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
Keep your brain limber this summer by learning about cutting-edge solutions to the planet’s environmental grand challenges. During your down time, we invite you to watch video recordings of the Institute on the Environment’s Frontiers in the Environment series, a forum for experts from the University of Minnesota and other institutions to informally share their work on a wide-range of cutting-edge issues, wrapped up with a lively Q&A.
Browse the archives or choose from this list of nine, hand picked from nearly 40 talks. They are sure to enlighten and inspire! Continue reading
As land resources come under more and more pressure — to grow food, support cities and house valuable ecosystems — scientists, activists and others are on the hunt for better ways to manage the terrestrial biosphere. One strategy is to increase the efficiency of croplands and pasture lands, particularly in ecosystems such as the Amazon forest where converting more land to agricultural use is environmentally costly.
As the world’s largest contiguous tropical forest, Amazonia is an important store of carbon, provides habitat for biodiverse communities and plays a part in regulating the global water cycle.
Moreover, the Amazon is a prime candidate for exploring whether increasing efficiency can help make agricultural land use more sustainable. Recently, David Lapola of Universidade Estadual Paulista and colleagues pointed out in the journal Nature Climate Change that agriculture in Brazil, including Amazonia, is intensifying and becoming more dominated by commodity production, leading to systematic changes in land use. This intensification has been accompanied by lower rates of deforestation.