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Smallholder Farmers’ Willingness to Pay for Improved Cookstoves in Dedza, Malawi 马拉维德德扎小农购买改良炉灶的意愿
IF 0.6 Pub Date : 2017-05-17 DOI: 10.12691/AJRD-5-3-3
E. McNulty, Thea Nielsen, M. Zeller
As improved cookstove programs increase in popularity, policy makers need accurate estimates of their constituents’ willingness to pay for the stoves. Knowing which socioeconomic factors affect willingness to pay will allow program planners to price and target the stoves effectively. This study elicits the willingness to pay of 300 rural Malawians in Dedza District for two types of stove and explores the determinant socioeconomic factors. Respondents were willing to pay a median price of 7 USD for a clay stove and 9 USD for a rocket stove. In the clay stove regression model, willingness to pay is positively correlated with dietary diversity and negatively correlated with fuel expenditure. In the rocket stove regression model, willingness to pay is positively correlated with net household income and dietary diversity, and negatively correlated with higher incidence of cooking-related ailments. A literature review reveals that because of the discrepancy between short-term and long-term impacts of improved cookstove adoption, the focus of stove programs should be sustained, proper stove use by adopters, not just dissemination. Positive impact estimates are inflated when only short-term adoption data and laboratory fuel test results are used; more long-term impact evaluations are needed. Further, the study of socioeconomic determinants of stove adoption alone is inadequate for a self-sustaining, unsubsidized improved cookstove market. Choice elicitation experiment studies on product-specific attributes, that is stove characteristics, should complement socioeconomic findings to determine what is most desired by the target market.
随着改良炉灶项目越来越受欢迎,政策制定者需要准确估计选民购买炉灶的意愿。了解哪些社会经济因素会影响支付意愿,将使项目规划者能够有效地为炉灶定价并确定目标。本研究调查了300名马拉维农村居民购买两种炉子的意愿,并探讨了决定性的社会经济因素。受访者愿意为粘土炉支付7美元的中位数价格,为火箭炉支付9美元的中位数价格。在泥炉回归模型中,支付意愿与膳食多样性正相关,与燃料消耗负相关。在火箭炉回归模型中,支付意愿与家庭净收入和饮食多样性正相关,与烹饪相关疾病的高发病率负相关。一项文献综述表明,由于改进炉灶采用的短期和长期影响之间的差异,炉灶项目的重点应该是持续的,采用者正确使用炉子,而不仅仅是传播。如果只使用短期采用数据和实验室燃料测试结果,则夸大了积极影响估计;需要进行更多的长期影响评价。此外,仅研究炉子采用的社会经济决定因素对于自我维持,无补贴的改进炉灶市场是不够的。关于产品特定属性的选择启发实验研究,即炉子特性,应该补充社会经济研究结果,以确定目标市场最需要的是什么。
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引用次数: 2
Land Governance and Conflict Management in Tanzania: Institutional Capacity and Policy-Legal Framework Challenges 坦桑尼亚的土地治理和冲突管理:机构能力和政策-法律框架挑战
IF 0.6 Pub Date : 2017-04-18 DOI: 10.12691/AJRD-5-2-3
P. John, S. Kabote
This paper examines land governance in the Southern Agricultural Growth Corridor in Rukwa and Katavi regions in Tanzania. The four districts involved include Sumbawanga, Kalambo, Nkasi and Mpanda. Land governance and the management of related conflicts were assessed in views of the roles of local government and the challenges posed by policy and legal frameworks. Using a sample size of 270 smallholder farmers, a household survey was used to collect quantitative data, while qualitative data were collected from 74 Focus Group Discussions’ participants. The results confirmed the ‘legal dualism’ that embraces colonial policy and laws on land issues at local level despite the land reforms that have had taken place in Tanzania. In addition, land conflict was a common phenomenon. The results also show that the efforts of local governments, and other stakeholders, to manage land conflicts were hampered by serious challenges. The challenges include incapacitation of the local government with regard to legal issues, lack of education and unawareness of the policies and legal framework on the part of the citizenry. These resulted into ineffective implementation of informal and formal arrangements governing land issues. Ineffective land governance, in turn, stem from inadequate capacity to resolve land conflicts. This justifies poor land governance. To that effect, concerted efforts are needed to correct the situation.
