title: Modelling attribute non-attendance in choice experiments for rural landscape valuation

authors: Scarpa, Riccardo

subjects: attribute non-attendance

abstract: Non-market effects of agriculture are often estimated using discrete choice models from stated preference surveys. In this context we propose two ways of modelling attribute non-attendance. The first involves constraining coefficients to zero in a latent class framework, whereas the second is based on stochastic attribute selection and grounded in Bayesian estimation. Their implications are explored in the context of a stated preference survey designed to value landscapes in Ireland. Taking account of attribute non-attendance with these data improves fit and tends to involve two attributes one of which is likely to be cost, thereby leading to substantive changes in derived welfare estimates.

text: Modelling attribute non-attendance in choice experiments for rural landscape valuation Non-market effects of agriculture are often estimated using discrete choice models from stated preference surveys. In this context we propose two ways of modelling attribute non-attendance. The first involves constraining coefficients to zero in a latent class framework, whereas the second is based on stochastic attribute selection and grounded in Bayesian estimation. Their implications are explored in the context of a stated preference survey designed to value landscapes in Ireland. Taking account of attribute non-attendance with these data improves fit and tends to involve two attributes one of which is likely to be cost, thereby leading to substantive changes in derived welfare estimates.

year: 2009

title: Remediation of Pulp and Paper Mill Biosolids using Vermiculture

authors: Shannon, Nicholas W.

subjects: Biosolids

abstract: Historical wastewater treatment systems at a New Zealand pulp and paper mill, resulted in a biosolid mass in the K-basin at Kinleith mill. Products extracted during the pulping process include resin acids, which are further transformed in the K-basin by microbial activity into recalcitrant end products retene and fichtelite. These products are toxic to fish due to bioaccumulation and subsequent endocrine disruption. Traditional methods for diverting these toxins from waterways were deposition into landfills and incineration, neither of which are considered environmentally sound. The aim of this study was to investigate the viability of vermicomposting as a method for bioremediation of recalcitrant resin acid derivatives from biosolids. Vermicomposting is a cost-effective option for not only reducing toxicity but also reducing biomass. It was hypothesised that earthworms can degrade organic extractives, principally resin acids and derivatives, through microbial, enzymatic, and oxidative mechanisms. A series of vermicomposting experiments were set up, to test the ability of Eisenia fetida (the tiger worm) to reduce both the amount of resin acids and overall biomass in a range of substrates. These included the original biosolid collected from K-basin, a  simulated  biosolid containing potting mix with and without additional extractive resins, as well as sterilised and unsterilised controls.  Five samples were taken from each experimental composter over 28 days and extracted into dichloromethane after removal of excess water followed by mechanical blending. Samples were concentrated and the amount of each extractive group was determined using gas chromatography mass spectroscopy. The overall biomass in each composter as well as the depurated earthworm mass was measured at the start and cessation of the experiment.  A slight reduction in biomass was observed in two out of the three substrates. This reduction was slightly enhanced by the presence of earthworms in the composter, however, it was not significant. The use of methyl bromide to sterilise the substrate was also not a significant factor in biomass reduction.  The overall weight of the earthworms decreased in all cases indicating the unsuitability of any of the substrates as a desirable food source. The addition of supplements such as yeast or manure to the biosolid composter may increase its appeal.
There was a significant reduction in extractive content in all substrates over the 28 day period however no significant difference attributable to the presence or absence of worms was observed.  It was hypothesised that the rigorous sampling process encouraged oxidative breakdown of the extractives due to increased exposure to both air and light. This was evident when the extractive content of K-basin measured in 1993 was compared to the samples used in this study collected in 2006.
Whilst vermicomposting does not appear to be an effective treatment for removing resin acids from biosolid mass, the sampling processes used in this study highlighted the effect that rigorous stirring and increased exposure to air and light can have on the natural breakdown of these products. An effective treatment for the removal of resin acids from K-basin may be as simple as regular ploughing.

