDVI data and growth season meteorological data, this study investigated the spatial and temporal variation characteristics of grassland vegetation on the Mongolian Plateau, as well as the dual response of NDVI changes to climate and human activities. The results showed that the average NDVI of grassland vegetation increased gradually from southwest to northeast during the growing season, with a significant overall increase from 2000 to 2018. Precipitation, average air temperature, and downward surface shortwave radiation all played a role in influencing the NDVI variations, with Inner Mongolia experiencing higher precipitation rates and lower air temperature and surface shortwave radiation rates compared to Mongolia. The study emphasized the importance of ecological engineering and agricultural production activities for vegetation recovery in the region. The findings contribute to our understanding of surface-atmosphere interactions in arid and semi-arid regions in the context of global climate change.
FRONTIERS IN ECOLOGY AND EVOLUTION
(2023)
Article
Environmental Sciences
Ran Zhai, Fulu Tao
Summary: The study shows that climate change, especially precipitation change, was the dominant factor influencing runoff and TEWR changes. Between 1982 and 2015, climate change increased runoff in certain regions in China and improved TEWR in other regions. Leaf area index (LAI) also played a significant role in decreasing runoff and increasing TEWR, especially in the Yellow River basin, Huai River basin, and Hai River basin. Land use/cover change had a smaller impact compared to climate and LAI changes, but still had importance in specific local areas.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Environmental Sciences
Wenxu Cao, Hang Xu, Zhiqiang Zhang
Summary: Global climate change has a profound impact on vegetation growth patterns. However, regional climate characteristics tend to weaken the disparities in vegetation responses observed in large-scale studies. Additionally, different vegetation types exhibit distinct reactions to climate variability, making it challenging to detect and attribute changes in vegetation growth. This study used the normalized difference vegetation index (NDVI) dataset to investigate the spatiotemporal distribution and dynamic characteristics of climate change effects on vegetation growth from 2000 to 2020. The findings revealed a continuous greening trend, with precipitation identified as the dominant climatic factor influencing this trend. Continued warming, however, has led to a slowdown in vegetation growth. Solar radiation was also found to correspond to the vegetation trend. These findings highlight the nonlinearity of long-term vegetation growth trends with climate variation and provide valuable insights into forecasting vegetation responses to future climate change.
Article
Engineering, Environmental
Shuqi Yu, Huapeng Qin
Summary: In this study, an eco-hydrological model was proposed to evaluate the effects of plant nitrogen uptake on the nitrogen removal performance of bioretention systems. The results showed that plant nitrogen uptake significantly affects the system's performance, especially during rainy seasons.
Article
Environmental Sciences
Athanasios Paschalis, Sara Bonetti, Yanran Guo, Simone Fatichi
Summary: This study quantifies the impact of uncertainties in using different pedotransfer functions on ecosystem dynamics. The results show that these uncertainties can affect both hydrological and vegetation dynamics, especially in water-limited ecosystems. The uncertainties in evapotranspiration, plant productivity, and vegetation structure are around 10% at annual time scales, while uncertainties in runoff and groundwater recharge are one order of magnitude larger.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Zheng Chen, Jieyu Liu, Zhonghua Qian, Li Li, Zhiseng Zhang, Guolin Feng, Shigui Ruan, Guiquan Sun
Summary: This study analyzed the vegetation dynamics under the effects of climate change in arid ecosystems using a mathematical model. They found that the ecosystem might experience a catastrophic shift with the climatic deterioration and that recent climate changes were the main reason for land degradation. The results suggest that vegetation patterns can provide clues to whether the ecosystem is approaching desertification, which can help map vulnerable arid areas globally through model simulation and satellite images.
Article
Environmental Sciences
Yue Liu, Huanhuan Liu, Yin Chen, Chengcheng Gang, Yifan Shen
Summary: Distinguishing the contributions of climate change and human activities to vegetation dynamics is crucial for sustainable environmental management. This study used the residual trend method to quantify the relative contributions of human activities and climate change to vegetation trends in China from 1988 to 2018. The results showed that human activities played a major role in the increase of NDVI and GPP, while the dynamics of VOD were influenced by a balance of human activities and climate change. The relative roles of climate and human factors varied across different regions.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Mengshen Guo, Weifeng Yue, Tiejun Wang, Nengzhan Zheng, Lijun Wu
Summary: Groundwater drought is a drought phenomenon caused by natural and anthropogenic disturbances. This study used the standardized groundwater level index (SGI) to quantify groundwater drought, finding that groundwater drought varied significantly in different areas and was influenced by factors such as geographical location, agricultural irrigation, and human activities. The trend of change in groundwater level differed among monitoring wells, with some showing initial decrease followed by increase, while others showed continuous decline.
