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Impact of Water Management on Methane and Nitrous Oxide Emission Dynamics in Asian Paddy Ecosystems 水管理对亚洲水稻生态系统甲烷和氧化亚氮排放动态的影响
Pub Date : 2024-08-09 DOI: 10.30852/sb.2024.2565
T. C. Chamindu Deepagoda, M. Lakshani, Sarath Nissanka, Sujithra Kaushaliya Weragoda, D. M. J. Senanayake, G. S. Babu, Hoysala N. Chanakya, Shoichiro Hamamoto, Bjoern Ole Sander, Timothy J. Clough, B. Elberling, Kathleen Smits, Kahwaththa Gamage Inoka Damayanthi Kumari
With increasing demand for rice productivity linked with intense pressure on water availability in Asia, novel strategies are sought to optimise water management in paddy cultivation without compromising the yield. The conventional submerged paddy ecosystems not only consume water excessively but also constitute a major source of methane (CH4) and nitrous oxide (N2O), two highly potent greenhouse gases (GHG). The main objective of this study is to investigate the alternate wetting and draining (AWD) method as an emerging water-saving strategy for Asian countries, which could potentially minimise GHG emissions while maintaining crop productivity. Seasonal CH4 and N2O emissions from Sri Lankan and Indian experimental sites under the AWD method were compared with emissions from the conventional completely flooded (CF) method, while Japanese experimental sites were used to examine CH4 ebullition under CF conditions. Emission measurements were conducted in both wet and dry seasons with no alterations to country-specific applications of fertiliser and soil amendments. Overall results revealed that AWD could potentially suppress CH4 emissions by 32 to 43% without a significant statistical contrast (p > 0.05) in the crop yield. Measurements in Japan revealed that ebullition accounted for 60% of the total methane emissions at the heading stage under CF conditions. Results further emphasise the use of agricultural amendments with caution in paddy cultivation as they may lead to enhanced methane emissions.
随着亚洲地区对水稻产量的需求不断增加,同时对水资源的供应也造成了巨大压力,因此人们寻求新的战略,在不影响产量的前提下优化水稻种植中的水资源管理。传统的淹没式水稻生态系统不仅耗水量大,而且是甲烷(CH4)和一氧化二氮(N2O)这两种强效温室气体(GHG)的主要来源。本研究的主要目的是调查亚洲国家新兴的节水策略--交替润湿排水法(AWD),该方法有可能在保持作物产量的同时最大限度地减少温室气体排放。研究人员将斯里兰卡和印度实验点在交替润湿排水法下的甲烷(CH4)和一氧化二氮(N2O)季节排放量与传统的完全淹没(CF)法下的排放量进行了比较,并利用日本实验点研究了CF条件下的甲烷逸出情况。在湿季和旱季都进行了排放测量,没有改变各国的肥料和土壤改良剂施用量。总体结果显示,在作物产量没有显著统计对比(p > 0.05)的情况下,AWD 有可能抑制 32% 至 43% 的 CH4 排放。日本的测量结果显示,在 CF 条件下,胀气占茎秆期甲烷排放总量的 60%。研究结果进一步强调,在水稻种植中应谨慎使用农业添加剂,因为它们可能会导致甲烷排放增加。
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引用次数: 0
Impact of climate change, climate variability and adaptation in the coastal area of Cambodia 柬埔寨沿海地区气候变化、气候多变性和适应的影响
Pub Date : 2023-12-15 DOI: 10.30852/sb.2023.2435
Dara Sum, Sopheak Thav
Cambodia's coastal zones are highly dependent on climate and weather,making them susceptible to climate change and causing farmers’ livelihoods to bemore vulnerable compared to urban residents. Since climate issues already impactthe agricultural sector in Cambodia, this paper aims to assess the impact ofdisasters in the context of climate change, which impacts household agriculturalproduction, and to identify the existing community's capacity to respond and adaptto climate change and climate variability in the coastal zones of Cambodia. Asurvey was conducted in the agricultural coastal zone provinces of Cambodia. Datawas analysed using SPSS software. The survey data demonstrates that disastersand climate change, particularly drought and floods, significantly impact theeconomic status of the interviewed households. The proportion of householdsexperiencing disasters and climate change impacts has increased gradually.Regarding household capacity to respond and adapt to disasters and climatechange, households in the target area mainly focused on resilient farmingtechniques for rice crop production rather than other farming activities, and most ofthe practices were targeted to adaptation in the occurrence of droughts. The issueof receiving Early Warning Signs (EWS) information was addressed and 37% ofthe respondents reported “no source of climate information”. Therefore, it isrecommended to strengthen the capacity of local people in the coastal areas ofCambodia in responding to climate change.
