如果靠近地面,你看到的土地往往呈现棕色。那么,这种棕色是从哪里来的呢?美国科学家最近发现,大地的棕色其实来自于绿色植物。美国加利福尼亚大学尔湾分校的生态学者斯蒂文·艾里森指出,植物枯萎和死亡后,叶子和枝干就会脱落,继而将它们长期以来为生存而储存的碳元素带给了土壤。 The land you see tends to be brown if you are near the ground. So where does this brown come from? American scientists recently discovered that the earth’s brown actually came from green plants. Steven Allison, an ecologist at the University of California, Irvine, points out that after the plants have wilted and died, the leaves and stems fall off and, in turn, bring to the soil the carbon they have long stockpiled for survival.