Recent Submissions

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    A pressure-state-response framework for the sustainability analysis of water national parks in China
    (Elsevier B.V., 2021-11) Li, W; Qi, J; Huang, S; Fu, W; Zhong, L; He, B-J
    Water National Parks (WNPs) have been launched by the Ministry of Water Resources of China (MWR) to develop tourism functions for water conservancy projects since 2001. Although WNPs can provide socio-economic benefits, their tourism activities may overload environmental carrying capacity. This study developed a sustainability analysis framework to measure the impact of tourism holistically and explore the challenges inherent in the sustainable development of WNPs. The framework, based on the Pressure-State-Response model, consists of four components: characterisation of WNPs; pressure, state, and response assessment; calculation of a sustainability score; and sustainability analysis of WNPs. To demonstrate the usability of the framework, this study first collected data on 778 WNPs from the MWR in order to characterise WNPs in China, followed by selecting 83 WNPs as examples for a detailed sustainability assessment. The results show that the framework enables: (1) the sustainability analysis of WNPs based on temporal trends, spatial distribution, and types of WNP; and (2) sustainable development challenges to be identified such as the tendency to increase waste discharges and energy consumption. The framework provides a strategic approach for the sustainability analysis, assisting WNPs and other water conservancy projects to achieve sustainable development goals.
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    Migration of nanocolloid-carrying antibiotics in paddy red soil during the organic fertilization process
    (Elsevier, 2024-01-15) Jiang, Y; Zhang, Y; Liang, Y; Liu, W; Wang, Y; Yang, J; Qiu, R; Di, Hong; A, D
    Soil nanocolloids are highly mobile and can act as carriers for the transport of antibiotics to a wider and deeper range of soils; however, the inherent behavior and mechanism of nanocolloid-carrying antibiotics in soil remain unclear. In this study, we conducted a comprehensive investigation of the migration of antibiotics in paddy red soil during the organic fertilization process using four common soil nanocolloids: kaolin (KL), montmorillonite (MT), hematite (HT), and humic acid (HA). The results showed that nanocolloid carriers promoted the intra-medium (from soil surface to the bottom) and inter-medium transfer (from organic fertilizers to soil) of antibiotics. The migration mechanisms of antibiotics carried by the nanocolloids differed: the phenolic hydroxyl and carboxyl groups of HA esterified with the carboxyl groups of quinolones and phenolic hydroxyl groups of tetracyclines, respectively, while the oxygen atoms of HT formed stabilizing complexes with the soil, which could further adsorb antibiotics using their functional group-rich complexes. Smaller antibiotic compounds were adsorbed in the metal oxide interlayer of MT via cation exchange, whereas KL adsorbed antibiotics on its metal oxide surface layer in the same way but were susceptible to desorption. Additionally, nanocolloids changed the adsorption capacity of soil for antibiotics and influenced the enrichment of dominant/functional bacteria (e.g., Burkholderiaceae) and thus varied the vertical distribution of antibiotics in soil. These findings enhance our understanding of the migration behavior and mechanism of nanocolloid-carrying antibiotics in red paddy soil and provide a theoretical foundation for preventing and controlling antibiotic pollution in arable systems.
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    Horticultural management - Critical Path Method
    (Lincoln College, University College of Agriculture, 1982) Stevens, R.B.
    The CPM family of planning techniques are a potent tool in the organisation and control of work programmes. Techniques such as these are no panacea: problems in t.he collection of data, the setting of subobjectives and in the implementation of the work plan are recurring decisions to be taken by management otherwise the benefits of the formalised expression of the work plan will be negated. The use of CPM in horticulture has, to date, been limited to a few construction, crop scheduling and planting programmes. However, as the maintenance and development operations of local authority parks departments in particular, become constrained by the availability of finance, greater emphasis will be placed on the optimum utilisation of resources and associated financial control. For determining project resource requirements, for constructing the resource use plan and for assessing the project cost with regard to quantifiable contingencies, the critical path methods have, at present, no equal.
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    In vitro absorption of selenium into ovine intestinal mucosa
    (Lincoln College, Canterbury, New Zealand, 1988) Savage, G.P.; Park, C.R.
    Selenium supplementation of ruminants is a standard management practice in New Zealand, especially in the central pumice area of the North Island, and most of the arable land of the South Island where low soil selenium leads to a number of nutritionally based deficiency diseases.
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    Effect of selenium prills on pasture herbage selenium concentrations
    (Lincoln College, Canterbury, New Zealand, 1988) McLenaghen, R.D.; McLaren, R.G.; Swift, R.S.
    Traditionally, selenium drenches or injections have been used to prevent the occurrence of selenium responsive diseases in livestock. However, the use of selenium containing fertilisers to enhance pasture herbage selenium concentrations, and thus prevent selenium deficiency, has also been examined (Allaway et al. 1966; Cary et al. 1967; Grant, 1965). The rapid uptake of fertiliser selenium by herbage and its potentially toxic effects, has lead some workers to conclude that pasture topdressing is not a very suitable method of maintaining the selenium status of grazing livestock (Underwood, 1977; Archer, 1983; Oldfield, 1972). In New Zealand however, since 1982, topdressing pastures with selenate has been permitted using pellets containing not more than 10 g/kg of selenium as sodium selenate, for application at a rate not exceeding 1.0 kg of pellets per hectare (Watkinson, 1983). The present paper reports results from pot and field experiments aimed at evaluating the use of SelcoteR Selenium Prills as a means of enhancing plant selenium levels.