柬埔寨的沿海地区高度依赖气候和天气,因此很容易受到气候变化的影响,与城市居民相比,农民的生计更加脆弱。由于气候问题已经影响到柬埔寨的农业部门,本文旨在评估在气候变化背景下灾害对家庭农业生产的影响,并确定柬埔寨沿海地区现有社区应对和适应气候变化和气候多变性的能力。在柬埔寨沿海农业区各省进行了调查。使用 SPSS 软件对数据进行了分析。调查数据表明,灾害和气候变化,尤其是干旱和洪水,严重影响了受访家庭的经济状况。在家庭应对和适应灾害和气候变化的能力方面,目标地区的家庭主要关注水稻作物生产的抗灾农作技术,而非其他农作活动,大多数做法都是为了适应干旱的发生。有 37% 的受访者表示 "没有气候信息来源"。因此,建议加强柬埔寨沿海地区当地人应对气候变化的能力。
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引用次数: 0
A case study on regional arsenic sources and its distribution in Mekong River groundwater 关于湄公河地下水中区域砷来源及其分布的案例研究
Pub Date : 2023-12-01 DOI: 10.30852/sb.2023.2372
Kah Yee Seah, Thipphachanh Souliyavong, Bounphak Lorbriayao, K. Phan, Kyoung-Woong Kim
Arsenic contamination in the Mekong River is a well-known environmental issue yet to be resolved due to its transboundary nature which further limits its access and data collection. Other than that, the key mechanisms that controlling the arsenic release in Mekong sub-region groundwater was heterogeneously distributed and can be varied from region to region. The main purpose of this project is to identify the regional arsenic contamination levels in the hope of helping the government integrate regional groundwater arsenic risk reduction policy in their near future planning. Sampling was conducted during May and August 2022 in Cambodia and Laos, respectively. The findings revealed that the topography of certain areas in Cambodia has exposed significantly high concentrations of arsenic in groundwater compared to those in Laos. About 33% of the sampling sites in Cambodia had shown a high arsenic contamination (> 10 µg/L, WHO guideline) with its concentration ranging from 47.7 ± 0.8 to 696.9 ± 5.6 ppb. The physicochemical properties revealed that the arsenic controlling mechanisms were totally different between both study area. More regional and site-specific arsenic contamination research related to climate change and arsenic hydrology at regional levels should be carried out to ensure the water safety plan in specific regions. Further, we believe that the findings of this study will be beneficial to policy and regional water safety plans for the Mekong River, especially in Cambodia.
