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Livelihood Factors and Household Strategies for an Unexpected Climate Event in Upland Northern Laos 被引量:1
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作者 Phanxay INGXAY Satoshi YOKOYAMA isao hirota 《Journal of Mountain Science》 SCIE CSCD 2015年第2期483-500,共18页
Climate events pose major challenges to food production and the livelihoods of rural inhabitants in northern Laos, where upland rice using swidden production is an important crop. The onset of the rainy season in this... Climate events pose major challenges to food production and the livelihoods of rural inhabitants in northern Laos, where upland rice using swidden production is an important crop. The onset of the rainy season in this area is one such climate event, and it has occurred earlier and with less regularity in recent years. Not all households are able to cope with these changes. This study examines the ability of local farmers to cope with rice insufficiency. This investigation also clarifies household strategies in dealing with the climate event. We randomly interviewed 63 of 95 household heads, and performed a paired sample t test to examine the significance of differences in three household groups between the 2010 normal climate and the 2011 climate event. The groups were categorized according to rice selfsufficiency in 2011: groups I are households with rice self-sufficiency, group II are those facing a rice shortage of up to 3 months, and group III are those with insufficient rice for over 3 months. We also conducted a one-way ANOVA to examine the significance of differences in livelihood strategies among the three groups. We found that the household labor force was the most important factor in enhancing the villagers' ability to deal with the climate event and that the level of impact of that event shaped their coping strategies. Households with substantial labor force had more options for coping strategies than those with smaller ones. The villagers faced different levels of impact and adopted differentcoping strategies accordingly. Non-timber forest product collection was the principle livelihood strategy in response to non-climate factors such as education, access to health services, provision of equipment and clothing, and overcoming the impact of the climate event. Households heavily affected by the early rainy season onset tended to engage in intensive activities such as off-farm activity and outside work, rather than their major livelihood activities in the village(upland crop and livestock production). 展开更多
关键词 气候事件 家庭 老挝 陆地棉 配对样本t检验 单因素方差分析 粮食生产 非木材林产品
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Aboveground biomass and seasonal patterns of aboveground net primary productivity in five bamboo species in northern Laos
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作者 Singkone Xayalath isao hirota +1 位作者 Shinsuke Tomita Michiko Nakagawa 《Journal of Plant Ecology》 SCIE CSCD 2020年第2期150-156,共7页
评价竹林的固碳潜力,需要对竹林生物量和净初级生产力(NPP)进行准确的估算。然而,在东亚和印度以外的地区对减缓气候变化很重要的相关数据收集的很少。关于NPP及其组分季节模式的信息将有助于量化影响竹林碳平衡的因素。在本研究中,我... 评价竹林的固碳潜力,需要对竹林生物量和净初级生产力(NPP)进行准确的估算。然而,在东亚和印度以外的地区对减缓气候变化很重要的相关数据收集的很少。关于NPP及其组分季节模式的信息将有助于量化影响竹林碳平衡的因素。在本研究中,我们使用了超过12个月的每月数据,对老挝北部5个主要竹林植物的地上生物量(AGB)和地上NPP进行了量化。对四种合轴分枝的竹品种Bambusa tulda,Cephalostachyum virgatum,Dendrocalamus membranaceus和Gigantochloa sp.,每个物种随机选取30个群丛;对单轴分枝的Indosasa sinica,我们建立了10个2 m×2 m的样方,对群丛和样方内的所有植株进行编号并测量胸径。我们为每个物种设置了10或20个凋落物收集器来收集凋落物。在12个月的时间里,每月对死亡和新生的群丛进行一次调查。I.sinica的地上生物量(AGB)最大(59.87 Mg ha^(-1)),而C.virgatum的AGB最小(11.54 Mg ha^(-1)),并且大多都低于全球竹子AGB的范围(32-256 Mg ha^(-1))。研究区多个竹种的同域分布可能抑制了本文所研究的五种竹种中的四种的AGB。地上的NPP估计值在3.43到14.25 Mg ha^(-1) yr^(-1)之间;这个值在D.membranaceus(8.20 Mg ha^(-1) yr^(-1))和I.sinica(14.25 Mg ha^(-1) yr^(-1))中,分别与温带常绿森林(8.78 Mg ha^(-1) yr^(-1))和热带湿润森林(10.56 Mg ha^(-1) yr^(-1))的全球平均估计值相当。较高的群丛新生率(15.20-23.39%yr^(-1))是地上NPP估计值的主要贡献因素。新竹丛的物候特征对地上NPP的季节模式影响很大。在四种合轴分枝的竹子中,随着持续降雨的开始,新的竹丛开始出现,主要在7月和8月。然而,在单轴分枝的I.sinica中,新竹丛随着温度的上升开始萌芽,主要在3月和4月。因此,我们的结果表明,竹子在老挝北部具有相当大的固碳潜力,但这种潜力可能受到气候变化的影响。 展开更多
关键词 竹林 固碳 茎动力学 凋落物 老挝北部 季节性
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