title: Assessing acid rain and climate effects on the temporal variation of dissolved organic matter in the unsaturated zone of a karstic system from southern China

authors: Liao, Jin

subjects: Science & Technology

abstract: Acid rain has the potential to significantly impact the quantity and quality of dissolved organic matter (DOM) leached from soil to groundwater. Yet, to date, the effects of acid rain have not been investigated in karstic systems, which are expected to strongly buffer the pH of atmospheric rainfall. This study presents a nine-year DOM fluorescence dataset from a karst unsaturated zone collected from two drip sites (HS4, HS6) in Heshang Cave, southern China between 2005 and 2014. Cross-correlograms show that fluorescence intensity of both dripwaters lagged behind rainfall by ∼1 year (∼11 months lag for HS4, and ∼13 months for HS6), whereas drip rates responded quite quickly to rainfall (0 months lag for HS4, and ∼3 months for HS6), based on optimal correlation coefficients. The rapid response of drip rates to rainfall is related to the change of reservoir head pressure in summer, associated with higher rainfall. In winter, low rainfall has a limited effect on head pressure, and drip rates gradually slow to a constant value associated with base flow from the overlying reservoir- this effect being most evident on inter-annual timescales (R2 = 0.80 for HS4 and R2 = 0.86 for HS6, n = 9, p < 0.01). We ascribed the ∼1 year lag of fluorescence intensity to the effect of the soil moisture deficit and the karst process on delaying water and solute transport. After eliminating the one year lag, the congruent seasonal pacing and amplitude between fluorescence intensity and rainfall observed suggests that the seasonality of fluorescence intensity was mainly controlled by the monsoonal rains which can govern the output of DOM from the soil, as well as the residence time of water in the unsaturated zone. On inter-annual timescales, a robust linear relationship between fluorescence intensity and annual (effective) precipitation amount (R2 = 0.86 for HS4 and R2 = 0.77 for HS6, n = 9, p < 0.01) was identified, implying that annual (effective) precipitation is the main determinant of DOM concentration in the aquifer. Conversely, the insensitivity of fluorescence intensity and fluorescence wavelength maxima to variations in the pH of local rainfall suggests that acid rain over the study period (∼pH 5.6 to ∼ 4.5) had no discernable effect on the quantity and quality of DOM in karst soil and soil solution, likely being strongly buffered by soil carbonates. Therefore, despite large increases in anthropogenic acid rain in recent Chinese history, hydrologic forcing is the predominant factor driving variations in DOM in karst aquifers.

text: Assessing acid rain and climate effects on the temporal variation of dissolved organic matter in the unsaturated zone of a karstic system from southern China Acid rain has the potential to significantly impact the quantity and quality of dissolved organic matter (DOM) leached from soil to groundwater. Yet, to date, the effects of acid rain have not been investigated in karstic systems, which are expected to strongly buffer the pH of atmospheric rainfall. This study presents a nine-year DOM fluorescence dataset from a karst unsaturated zone collected from two drip sites (HS4, HS6) in Heshang Cave, southern China between 2005 and 2014. Cross-correlograms show that fluorescence intensity of both dripwaters lagged behind rainfall by ∼1 year (∼11 months lag for HS4, and ∼13 months for HS6), whereas drip rates responded quite quickly to rainfall (0 months lag for HS4, and ∼3 months for HS6), based on optimal correlation coefficients. The rapid response of drip rates to rainfall is related to the change of reservoir head pressure in summer, associated with higher rainfall. In winter, low rainfall has a limited effect on head pressure, and drip rates gradually slow to a constant value associated with base flow from the overlying reservoir- this effect being most evident on inter-annual timescales (R2 = 0.80 for HS4 and R2 = 0.86 for HS6, n = 9, p < 0.01). We ascribed the ∼1 year lag of fluorescence intensity to the effect of the soil moisture deficit and the karst process on delaying water and solute transport. After eliminating the one year lag, the congruent seasonal pacing and amplitude between fluorescence intensity and rainfall observed suggests that the seasonality of fluorescence intensity was mainly controlled by the monsoonal rains which can govern the output of DOM from the soil, as well as the residence time of water in the unsaturated zone. On inter-annual timescales, a robust linear relationship between fluorescence intensity and annual (effective) precipitation amount (R2 = 0.86 for HS4 and R2 = 0.77 for HS6, n = 9, p < 0.01) was identified, implying that annual (effective) precipitation is the main determinant of DOM concentration in the aquifer. Conversely, the insensitivity of fluorescence intensity and fluorescence wavelength maxima to variations in the pH of local rainfall suggests that acid rain over the study period (∼pH 5.6 to ∼ 4.5) had no discernable effect on the quantity and quality of DOM in karst soil and soil solution, likely being strongly buffered by soil carbonates. Therefore, despite large increases in anthropogenic acid rain in recent Chinese history, hydrologic forcing is the predominant factor driving variations in DOM in karst aquifers.

