Browsing by Supervisor "Schipper, Louis A."
Now showing items 1-20 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 ... -
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. ... -
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 ... -
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 ... -
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 ... -
Fluxes of carbon dioxide and water vapour at a Waikato peat bog
(The University of Waikato, 2003)New Zealand wetlands are threatened entities and the remaining 15% of pre-European freshwater wetlands are important refuges for plant and animal species, while also providing historical information on past environmental ... -
The temperature response of soil respiration from labile and stable carbon
(The University of Waikato, 2020)The effect of temperature on the decomposition of labile and stable carbon (C) in soil is a critical factor in understanding soil C dynamics, particularly under a global warming scenario. Despite the temperature response ... -
Carbon dynamics in restiad peatlands across different timescales
(The University of Waikato, 2020)Peatlands contain one of the largest terrestrial carbon stores on the planet, and one which is known to interact with climate and global biogeochemical cycling of nutrients. Peatlands maintain their carbon primarily through ... -
Dairy farm system solutions that reduce nitrate leaching and their consequences for profitability: Using plantain, fodder beet and oats on a Canterbury case study farm
(The University of Waikato, 2020)Dairy products provide nutrition, energy and income for much of the world. It is currently necessary to continue their supply albeit in a more environmentally sustainable manner. Excess nitrate (NO₃⁻) from dairy cow urine ... -
Evaluation of a denitrifying bioreactor to improve water quality of tertiary treated water using DGT
(The University of Waikato, 2019)A proven nitrogen remediation strategy, denitrifying bioreactors are a low cost, edge-of-field approach for removing nitrate from subsurface drainage waters. The methodology to evaluate the performance of denitrifying ... -
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 ... -
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 ... -
Can naturally occurring glucosinolate related compounds from brassica crops act as biological nitrification inhibitors and reduce nitrous oxide emissions?
(The University of Waikato, 2018)Nitrous oxide (N₂O) is problematic as it is a potent greenhouse gas with a global warming potential about 298 times that of carbon dioxide, and it also contributes to the depletion of stratospheric ozone. The use of ... -
Denitrification response to nutrient enrichment in New Zealand estuaries
(The University of Waikato, 2018)As coastal catchment land use intensifies, estuaries receive increased nutrient and sediment loads, resulting in habitats dominated by muddy organic-rich sediments. Nutrient processing and denitrification in estuarine ... -
Water use efficiency of grazed pastures under contrasting diversity
(The University of Waikato, 2017)Agriculture must increase food production to support a growing global population; however, this required increase in production is potentially restricted by freshwater supply for irrigation. Consequently, relying on ... -
Cadmium accumulation in agricultural soils
(The University of Waikato, 2017)Cadmium (Cd) has accumulated in New Zealand (NZ) soils as a result of phosphate fertiliser application. Cadmium is a biotoxic heavy metal and can be adsorbed by soil and enter the human food chain. Three objectives were ... -
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, ... -
Carbon dioxide and methane emissions from the Te Arawa lakes of Rotorua, New Zealand
(University of Waikato, 2016)One of the biggest issues confronting humankind today is global warming due to the rapidly increasing greenhouse gas (GHG) emissions, namely CO₂, CH₄ and N₂O. The Intergovernmental Panel for Climate Change (IPCC) has ... -
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 ... -
Impacts of conversion from forestry to pasture on soil physical properties of Vitrands (Pumice Soils) in central North Island, New Zealand
(IUSS, 2010-08-01)Tens of thousands of hectares of land have been converted from plantation forest to pasture in the central North Island of New Zealand between 2000 and 2010. The land use change was driven by the perceived better long term ...
