The climate impact of land use change in the miombo region of south central Africa

IF 2.6 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Sally A. Wilson, R. Scholes
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引用次数: 5

Abstract

ABSTRACT The African woodlands known as miombo are one of the world’s largest currently relatively unexploited, but potentially arable, land resources. Miombo landscapes one of the top contemporary locations of conversion of dry forests to crop agriculture. This study investigates the net effect on climate forcing that results from different types of land use change in miombo, taking into account the multiple mechanisms through which the land interacts with the climate system, locally and globally. It finds that when miombo is converted tointensively cultivated commercial crops, the landscape-averaged 30-year net greenhouse gas forcing relative to intact woodlands is 309gCO2e m-2 y-1, of which net emission of carbon dioxide amount to 66%, non-CO2 greenhouse gas effects to 33%, plus unquantified contributions from ozone precursors and aerosols. We find that net brightening of the land surface resulting from clearing the woodlands generates a cooling effect larger than the greenhouse gas forcing (-1139gCO2e m-2 y-1). Greenhouse gas forcings resulting from transformation to extensive subsistence agriculture that are 78% lower than those from the intensive commercial agriculture path, and 40% lower if a transformation which sets out to mimic ecological processes in the miombo landscape is undertaken. Once the effect of surface brightening is included, then the total forcing for extensive subsistence agriculture is -834gCO2e m-2 y-1 , about the same as intensive commercial, and eco-agriculture is -102gCO2e m-2 y-1 . Taking into account the account the larger areas required for to achieve the same production, intensive commercial agriculture is the more climate-protective option.Keywords: greenhouse gas, net radiation, deforestation.
非洲中南部miombo地区土地利用变化对气候的影响
被称为miombo的非洲林地是目前世界上最大的尚未开发但具有潜在可耕地的土地资源之一。Miombo景观是当代干旱森林转化为农作物农业的最佳地点之一。考虑到土地与气候系统在当地和全球范围内相互作用的多种机制,本研究调查了不同类型的土地利用变化对气候强迫的净效应。研究发现,当水稻转化为集约种植的商业作物时,相对于完整林地,景观平均30年净温室气体强迫为309gCO2e m-2 y-1,其中二氧化碳净排放量占66%,非二氧化碳温室气体效应占33%,再加上臭氧前体和气溶胶的未量化贡献。我们发现,清除林地导致的地表净增白产生的冷却效应大于温室气体强迫(-1139gCO2e m-2 y-1)。向粗放型自给农业转型所产生的温室气体强迫比从集约化商业农业转型所产生的温室气体强迫低78%,如果在miombo景观中进行模拟生态过程的转型,则会降低40%。如果考虑地表增白化的影响,则粗放自给农业的总强迫为-834gCO2e m-2 y-1,与集约化商业大致相同,生态农业的总强迫为-102gCO2e m-2 y-1。考虑到实现相同产量所需的面积更大,集约化商业农业是更保护气候的选择。关键词:温室气体,净辐射,森林砍伐。
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来源期刊
CiteScore
3.90
自引率
0.00%
发文量
13
审稿时长
>12 weeks
期刊介绍: Journal of Integrative Environmental Sciences (JIES) provides a stimulating, informative and critical forum for intellectual debate on significant environmental issues. It brings together perspectives from a wide range of disciplines and methodologies in both the social and natural sciences in an effort to develop integrative knowledge about the processes responsible for environmental change. The Journal is especially concerned with the relationships between science, society and policy and one of its key aims is to advance understanding of the theory and practice of sustainable development.
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