year: 2018

title: Towards a neoliberal citizenship regime: A post-Marxist discourse analysis

authors: Hackell, Melissa

subjects: discourse

abstract: This thesis is empirically grounded in New Zealand's restructuring of unemployment and taxation policy in the 1980s and 1990s.  Theoretically it is inspired by a post-Marxist discourse analytical approach that focuses on discourses as political strategies.  This approach has made it possible, through an analysis of changing citizenship discourses, to understand how the neoliberalisation of New Zealand's citizenship regime proceeded via debate and struggle over unemployment and taxation policy.  

Debates over unemployment and taxation in New Zealand during the 1980s and 1990s reconfigured the targets of policy and re-ordered social antagonism, establishing a neoliberal citizenship regime and centring political problematic.  This construction of a neoliberal citizenship regime involved re-specifying the targets of public policy as consumers and taxpayers.  In exploring the hegemonic discourse strategies of the Fourth Labour Government and the subsequent National-led governments of the 1990s, this thesis traces the process of reconfiguring citizen subjectivity initially as 'social consumers' and participants in a coalition of minorities, and subsequently as universal taxpayers in antagonistic relation to unemployed beneficiaries.  These changes are related back to key discursive events in New Zealand's recent social policy history as well as to shifts in the discourses of politicians that address the nature of the public interest and the targets of social policy.  

I argue that this neoliberalisation of New Zealand's citizenship regime was the outcome of the hegemonic articulatory discourse strategies of governing parties in the 1980s and 1990s.  Struggles between government administrations and citizen-based social movement groups were articulated to the neoliberal project.  I also argue that in the late 1990s, discursive struggle between the dominant parties to define themselves in difference from each other reveals both the 'de'contestation of a set of neoliberal policy prescriptions, underscoring the neoliberal political problematic, and the privileging of a contributing taxpayer identity as the source of political legitimacy.  

This study shows that the dynamics of discursive struggle matter and demonstrates how the outcomes of discursive struggle direct policy change.  In particular, it establishes how neoliberal discourse strategies evolved from political discourses in competition with other discourses to become the hegemonic political problematic underscoring institutional practice and policy development.

text: Towards a neoliberal citizenship regime: A post-Marxist discourse analysis This thesis is empirically grounded in New Zealand's restructuring of unemployment and taxation policy in the 1980s and 1990s.  Theoretically it is inspired by a post-Marxist discourse analytical approach that focuses on discourses as political strategies.  This approach has made it possible, through an analysis of changing citizenship discourses, to understand how the neoliberalisation of New Zealand's citizenship regime proceeded via debate and struggle over unemployment and taxation policy.  

Debates over unemployment and taxation in New Zealand during the 1980s and 1990s reconfigured the targets of policy and re-ordered social antagonism, establishing a neoliberal citizenship regime and centring political problematic.  This construction of a neoliberal citizenship regime involved re-specifying the targets of public policy as consumers and taxpayers.  In exploring the hegemonic discourse strategies of the Fourth Labour Government and the subsequent National-led governments of the 1990s, this thesis traces the process of reconfiguring citizen subjectivity initially as 'social consumers' and participants in a coalition of minorities, and subsequently as universal taxpayers in antagonistic relation to unemployed beneficiaries.  These changes are related back to key discursive events in New Zealand's recent social policy history as well as to shifts in the discourses of politicians that address the nature of the public interest and the targets of social policy.  

