Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009
Drought-Induced Reduction in Global Terrestrial Net Primary Production from 2000 Through 2009
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DOI：
10.1126/science.1192666
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发表时间：
2010-08-20
期刊：
影响因子：
56.9
通讯作者：
Running, Steven W.
中科院分区：
文献类型：
--
作者：
Zhao, Maosheng;Running, Steven W.
陆地净初级生产力（NPP）量化了植物固定并积累为生物量的大气碳的数量。先前的研究表明，随着温度和太阳辐射的增加，气候约束正在放松，从而使NPP从1982年到1999年呈上升趋势。过去十年（2000年至2009年）是仪器测量开始以来最热的十年，这可能意味着NPP持续增加;然而，我们的估计表明全球NPP减少了0.55 petagram的碳。大规模的干旱减少了区域NPP，南半球的干燥趋势减少了该地区的NPP，抵消了北方半球NPP的增加。净初级生产力的持续下降不仅会削弱陆地碳汇，而且还会加剧未来粮食需求与拟议的生物燃料生产之间的竞争。
Terrestrial net primary production (NPP) quantifies the amount of atmospheric carbon fixed by plants and accumulated as biomass. Previous studies have shown that climate constraints were relaxing with increasing temperature and solar radiation, allowing an upward trend in NPP from 1982 through 1999. The past decade (2000 to 2009) has been the warmest since instrumental measurements began, which could imply continued increases in NPP; however, our estimates suggest a reduction in the global NPP of 0.55 petagrams of carbon. Large-scale droughts have reduced regional NPP, and a drying trend in the Southern Hemisphere has decreased NPP in that area, counteracting the increased NPP over the Northern Hemisphere. A continued decline in NPP would not only weaken the terrestrial carbon sink, but it would also intensify future competition between food demand and proposed biofuel production.