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Critical slowing down in cone production of longleaf pine trees 长叶松球果生产的临界减缓
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-11-27 DOI: 10.1080/14728028.2022.2152391
Xiongwen Chen, Kimberly A. Bowman, J. L. Willis
ABSTRACT Longleaf pine forests were historically distributed throughout the southeastern United States and played an important role in local sectors of society, economy, and ecology. The longleaf pine became an endangered ecosystem due to over-harvesting, broad land-use change, and fire suppression. One major factor that has challenged restoration efforts is sporadic seed production. Based on collected cone production data in the past six decades, we tested whether critical slowing down existed in cone production at three longleaf pine locations. Our results indicated decreased variance and increased autocorrelation in variance before a high cone production. These results provide a new understanding of cone production from the perspective of a dynamic system. This method may be helpful in predicting years of favorable cone production for forest management.
摘要长叶松林历史上分布在美国东南部,在当地社会、经济和生态部门发挥着重要作用。由于过度采伐、土地利用的广泛变化和灭火,长叶松成为了一个濒危的生态系统。对恢复工作构成挑战的一个主要因素是零星的种子生产。根据过去60年收集的锥体生产数据,我们测试了三个长叶松地点的锥体生产是否存在严重放缓。我们的结果表明,在高锥产量之前,方差降低,自相关增加。这些结果从动力学系统的角度提供了对圆锥生产的新理解。该方法可能有助于预测森林管理的有利锥产量年份。
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引用次数: 1
A review of and reflections on Adaptive Collaborative Management in Forest Landscapes: Villagers, Bureaucrats, and Civil Society 森林景观适应性协同管理的回顾与思考:村民、官僚与民间社会
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-10-02 DOI: 10.1080/14728028.2022.2136252
N. Peluso
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引用次数: 0
Determinants of farmer’s decision to transit to medium/larger farm through expansion of land area under commercial tree crop plantation in Nigeria 农民决定通过扩大尼日利亚商业林木种植园的土地面积转移到中型/大型农场的决定因素
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-10-02 DOI: 10.1080/14728028.2022.2132541
A. Aromolaran, A. Obayelu, M. Muyanga, T. Jayne, A. Adelaja, T. Awokuse, O. O. Ogunmola, O. H. Osinowo
ABSTRACT Decision-making is central to farm management. This study assesses key factors influencing land allocation decisions of households with respects to tree crop cultivation in Nigeria. The study uses primary data collected electronically from a sample of 569 small and 495 medium-scale farmers in Ogun State.Tobit and Heckman regression models were estimated. The study finds that, farm households who have access to land markets and land tenure security, all-weather roads, agro-dealer services and better transportation services are more likely to cultivate tree crop fields and allocate a higher share of total farm holdings to tree crop enterprises. Farm households with more educated heads put larger area of land under commercial tree crop cultivation and those with larger off-farm income tend to cultivate less hectarage to tree crops. The share of farmland allocated to tree crops by male headed households is higher than the share by the female headed households. In addition, female and youth-headed households were found to be less likely to invest in commercial tree crop farming. Policies and intervention programs that would enhance access to land, agro-dealer services, all-weather roads, transportation services and security of land tenure could facilitate the redistribution of land in favour of commercial tree crops.
