Jinxun Liu
Biography
My research interests and expertise are closely related to system ecology and ecosystem simulation models. During my PhD study, I used Professional Dynamo Plus to build an agro-forestry system model and performed system optimization on tree harvesting. From late 1990s, I began carbon simulation studies. I have used a number of models in my research, such as the CBM-CFS2, 3PG, TreeDYN, CENTURY, TRIPLEX, IBIS, GEMS-EDCM, and USPED. My current research also includes models like Biome-BGC, DAYCENT, ED, CLM and LUCAS. My other experiences/skills include GIS/RS data processing, back-propagation (BP) neural network modeling, NetCDF data processing/visualization, and leadership class supper computing (ALCF Mira/Theta). My Research activities have brought 50+ various peer-reviewed journal publications.
I have been participating in the development of the methodology and the implementation of GEMS and IBIS models for the USGS LandCarbon Project since 2010. Currently I am leading an ESTCP project that focuses on ecosystem model inter-comparisons and decision support. Beyond that, I also joined in a multi-organization effort on inland and coastal wetland modeling.
Science and Products
Land Use and Climate Change Team
We are a research team focusing on understanding the rates, causes, and consequences of land change across a range of geographic and temporal scales. Our emphasis is on developing alternative future projections and quantifying the impact on environmental systems, in particular, the role of land-use change on ecosystem carbon dynamics.
We are interested in how land-use and climate...
Effects of 21st century climate, land use, and disturbances on ecosystem carbon balance in California
Terrestrial ecosystems are an important sink for atmospheric carbon dioxide (CO2), sequestering ~30% of annual anthropogenic emissions and slowing the rise of atmospheric CO2. However, the future direction and magnitude of the land sink is highly uncertain. We examined how historical and projected changes in climate, land use, and ecosystem...
Sleeter, Benjamin M.; David Marvin; D. Richard Cameron; Selmants, Paul; LeRoy Westerling; Kreitler, Jason R.; Colin Daniel; Liu, Jinxun; Wilson, Tamara Grasslands
Key findings:Total grassland carbon stocks in the conterminous United States, estimated to be about 7.4 petagrams of carbon (Pg C) in 2005, are projected to increase to about 8.2 Pg C by 2050. Although U.S. grasslands are expected to remain carbon sinks over this period, the uptake rate is projected to decline by about half. In the U.S. Great...
Cavallaro, Nancy; Shrestha, Gyami; Birdsey, Richard; Mayes, Melanie A.; Najjar, Raymond G.; Reed, Sasha C.; Romero-Lankao, Patricia; Zhu, Zhiliang; Pendall, Elise; Bachelet, Dominique; Conant, Richard T.; El Masri, Bassil; Flanagan, Lawrence B.; Knapp, Alan K.; Liu, Jinxun; Liu, Shuguang; Schaeffer, Sean M.
Federal lands greenhouse emissions and sequestration in the United States—Estimates for 2005–14
In January 2016, the Secretary of the U.S. Department of the Interior tasked the U.S. Geological Survey (USGS) with producing a publicly available and annually updated database of estimated greenhouse gas emissions associated with the extraction and use (predominantly some form of combustion) of fossil fuels from Federal lands. In response, the...
Merrill, Matthew D.; Sleeter, Benjamin M.; Freeman, Philip A.; Liu, Jinxun; Warwick, Peter D.; Reed, Bradley C. Integrating forest inventory data and MODIS data to map species-level biomass in Chinese boreal forests
Timely and accurate knowledge of species-level biomass is essential for forest managers to sustain forest resources and respond to various forest disturbance regimes. In this study, maps of species-level biomass in Chinese boreal forests were generated by integrating Moderate Resolution Imaging Spectroradiometer (MODIS) images with forest...
Zhang, Qinglong; He, Hong S.; Liang, Yu; Hawbaker, Todd J.; Henne, Paul D.; Liu, Jinxun; Huang, Shengli; Wu, Zhiwei; Huang, Chao Effects of contemporary land-use and land-cover change on the carbon balance of terrestrial ecosystems in the United States
Changes in land use and land cover (LULC) can have profound effects on terrestrial carbon dynamics, yet their effects on the global carbon budget remain uncertain. While land change impacts on ecosystem carbon dynamics have been the focus of numerous studies, few efforts have been based on observational data incorporating multiple ecosystem types...