湄公河的砷污染是一个众所周知的环境问题,但由于其跨境性质,这进一步限制了其获取和数据收集。此外,控制湄公河次区域地下水中砷释放的关键机制分布不均,且可能因地区而异。本项目的主要目的是确定区域砷污染水平,以期帮助政府将区域地下水砷风险降低政策纳入其近期规划。于2022年5月和8月分别在柬埔寨和老挝进行了抽样。调查结果显示,与老挝相比,柬埔寨某些地区的地形暴露出地下水中砷的浓度明显较高。柬埔寨约33%的采样点显示出高砷污染(> 10微克/升,世卫组织指南),其浓度范围为47.7±0.8至696.9±5.6 ppb。理化性质表明两个研究区对砷的控制机制完全不同。在区域层面开展更多与气候变化和砷水文相关的区域和特定地点砷污染研究,以确保特定区域的水安全规划。此外,我们相信这项研究的结果将有利于湄公河的政策和区域水安全计划,特别是在柬埔寨。
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引用次数: 0
Climate change risk perceptions, vulnerability, and adaptation in high altitude farming regions of Hindu Kush Himalaya 兴都库什-喜马拉雅高海拔农业区的气候变化风险认知、脆弱性和适应
Pub Date : 2023-06-27 DOI: 10.30852/sb.2023.2184
S. Asad, M. Abid, I. Ahmad, G. Thapa, Tashi Dendup
Hindu Kush Himalaya (HKH) is highly vulnerable to climate change, but there is the least understanding of the impacts of climate change. This study explored local climate change risk perceptions, vulnerability, and adaptive responses in the three HKH countries, Pakistan, Nepal, and Bhutan. For this purpose, 379 farm households from low, medium, and high elevations in the study districts of Rasuwa in Nepal, Gilgit in Pakistan and the Central District in Bhutan were surveyed. A semi-structured digital survey was used for data collection. Further, the study used the IPCC climate vulnerability framework to explore the farm-level vulnerability to climate change in three HKH countries. The study revealed that farmers in the study areas strongly agreed that the climate was changing in the region with high summer temperatures and increasing frequency and intensity of weather-related extreme events. Increasing poverty and limited institutional services make farmers more vulnerable to climate risks. Farmers reported reduced agricultural productivity and decreased revenue caused by climate change. Crop yields at high altitudes were slightly higher, but only because of multiple cropping triggered by weather patterns. Lack of information, resources, and institutional support significantly hamper the farmers’ adaptive capacity. A small fraction of the farmers adopted improved crop varieties and land management. The study recommends improving outreach and institutional services, especially climate-specific farm advisory services in HKH countries.
兴都库什-喜马拉雅山脉(HKH)极易受到气候变化的影响,但人们对气候变化的影响了解最少。本研究探讨了巴基斯坦、尼泊尔和不丹这三个HKH国家的当地气候变化风险认知、脆弱性和适应性响应。为此,研究人员对尼泊尔拉苏瓦、巴基斯坦吉尔吉特和不丹中央区低、中、高海拔地区的379户农户进行了调查。数据收集采用半结构化的数字调查。此外,本研究利用IPCC气候脆弱性框架探讨了三个HKH国家的农业对气候变化的脆弱性。研究表明,研究地区的农民强烈认为,该地区的气候正在发生变化,夏季气温高,与天气有关的极端事件的频率和强度都在增加。日益严重的贫困和有限的机构服务使农民更容易受到气候风险的影响。农民报告说,气候变化导致农业生产力下降,收入减少。高海拔地区的作物产量略高,但这只是因为天气模式引发的多次种植。信息、资源和制度支持的缺乏严重阻碍了农民的适应能力。一小部分农民采用了改良的作物品种和土地管理方法。该研究建议改善外联服务和机构服务,特别是在HKH国家针对气候的农场咨询服务。
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引用次数: 0
Strengthening adaptive capacities of small holding South Asian agrarian community through Climate Information Network -based decision support tool 通过基于气候信息网络的决策支持工具加强南亚小农农业社区的适应能力
Pub Date : 2023-06-14 DOI: 10.30852/sb.2023.2188
Amitava Aich, D. Dey, Malancha Dey, Udita Ghosh Sarkar, Ajishnu Roy
Marginal farmers in rain-fed agrarian systems can benefit immensely from real-time contingency planning and decisionmaking tools in the climate milieu. Long-term climate anomaly prediction of some selected locations was made. Forty-two Global Circulation Models (GCM) from the Coupled Model Intercomparison Project Phase 5 project (CMIP5) were used for the present work and Representative Concentration Pathway (RCP) 4.5 to prepare future projections. The effect of the climate anomaly on existing farming practices in two selected climate-vulnerable locations of Purulia, India, and Shyamnagar, Bangladesh, has been analysed. A participatory action research and Climate Information Network (CIN)-based crop calendar has been devised for the selected locations. An interactive Android bot in the form of a Decision-Making Cropping Support System (DMCSS) has been devised and field tested. This system can provide seasonal crop suggestions and suggest contingency management to farmers. The system also provides risk assessments on the basis of preparedness and categorical inputs that users provide on crop, climate and contrivances.
