Browsing by Supervisor "Campbell, David I."
Now showing items 1-20 of 26
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Adaptation of New Zealand dairy farms to climate change: An integrated, farm-level analysis
(University of Waikato, 2015)The dairy sector is a cornerstone of the New Zealand economy and as such, it is important to understand the ways in which it is likely to be affected by climate change, whether it will need to adapt, and if so, how this ... -
An investigation of soil moisture associated with ephemeral streams, Wright Valley, Antarctica
(The University of Waikato, 2005)Ephemeral streams in Wright Valley, Antarctica, are fed by glacial melt and flow for between four and ten weeks annually. Hyporheic zones develop concomitantly with ephemeral stream channels. These zones are areas of ... -
Assessing dissolved organic carbon export from Kopuatai bog, New Zealand
(University of Waikato, 2013)Peatlands sequester carbon (C) through CO₂ uptake and, ultimately, storage as peat. Carbon is lost from peatlands though gaseous pathways (as CO₂ and CH₄) and water pathways as dissolved organic C (DOC), dissolved inorganic ... -
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 ... -
Carbon dioxide losses from terrestrial organic matter resulting from photodegradation and microbial respiration
(University of Waikato, 2010)Losses of soil organic matter (SOM) can lead to a decrease in soil quality, cause an increase in CO₂ emissions, thereby contributing to a rise in atmospheric CO₂ concentration, which in turn can affect the global climate. ... -
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 ... -
Characterising the temperature dependence of anaerobic CH₄ and CO₂ production from intact and drained New Zealand peatlands
(The University of Waikato, 2021)Understanding the temperature response of anaerobic microbial processes in wetlands is important in determining consequences for carbon dynamics and the production of methane (CH₄) under climate warming scenarios. Natural ... -
Contribution of Dissolved Organic Carbon Leaching to the Annual Carbon Budget of a Dairy Farm
(University of Waikato, 2013)Soils are the largest terrestrial store of carbon (C) and changes in this store of C can impact on soil quality and atmospheric CO2 concentrations. Research on C budgets at paddock to national scales has focused most ... -
Ecohydrological characterisation of Otakairangi wetland, Northland
(The University of Waikato, 2019)Otakairangi wetland is a 2.6 km² remnant wetland located on the western edge of the Wairua River floodplain, around 15 km north-west from Whangarei. Otakairangi has experienced over 100 years of degradation with long term ... -
Ecohydrological characterisation of Whangamarino wetland
(University of Waikato, 2011)The Whangamarino wetland is internationally recognised and one of the most important lowland wetland ecosystems in the Waikato Region. The wetland’s hydrology has been altered by reduced river base levels, the installation ... -
Flows of water and nutrients to Lake Tarawera and connected lakes
(The University of Waikato, 2022)Lake Tarawera is a large, deep lake located within the Taupō Volcanic zone, 12 km south-east of Rotorua. Seven smaller lakes within the “Greater Lake Tarawera catchment” (Lakes Ōkareka, Ōkaro, Ōkataina, Rerewhakaaitu, ... -
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 ... -
'Hass' avocado tree water use and the effects of water stress on fruit development
(The University of Waikato, 2020)‘Hass’ avocado tree water use and the effects of water deficits on fruit development were assessed in New Zealand from 2017 to 2019. Avocado tree water use was quantified by sap flow measurement and the soil water balance ... -
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 ... -
Methane emission hotspots from a drained peat soil under dairy grazing
(The University of Waikato, 2019)Methane (CH4) is a greenhouse gas that is emitted from natural peatland ecosystems due to their high water tables. However, large areas of natural peatlands have been drained for agricultural purposes, resulting in a ... -
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 ... -
Peat soil properties and seasonal surface elevation changes of drained Waikato peatlands
(The University of Waikato, 2022)Peat surface oscillation (PSO) is the elastic seasonal change in peatland surface elevation that occurs as a response to changes in the water balance, and is an important self-regulating behaviour for sustaining hydrological ... -
Soils and hydrology of Seabee Hook, Cape Hallett, Antarctica
(The University of Waikato, 2006)The soils and hydrology of Seabee Hook, Cape Hallett, Antarctica were investigated during the 2003-04 and 2004-05 summer periods. Seabee Hook is a low lying spit that has been built up by the deposition of material, from ... -
Spatiotemporal variability of hydrology in Moanatuatua drained peatland and its influence on CO₂ emissions and surface oscillations
(The University of Waikato, 2020)Drained agricultural peatlands can be highly productive but problematic ecosystems, including releasing substantial carbon dioxide (CO₂) emissions to the atmosphere as peat decomposes. The ongoing and permanent loss of ... -
Surface oscillation in peatlands: How variable and important is it?
(The University of Waikato, 2006)Hydrology, particularly the water table position below the surface, is an important control on biogeochemical and ecological processes in peatlands. The position of the water table is a function of total storage changes, ...