Sleeter, Benjamin M.; Liu, Jinxun; Daniel, Colin; Rayfield, Bronwyn; Sherba, Jason T.; Hawbaker, Todd J.; Zhu, Zhiliang; Selmants, Paul; Loveland, Thomas R. Interannual variation in methane emissions from tropical wetlands triggered by repeated El Niño Southern Oscillation
Methane (CH4) emissions from tropical wetlands contribute 60%–80% of global natural wetland CH4 emissions. Decreased wetland CH4 emissions can act as a negative feedback mechanism for future climate warming and vice versa. The impact of the El Niño–Southern Oscillation (ENSO) on CH4 emissions from wetlands remains poorly quantified at both...
Zhu, Qiuan; Peng, Changhui; Ciais, Philippe; Jiang, Hong; Liu, Jinxun; Bousquet, Philippe; Li, Shiqin; Chang, Jie; Fang, Xiuqin; Zhou, Xiaolu; Chen, Huai; Liu, Shirong; Lin, Guanghui; Gong, Peng; Wang, Meng; Wang, Han; Xiang, Wenhua; Chen, Jing Simulated effects of nitrogen saturation the global carbon budget using the IBIS model
Over the past 100 years, human activity has greatly changed the rate of atmospheric N (nitrogen) deposition in terrestrial ecosystems, resulting in N saturation in some regions of the world. The contribution of N saturation to the global carbon budget remains uncertain due to the complicated nature of C-N (carbon-nitrogen) interactions and diverse...
Lu, Xuehe; Jiang, Hong; Liu, Jinxun; Zhang, Xiuying; Jin, Jiaxin; Zhu, Qiuan; Zhang, Zhen; Peng, Changhui Climate-driven increase of natural wetland methane emissions offset by human-induced wetland reduction in China over the past three decades
Both anthropogenic activities and climate change can affect the biogeochemical processes of natural wetland methanogenesis. Quantifying possible impacts of changing climate and wetland area on wetland methane (CH4) emissions in China is important for improving our knowledge on CH4 budgets locally and globally. However, their respective and...
Zhu, Qiuan; Peng, Changhui; Liu, Jinxun; Jiang, Hong; Fang, Xiuqin; Chen, Huai; Niu, Zhichun; Gong, Peng; Lin, Guanghui; Wang, Meng; Yang, Yanzheng; Chang, Jie; Ge, Ying; Xiang, Wenhua; Deng, Xiangwen; He, Jin-Sheng Mapping site index and volume increment from forest inventory, Landsat, and ecological variables in Tahoe National Forest, California, USA
High-resolution site index (SI) and mean annual increment (MAI) maps are desired for local forest management. We integrated field inventory, Landsat, and ecological variables to produce 30 m SI and MAI maps for the Tahoe National Forest (TNF) where different tree species coexist. We converted species-specific SI using adjustment factors. Then, the...
Huang, Shengli; Ramirez, Carlos; Conway, Scott; Kennedy, Kama; Kohler, Tanya; Liu, Jinxun Estimating 40 years of nitrogen deposition in global biomes using the SCIAMACHY NO2 column
Owing to human activity, global nitrogen (N) cycles have been altered. In the past 100 years, global N deposition has increased. Currently, the monitoring and estimating of N deposition and the evaluation of its effects on global carbon budgets are the focus of many researchers. NO2 columns retrieved by space-borne sensors provide us with a...
Lu, Xuehe; Zhang, Xiuying; Liu, Jinxun; Jin, Jiaxin Estimating carbon sequestration in the piedmont ecoregion of the United States from 1971 to 2010
Background: Human activities have diverse and profound impacts on ecosystem carbon cycles. The Piedmont ecoregion in the eastern United States has undergone significant land use and land cover change in the past few decades. The purpose of this study was to use newly available land use and land cover change data to quantify carbon changes within...
Liu, Jinxun; Sleeter, Benjamin M.; Zhu, Zhiliang; Heath, Linda S.; Tan, Zhengxi; Wilson, Tamara; Sherba, Jason T.; Zhou, Decheng Estimating global natural wetland methane emissions using process modelling: spatio-temporal patterns and contributions to atmospheric methane fluctuations
Aim The fluctuations of atmospheric methane (CH4) that have occurred in recent decades are not fully understood, particularly with regard to the contribution from wetlands. The application of spatially explicit parameters has been suggested as an effective method for reducing uncertainties in bottom-up approaches to wetland CH4 ...
Zhu, Qiuan; Peng, Changhui; Chen, Huai; Fang, Xiuqin; Liu, Jinxun; Jiang, Hong; Yang, Yanzheng; Yang, Gang