雨养农业系统中的边缘农民可以从气候环境中的实时应急计划和决策工具中受益匪浅。对部分地点进行了长期气候异常预测。本研究使用了来自耦合模式比对项目第5阶段项目(CMIP5)的42个全球环流模式(GCM),并使用代表性浓度路径(RCP) 4.5来准备未来的预测。气候异常对印度Purulia和孟加拉国Shyamnagar这两个选定的气候脆弱地区现有农业实践的影响进行了分析。为选定的地点设计了一个参与性行动研究和气候信息网(CIN)为基础的作物日历。一个交互式的安卓机器人在决策种植支持系统(DMCSS)的形式已经设计和现场测试。该系统可以为农民提供季节性作物建议和应急管理建议。该系统还根据防备情况和用户提供的关于作物、气候和设备的分类投入提供风险评估。
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引用次数: 0
How to measure urban water security? An introduction to the Water Security Assessment Tool (WATSAT) 如何衡量城市水安全?水安全评估工具(WATSAT)简介
Pub Date : 2023-05-19 DOI: 10.30852/sb.2023.2166
M. Babel, Kaushal Chapagain, V. Shinde
The objective of the project was to develop a web-based digital tool called the Water Security Assessment Tool (WATSAT) to help city authorities and decision-makers make an objective evaluation of the water security situation in the city. It uses an indicator-based methodology that measures five distinct dimensions (broad elements) of water security: “Water supply and sanitation”, “Water productivity”, “Water-related disasters”, “Water environment”, and “Water governance”, which together culminate into a Water Security Index (WSI). The tool is developed based on the water security assessment framework developed by Babel, Dang, Sharma, and Shinde (2015). WATSAT results in a quantitative assessment of water security in a city, wherein the WSI provides an overall picture of the water security situation in a city, while the evaluation of the various dimensions helps identify areas of concern. WATSAT aids city authorities in having a holistic understanding of water security and interconnections of various factors affecting it and assists them in informed decision-making to arrive at system-based interventions to tackle water security threats in the cities.
该项目的目标是开发一个基于网络的数字工具,称为水安全评估工具(WATSAT),以帮助城市当局和决策者对城市的水安全状况进行客观评估。它采用一种基于指标的方法,衡量水安全的五个不同方面(广泛要素):“供水和卫生”、“水生产力”、“与水有关的灾害”、“水环境”和“水治理”,这些因素共同构成了水安全指数。该工具是基于Babel, Dang, Sharma和Shinde(2015)开发的水安全评估框架开发的。WATSAT对一个城市的水安全进行定量评估,其中WSI提供了一个城市水安全状况的总体情况,而对各个维度的评估有助于确定关注的领域。WATSAT帮助城市当局全面了解水安全和影响水安全的各种因素之间的相互联系,并帮助他们做出明智的决策,以达成基于系统的干预措施,以解决城市中的水安全威胁。
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引用次数: 2
Factors influencing farmers’ climate change adaptation in Southeast Asia: A comparative study from Vietnam, Laos, and Cambodia 影响东南亚农民气候变化适应的因素:来自越南、老挝和柬埔寨的比较研究
Pub Date : 2023-04-11 DOI: 10.30852/10.30852/sb.2023.2101/
Thanh Mai Ha, Sayvisene Boulom, Fue Yang, Pisidh Voe, Cong Duan Dao, Thi Thanh Loan Le, Xuan Phi Dang, Thi Thai Hoa Hoang, Thangrak Veu, Socheat Ngy, D. Ha
Southeast Asia is among the most climate-vulnerable regions in the world. Despite this, little is known about how climate change adaptation at the household level differs across countries in this geographic region. This cross-country study investigated factors influencing adopting three adaptation practices: growing climate-tolerant crops, intercropping, and switching to cash crops in some selected provinces in Vietnam, Laos, and Cambodia. Based on the survey data from 1017 farm households in these three countries, the paper found that surveyed households in Laos and Cambodia were less likely to adopt the three practices than those in Vietnam. Perception about the impacts of climate change and perceived usefulness of climate change adaptation consistently influenced the adoption likelihood of those practices. Information on climate change shaped farmers’ decision to select climate-tolerant varieties and diversify crops. Policy implications aiming at fostering farmers’ adoption of adaptation practices are discussed.
