Gardeners know how a few key inputs can dramatically change the productivity of plants —timely additions of water and fertilizer, for instance, or the right soil conditions, can dramatically boost plant productivity.
Scientists seeking to understand what determines rates of plant growth in natural grasslands and rangelands have long focused on climatic conditions such as temperature and rainfall. However, in recent years a new suspect has emerged: nitrogen. The growth of fossil-fuel-based industrial activity, transportation and agriculture in recent decades has increased the amount of nitrogen traveling through the water and air around the world. One potential result is that areas that appear to be little impacted by human development and that are not being farmed can actually be fertilized from afar by these excess nutrients. Continue reading