【保护土壤多样性】Michael Tennesen*†. Rare earth.  Science 7 November 2014: Vol. 346 no. 6210 pp. 692-695 DOI: 10.1126-science.346.6210.692

Abstract

In the southeastern United States the Cecil soil—a yellowish topsoil underlain by layers of sticky red clay—is a regional icon. It's North Carolina's state soil. But the Cecil is also increasingly endangered by farming and development. Endangered dirt? Not that long ago few researchers would have talked up the idea. But in recent years efforts to identify the world's rare and endangered soils have been gaining momentum. Aided by increasingly powerful geographic information systems and Earth-observing sensors researchers have begun mapping "pedodiversity"—the distribution and extent of different soils. This past summer for example Chinese researchers released the first-ever pedodiversity survey of that huge nation identifying nearly 90 endangered soils—as well as at least two dozen that have already gone extinct. Similar surveys suggest unique dirt is also in danger in the United States Europe and Russia. And just as biologists have stepped up efforts to protect biodiversity soil scientists are now trying to call attention to the need to preserve pedodiversity.

【大气二氧化碳含量随农产量升高的季节性变化受人类直接影响】Josh M. Gray Steve Frolking Eric A. Kort Deepak K. Ray Christopher J. Kucharik Navin Ramankutty