CARBON POOLS AND FLUX OF GLOBAL FOREST ECOSYSTEMS
CARBON POOLS AND FLUX OF GLOBAL FOREST ECOSYSTEMS
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DOI：
10.1126/science.263.5144.185
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发表时间：
1994-01-14
期刊：
影响因子：
56.9
通讯作者：
WISNIEWSKI, J
中科院分区：
文献类型：
--
作者：
DIXON, RK;BROWN, S;WISNIEWSKI, J
森林系统覆盖地球陆地面积的4.1x10（9）公顷以上。在全球范围内，森林植被和土壤含有约1146拍克的碳，其中约37%的碳在低纬度森林，14%在中纬度，49%在高纬度。森林生态系统中三分之二以上的碳存在于土壤和相关的泥炭沉积物中。1990年，低纬度地区的森林砍伐每年排放1.6 +/- 0.4拍德拉克的碳，而中纬度和高纬度森林的森林面积扩张和增长每年封存0.7 +/- 0.2拍德拉克的碳，每年向大气的净通量为0.9 +/- 0.4拍德拉克的碳。减缓森林砍伐，加上增加造林和其他管理措施以提高森林生态系统的生产力，可以保护或隔离大量的碳。与全球气候和土地使用变化有关的森林损失和再生所导致的未来森林碳循环趋势尚不确定。模型预测和一些结果表明，森林今后可能成为碳汇或碳源。
Forest systems cover more than 4.1 x 10(9) hectares of the Earth's land area. Globally, forest vegetation and soils contain about 1146 petagrams of carbon, with approximately 37 percent of this carbon in low-latitude forests, 14 percent in mid-latitudes, and 49 percent at high latitudes. Over two-thirds of the carbon in forest ecosystems is contained in soils and associated peat deposits. In 1990, deforestation in the low latitudes emitted 1.6 +/- 0.4 petagrams of carbon per year, whereas forest area expansion and growth in mid- and high-latitude forest sequestered 0.7 +/- 0.2 petagrams of carbon per year, for a net flux to the atmosphere of 0.9 +/- 0.4 petagrams of carbon per year. Slowing deforestation, combined with an increase in forestation and other management measures to improve forest ecosystem productivity, could conserve or sequester significant quantities of carbon. Future forest carbon cycling trends attributable to losses and regrowth associated with global climate and land-use change are uncertain. Model projections and some results suggest that forests could be carbon sinks or sources in the future.