Agricultural sources and sinks of carbon
Agricultural sources and sinks of carbon
复制标题
DOI：
10.1007/978-94-011-1982-5_7
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
C. Cole;K. Flach;Jeffrey E. Lee;D. Sauerbeck;B. Stewart
中科院分区：
文献类型：
--
作者：
C. Cole;K. Flach;Jeffrey E. Lee;D. Sauerbeck;B. Stewart
大多数现有农田已经生产了足够长的时间，碳输入和输出几乎平衡，它们既不是大气碳的主要来源也不是大气碳汇。随着人口的增加，粮食需求和对更多耕地的需求相应增加。预计每年将有多达 1.5 × 107 公顷的未开垦土地被转化。正是这些新的农业用地在转变过程中和转变后遭受了最大的碳损失。分析农业生态系统中未来碳通量的主要重点需要放在当前土地利用和管理的变化以及二氧化碳和气候变化的直接影响上。对农业生态系统中碳库和通量的有效评估需要全球土壤数据库以及有关土地利用和管理实践的全面信息。迫切需要进行全面的努力来收集和分析这些信息。
Most existing agricultural lands have been in production for sufficiently long periods that C inputs and outputs are nearly balanced and they are neither a major source nor sink of atmospheric C. As population increases, food requirements and the need for more crop land increase accordingly. An annual conversion of previously uncultivated lands up to 1.5 × 107hectares may be expected. It is this new agricultural land which suffers the greatest losses of C during and subsequent to its conversion. The primary focus for analysis of future C fluxes in agroecosystems needs to be on current changes in land use and management as well as on direct effects of CO2and climate change. A valid assessment of C pools and fluxes in agroecosystems requires a global soils data base and comprehensive information on land use and management practices. A comprehensive effort to assemble and analyze this information is urgently needed.