Browsing by Supervisor "Campbell, David I."
Now showing items 1-20 of 26
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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 ... -
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, ... -
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 ... -
'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 ... -
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 influence of fire on vegetation dynamics of a New Zealand restiad bog
(The University of Waikato, 2020)New Zealand restiad bogs have a history of natural fire, yet little is known about their fire ecology compared to other frequently burnt ecosystems. Previous research has identified general vegetation recovery trends, but ... -
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 ... -
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 ... -
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 ... -
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 ... -
Use of Time Domain Reflectometry (TDR) to determine moisture and temperature regimes in Antarctic soils
(The University of Waikato, 2004)Antarctic soil moisture and temperature data are important as the soil climate influence. Antarctic ecosystems, and the data may provide information on climate change, and the effects of human activities on the Antarctic ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ...
