Browsing College of Forestry, Wildlife and Environment by Author "Tian, Hanqin"

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Anthropogenic and climatic influences on carbon fluxes from eastern North America to the Atlantic Ocean: A process-based modeling study

Tian, Hanqin; Yang, Qichun; Najjar, Raymond; Ren, Wei; Friedrichs, Marjorie; Hopkinson, Charles; Pan, Shufen; 0000-0002-1806-4091; 0000-0002-4840-4835; 0000-0003-2828-7595; 0000-0002-8689-2550; 0000-0001-7920-1427; 0000-0002-7331-8322 (2026-02-05)

The magnitude, spatiotemporal patterns, and controls of carbon flux from land to the ocean remain uncertain. Here we applied a process-based land model with explicit representation of carbon processes in streams and rivers ...

Century-long increasing trend and variability of dissolved organic carbon export from the Mississippi River basin driven by natural and anthropogenic forcing

Ren, Wei; Tian, Hanqin; Cai, Wei-Jun; Lohrenz, Steven E.; Hopkinson, Charles S; Huang, Wei-Jen; Yang, Jia; Tao, Bo; Pan, Shufen; He, Ruoying; 0000-0002-1806-4091; 0000-0001-7920-1427 (2020-04-02)

There has been considerable debate as to how natural forcing and anthropogenic activities alter the timing and magnitude of the delivery of dissolved organic carbon (DOC) to the coastal ocean, which has ramifications for ...

Chesapeake Bay nitrogen fluxes derived from a land-estuarine ocean biogeochemical modeling system: Model description, evaluation, and nitrogen budgets

Feng, Yang; Friedrichs, Marjorie; Wilkin, John; Tian, Hanqin; Yang, Qichun; Hofmann, Eileen; Wiggert, Jerry; Hood, Raleigh; 0000-0002-1806-4091; 0000-0002-5444-9466; 0000-0002-7248-3481; 0000-0002-8689-2550; 0000-0003-2828-7595 (2026-01-30)

The Chesapeake Bay plays an important role in transforming riverine nutrients before they are exported to the adjacent continental shelf. Although the mean nitrogen budget of the Chesapeake Bay has been previously estimated ...

China's land cover and land use change from 1700 to 2005: Estimations from high‐resolution satellite data and historical archives

Liu, Mingliang; Tian, Hanqin; 0000-0002-1806-4091; 0000-0002-1963-5933 (2022-03-03)

One of the major limitations in assessing the impacts of human activities on globalbiogeochemical cycles and climate is a shortage of reliable data on historical landcover and land use change (LCLUC). China had extreme ...

China's terrestrial carbon balance: Contributions from multiple global change factors

Tian, Hanqin; Melillo, Jerry; Lu, Chaoqun; Kicklighter, David; Liu, Mingliang; Ren, Wei; Xu, Xiaofeng; Chen, Guangsheng; Zhang, Chi; Pan, Shufen; Liu, Jiyuan; Running, Steven; 0000-0002-1806-4091; 0000-0001-7920-1427 (2022-03-04)

The magnitude, spatial, and temporal patterns of the terrestrial carbon sink and theunderlying mechanisms remain uncertain and need to be investigated. China is importantin determining the global carbon balance in terms ...

Contribution of increasing CO2 and climate change to the carbon cycle in China's ecosystems

Mu, Qiaozhen; Zhao, Maosheng; Running, Steven; Liu, Mingliang; Tian, Hanqin; 0000-0002-1806-4091; 0000-0002-1963-5933 (2022-12-06)

Atmospheric CO2 and China's climate have changed greatly during 1961-2000. The influence of increased CO2 and changing climate on the carbon cycle of the terrestrial ecosystems in China is still unclear. In this article ...