本文考察了坦桑尼亚Rukwa和Katavi地区南部农业增长走廊的土地治理。涉及的四个县包括松巴旺加、卡兰博、恩卡西和潘达。根据地方政府的作用以及政策和法律框架带来的挑战,评估了土地治理和相关冲突的管理。本研究以270名小农为样本,采用入户调查收集定量数据,同时从74名焦点小组讨论参与者中收集定性数据。调查结果证实了“法律二元论”,尽管坦桑尼亚已经进行了土地改革,但这种法律二元论在地方一级支持关于土地问题的殖民政策和法律。此外,土地冲突也是一种普遍现象。研究结果还表明,地方政府和其他利益相关者管理土地冲突的努力受到严重挑战的阻碍。挑战包括地方政府在法律问题上的无能,缺乏教育和对公民的政策和法律框架的不了解。这导致有关土地问题的非正式和正式安排没有得到有效执行。而无效的土地治理则源于解决土地冲突的能力不足。这证明了土地管理不善。为此,需要作出协调一致的努力来纠正这种情况。
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引用次数: 12
Perceived Access to Water: Associations with Health in Rural Uganda 感知获得水的机会:与乌干达农村健康的关系
IF 0.6 Pub Date : 2017-04-12 DOI: 10.12691/AJRD-5-3-1
A. Pearson, Amanda Rzotkiewicz, Judith Namanya
Water security has been associated with myriad health concerns. However, measures of access to water vary and may not reflect reality or user priorities, affecting our understanding of the effect of water security on health. This study aimed to: 1) examine relationships between established measures and perceived access to water; and 2) compare the ability of established measures versus a perceived measure to predict health outcomes. Data collection included baseline anthropometrics, bi-monthly morbidity histories, and a final survey over a four-month period among 100 households in Uganda’s rural, semi-arid savannah. Hierarchical regression models were fitted to test relationships. Despite low water security, 68% of participants did not report illness. Perceptions of better access was significantly associated with fewer minutes walking to source and, surprisingly, with fewer litres collected yesterday/person. Perceived better access (β=-0.09, p<0.10) and more public ownership (β =-0.09, p<0.10) were associated with lower percentage time ill. Both effects were small. Understanding of the drivers of perceived water access may provide useful insights into social dimensions of water security, which may influence health.
水安全一直与无数健康问题联系在一起。然而,获取水的措施各不相同,可能无法反映现实或用户的优先事项,从而影响我们对水安全对健康影响的理解。本研究旨在:1)检验既定措施与感知水资源获取之间的关系;2)比较既定措施与感知措施预测健康结果的能力。数据收集包括基线人体测量、双月发病史,以及对乌干达农村半干旱大草原100户家庭进行的为期4个月的最终调查。采用层次回归模型检验关系。尽管水安全水平较低,但68%的参与者没有报告生病。更方便的交通方式与更少的步行时间显著相关,令人惊讶的是,昨天每个人收集的升水也更少。感知到更好的访问(β=-0.09, p<0.10)和更多的公共所有权(β=-0.09, p<0.10)与较低的患病时间百分比相关。这两种影响都很小。了解感知水获取的驱动因素,可以对可能影响健康的水安全的社会层面提供有用的见解。
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引用次数: 3
Land Consolidation for Sub-Saharan Africa’s Customary Lands: The Need for Responsible Approaches 撒哈拉以南非洲习惯土地的土地整理:需要负责任的方法
IF 0.6 Pub Date : 2017-03-28 DOI: 10.12691/AJRD-5-2-2
K. Asiama, R. Bennett, J. Zevenbergen
This paper explores the potential of land consolidation for dealing with land fragmentation in Sub-Saharan Africa’s (SSA) rural customary lands – where the intention is to increase food productivity. In SSA’s customary lands, the use of mechanized farming technology and intensive farming techniques have largely failed to increase food productivity. This is despite foreign investment and the interest of the farmers to do so. In many cases, neither the farm parcel structure nor the land tenure arrangements support the use of, or investment in, mechanized equipment. This implies a strong need to deal with the land fragmentation situation. Although land consolidation is argued as an effective response to land fragmentation; its