Soils constitute one of the most valuable resources on earth, especially because soil is
renewable on human time scales. During the 20th century, a period marked by a …

Ammonia emissions from the agricultural sector give rise to numerous environmental and
societal concerns and represent an economic challenge in crop farming, causing a loss of …

Luyssaert et al. 1 reported that unmanaged, old-growth forests continue to sequester
atmospheric carbon (C) at a rate of 2.4±0.8 Mg C ha–1 yr–1 for stand ages exceeding 200 …

Gaseous ammonia (NH 3) is the most abundant alkaline gas in the atmosphere. In addition,
it is a major component of total reactive nitrogen. The largest source of NH 3 emissions is …

The availability of carbon (C) from high levels of atmospheric carbon dioxide (CO2) and
anthropogenic release of nitrogen (N) is increasing, but these increases are not paralleled …

We explore the role of lakes in carbon cycling and global climate, examine the mechanisms
influencing carbon pools and transformations in lakes, and discuss how the metabolism of …

This paper contrasts the natural and anthropogenic controls on the conversion of unreactive
N 2 to more reactive forms of nitrogen (Nr). A variety of data sets are used to construct global …

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Tropospheric ozone (O3) is an important stressor in natural ecosystems, with well‐
documented impacts on soils, biota and ecological processes. The effects of O3 on …

Nitrogen (N) and phosphorus (P) availability limit plant growth in most terrestrial ecosystems.
This review examines how variation in the relative availability of N and P, as reflected by N …