东南亚是世界上气候最脆弱的地区之一。尽管如此,人们对该地理区域各国在家庭层面的气候变化适应有何不同知之甚少。这项跨国研究调查了影响越南、老挝和柬埔寨一些选定省份采用三种适应做法的因素:种植气候耐受性作物、间作和转向经济作物。基于对这三个国家1017个农户的调查数据,本文发现老挝和柬埔寨的被调查农户采用这三种做法的可能性低于越南。对气候变化影响的认识和对适应气候变化有用性的认识始终影响着采用这些做法的可能性。有关气候变化的信息影响了农民选择耐气候品种和使作物多样化的决定。讨论了旨在促进农民采用适应做法的政策含义。
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引用次数: 0
Potential of agroforestry for climate change adaptation in the Northwest mountainous region of Vietnam 越南西北山区农林业适应气候变化的潜力
Pub Date : 2023-04-10 DOI: 10.30852/sb.2023.2147
Thi Thanh Ha Do, Minh Hong Bui
The literature on the impacts of climate change on the Northwest mountainous region of Vietnam was assessed in this article. Additionally, the project team conducted regional interviews and visits to gather information on the same topic. The findings indicate that climate change has had a significantly negative impact on the region's agriculture, the primary income source for the local population. Furthermore, the local communities have a limited understanding of the subject matter. However, the existing agroforestry system in the region may prove to be an effective measure for adapting to the impacts of climate change. In addition to increasing local awareness and understanding of climate change, further efforts are necessary to improve the agroforestry system in the region. These efforts should consider the region's diverse population and terrain characteristics.
本文对气候变化对越南西北山区影响的文献进行了评估。此外,项目小组还进行了区域访谈和访问,以收集关于同一主题的信息。研究结果表明,气候变化对该地区的农业产生了显著的负面影响,而农业是当地人口的主要收入来源。此外,当地社区对这一主题的理解有限。然而,该地区现有的农林复合系统可能被证明是适应气候变化影响的有效措施。除了提高当地对气候变化的认识和了解外,还需要进一步努力改善该地区的农林业系统。这些努力应考虑到该地区不同的人口和地形特征。
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引用次数: 0
Tracking influences of Asian Urban GHG emissions for Sustainability Policies: Preliminary Report 跟踪亚洲城市温室气体排放对可持续发展政策的影响:初步报告
Pub Date : 2023-03-20 DOI: 10.30852/sb.2023.2106
P. Marcotullio, Xiangzheng Deng, Zhihui Li, A. Gasparatos, Jelena Aleksejeva, Shu-li Huang, Po-Ju Huang, S. Dhakal, Subina Shrestha, Kwang-ik Wang, Gowri Anand, Jessica Stretton
While nations have made commitments to address climate change, scholars estimate that even if these commitments are met, there remains an emissions gap between where we are and where we want to be to keep the globe under 1.5°C. Cities around the world are working to reduce this gap. Asian cities are large greenhouse gas (GHG) emitters and will be so over the next few decades. It is therefore urgent to identify ways in which the region’s cities can become more efficient and less polluting. This study is an APN research project that examines the GHG emissions at the sub-city level across 5 Asian cities (Tokyo, Beijing, Taipei, Seoul and Bangkok) as well as in New York City. The attempt is to identify potential strategies for low-carbon pathways. The research demonstrates that, in most cases, national and urban emissions are increasing, although the APN research teams identified stable emissions over the past few years in Beijing and Tokyo. However, the emissions profiles are different. Therefore, reducing emissions will require different strategies across the region’s cities. The study identifies some general policy priorities for cities based on the results of case studies.
