The global potential of bioenergy on abandoned agriculture lands
The global potential of bioenergy on abandoned agriculture lands
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DOI：
10.1021/es800052w
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发表时间：
2008-08-01
影响因子：
11.4
通讯作者：
Field, Christopher B.
中科院分区：
文献类型：
--
作者：
Campbell, J. Elliott;Lobell, David B.;Field, Christopher B.
将林地转化为生物能源农业可能会释放森林中储存的碳，从而加速气候变化，而将粮食农业用地转化为生物能源农业可能会威胁粮食安全。通过利用废弃农田进行生物能源农业，这两个问题都有可能避免。根据历史土地利用数据、卫星获取的土地覆盖数据和全球生态系统模型，我们发现全球废弃农业用地上的生物能源潜力不到当前一次能源需求的8%。据估计，全球废弃农业的面积为3.85 - 4.72亿公顷，占先前初步评估报告面积的66-110%。地面生物量的面积加权平均产量为4.3吨/公顷/年，而以前的评估估计为10吨/公顷/年。在100%的废弃农业土地上生长的潜在生物质的能量含量不到北美，欧洲和亚洲大多数国家一次能源需求的10%，但它代表了一些非洲国家的能源需求的许多倍，这些国家的草原相对多产，目前的能源需求较低。
Converting forest lands into bioenergy agriculture could accelerate climate change by emitting carbon stored in forests, while converting food agriculture lands into bioenergy agriculture could threaten food security. Both problems are potentially avoided by using abandoned agriculture lands for bioenergy agriculture. Here we show the global potential for bioenergy on abandoned agriculture lands to be less than 8% of current primary energy demand, based on historical land use data, satellite-derived land cover data, and global ecosystem modeling. The estimated global area of abandoned agriculture is 385-472 million hectares, or 66-110% of the areas reported in previous preliminary assessments. The area-weighted mean production of above-ground biomass is 4.3 tons ha(-1) Y-1, in contrast to estimates of up to 10 tons ha(-1) Y-1 in previous assessments. The energy content of potential biomass grown on 100% of abandoned agriculture lands is less than 10% of primary energy demand for most nations in North America, Europe, and Asia, but it represents many times the energy demand in some African nations where grasslands are relatively productive and current energy demand is low.