决策是农场管理的核心。本研究评估了影响尼日利亚家庭在林木种植方面土地分配决策的关键因素。该研究使用了从奥贡州569名小型和495名中型农民样本中以电子方式收集的原始数据。对Tobit和Heckman回归模型进行了估计。研究发现,拥有土地市场和土地使用权保障、全天候道路、农业经销商服务和更好的运输服务的农户更有可能种植林木作物,并将更高比例的农场总资产分配给林木企业。户主受教育程度越高的农户,经济用材林种植面积越大,非农收入越高的农户,经济用材林种植面积越少。男性户主家庭分配给林木作物的耕地比例高于女性户主家庭。此外,女性和青年为户主的家庭不太可能投资于商业林木种植。促进获得土地、农贸商服务、全天候道路、运输服务和土地保有权保障的政策和干预方案,可以促进有利于商业林木作物的土地再分配。
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引用次数: 0
Socioeconomic factors influencing farmers’ willingness to replant trees: evidence from smallholder rubber farming in Sri Lanka 影响农民重新种植树木意愿的社会经济因素:来自斯里兰卡小农户橡胶种植的证据
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-10-02 DOI: 10.1080/14728028.2022.2145509
J. Sankalpa, P. Ishani, W. Wijesuriya
ABSTRACT Planting trees is a source of income for many smallholders worldwide and is critical for providing a range of ecosystem services. The effectiveness of the policies and incentives to encourage tree farming by smallholder farmers depends on the socioeconomic context of the farm households. The study investigates smallholder farmers’ willingness to replant rubber after reaching its economic lifespan while also examining the impact of farm households’ socioeconomic factors on willingness to replant. Using the utility maximization theory and logit model, the paper analyses household-level data collected from 404 smallholder farmers in Sri Lanka. The empirical findings show that about 71% of farmers are willing to replant rubber. Socioeconomic characteristics of farm households are significantly associated with the willingness to replant rubber. Considering the increase in the probability of willingness, factors such as education level of household head, share-cropping, family labour, income generation from rubber farming, non-farm income, other agricultural income, farmers group participation, and institutional support, positively affect farmers’ willingness to replant rubber. The findings suggest that considering these factors in the formulation of appropriate incentives and strategies for rubber farm diversification would foster a beneficial environment for smallholder rubber farming.
摘要植树造林是世界各地许多小农户的收入来源,对提供一系列生态系统服务至关重要。鼓励小农户植树造林的政策和激励措施的有效性取决于农户的社会经济背景。这项研究调查了小农户在橡胶达到经济寿命后重新种植橡胶的意愿,同时也考察了农户的社会经济因素对重新种植意愿的影响。运用效用最大化理论和logit模型,分析了斯里兰卡404名小农户的家庭层面数据。实证结果表明,约71%的农民愿意重新种植橡胶。农户的社会经济特征与重新种植橡胶的意愿显著相关。考虑到意愿的增加,户主的教育水平、股份种植、家庭劳动力、橡胶种植创收、非农收入、其他农业收入、农民群体参与和制度支持等因素对农民重新种植橡胶的意愿产生了积极影响。研究结果表明,在制定橡胶农场多样化的适当激励措施和战略时考虑这些因素,将为小农户橡胶种植创造有利的环境。
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引用次数: 0
Empirical examination of financial and economic viability of Moringa oleifera production in the Bono East Region, Ghana 加纳博诺东部地区辣木生产财务和经济可行性的实证检验
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-10-02 DOI: 10.1080/14728028.2022.2141349
Christopher Kudzinawo, D. Awunyo-Vitor, C. Wongnaa
ABSTRACT This paper aims to assess the financial and economic viability of Moringa oleifera production as well as processing yield using data collected from 75 moringa farmers and a processing firm in the Bono East Region of Ghana. Descriptive statistics, as well as the discounted and non-discounted measures of project worth, were employed as analytical tools. A three-scenario based sensitivity analysis followed this to measure the robustness of the viability indicators to varying parameter values. The results revealed that an investment in Moringa oleifera production has a payback period of 1 year, 10 months, NPV of GH₵ 4,857.46(US$ 833), a BCR of 1.65 and an IRR of 63%, indicating Moringa oleifera production in the Bono East Region is viable. Considering the viability of this plantation and the potential it portrays for sustainable development, income generation, and job creation, we recommend that governments, Non-Governmental Organizations, and donor agencies support, invest, and encourage the cultivation, consumption, and activities of value addition to Moringa oleifera in their programs. This will lead to nutritional security, youth empowerment and liberation of villages and rural communities from intense poverty. It is also recommended that the government includes moringa plantation in its planting for food and jobs programs.