Development of a REgion‐Specific Ecosystem Feedback Fire (RESFire) Model in the Community Earth System Model

Zou, Yufei; Wang, Yuhang; Ke, Ziming; Tian, Hanqin; Yang, Jia; Liu, Yongqiang; 0000-0002-1806-4091 (2020-04-01)

Fires play a critical role in modulating regional and global climate through disturbances on meteorological, biogeochemical, and hydrological processes, while fires are strongly affected by climate, terrestrial ecosystems, ...

Effect of nitrogen deposition on China’s terrestrial carbon uptake in the context of multifactor environmental changes

Lu, Chaoqun; Tian, Hanqin; Liu, Mingliang; Ren, Wei; Xu, Xiaofeng; Chen, Guangshen; Zhang, Chi (2023-09-20)

The amount of atmospheric nitrogen (N) deposited on the land surface has increased globally and by nearly five times in China from 1901 to 2005. Little is known about how elevated reactive N input has affected the carbon ...

Effects of tropospheric ozone pollution on net primary productivity and carbon storage in terrestrial ecosystems of China

Ren, Wei; Tian, Hanqin; Liu, Mingliang; Zhang, Chi; Chen, Guangsheng; Pan, Shufen; Felzer, Benjamin; Xu, Xiaofeng; 0000-0002-4840-4835; 0000-0002-1806-4091; 0000-0001-7920-1427 (2022-12-05)

We investigated the potential effects of elevated ozone (O-3) along with climate variability, increasing CO2, and land use change on net primary productivity (NPP) and carbon storage in China's terrestrial ecosystems for ...

Global Nitrous Oxide Emissions From Pasturelands and Rangelands: Magnitude, Spatiotemporal Patterns, and Attribution

Dangal, Shree R. S.; Tian, Hanqin; Xu, Rongting; Chang, Jinfeng; Canadell, Josep G.; Ciais, Philippe; Pan, Shufen; Yang, Jia; Zhang, Bowen; 0000-0002-1806-4091; 0000-0001-7920-1427 (2020-04-01)

The application of manure and mineral nitrogen (N) fertilizer, and livestock excreta deposition are the main drivers of nitrous oxide (N2O) emissions in agricultural systems. However, the magnitude and spatiotemporal ...

Heavy Precipitation Impacts on Nitrogen Loading to the Gulf of Mexico in the 21st Century: Model Projections Under Future Climate Scenarios

Zhang, Jien; Lu, Chaoqun; Crumpton, William; Jones, Christopher; Tian, Hanqin; Villarini, Gabriele; Schilling, Keith; Green, David; 0000-0002-1806-4091; 0000-0001-9566-2370; 0000-0002-0439-003X (2022-12-02)

While spatial heterogeneity of riverine nitrogen (N) loading is predominantly driven by the magnitude of basin-wide anthropogenic N input, the temporal dynamics of N loading are closely related to the amount and timing of ...

Impacts of Multiple Environmental Changes on Long-Term Nitrogen Loading From the Chesapeake Bay Watershed

Pan, Shufen; Bian, Zihao; Tian, Hanqin; Yao, Yuanzhi; Najjar, Raymond; Friedrichs, Marjorie; Hofmann, Eileen; Xu, Rongting; Zhang, Bowen; 0000-0002-1806-4091; 0000-0003-2828-7595; 0000-0002-8370-0509; 0000-0001-7292-9271; 0000-0003-2387-4598; 0000-0001-6710-4371 (2026-01-30)

Excessive nutrient inputs from land, particularly nitrogen (N), have been found to increase the occurrence of hypoxia and harmful algal blooms in coastal ecosystems. To identify the main contributors of increased N loading ...

Improving Representation of Crop Growth and Yield in the Dynamic Land Ecosystem Model and Its Application to China

Zhang, Jingting; Tian, Hanqin; Yang, Jia; Pan, Shufen; https://orcid.org/0000-0002-1806-4091 (2022-07-29)

To accurately assess the roles of agriculture in securing food security and maintaining environmental sustainability, it is essential to improve the representation of crop growth, development, and yield formation in global ...

Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations

Thomas, Rebecca T.; Prentice, Lain Colin; Graven, Heather; Ciais, Philippe; Fisher, Joshua B; Hayes, Daniel J; Huang, Maoyi; Huntzinger, Deborah N.; Ito, Akihiko; Jain, Atul; Mao, Jiafu; Michalak, Anna M.; Peng, Shushi; Poulter, Benjamin; Ricciuto, Daniel M.; Shi, Xiaoying; Schwalm, Christopher; Tian, Hanqin; Zeng, Ning; 0000-0002-1806-4091 (2020-04-01)

Observations show an increasing amplitude in the seasonal cycle of CO2 (ASC) north of 45 degrees N of 56 +/- 9.8% over the last 50 years and an increase in vegetation greenness of 7.5-15% in high northern latitudes since ...

Increasing Mississippi river discharge throughout the 21st century influenced by changes in climate, land use, and atmospheric CO2

Tao, Bo; Tian, Hanqin; Ren, Wei; Yang, Jia; Yang, Qichun; He, Ruoying; Cai, Weijun; Lohrenz, Steven (2022-09-15)

Previous studies have demonstrated that changes in temperature and precipitation (hereafter climate change) would influence river discharge, but the relative importance of climate change, land use, and elevated atmospheric ...

Integrating a process-based ecosystem model with Landsat imagery to assess impacts of forest disturbance on terrestrial carbon dynamics: Case studies in Alabama and Mississippi

Chen, Guangsheng; Tian, Hanqin; Huang, Chengquan; Prior, Stephen; Pan, Shufen; 0000-0002-1806-4091; 0000-0003-1750-6326; 0000-0001-7920-1427; 0000-0003-0055-9798 (2022-12-02)

Forest ecosystems in the southern United States are dramatically altered by three major disturbances: timber harvesting, hurricane, and permanent land conversion. Understanding and quantifying effects of disturbance on ...

Long-term trends in evapotranspiration and runoff over the drainage basins of the Gulf of Mexico during 19012008

Liu, Mingliang; Tian, Hanqin; Yang, Qichun; Yang, Jia; Song, Xia; Lohren, Steven E.; Cai, Wei-Jun; 0000-0002-1806-4091 (2020-04-01)

The Gulf of Mexico (GOM) is facing large pressures from environmental changes since the beginning of the last century. However, the magnitude and long-term trend of total water discharge to the GOM and the underlying ...

Methane emissions from global rice fields: Magnitude, spatiotemporal patterns, and environmental controls

Zhang, Bowen; Tian, Hanqin; Ren, Wei; Tao, Bo; Lu, Chaoqun; Yang, Jia; Banger, Kamaljit; Pan, Shufen; 0000-0002-1806-4091; 0000-0001-7920-1427 (2020-04-02)

Given the importance of the potential positive feedback between methane (CH4) emissions and climate change, it is critical to accurately estimate the magnitude and spatiotemporal patterns of CH4 emissions from global rice ...

Methane exchange between marshland and the atmosphere over China during 1949-2008

Xu, Xiaofeng; Tian, Hanqin; 0000-0002-1806-4091; 0000-0002-6553-6514 (2020-02-25)

We used a process-based ecosystem model to examine methane (CH4) fluxes in the marshland across China as a result of multifactor global changes during 1949–2008. Our simulated results show a significant declining rate of ...

Net exchanges of CO2, CH4, and N2O between China's terrestrial ecosystems and the atmosphere and their contributions to global climate warming

Tian, Hanqin; Xu, Xiaofeng; Lu, Chaoqun; Liu, Mingliang; Ren, Wei; Chen, Guangsheng; Melillo, Jerry; Liu, Jiyuan; 0000-0002-6553-6514; 0000-0002-1963-5933; 0000-0002-1526-0513; 0000-0002-4840-4835; 0000-0002-1806-4091 (2022-10-25)

China's terrestrial ecosystems have been recognized as an atmospheric CO2 sink; however, it is uncertain whether this sink can alleviate global warming given the fluxes of CH4 and N2O. In this study, we used a process-based ...