虽然各国都做出了应对气候变化的承诺,但学者们估计,即使这些承诺得到兑现,在我们的现状和我们希望将全球气温升高控制在1.5摄氏度以内的目标之间,仍存在排放差距。世界各地的城市都在努力缩小这一差距。亚洲城市是温室气体(GHG)排放大户,未来几十年还将如此。因此,迫切需要找到提高该地区城市效率和减少污染的方法。本研究是一个APN研究项目,研究了亚洲5个城市(东京、北京、台北、首尔和曼谷)以及纽约市的副城市温室气体排放情况。其目的是确定低碳途径的潜在战略。研究表明,在大多数情况下,国家和城市的排放量都在增加,尽管APN研究小组发现,过去几年北京和东京的排放量保持稳定。然而,排放情况有所不同。因此,减少排放需要该地区各城市采取不同的策略。该研究根据案例研究的结果确定了城市的一些一般政策优先事项。
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引用次数: 0
Strengthening adaptive capacity of rural farming communities in Southeast Asia: Experiences, best practices and lessons for scaling-up 加强东南亚农村农业社区的适应能力:推广的经验、最佳做法和教训
Pub Date : 2023-03-13 DOI: 10.30852/sb.2023.2104
L. Landicho, Marcos Ramirez
This article highlights the experiences, contributions, and lessons generated from the ten selected APN capacity development programmes implemented from 2011-2019 and focused on enhancing the resilience and adaptive capacity of rural farming communities in Southeast Asia. These capacity development projects employed varying strategies and approaches. Some projects centred on training and building the technical capabilities of service providers, while others have directly trained and built the capacities of the farming communities. Some projects emphasised the promotion of nature-based and sustainable farming techniques such as agroforestry, conservation farming, rainwater harvesting, and indigenous agricultural practices that helped farming communities cope and adapt to climate change impacts. At the core of these capacity development programmes are collaboration and partnerships that were built and institutionalised among different sectors, such as academia, local government units, and the farming communities. These multisectoral collaborations hastened the project implementation and generation of project outputs and gave way to the sustainability of the project initiatives. These projects have generated numerous outputs that paved the way for enhanced social and human capital development of various stakeholders, science-based decision-making by policymakers; adoption of sustainable farming techniques and technologies; and knowledge generation and advancement of science. More importantly, these projects have developed a model for enhancing the adaptive capacity and resilience of rural farming communities in Southeast Asia.
本文重点介绍了2011-2019年实施的十个APN能力发展项目的经验、贡献和教训,这些项目侧重于提高东南亚农村农业社区的抵御力和适应能力。这些能力发展项目采用了不同的战略和方法。一些项目集中于培训和建设服务提供者的技术能力,而另一些项目则直接培训和建设农业社区的能力。一些项目强调推广以自然为基础的可持续农业技术,如农林业、保护性农业、雨水收集和土著农业实践,帮助农业社区应对和适应气候变化的影响。这些能力发展计划的核心是在学术界、地方政府单位和农业社区等不同部门之间建立并制度化的合作和伙伴关系。这些多部门合作加速了项目的执行和项目产出的产生,并使项目倡议具有可持续性。这些项目产生了许多成果,为加强各利益攸关方的社会和人力资本开发、决策者基于科学的决策铺平了道路;采用可持续农业技术和技术;知识的产生和科学的进步。更重要的是,这些项目为提高东南亚农村农业社区的适应能力和抵御能力提供了一种模式。
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引用次数: 1
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APN Science Bulletin
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