application in SSA’s customary lands has either not been successful, or it has ended up breaking down the customary land tenure arrangements. We argue that past attempts at land consolidation in SSA’s customary lands have failed mainly due to the transfer of European strategies without adequate consideration for the local factors in the planning and implementation, as well as inadequate land information. Land consolidation strategies in Europe have shown that responsible approaches continually considered the changing local factors. There has been a recent push for more responsible approaches to land reform and planning activities that consider social, cultural, and economic factors that were previously not considered. In this paper, the nature and causes of land fragmentation in customary lands will first be explored, then current approaches seeking to increase farm productivity are reviewed. Analysing the problems of land fragmentation in customary lands, the failure to adapt land consolidation approaches in customary lands in the past, and the potential of participatory land administration as an enabling tool, we conclude that responsible approaches are an important component of increasing food productivity in sub-Saharan Africa.
本文探讨了在撒哈拉以南非洲(SSA)的农村习惯土地上,土地整理处理土地破碎化的潜力——其目的是提高粮食生产率。在SSA的习惯土地上,机械化耕作技术和集约化耕作技术的使用在很大程度上未能提高粮食生产率。这是不顾外国投资和农民利益这样做的。在许多情况下,农场的小块结构和土地所有权安排都不支持机械化设备的使用或投资。这意味着迫切需要处理土地支离破碎的情况。虽然土地整理被认为是对土地破碎化的有效回应;它在特别行政区的习惯土地上的应用要么不成功,要么最终破坏了习惯的土地使用权安排。我们认为,过去在SSA习惯土地上进行土地整理的尝试失败的主要原因是欧洲战略的转移,在规划和实施中没有充分考虑当地因素,以及土地信息不足。欧洲的土地整理战略表明,负责任的方法不断考虑到不断变化的当地因素。最近一直在推动对土地改革和规划活动采取更负责任的办法,考虑到以前没有考虑到的社会、文化和经济因素。本文将首先探讨习惯土地破碎化的性质和原因,然后回顾目前寻求提高农业生产力的方法。通过分析习惯土地的土地破碎化问题、过去习惯土地采用土地整理方法的失败,以及参与式土地管理作为一种有利工具的潜力,我们得出结论,负责任的方法是提高撒哈拉以南非洲粮食生产力的重要组成部分。
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引用次数: 24
Projected impact of climate change on rice yield in two agro-ecological zones in South- Kivu, Democratic Republic of Congo 气候变化对刚果民主共和国南基伍省两个农业生态区水稻产量的预测影响
IF 0.6 Pub Date : 2017-03-24 DOI: 10.22004/ag.econ.263431
Daniel Muhindo Iragi, J. M. Mwanjalolo, Alice Amonding Katushabe, Jean Walangululu Masamba, Bossissi Nkuba
Rice (Oryza sativa) is one of the five most important staple foods in South-Kivu, with high and increasing demand. The gap between the demand and supply has led to increased importation of rice in the region. Changes in climate are likely to further worsen this gap. This study determined the impact of future climate on paddy rice yield in high altitude plateau and semi-arid Lowland plain of South Kivu region. The Agricultural Production Systems Simulator Model (APSIM) was used to simulate the impact of climate change scenarios -two periods: Mid and end-century, and for two Representative Concentration Pathways: 4.5 and 8.5- on rice yield. Based on the APSIM, rice grain yield is projected to increase with climate change in high altitude plateau while in the semi-arid lowland plain a slight increase in grain yield followed by a decline is projected in the end-century under RCP 8.5. These findings have potential to compliment rice farmers increase their coping capacity against climate change especially in semi-arid lowland plain where negative impacts are projected.
