期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 46, 页码 19645-19648出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1011078107
关键词
cropland expansion; deforestation; greenhouse gases; ecosystem services; land use change
资金
- National Aeronautics and Space Administration (NASA)
- Wisconsin Space Grant Consortium
- US Department of Energy
- Nature Conservancy
- Division Of Environmental Biology
- Direct For Biological Sciences [822700] Funding Source: National Science Foundation
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 (similar to 120 tons.ha(-1) vs. similar to 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据