text: Remediation of Pulp and Paper Mill Biosolids using Vermiculture Historical wastewater treatment systems at a New Zealand pulp and paper mill, resulted in a biosolid mass in the K-basin at Kinleith mill. Products extracted during the pulping process include resin acids, which are further transformed in the K-basin by microbial activity into recalcitrant end products retene and fichtelite. These products are toxic to fish due to bioaccumulation and subsequent endocrine disruption. Traditional methods for diverting these toxins from waterways were deposition into landfills and incineration, neither of which are considered environmentally sound. The aim of this study was to investigate the viability of vermicomposting as a method for bioremediation of recalcitrant resin acid derivatives from biosolids. Vermicomposting is a cost-effective option for not only reducing toxicity but also reducing biomass. It was hypothesised that earthworms can degrade organic extractives, principally resin acids and derivatives, through microbial, enzymatic, and oxidative mechanisms. A series of vermicomposting experiments were set up, to test the ability of Eisenia fetida (the tiger worm) to reduce both the amount of resin acids and overall biomass in a range of substrates. These included the original biosolid collected from K-basin, a  simulated  biosolid containing potting mix with and without additional extractive resins, as well as sterilised and unsterilised controls.  Five samples were taken from each experimental composter over 28 days and extracted into dichloromethane after removal of excess water followed by mechanical blending. Samples were concentrated and the amount of each extractive group was determined using gas chromatography mass spectroscopy. The overall biomass in each composter as well as the depurated earthworm mass was measured at the start and cessation of the experiment.  A slight reduction in biomass was observed in two out of the three substrates. This reduction was slightly enhanced by the presence of earthworms in the composter, however, it was not significant. The use of methyl bromide to sterilise the substrate was also not a significant factor in biomass reduction.  The overall weight of the earthworms decreased in all cases indicating the unsuitability of any of the substrates as a desirable food source. The addition of supplements such as yeast or manure to the biosolid composter may increase its appeal.
There was a significant reduction in extractive content in all substrates over the 28 day period however no significant difference attributable to the presence or absence of worms was observed.  It was hypothesised that the rigorous sampling process encouraged oxidative breakdown of the extractives due to increased exposure to both air and light. This was evident when the extractive content of K-basin measured in 1993 was compared to the samples used in this study collected in 2006.
Whilst vermicomposting does not appear to be an effective treatment for removing resin acids from biosolid mass, the sampling processes used in this study highlighted the effect that rigorous stirring and increased exposure to air and light can have on the natural breakdown of these products. An effective treatment for the removal of resin acids from K-basin may be as simple as regular ploughing.

year: 2009

title: Ko ia tonu te rangatira o tana mauri: Ko te Mauritau hei tohu o te puāwaitanga o Te Aho Matua i te Kura Kaupapa Māori o Hoani Waititi Marae

authors: Angeli-Gordon, Joni Māramatanga

abstract: Ko te mauri te wāhanga wairua o te tangata e whakahihiri i te tinana me te tūhonohono nei i te wairua ki te kikokiko. Ko te mauri te wāhanga ora o te tangata, ā, i te roanga atu o te oranga o te tangata ka rerekē te tau o te mauri nā ngā awenga o tōna ao. Ko te Mauritau te wā e ita pai ana te wairua ki te kikokiko. Kua whai ngātahitanga ērā mea e rua. Kei tōna ito, ki te Mauritau te tangata, e wātea ana ia, kāhore ōna taumaha, ka mutu e tuwhera ana ia ki tōna ao. Ko tā Te Aho Matua, ka whakatō te mauri ki te tangata i te whakatōnga o te kākano ki te kōpū. Ko te Mauritau tētahi āhuatanga kāhore anō kia tino rangahau, ā, he iti noa ngā wā te kite atu ki te puna mātātuhi, heoi anō, ka rangona whānuitia ki Te Kura Kaupapa Māori o Hoani Waititi Marae. Ko tā tēnei kaupapa rangahau, ko te Mauritau tētahi o ngā puāwaitanga matua o Te Aho Matua, ā, kua taupuhipuhi nei ki ngā whakaaro o rātou i whai wāhi nei ki tēnei kaupapa rangahau. Ko te manako nui o tēnei kaupapa rangahau ko te whakawhānui i te mōhioranga mō ngā hua o ngā Kura Kaupapa Māori mā te ruku hōhonu ki te Mauritau i te whānau o Te Kura Kaupapa Māori o Hoani Waititi Marae.  

Kua whā tekau tau neke atu kua hipa mai i te orokotīmatanga o ngā Kura Kaupapa Māori, otirā, te Kura Kaupapa Māori o Hoani Waititi Marae. Ko te tino take o ngā Kura Kaupapa Māori ko te whakarauora reo me te whakarauora tikanga, heoi anō, he tini me te mano ngā angitutanga, ngā painga kua puta mai i ēnei kura tua atu i ēnei whāinga e rua. Ko Te Aho Matua te tūāpapa ā-mātāpono mō ngā Kura Kaupapa Māori e whakawhārikihia ngā uaratanga matua kia whakatutuki i ngā wawata nui, i ngā ōhākī nui ā kui mā, a koro mā mō te orangatonutanga o te reo Māori me ngā tikanga Māori. Ko tā tēnei kaupapa rangahau, ko te Mauritau tētahi āhuatanga i puāwai i ngā kura Aho Matua, ā, ka kitea rawatia tēnei puāwaitanga ki Te Kura Kaupapa Māori o Hoani Waititi. 