水稻(Oryza sativa)是南基伍省五种最重要的主食之一,需求量很高,而且还在不断增加。供需之间的缺口导致该地区大米进口增加。气候变化可能会进一步加剧这一差距。本研究确定了未来气候对南基伍地区高海拔高原和半干旱低地平原水稻产量的影响。利用农业生产系统模拟模型(APSIM)模拟了气候变化情景(本世纪中叶和世纪末两个时期)以及两个代表性浓度路径(4.5和8.5)对水稻产量的影响。基于APSIM,在rcp8.5条件下,预测高海拔高原水稻产量随气候变化而增加,而半干旱低地平原水稻产量在本世纪末略有增加后下降。这些发现有可能帮助稻农提高应对气候变化的能力,特别是在预计会产生负面影响的半干旱低地平原。
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引用次数: 6
Facilitating transformative learning for community development: Experiences from Zimbabwe 促进社区发展的变革学习:来自津巴布韦的经验
IF 0.6 Pub Date : 2017-03-24 DOI: 10.22004/AG.ECON.263428
Tirivanhu Precious
This paper asserts problematic frames of reference among community members and the breakdown in community wide dialogue as key contributing factors towards the slow pace in rural development and social change. The frames of reference are considered problematic partly because they influence community members to view development programmes negatively. It is argued that transformative learning through dialogue enhances sustainable social change. The praxis for facilitating community wide transformational learning was explored using a mixed methods research methodology with the Mhakwe Comprehensive Community Initiative in Zimbabwe as a case study. Qualitative data were collected from action research, focus group discussions and key informant interviews. Quantitative data were collected using a structured questionnaire following a multi stage stratified sampling procedure (n=65). Based on the findings, key enablers for transformative learning include: addressing community polarity; creating communicative space; refining Frames of Reference; and developing dialogue infrastructure. Transformative learning was found to be enhanced through creating positive energy and leveraging indigenous knowledge. The study concludes that development institutions need to embrace transformative learning as a strategy for sustainable social change.
本文认为,社区成员之间存在问题的参考框架和社区范围内对话的破裂是导致农村发展和社会变革步伐缓慢的关键因素。参考框架被认为有问题,部分原因是它们影响社区成员消极地看待发展方案。有人认为,通过对话进行的变革性学习可以促进可持续的社会变革。本文以津巴布韦的Mhakwe综合社区倡议为例,采用混合方法研究方法,探讨了促进全社区转型学习的实践。定性数据收集自行动研究、焦点小组讨论和关键线人访谈。定量数据的收集采用结构化问卷,采用多阶段分层抽样程序(n=65)。根据调查结果,促进变革学习的关键因素包括:解决社区极性问题;创造交流空间;完善参照系;发展对话基础设施。研究发现,通过创造正能量和利用本土知识,可以促进变革学习。该研究的结论是,发展机构需要将变革性学习作为可持续社会变革的战略。
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引用次数: 1
Collateral Pledge: Does Relationship Lending Matters? The Case of Maize Farmers in Ghana 抵押品质押:关系借贷重要吗?加纳玉米种植户的案例
IF 0.6 Pub Date : 2017-03-20 DOI: 10.12691/AJRD-5-2-1
Stephen Antwi, Kwasi Ohene-Yankyira
A survey was employed to gather the primary data needed to assess how relationship lending affect the collateral that must be pledged by the maize farmer borrowers when taking credit from financial institutions. The farmers were selected from 8 districts in Ashanti and Brong Ahafo regions of Ghana. Multi-stage purposive and randomized sampling technique was used to sample 380 maize farmers. Descriptive statistics were used to evaluate collateral and socio-economic characteristics of the respondents while logit regression analysis was used to measure the effects of relationship lending on collateral used to secure loans taken by maize farmers. The results revealed farmer’s access to information has a reverse and significant with the collateral used to secure loans .multiple banking relationships is significant and directly related to the collateral used by farmers. The previous loan repayment behavior inversely affects the collateral pledge and is significant. Farmers who have investments with the bank are able to argue for lower or no collateral since those investments are used as securities. This explains the negative relationship with the collateral pledge. Thus farmers are encouraged to build more relationship with their banks in the form of investments, good repayments, getting more information minimizing the number of banks they deal with.
