Assessing land use change trajectories following food insecurity shocks in 25 low- and middle-income countries
研究了2013-2020年间25个低收入和中等收入国家粮食不安全事件对土地利用和人口的影响，发现粮食不安全导致人口和耕地面积下降、森林覆盖增加，并推动农村向城市迁移。
• The impacts of food insecurity shocks on land use are empirically tested and explored using land use change theory. • Food insecurity shocks lead to a decline in population and cropland as well as an increase in forest cover. • Underlying drivers of food insecurity mediate land use outcomes via changes in labor availability and land productivity. • The influence of regional livelihoods and land arrangements are also explored through three case studies. Food insecurity is a perennial problem in much of the developing world, with gains against hunger backsliding in recent years and climate change predicted to accelerate this trend. Food insecurity is highly disruptive to rural livelihoods and can lead to dramatic shifts in food production strategies and resultant land use. However, studies to date have yet to outline the overarching patterns of land use change that can result from food insecurity. We elucidate the impact of food insecurity events between 2013 and 2020 in 25 low- and middle-income countries on resulting land use change and demographics. Using propensity score matching, we create a counterfactual and assess changes in forest cover, crop cover, population and nighttime luminosity between regions that experience food insecurity and comparable food-secure regions. Land use change theory, specifically the classical trajectories of agricultural intensification, land rent theory, and regime shifts help to explain observed land use trajectories. We find that food insecurity events lead to around a 4 % decline in population and a 3 % decline in cropped areas, alongside a 4 % increase in forest cover compared to control regions. Additionally, we show that drought-driven food insecurity drives impacts on land use and conflict-driven food insecurity shows greater impacts on population and nighttime luminosity. Food insecurity shocks result in an increase in population and crop cover in urban areas despite losses in adjoining rural land, suggesting that food insecurity drives local rural to urban migration. Furthermore, by assessing the impacts of discrete food insecurity events in three countries, we find that regional contexts mediate impacts by producing variable land use change trajectories.