本文旨在利用从加纳博诺东部地区的75名辣木农民和一家加工公司收集的数据,评估辣木生产的财务和经济可行性以及加工产量。描述性统计以及项目价值的贴现和非贴现措施被用作分析工具。随后进行了基于三种情况的敏感性分析,以衡量活力指标对不同参数值的稳健性。结果显示,投资辣木生产的投资回收期为1年10个月,净现值为4,857.46美元(833美元),BCR为1.65,内部收益率为63%,表明在波诺东地区生产辣木是可行的。考虑到该种植园的生存能力及其在可持续发展、创收和创造就业方面的潜力,我们建议各国政府、非政府组织和捐助机构在其项目中支持、投资和鼓励辣木的种植、消费和增值活动。这将导致营养安全、青年赋权以及将村庄和农村社区从极度贫困中解放出来。还建议政府将辣木种植纳入其粮食和就业种植计划。
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引用次数: 3
Market potential of shea caterpillars in the Bunkpurugu-Nakpanduri District of the North East region of Ghana 加纳东北部Bunkpurugu Nakpanduri区乳木果毛虫的市场潜力
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-09-22 DOI: 10.1080/14728028.2022.2125082
Krishnanunni Mavinkal Ravindran, H. Haruna, P. Lovett
ABSTRACT Traditionally consumed by certain communities in Africa’s shea-growing belt, shea caterpillars (Cirina butyrospermi, Vuillot 1911) have seen a growing market demand over the years. Although shea caterpillars are one of the most common insect species associated with shea parklands in Ghana, limited literature exists on these caterpillars’ market prospects. With the governments recognizing the economic potential of shea nuts, there have been various efforts to document the shea nut trade in all major shea producing countries. However, it is still unknown what volumes of shea caterpillar trade occur in Ghana. Our study area includes the five key markets that are popular for shea caterpillar trade in the Bunkpurugu-Nakpanduri district of the North East Region of Ghana. This paper uses qualitative and quantitative data collected through key-informant interviews, guided market surveys, and focus group discussions to shed light on the annual trade of shea caterpillars, their supply chains, the value of the sector, and some sustainability concerns. Our results could guide the research community to investigate these caterpillars’ commercial prospects as edible food.
乳木果毛虫(Cirina butyrospermi, vuilllot 1911)是非洲乳木果种植带某些社区的传统消费产品,多年来市场需求不断增长。虽然乳木果毛虫是与加纳乳木果公园有关的最常见的昆虫物种之一,但关于这些毛虫的市场前景的文献有限。随着各国政府认识到乳木果的经济潜力,所有主要乳木果生产国都在努力记录乳木果贸易。然而,目前尚不清楚在加纳发生了多少乳木果毛虫贸易。我们的研究区域包括加纳东北地区bunkpuruguu - nakpanduri地区羊油果毛虫贸易的五个主要市场。本文利用通过关键信息提供者访谈、指导性市场调查和焦点小组讨论收集的定性和定量数据,揭示了乳木果毛虫的年度贸易、其供应链、该部门的价值以及一些可持续性问题。我们的研究结果可以指导研究界研究这些毛虫作为食用食品的商业前景。
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引用次数: 1
Combining air-layering and stem cutting techniques to optimize the production of quality planting materials for agroforestry tree species: a case study of Canarium schweinfurthii Engl. (Burseraceae) 结合空气分层和茎切技术优化农林业树种优质种植材料的生产——以Canarium schweinfurthii Engl为例(橄榄科)
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-07-03 DOI: 10.1080/14728028.2022.2103034
G. Kanmegne, Raïssa S. Atchioutchoua, Gaston R. Tsopmbeng Noumbo
ABSTRACT Using Canarium schweinfurthii as biological model, the present study evaluated the potential of combining air-layering and stem cutting techniques to optimize the production of agroforestry trees’ propagules. Three substrates and five concentrations of indole butyric acid (IBA) were tested for their effects on the rooting of air-layers. Stockplants were raised from air-layered propagules and used for stem cutting trial. Three levels of stockplant irradiance and five IBA concentrations were tested for their effects on the rooting of stem cuttings. Results showed that the combination of Sawdust substrate and 5 g/l IBA resulted in highest percentage of rooted layers (79.3 ± 7.6%) and highest number of roots per rooted layer (34.9 ± 0.7). Sawdust recorded the lowest layers’ mortality rate (6 ± 1.9%). Alive cuttings sprouted and rooted at 100%. The lowest mortality rates of cuttings (14 ± 4.8%) and the highest number of roots per rooted cutting (25.5 ± 0.1) were recorded with 10 g/l IBA × 50% ambient sunlight treatment combination. Using air-layered propagules for stockplant production could make it easy to achieve stockplant management practices like shading. Combining air-layering and stem cutting techniques enhanced the multiplication rate of propagules. This provides valuable insights for tree domestication practices worldwide.