一项调查用于收集评估关系贷款如何影响玉米农民借款人在从金融机构获得信贷时必须质押的抵押品所需的主要数据。这些农民是从加纳阿散蒂和布隆阿哈福地区的8个县选出的。采用多阶段有目的随机抽样技术对380名玉米农户进行抽样。描述性统计用于评估抵押品和受访者的社会经济特征,而logit回归分析用于衡量关系贷款对用于保证玉米农民贷款的抵押品的影响。结果显示,农民获取信息的渠道与用于担保贷款的抵押品呈反向显著关系,多重银行关系显著且直接与农民使用的抵押品相关。以往的还贷行为对抵押品质押产生负向影响,且显著。在银行有投资的农民可以要求较低的抵押品或没有抵押品,因为这些投资被用作证券。这就解释了与抵押品的负相关关系。因此,鼓励农民以投资、良好还款、获取更多信息的形式与银行建立更多关系,最大限度地减少他们与银行打交道的数量。
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引用次数: 0
Participatory Variety Selection for enhanced promotion and adoption of improved finger millet varieties: A case for Singida and Iramba Districts in Central Tanzania. 参与式品种选择以加强推广和采用改良的指谷子品种:以坦桑尼亚中部Singida和Iramba地区为例
IF 0.6 Pub Date : 2017-03-11 DOI: 10.22004/AG.ECON.263302
Fred Ojulong Henry, Leta Elias, Sakwera Loveness, Ziwa Rukwa, M. Frida, S. Patrick, Kibuka Joseph, Otwani Daniel, A. Patrick, M. Mary, Manyasa Emmanuel
Participatory variety selection (PVS) is an approach which provides a wide choice of varieties to farmers to evaluate in their own environment using their own resources for increasing production. It enhances farmer’s access to diverse crop varieties, increases production and ensures food security and helps faster dissemination and adoption of pre and released varieties. It allows varietal selection in targeted areas at cost-effective and timely manner and helps promotion of community seed production and community seed banks. Therefore, a variety developed through PVS usually meets demand of different stakeholders. Farmers in Singida and Iramba districts in central Tanzania were found to be growing land races which were low yielding, long maturing, drought and disease susceptible, as no variety had previously been released in Tanzania. Through PVS a broader choice of varieties that matched farmer needs in adaptation and quality traits was offered for evaluation. As such PVS was used to introduce, evaluate, release and promote for adoption finger millet varieties in Central and Northern Tanzania. Farmers selected and adopted new varieties of a higher utility (a combination of improved agronomic traits, higher yield, and improved quality). Through PVS Tanzania released her first finger millet varieties (U15 and P224). Adoption of the varieties was very high as farmers associated with the varieties; and affordable high quality seed was made available as Quality Declared Seed (QDS) produced by the target farmer groups. Preferred traits differed between the gender groups; women preferred risk averting traits like short duration, drought tolerance, compact heads and disease resistance while male preferred market related traits (high yield, brown colour and big head.