He Rangahau Kaupapa Māori tēnei, ā, i tārai i ngā tikanga me ngā tukanga o te kaupapa rangahau nei kia Māori te karawhiu. Ko Te Aho Matua me ōna uaratanga e tū hei pou whakawhirinaki i te Kaupapa Rangahau Māori. E rua ngā tukanga i whāia e te tuhikura nei, arā, ko te iāna me te puawānanga. Ko te iāna tētahi kupu mino nō Te Tai Tokerau mō te kōrero ōpaki, ā, kua iāna tahi ki ngā pakeke tokowhitu nō te whānau o Te Kura Kaupapa Māori o Hoani Waititi Marae. Ko te puawānanga he wānanga ki ngā ākonga tokowhitu o te reanga tuakana o te wharekura kia āta wherawhera i ngā āhuatanga o te Mauritau ki a rātou. I te whakaraupapatia ngā kōrero i puta mai i ngā iāna me te puawānanga mā ngā uaratanga o Te Aho Matua.

text: Ko ia tonu te rangatira o tana mauri: Ko te Mauritau hei tohu o te puāwaitanga o Te Aho Matua i te Kura Kaupapa Māori o Hoani Waititi Marae Ko te mauri te wāhanga wairua o te tangata e whakahihiri i te tinana me te tūhonohono nei i te wairua ki te kikokiko. Ko te mauri te wāhanga ora o te tangata, ā, i te roanga atu o te oranga o te tangata ka rerekē te tau o te mauri nā ngā awenga o tōna ao. Ko te Mauritau te wā e ita pai ana te wairua ki te kikokiko. Kua whai ngātahitanga ērā mea e rua. Kei tōna ito, ki te Mauritau te tangata, e wātea ana ia, kāhore ōna taumaha, ka mutu e tuwhera ana ia ki tōna ao. Ko tā Te Aho Matua, ka whakatō te mauri ki te tangata i te whakatōnga o te kākano ki te kōpū. Ko te Mauritau tētahi āhuatanga kāhore anō kia tino rangahau, ā, he iti noa ngā wā te kite atu ki te puna mātātuhi, heoi anō, ka rangona whānuitia ki Te Kura Kaupapa Māori o Hoani Waititi Marae. Ko tā tēnei kaupapa rangahau, ko te Mauritau tētahi o ngā puāwaitanga matua o Te Aho Matua, ā, kua taupuhipuhi nei ki ngā whakaaro o rātou i whai wāhi nei ki tēnei kaupapa rangahau. Ko te manako nui o tēnei kaupapa rangahau ko te whakawhānui i te mōhioranga mō ngā hua o ngā Kura Kaupapa Māori mā te ruku hōhonu ki te Mauritau i te whānau o Te Kura Kaupapa Māori o Hoani Waititi Marae.  

Kua whā tekau tau neke atu kua hipa mai i te orokotīmatanga o ngā Kura Kaupapa Māori, otirā, te Kura Kaupapa Māori o Hoani Waititi Marae. Ko te tino take o ngā Kura Kaupapa Māori ko te whakarauora reo me te whakarauora tikanga, heoi anō, he tini me te mano ngā angitutanga, ngā painga kua puta mai i ēnei kura tua atu i ēnei whāinga e rua. Ko Te Aho Matua te tūāpapa ā-mātāpono mō ngā Kura Kaupapa Māori e whakawhārikihia ngā uaratanga matua kia whakatutuki i ngā wawata nui, i ngā ōhākī nui ā kui mā, a koro mā mō te orangatonutanga o te reo Māori me ngā tikanga Māori. Ko tā tēnei kaupapa rangahau, ko te Mauritau tētahi āhuatanga i puāwai i ngā kura Aho Matua, ā, ka kitea rawatia tēnei puāwaitanga ki Te Kura Kaupapa Māori o Hoani Waititi. 

He Rangahau Kaupapa Māori tēnei, ā, i tārai i ngā tikanga me ngā tukanga o te kaupapa rangahau nei kia Māori te karawhiu. Ko Te Aho Matua me ōna uaratanga e tū hei pou whakawhirinaki i te Kaupapa Rangahau Māori. E rua ngā tukanga i whāia e te tuhikura nei, arā, ko te iāna me te puawānanga. Ko te iāna tētahi kupu mino nō Te Tai Tokerau mō te kōrero ōpaki, ā, kua iāna tahi ki ngā pakeke tokowhitu nō te whānau o Te Kura Kaupapa Māori o Hoani Waititi Marae. Ko te puawānanga he wānanga ki ngā ākonga tokowhitu o te reanga tuakana o te wharekura kia āta wherawhera i ngā āhuatanga o te Mauritau ki a rātou. I te whakaraupapatia ngā kōrero i puta mai i ngā iāna me te puawānanga mā ngā uaratanga o Te Aho Matua.

year: 2023