摘要本研究以金丝雀为生物模型,评价了空气分层和树干切割技术相结合优化农林树木繁殖体生产的潜力。试验了三种基质和五种浓度的吲哚丁酸(IBA)对空气层生根的影响。放养植物由空气分层繁殖体培育,并用于茎干切割试验。试验了三个水平的砧木辐照度和五个浓度的IBA对茎插条生根的影响。结果表明,木屑基质与5g/l IBA组合,生根率最高(79.3±7.6%),每根层根数最高(34.9±0.7),枯死率最低(6±1.9%),活插穗发芽生根率为100%。10克/升IBA×50%环境光照处理组合的插穗死亡率最低(14±4.8%),每根插穗生根数最高(25.5±0.1)。使用空气分层繁殖体进行畜牧业生产可以很容易地实现畜牧业管理实践,如遮荫。空气分层和茎切技术相结合提高了繁殖体的繁殖率。这为世界各地的树木驯化实践提供了宝贵的见解。
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引用次数: 0
Indigenous knowledge on wild mushrooms in communities bordering miombo woodlands of central Zimbabwe 津巴布韦中部米翁博林地附近社区野生蘑菇的土著知识
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-07-03 DOI: 10.1080/14728028.2022.2108510
Alec Mlambo, M. Maphosa
ABSTRACT Apart from timber, fruits, honey, firewood and other benefits from forests, mushrooms are an important forest food resource whose gathering has largely relied on indigenous knowledge systems (IKS). We surveyed five miombo woodland rural communities in central Zimbabwe with respondents of at least 16 years old, focusing on wild mushroom identification criteria used, ethnomycological knowledge transmission mechanisms, known mushroom foragers, known woody species associated with gathered mushrooms, and indigenous mushroom nomenclature systems used. Mushroom cap colour (99.52 %) was of similar importance to use of cap texture (95.78%) but more important (p ≤ .05) than cap shape, or other attributes. Women (69.04%) were more important (p ≤ .05) knowledge transmitters than other family members. Millipedes (91.79%) and insects (83.55%) constituted higher (p ≤ .05) mushroom foraging mention than other invertebrates. Julbernardia globiflora (84.16%) was more favourably mentioned (p ≤ .05) to associate with most mushrooms than other woody species. Mushroom nomenclature largely derived from their morphological traits, texture and habitat. The study demonstrates prevalence of moderately strong IKS and mushroom links to vegetation. These findings will help in ethnomycological research on aspects of miombo mushrooms and any relevant forest policy to benefit rural communities.
摘要除了木材、水果、蜂蜜、木柴和其他来自森林的好处外,蘑菇还是一种重要的森林食物资源,其采集在很大程度上依赖于本土知识系统。我们调查了津巴布韦中部的五个米万博林地农村社区,受访者年龄至少为16岁,重点关注使用的野生蘑菇鉴定标准、民族真菌学知识传播机制、已知的蘑菇觅食者、与采集的蘑菇相关的已知木本物种,以及使用的本土蘑菇命名系统。蘑菇菌盖颜色(99.52%)与菌盖纹理的使用具有相似的重要性(95.78%),但比菌盖形状或其他属性更重要(p≤.05)。女性(69.04%)比其他家庭成员更重要(p≤.05)知识传递者。千足虫(91.79%)和昆虫(83.55%)的蘑菇觅食次数高于其他无脊椎动物(p≤.05)。与其他木本物种相比,球形朱氏菌(84.16%)在大多数蘑菇中的提及率更高(p≤.05)。蘑菇的命名主要来源于它们的形态特征、质地和栖息地。该研究表明,中度强烈的IKS和蘑菇与植被之间存在联系。这些发现将有助于对米翁博蘑菇各方面的人种学研究以及任何有利于农村社区的相关森林政策。
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引用次数: 1
What benefit-sharing mechanisms can help forestry-based land restitution beneficiaries in South Africa? The case of Limpopo province forestry projects 哪些利益分享机制可以帮助南非以林业为基础的土地归还受益者?林波波省林业项目案例
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-06-27 DOI: 10.1080/14728028.2022.2089735
L. Makhubele, R. Tshidzumba, P. Chirwa
ABSTRACT The capture of the benefits by the elites due to the lack of a benefit-sharing mechanism is a serious threat to the development of forestry land restitution projects in South Africa. This study investigated the benefit-sharing mechanisms desirable to land claimant beneficiaries in forestry-based land restitution projects. A random sampling technique was used to select 351 and 170 households’ beneficiaries in Levubu and Tzaneen communities in Limpopo Province, respectively. Data were collected using a household questionnaire and focus group discussions. Descriptive and inferential statistics were used to analyse data. Findings revealed that there are still no benefit-sharing mechanisms in Levubu and Tzaneen communities, but the beneficiaries comprehend the significance of developing a benefit-sharing mechanism for fair and equal distribution of benefits. The results revealed that stakeholders’ meetings (58.7%) and open beneficiaries’ meetings (40.6%) were preferred mechanisms. In addition, beneficiaries in both Levubu (54.4%) and Tzaneen (68.9%) preferred to receive benefits monthly. This paper provides the first overview of a benefit-sharing model in forestry-based land restitution projects in South Africa. It concludes that there is a need to consider the early development of a benefit-sharing mechanism in land restitution projects in order to allow a greater equal share of the benefits.