参与式品种选择(PVS)是一种为农民提供广泛的品种选择,让他们在自己的环境中利用自己的资源进行评估,以提高产量的方法。它增加了农民获得多样化作物品种的机会,提高了产量,确保了粮食安全,并有助于更快地传播和采用预发布和发布的品种。它可以在有针对性的地区以具有成本效益和及时的方式进行品种选择,并有助于促进社区种子生产和社区种子库。因此,通过pv开发的品种通常可以满足不同利益相关者的需求。发现坦桑尼亚中部Singida和Iramba地区的农民正在种植产量低、成熟时间长、易受干旱和疾病影响的陆地品种,因为坦桑尼亚以前没有释放过任何品种。通过PVS,提供了更广泛的品种选择,以满足农民在适应性和质量性状方面的需求。因此,利用PVS在坦桑尼亚中北部地区进行了指谷子品种的引种、评价、发布和推广。农民选择和采用了更高效用的新品种(改良的农艺性状、更高的产量和更好的质量的组合)。通过PVS,坦桑尼亚发布了她的第一批谷子品种(U15和P224)。这些品种的采用率很高,因为农民与这些品种有联系;通过目标农民群体生产的质量申报种子(QDS)提供价格合理的优质种子。不同性别群体的偏好特征不同;女性更喜欢短持续时间、耐旱、紧凑的头部和抗病性等规避风险的性状,而男性更喜欢与市场相关的性状(高产、棕色和大头部)。
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引用次数: 9
Improving the capacity of Agricultural Higher Education Institutions to contribute to food security: the iAGRI experience and lessons learned 提高农业高等教育机构促进粮食安全的能力:iAGRI的经验和教训
IF 0.6 Pub Date : 2017-03-11 DOI: 10.22004/AG.ECON.263295
K. David, E. Mark, Minde Isaac, H. David
The Innovative Agricultural Research Initiative (iAGRI) is a long-term investment in agricultural higher education and research capacity in Tanzania funded by U.S. Agency for International Development (USAID) and led by The Ohio State University in conjunction with five other U.S. land grant universities and the Regional Universities Forum for Capacity Building in Agriculture (RUFORUM). Although University contributions to sustainable agricultural development in sub-Saharan Africa have been well documented, for the past several decades, donors and national governments have neglected agricultural higher education institutions. The main goal of the iAGRI project is to improve food security and agricultural productivity in Tanzania by strengthening the training and collaborative research capacities of Sokoine University of Agriculture (SUA) and the Ministry of Agriculture, Livestock and Fisheries (MALF) and has four major objectives:1) implementing a program of collaborative agriculture research with SUA and MALF; 2) providing advanced degree training in agriculture for Tanzanian graduate students; 3) strengthening the capacity of SUA to develop and implement instructional, research and outreach programs; and 4) promoting cooperation between SUA, U.S. universities, and global south universities. The paper summarizes outcomes of the degree training, collaborative research and institutional strengthening efforts and innovative approaches to institutional capacity development (ICD). iAGRI granted scholarships to 139 Tanzanians to pursue graduate degrees in the agricultural sciences, with half studying at U.S. universities and half studying at RUFORUM affiliated universities in Africa and India. Nearly half of the candidates were women. Although human capacity development (HCD) is important, it is not a substitute for ICD. Approaches used to promote ICD are discussed including improved planning processes, organizational experiments, and promotion of innovations and linkages to the private sector.
创新农业研究计划(iAGRI)是一项对坦桑尼亚农业高等教育和研究能力的长期投资,由美国国际开发署(USAID)资助,由俄亥俄州立大学与其他五所美国赠地大学和地区大学农业能力建设论坛(RUFORUM)共同领导。尽管大学对撒哈拉以南非洲地区可持续农业发展的贡献有据可查,但在过去几十年里,捐助者和国家政府忽视了农业高等教育机构。iAGRI项目的主要目标是通过加强索科因农业大学(SUA)和农业、畜牧业和渔业部(MALF)的培训和合作研究能力来改善坦桑尼亚的粮食安全和农业生产力,该项目有四个主要目标:1)实施与索科因农业大学和MALF的农业合作研究计划;2)为坦桑尼亚研究生提供农业高级学位培训;3)加强学校制定和实施教学、研究和外展计划的能力;(4)促进我校与美国高校及全球南方高校的合作。本文总结了学位培训、合作研究和机构加强工作以及机构能力发展(ICD)创新方法的成果。iAGRI向139名坦桑尼亚人提供了攻读农业科学研究生学位的奖学金,其中一半在美国大学学习,一半在非洲和印度的联合论坛附属大学学习。近一半的候选人是女性。虽然人的能力发展(HCD)很重要,但它不能代替ICD。讨论了用于促进ICD的方法,包括改进规划程序、组织试验、促进创新和与私营部门的联系。
