Browsing by Supervisor "Schipper, Louis A."
Now showing items 21-40 of 42
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Improved determination of nitrate concentrations and flow rates in freshwater using ‘Diffusive Gradients in Thin-films’
(The University of Waikato, 2021)Nutrient pollution, particularly by nitrate, is a persistent issue in waterways. Numerous mitigation strategies have been developed to address this pollution, such as denitrifying bioreactors. The monitoring, however, of ... -
Leaching and uptake of nitrogen, and pasture production, associated with irrigation of treated wastewater, Taupō, New Zealand
(University of Waikato, 2013)Secondary-treated wastewater from Taupō Township is irrigated onto perennial ryegrass (Lolium perenne) which is harvested and removed from the View Road wastewater treatment site. To determine the fate of the applied ... -
Limited changes in microbial respiration along a geothermal gradient
(The University of Waikato, 2021)Soil carbon is the largest terrestrial stock of carbon (C) globally. This C stock has the potential to be negatively impacted by global warming through the acceleration of microbial respiration via positive feedback loops. ... -
Long term nitrate removal in a denitrification wall
(University of Waikato, 2011)Nitrogen (N) inputs to groundwater are one of the most widespread environmental problems globally. However, as N is important for crop production to support the current global population, it is difficult to limit N input ... -
Magnitude and controls on the net carbon balance of a New Zealand raised bog
(University of Waikato, 2015)Peatlands play an important role in the Earth system as both persistent carbon dioxide (CO₂) sinks and methane (CH₄) sources. However, large uncertainties remain in our understanding of peatland carbon cycle – climate ... -
Manipulation of carbon media, temperature and hydraulic efficiency to increase nitrate removal rate in denitrification beds
(University of Waikato, 2011)The accumulation of reactive nitrogen (Nr) in terrestrial and aquatic environments is a global environmental issue that causes or contributes to climate change, stratospheric ozone depletion, and deterioration of coastal ... -
Measuring the temperature response of soil respiration from two distinct carbon pools in soil.
(The University of Waikato, 2020)As soils contain a large store of terrestrial carbon, understanding the dynamics and stability of this important carbon reserve and how it may change with regards to future changes in temperature is of global interest. It ... -
Microbial contaminant removal and alternative nitrogen removal pathways in denitrifying bioreactors
(The University of Waikato, 2019)Denitrifying bioreactors, simple treatment systems consisting of a container filled with a particulate organic carbon source, are an effective and low-cost technology for the effective removal of nitrogen (N) from water ... -
Microbial Processes and Nitrate removal in Denitrification Beds
(University of Waikato, 2011)Abstract The anthropogenic abundance of reactive nitrogen (N) forms has increased in the last few decades, increasing food production, but also resulting in increased eutrophication, algae blooms, loss of biodiversity, and ... -
Nitrogen leaching from effluent irrigated pasture
(University of Waikato, 2011)The surface waters of the Taupo region are of high quality and are sensitive to inputs of nitrogen. To reduce the amount of nitrogen discharged to surface water, the Taupo District Council (TDC) has employed a land treatment ... -
Paddock scale nitrous oxide emissions from intensively grazed pasture: Quantification and mitigation
(The University of Waikato, 2021)Agricultural soils are the main contributor to global emissions of the potent greenhouse gas nitrous oxide (N₂O) to the atmosphere. Nitrous oxide can absorb and transform radiative energy emitted from the sun to earth into ... -
Root Biomass under Range of Pasture Swards -Implications for Soil Carbon Stocks
(University of Waikato, 2015)Soil carbon (C) is the largest terrestrial store of carbon, greater than all other pools combined. Root biomass is recognised as an important contributor to the accumulation of soil C and recent studies have suggested that ... -
Soil carbon loss under pasture and pine: Responses to urine addition
(University of Waikato, 2012)There have been reports of losses of soil carbon (C) in New Zealand pastures under dairy grazing. Acceleration of mineralisation or leaching of soil C following urine deposition may decrease soil C. However, little ... -
Studies on carbon and DNA preservation in allophanic soils and paleosols on Holocene tephras in New Zealand
(University of Waikato, 2016)The recovery of ancient DNA (aDNA) and palaeoenvironmental DNA (PalEnDNA) from soils and sediments has enabled detailed paleontological and ecological records to be obtained. Because of the superior ability of allophanic ... -
Temperature and Moisture Sensitivity of Soil Microbial Respiration in Adjacent Irrigated and Non-Irrigated Soils
(University of Waikato, 2017)Irrigation is a commonly used management practice that is crucial for increasing plant growth and production, especially in areas prone to drought such as the Canterbury region of the South Island, New Zealand. Historically, ... -
Temperature Sensitivity of Soil Respiration
(University of Waikato, 2016)Biogeochemical cycles, such as the carbon (C) cycle, are being continuously affected by anthropogenic activities such as carbon dioxide (CO₂) release from fossil fuels and the decomposition of soil organic C following some ... -
The effects of irrigation on soil carbon and nitrogen stocks of pumice soils
(The University of Waikato, 2018)The use of irrigation has become important for sustaining the production of food, fibre and biofuel. In New Zealand (NZ), irrigation of pastures is increasing in areas with seasonal water deficits, such as the Central North ... -
The impact of maize silage production and supplementary feed use on the carbon balance of New Zealand dairy farms
(The University of Waikato, 2021)Globally, agriculture contributes 10-12% to anthropogenic greenhouse gas (GHG) emissions. Consequently, mitigation of agricultural GHGs has taken on increased importance, particularly in countries like New Zealand where ... -
The role of Empodisma robustum litter in CO₂ exchange at Kopuatai bog
(University of Waikato, 2014)Respiration from the decomposition of standing dead litter in peatlands influences the ecosystem carbon balance through its contribution to total ecosystem respiration (ER). This research determined the proportion of ER ... -
The temperature response of nitrate removal in denitrification beds
(University of Waikato, 2014)The addition of reactive nitrogen (Nᵣ) to agricultural systems has helped crop production match human population growth. However, the addition of Nᵣ comes at a cost to environment in the form of ozone destruction, habitat ...