摘要由于缺乏利益分享机制,精英阶层攫取利益是南非林业土地恢复项目发展面临的严重威胁。本研究探讨了森林土地恢复项目中土地索赔受益人的利益分享机制。采用随机抽样技术,分别在林波波省Levubu和Tzaneen社区选择了351户和170户家庭的受益人。数据收集采用家庭问卷和焦点小组讨论。采用描述性统计和推理统计对数据进行分析。调查结果显示,Levubu和Tzaneen社区仍然没有利益分享机制,但受益者理解建立利益分享机制对公平和平等分配利益的重要性。结果显示,利益相关者会议(58.7%)和公开受益人会议(40.6%)是首选的机制。此外,Levubu(54.4%)和Tzaneen(68.9%)的受益人都倾向于每月领取福利。本文首次概述了南非基于森林的土地恢复项目的利益分享模式。报告的结论是,有必要考虑在土地归还项目中尽早建立利益分享机制,以便更平等地分享利益。
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引用次数: 1
Contract farming scheme for rubber production in Western region of Ghana: why do farmers side sell? 加纳西部地区橡胶生产的合同种植方案:为什么农民一方出售?
Q4 ENVIRONMENTAL STUDIES Pub Date : 2022-06-09 DOI: 10.1080/14728028.2022.2079007
Joshua Ewusi Koomson, Emmanuel Donkor, Victor Owusu
ABSTRACT Contract farming guarantees smallholder farmers a reliable market, allow them to access inputs and technical support, and thus improve their welfare. However, side selling is a major threat to the promotion and development of contract farming in Sub-Saharan Africa, including in Ghana. While there is growing interest in addressing this issue for food crops and other tree crops, particularly coffee, there is limited literature on this subject for rubber. Against this background, our paper contributes to filling this knowledge gap by answering the research question “Why do smallholder farmers engage in side selling?” using primary data from 370 rubber farmers participating in an outgrower scheme in Western region of Ghana. A binary Probit regression model is applied in the empirical analysis. We find that 20% of the rubber farmers engaged in contract farming are involved in side selling. The results show that contractor’s delays in payment, delays in weighing latex and farmers’ difficulty in getting truck to transport latex to sale point are positively correlated with side selling behaviour while farmers’ age and access to extension services decrease their likelihood of engaging in side selling. To curb side selling behaviour among rubber farmers, it is important that the contractor addresses the transaction related challenges faced by farmers.
合同农业为小农提供了一个可靠的市场,使他们能够获得投入和技术支持,从而提高了他们的福利。然而,副业销售是撒哈拉以南非洲地区(包括加纳)推广和发展合同农业的主要威胁。虽然人们对解决粮食作物和其他树木作物,特别是咖啡的这一问题越来越感兴趣,但关于橡胶这一主题的文献有限。在此背景下,我们的论文通过回答“为什么小农从事侧销?”使用了来自加纳西部地区370名橡胶农参与的外植者计划的原始数据。采用二元Probit回归模型进行实证分析。我们发现从事合同种植的橡胶农中有20%参与了侧销。结果表明,承包商的延迟付款、延迟称重和农民难以获得卡车将乳胶运送到销售点与侧卖行为呈正相关,而农民的年龄和获得推广服务的可能性降低了他们从事侧卖的可能性。为了遏制胶农的侧卖行为,承包商必须解决胶农面临的与交易相关的挑战。
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引用次数: 2
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