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引用次数: 0
Characterising wetland hydrology and water quality in streams and wetlands of Khalong-la-Lithunya, Lesotho 莱索托Khalong-la-Lithunya河流和湿地的水文和水质特征
IF 0.6 Pub Date : 2017-03-11 DOI: 10.22004/AG.ECON.263402
Mots’ets’e Motseko, Esther Mapeshoane Botle, Masopha Makoae, M. Khoeli, N. Tumelo, Mokhatla Mohlamatsane, Gerard Rasekoele Motlalepula
Wetland hydrology is important in understanding wetland systems, evaluating wetland functions and processes and assessing wetland conditions. Wetlands assimilate and transform pollutants and nutrients ensuring that quality water is discharged from the wetland into streams. The objective of this study was to characterise wetland hydrology and evaluate the water quality so as to determine the ecological functioning of the Khalong-la-Lithunya wetland. Wetland hydrology and water quality of the three sub-catchments were monitored from October 2015 to March 2016. Water levels in piezometers were recorded once a month and monthly water levels data for the years 2010, 2011, 2012 and 2013 previously recorded by the Millennium Challenge Account-Lesotho (MCA-L) project were integrated to this study’s data. Rainfall, piezometer and stream water were similarly obtained once every month. These were analysed for δ2H and δ18O water stable isotopes and water quality parameters determined. The estimated overall hydro-period of Khalong-la-Lithunya from the years 2010 to 2016 was 11.4% of the sampled time. The wetland showed delayed response of piezometer water levels to rainfall and additional source of water to the wetland through sub-surface flow. The isotopic composition of piezometer and stream water showed that the water gets stored in the wetland before being discharged to the stream leading to a positive interaction between ground and surface water. Most water quality parameters (Na, pH, Mg, PO4 , COD, BOD, NO3, K, Ca, EC) were higher in streams than in piezometers and were mostly within WHO permissible limits. There was a poorer water quality index in streams (59.71) when compared to that of piezometers (53.67). The principal component analysis (PCA) indicated that the parameters that were responsible for the variation in water quality were related to natural hydro-chemical processes, anthropogenic factors and geology and soil constituents. Temporally most parameters were highest during dry months. Due to a short hydro-period, a delayed interaction between surface and ground water and a poorer stream water quality index, it is concluded that the wetland was not in a good condition. Thus, it is not adequately performing its ecological function.
湿地水文学对认识湿地系统、评价湿地功能和过程、评价湿地状况具有重要意义。湿地吸收和转化污染物和营养物质,确保优质水从湿地排入溪流。本研究的目的是描述湿地的水文特征和评价水质,以确定卡龙-拉-利屯雅湿地的生态功能。在2015年10月至2016年3月期间,对三个小流域的湿地水文和水质进行了监测。压计中的水位每月记录一次,此前千年挑战账户-莱索托(MCA-L)项目记录的2010年、2011年、2012年和2013年的月度水位数据被整合到本研究的数据中。雨量、气压计和溪水也同样是每月一次。分析了这些水的δ2H和δ18O稳定同位素,并确定了水质参数。从2010年到2016年,Khalong-la-Lithunya的总体水力周期估计为采样时间的11.4%。该湿地的水位对降雨和通过地下流向湿地提供的额外水源的响应具有延迟性。地表水和地表水的同位素组成表明,水先储存在湿地中,再排入河流,导致地下水和地表水之间的正相互作用。大多数水质参数(Na、pH、Mg、PO4、COD、BOD、NO3、K、Ca、EC)在溪流中高于气压计,且大多在WHO允许的范围内。河流水质指数(59.71)低于气压计(53.67)。主成分分析(PCA)表明,影响水质变化的参数与自然水化学过程、人为因素、地质和土壤成分有关。从时间上看,大部分参数在干旱月份最高。由于水文周期短,地表水与地下水相互作用滞后,河流水质指标较差,湿地状况不佳。因此,它没有充分发挥其生态功能。
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引用次数: 2
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Journal of Rural and Community Development
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