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首页> 美国卫生研究院文献>Proceedings of the National Academy of Sciences of the United States of America >Climate Mitigation and Food Production in Tropical Landscapes Special Feature: Trading carbon for food: Global comparison of carbon stocks vs. crop yields on agricultural land
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Climate Mitigation and Food Production in Tropical Landscapes Special Feature: Trading carbon for food: Global comparison of carbon stocks vs. crop yields on agricultural land

机译：热带景观中的气候减缓和粮食生产特点：以粮食换碳：全球农业土地上的碳储量与农作物产量的全球比较

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摘要

Expanding croplands to meet the needs of a growing population, changing diets, and biofuel production comes at the cost of reduced carbon stocks in natural vegetation and soils. Here, we present a spatially explicit global analysis of tradeoffs between carbon stocks and current crop yields. The difference among regions is striking. For example, for each unit of land cleared, the tropics lose nearly two times as much carbon (∼120 tons·ha−1 vs. ∼63 tons·ha−1) and produce less than one-half the annual crop yield compared with temperate regions (1.71 tons·ha−1·y−1 vs. 3.84 tons·ha−1·y−1). Therefore, newly cleared land in the tropics releases nearly 3 tons of carbon for every 1 ton of annual crop yield compared with a similar area cleared in the temperate zone. By factoring crop yield into the analysis, we specify the tradeoff between carbon stocks and crops for all areas where crops are currently grown and thereby, substantially enhance the spatial resolution relative to previous regional estimates. Particularly in the tropics, emphasis should be placed on increasing yields on existing croplands rather than clearing new lands. Our high-resolution approach can be used to determine the net effect of local land use decisions.
机译：扩大耕地以满足不断增长的人口的需求，改变饮食结构和生产生物燃料的代价是以减少天然植被和土壤中碳储量为代价。在这里，我们对碳储量与当前农作物产量之间的取舍进行了空间明确的全局分析。地区之间的差异是惊人的。例如，对于每单位清理过的土地，热带地区的碳损失几乎是其两倍（约120吨·ha -1 与63吨·ha -1 ），而与温带地区（1.71吨·ha -1 ·y -1 ）相比，年产量不到一半，而3.84吨·ha -1 ·y -1 ）。因此，与温带地区类似的清理区域相比，热带地区新开垦的土地每生产1吨年作物就释放近3吨碳。通过将作物产量纳入分析中，我们指定了当前种植作物的所有地区的碳储量与作物之间的权衡，从而相对于先前的区域估计值，大大提高了空间分辨率。特别是在热带地区，应着重于增加现有耕地的单产，而不是开垦新土地。我们的高分辨率方法可用于确定当地土地使用决策的净效果。

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