JOURNAL OF HYDROLOGY
(2021)
Article
Soil Science
Ling Li, Dongdong Wu, Tiejun Wang, Yunqiang Wang
Summary: This study used soil moisture data from the Watershed Allied Telemetry Experimental Research Network (Waternet) in a mountainous region of northwest China to evaluate the impacts of environmental factors on regional soil moisture spatiotemporal patterns. The results showed that local factors, such as elevation, had a stronger correlation with soil moisture spatial distributions than regional factors, such as precipitation. The study also found that the primary component in the total soil moisture spatial variability was the time-invariant component, and the temporal evolutions of the time-variant components were influenced by local factors, particularly elevation.
Article
Engineering, Civil
Qin Liu, Tiejun Wang, Cong-qiang Liu, Espoire M. R. B. Mikouendanandi, Xi Chen, Tao Peng, Lin Zhang
Summary: Knowledge of the spatiotemporal dynamics of soil water content (SWC) and soil water stable isotopic compositions (SWSIC) is critical for understanding water exchanges across the atmosphere-land interface. Compared with SWC, studies on the spatiotemporal characteristics of SWSIC are still scarce, and their spatiotemporal patterns are different from those of SWC. Soil evaporation has less influence on the spatial variations of 6D values of soil water.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Lichun Wang, M. Bayani Cardenas, Tiejun Wang, Jia-Qing Zhou, Lizhi Zheng, Yi-Feng Chen, Xi Chen
Summary: The onset of Forchheimer flow in porous media is determined by the critical hydraulic gradient which scales with permeability, but the relationship may change at low permeability due to other flow processes. Further investigations are needed to understand the uncertainties in the power law relationship.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Lichun Wang, Lizhi Zheng, Kuldeep Singh, Tiejun Wang, Jing Liu-Zeng, Sheng Xu, Xi Chen
Summary: The formation of pores in the subsurface during Earth's processes is crucial for storing natural resources and transporting fluids. A theoretical framework has been developed to quantify the effective pore volume of heterogeneous porous matrices and fracture flow systems, showing robustness in estimating the effective pore volume.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Meng Xu, Qin Liu, Dongdong Wu, Tiejun Wang, Mikouendanandi Espoire, Qi Chai
Summary: This study investigates the spatiotemporal variations of soil water content and soil water stable isotopic compositions, and their controlling factors. The results show significant spatiotemporal variabilities in the isotopic compositions at the field scale, with larger variations in wet seasons than in dry seasons. The spatial variations decrease with increasing soil depth. Time stability analysis reveals the persistence of spatial structure of isotopic compositions, particularly at deeper soil depths. Vegetation has noticeable effects on the isotopic dynamics, including shading effects, root distribution, and water uptake. The study also identifies representative sites for monitoring spatial average isotopic values, demonstrating the feasibility of using time stability analysis to estimate spatial average values at field scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shanshan Jiang, Xi Chen, Richao Huang, Tiejun Wang, Keith Smettem
Summary: This study analyzed the altitudinal changes of plant phenology in response to climate change in subtropical mountain areas in southwest China. The results showed that climate warming has prolonged the growing season length in the deciduous broadleaf forest, but the increase differs with altitude.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Shelby Ahrendt, Alexander R. Horner-Devine, Brian D. Collins, Jacob A. Morgan, Erkan Istanbulluoglu
Summary: Changes in the severity and likelihood of flooding events are not only associated with changes in the intensity and frequency of streamflows, but also with adjustments in a river's conveyance capacity. The study reveals that in unregulated rivers, moderate floods have increased across the region, while in regulated rivers, this trend is suppressed or even reversed. Variations in channel conveyance are widespread, but the magnitude and timing of adjustments are not consistent. The relative importance of conveyance variability for flood risk depends on the mode of adjustment.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Jeffrey Keck, Erkan Istanbulluoglu, Jessica Lundquist, Christina Bandaragoda, Kristin Jaeger, Guillaume Mauger, Alex Horner-Devine
Summary: In this study, the authors found that using daily precipitation data to drive sediment transport models can lead to significant underestimation of bedload transport capacity. The error introduced can range from 10% to over two orders of magnitude, depending on the location in the channel network. These findings have implications for flood-hazard and aquatic habitat models that rely on coarse-temporal-resolution climate data.
WATER RESOURCES RESEARCH
(2022)
Article
Environmental Sciences
Yuan Zou, Wei Chen, Siliang Li, Tiejun Wang, Le Yu, Min Xu, Ramesh P. Singh, Cong-Qiang Liu
Summary: This study conducted a detailed analysis of spatio-temporal vegetation patterns in the Beijing-Tianjin-Hebei region. The results show a slow upward trend in vegetation indices and leaf area indices, with variations observed among different vegetation types and regions. The study also reveals significant correlations between air temperature, precipitation, and net primary production, as well as negative impacts of urbanization on vegetation.
