Department of Geography and Environment, Boston University, Boston, MA 02215, USA.
Science. 2011 Aug 26;333(6046):1093; author reply 1093. doi: 10.1126/science.1199048.
Zhao and Running (Reports, 20 August 2010, p. 940) reported a reduction in global terrestrial net primary production (NPP) from 2000 through 2009. We argue that the small trends, regional patterns, and interannual variations that they describe are artifacts of their NPP model. Satellite observations of vegetation activity show no statistically significant changes in more than 85% of the vegetated lands south of 70°N during the same 2000 to 2009 period.
赵和润（报道，2010 年 8 月 20 日，第 940 页）报告称，2000 年至 2009 年期间，全球陆地净初级生产力（NPP）有所减少。我们认为，他们所描述的这种小趋势、区域模式和年际变化是其 NPP 模型的人为产物。对植被活动的卫星观测显示，在 2000 年至 2009 年期间，北纬 70°以南的 85%以上的植被地区没有出现统计学上显著的变化。