I argue that this neoliberalisation of New Zealand's citizenship regime was the outcome of the hegemonic articulatory discourse strategies of governing parties in the 1980s and 1990s.  Struggles between government administrations and citizen-based social movement groups were articulated to the neoliberal project.  I also argue that in the late 1990s, discursive struggle between the dominant parties to define themselves in difference from each other reveals both the 'de'contestation of a set of neoliberal policy prescriptions, underscoring the neoliberal political problematic, and the privileging of a contributing taxpayer identity as the source of political legitimacy.  

This study shows that the dynamics of discursive struggle matter and demonstrates how the outcomes of discursive struggle direct policy change.  In particular, it establishes how neoliberal discourse strategies evolved from political discourses in competition with other discourses to become the hegemonic political problematic underscoring institutional practice and policy development.

year: 2007

title: Can te ao Māori worldviews exist within a western institute’s online teaching and learning environment?

authors: Hudson, Petera Whaiao

subjects: whakawhanaungatanga

abstract: Tertiary institutions in Aotearoa (New Zealand) offer students online teaching and learning papers across a variety of disciplines. The purpose of this research was to examine whether online teaching and learning environments in a tertiary institute provide opportunities to create conditions that promote te ao Māori (a Māori world view) aspirations for Māori scholars. Following a critical review of selected literature on how technologies and its pedagogical implications can realise cultural, educational, political and social aspirations in an online environment (see Chapter 2), the ethical practices according to Kaupapa Māori theory methodology, whakawhanaungatanga and spiral discourse is outlined (see Chapter 3). These practices together with spiral discourse and conversation analysis, were used to analyse the factors that facilitated or hindered optimal conditions that promoted teacher and student aspirations in the online environment (see Chapter 4). That analysis, conducted in relation to a number of focus points, revealed that when Māori practices of tikanga and ako pedagogy were applied in this realm, Māori scholars experienced the fulfilment of personal aspirations. Participants also experienced positive outcomes when whanaungatanga, the creation of interrelationships relationships between Māori students and teachers, whānau, friends, colleagues, was a focus together with good support facilities and services, and quality resources. This research supports the conclusion that online teaching and learning environments in a tertiary institute can provide opportunities to create conditions that promote te ao Māori aspirations for Māori scholars. Further investigations are needed to unravel the types and nature of the interrelationships between ako Māori pedagogies and the student and teacher, and whanaungatanga between students and other students that facilitate conditions that promoted Māori aspirations in an online environment.

text: Can te ao Māori worldviews exist within a western institute’s online teaching and learning environment? Tertiary institutions in Aotearoa (New Zealand) offer students online teaching and learning papers across a variety of disciplines. The purpose of this research was to examine whether online teaching and learning environments in a tertiary institute provide opportunities to create conditions that promote te ao Māori (a Māori world view) aspirations for Māori scholars. Following a critical review of selected literature on how technologies and its pedagogical implications can realise cultural, educational, political and social aspirations in an online environment (see Chapter 2), the ethical practices according to Kaupapa Māori theory methodology, whakawhanaungatanga and spiral discourse is outlined (see Chapter 3). These practices together with spiral discourse and conversation analysis, were used to analyse the factors that facilitated or hindered optimal conditions that promoted teacher and student aspirations in the online environment (see Chapter 4). That analysis, conducted in relation to a number of focus points, revealed that when Māori practices of tikanga and ako pedagogy were applied in this realm, Māori scholars experienced the fulfilment of personal aspirations. Participants also experienced positive outcomes when whanaungatanga, the creation of interrelationships relationships between Māori students and teachers, whānau, friends, colleagues, was a focus together with good support facilities and services, and quality resources. This research supports the conclusion that online teaching and learning environments in a tertiary institute can provide opportunities to create conditions that promote te ao Māori aspirations for Māori scholars. Further investigations are needed to unravel the types and nature of the interrelationships between ako Māori pedagogies and the student and teacher, and whanaungatanga between students and other students that facilitate conditions that promoted Māori aspirations in an online environment.

year: 2020