Article
Environmental Sciences
Lang Han, Gui-Rui Yu, Zhi Chen, Xian-Jin Zhu, Wei-Kang Zhang, Tie-Jun Wang, Li Xu, Shi-Ping Chen, Shao-Min Liu, Hui-Min Wang, Jun-Hua Yan, Jun-Lei Tan, Fa-Wei Zhang, Feng-Hua Zhao, Ying-Nian Li, Yi-Ping Zhang, Li-Qing Sha, Qing-Hai Song, Pei-Li Shi, Jiao-Jun Zhu, Jia-Bing Wu, Zhong-Hui Zhao, Yan-Bin Hao, Xi-Bin Ji, Liang Zhao, Yu-Cui Zhang, Shi-Cheng Jiang, Feng-Xue Gu, Zhi-Xiang Wu, Yang-Jian Zhang, Zhou Li, Ya-Kun Tang, Bing-Rui Jia, Gang Dong, Yan-Hong Gao, Zheng-De Jiang, Dan Sun, Jian-Lin Wang, Qi-Hua He, Xin-Hu Li, Fei Wang, Wen-Xue Wei, Zheng-Miao Deng, Xiang-Xiang Hao, Xiao-Li Liu, Xi-Feng Zhang, Xing-Guo Mo, Yong-Tao He, Xin-Wei Liu, Hu Du, Zhi-Lin Zhu
Summary: Accurately estimating ecosystem respiration is crucial for understanding terrestrial carbon cycles and predicting global carbon budgets. In this study, an Intelligent Random Forest (IRF) model was developed to estimate ecosystem respiration in China, integrating ecological understanding with machine learning techniques. The results showed that the IRF model outperformed other models and algorithms. The study highlighted the importance of gross primary productivity, living plant biomass, and soil organic carbon in controlling the spatiotemporal variability of ecosystem respiration in China.
GLOBAL BIOGEOCHEMICAL CYCLES
(2022)
Article
Engineering, Civil
Qiong Han, Tiejun Wang, Yibin Dai, Zhe Kong
Summary: This study analyzed the temporal variations in surface evaporative fraction (EF) and its responses to environmental conditions in a coastal wetland. The findings showed that the EF patterns in the wetland were significantly different from terrestrial ecosystems, mainly due to the complex interactions of local atmospheric, soil, and vegetation conditions. The EF variability in coastal wetlands was found to be more tightly constrained by atmospheric conditions and vegetation dynamics, providing new insights into energy exchanges in these ecosystems.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
Ruiyuan Hu, Yimin Wang, Jianxia Chang, Erkan Istanbulluoglu, Aijun Guo, Xuejiao Meng, Zhehao Li, Bing He, Yuexin Zhao
Summary: Vegetation degradation is the main cause of land desertification in arid areas, and understanding the water demand mechanisms can be achieved by studying water cycle processes. This study creatively constructed a vegetation water demand route model to investigate the water demand mechanisms of natural vegetation and farmland in an arid inland basin. The results showed that natural vegetation primarily relied on root-zone soil moisture, groundwater, and precipitation as water sources, while farmland mainly depended on surface soil moisture.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geography, Physical
Si-Liang Li, Xin Liu, Fu-Jun Yue, Zhifeng Yan, Tiejun Wang, Songjing Li, Cong-Qiang Liu
Summary: Nitrogen dynamics in ecosystems have significant impacts on the Earth's surface system. Exploring the sources and transformation of nitrogen in different Critical Zones is crucial for understanding biogeochemical cycles and promoting sustainable development.
PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT
(2022)
Article
Environmental Sciences
Sai S. Nudurupati, Erkan Istanbulluoglu, Gregory E. Tucker, Nicole M. Gasparini, Daniel E. J. Hobley, Eric W. H. Hutton, Katherine R. Barnhart, Jordan M. Adams
Summary: Projecting the response of arid and semi-arid ecosystems to global change involves integrating various analytical and numerical models. This study used the Landlab earth surface modeling toolkit to investigate the controls of exogenous drivers and endogenous grass-fire feedback mechanisms in New Mexico. The simulations showed that shrubs occupy cooler slopes in dry conditions and shift to warmer slopes as regional moisture increases. The expansion of woody plant encroachment is predicted to occur in three phases, with the second phase requiring the removal of positive grass-fire feedback by grazing or fire suppression.
WATER RESOURCES RESEARCH
(2023)
