Browsing Auburn Theses and Dissertations by Author "Tian, Hanqin"

Now showing items 1-15 of 15

Anthropogenic and Natural Disturbances of the Nitrogen Cycle at Multiple Scales from Local to Global: A Modeling Investigation of Nitrous Oxide and Ammonia Emissions

Xu, Rongting (2019-04-18)

Nitrogen (N) is an essential element that affects natural vegetation and crop growth in terrestrial and aquatic ecosystems. Meanwhile, N is tightly coupled with carbon and other nutrients (e.g., phosphorous) that influence ...

Dynamics of Carbon and Water Fluxes in the Southern United States in Responses to Changes in Climate and Atmospheric Composition during 1900-2099

Song, Xia (2011-05-18)

The southern United States (SUS) has experienced dramatic changes in climate, atmospheric composition, and land cover type over the past century. These changes are expected to be continuous in this century, which may ...

Dynamics of Crop Production and Greenhouse Gas Balance in a Changing Environment: Data-Driven Systems Approach for Sustainable Agriculture in the United States

You, Yongfa (2023-11-17) ETD File Embargoed

Contemporary agriculture faces multiple pressing challenges, particularly feeding a growing world population and mitigating climate change. During the past several decades, climate change has significantly impacted crop ...

Effects of Disturbance and Land Management on Water, Carbon, and Nitrogen Dynamics in the Terrestrial Ecosystems of the Southern United States

Chen, Guangsheng (2010-12-02)

Although the climate in the Southern United States (SUS) is warm and wet, with mild winters and high humidity, the terrestrial ecosystems in this region have been greatly disturbed. These disturbances include hurricanes, ...

Effects of Ozone Pollution and Climate Variability/Change on Spatial and Temporal Patterns of Terrestrial Primary Productivity and Carbon Storage in China

Ren, Wei (2009-12-08)

Over the past several decades, China’s terrestrial ecosystems have experienced severe air pollution and other environmental changes. Quantifying how these environmental changes have affected carbon (C) fluxes and storage ...

Global fire activities and their impacts on the terrestrial carbon budget in context of multiple environmental changes

Yang, Jia (2015-07-28)

As one major disturbance in the earth system, fires modified vegetation structure and functioning, atmospheric composition, and climate conditions at both regional and global scales. Under the impacts of substantial changes ...

Greenhouse Gas Emissions from Inland Waters in the Conterminous United States: a Process-based Modeling Study

Yao, Yuanzhi (2019-12-05)

The growing awareness of global warming promotes great interest in investigating the magnitude, spatial, and temporal patterns of the major greenhouse gas (CO2, CH4, and N2O) emissions in the earth systems. The Greenhous ...

The influences of phosphorus cycling on the tropical ecosystem carbon cycle-A process-based modeling study

Wang, Zhuonan (2021-08-03)

The biogeochemical processes of phosphorous (P), carbon (C), and nitrogen (N) in the Earth system are fully coupled, which shapes the structure, functioning, and dynamics of terrestrial ecosystems. However, incorporating ...

Interactive Effects of Climate Change and Grazing on Ecosystem Productivity and Greenhouse Gas Balance at Multiple Scales from Landscape to Global

Sharma Dangal, Shree Ram (2017-04-20)

The Anthropocene is facing several critical challenges in the 21st century due to increasing impacts of human activities such as deforestation, urbanization, agriculture and fossil fuel burning. Human activities alter ...

Methane Exchanges between Terrestrial Ecosystems and the Atmosphere in Response to Multiple Environmental Changes - A Process-Based Modeling Study

Zhang, Bowen (2016-07-29)

Methane (CH4), the most abundant non-carbon dioxide (CO2) greenhouse gas, has a relatively shorter lifetime (approx. 9 years) and higher global warming potential (approx. 28 times) than CO2 at a 100-year time horizon. The ...

Modeling Methane and Nitrous Oxide Exchanges between the Atmosphere and Terrestrial Ecosystems over North America in the Context of Multifactor Global Change

Xu, Xiaofeng (2010-11-19)

Methane (CH4) and nitrous oxide (N2O) are two potent greenhouse gases which in sum contribute to more than one fourth of global warming caused by anthropogenic activities. In the meantime, CH4 and N2O play significant roles ...

Net Exchanges of carbon dioxide, methane, and nitrous oxide between Terrestrial Ecosystems and the Atmosphere in Tropical Asia during 1901–2010

Banger, Kamaljit (2015-07-22)

Terrestrial ecosystems act as important sources of the greenhouse gases (GHGs) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), which cause climate warming. Therefore, understanding and quantification ...

Nitrogen and Phosphorus Dynamics along the Terrestrial-Ocean Continuum in Changing Environment: Integrating Geospatial Data with Process-based Model

Bian, Zihao (2022-06-01)

Nitrogen (N) and Phosphorus (P) are critical elements required by organisms for cellular processes and are the key limiting nutrients in most terrestrial and aquatic ecosystems. However, massive nutrients have entered the ...

Role of Climate, Land Use/Cover and Water Quality on West Nile Virus Incidence: A Modeling Approach

Noori, Navideh (2015-07-02)

West Nile virus (WNV), a vector-borne infectious disease, has been a major public health concern in North America since 1999. This virus is transmitted to susceptible mosquitoes when they feed on infected birds. Infected ...

Terrestrial Carbon Dynamics of Southern United States in Response to Changes in Climate, Atmosphere, and Land-Use/Land Cover from 1895 to 2005

Zhang, Chi (2008-05-15)

Historical human activities and environmental changes have strongly modified the global carbon cycle, which can lead to both an energy shortage and environmental problems such as global warming due to elevated atmospheric ...