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Agriculture contributes to global warming mainly through the emission of methane and nitrous oxide. Nitrous oxide is particularly important, as it accounts for a significant share of total nitrogen emissions from arable land It is produced as a result of anaerobic microbiological changes of nitrogen introduced into the soil along with mineral fertilizers. Changes in weather patterns in response to climate change may significantly affect the efficiency of fertilizer nitrogen in agriculture, and, consequently, entail undesirable environmental effects. This issue is of particular importance in view of the dominant role that this fertilizer element plays in agriculture, and, on the other hand, due to the global environmental risk within the “nitrogen cycle”. The analysis, carried out in this paper indicates, that transformations of nitrogen compounds in the soil, caused predominantly by the climate condition, result in nitrogen release from the agricultural production area. The dispersion in the form of molecular nitrogen (N2) is mainly the result of denitrification processes. By this way over 50% of nitrogen lost from agriculture is dissipated from the agricultural land. From the agricultural point of view, denitrification is a process that limits the resources of available nitrogen, but from the environmental viewpoint, this process should be considered as a natural mechanism of environmental self-purification and water protection. Although it constitutes only about 25% of the total loss of this element the dilution of nitrogen from agricultural areas by leaching, is considered to be the most cumbersome for the water environment. [ABSTRACT FROM AUTHOR]

[Display omitted] • Droughts and floods are increasing worldwide. • Changes in soil moisture affect the soil microbiome. • Climate change affects the soil environment. • Changes in the soil environment affect crop production. • Drought and floods have a negative impact on agriculture. Climate change is progressing and is already visible to the naked eye around the world. Hydrological events associated with climate change, i.e. floods and droughts, have reached extreme levels in recent years. Researchers warn that these phenomena will continue to intensify. According to recent reports, the number of extreme weather events, including hydrological phenomena, has increased by 60% in Europe over the last three decades. Both water shortages and water surpluses affect the soil environment and its functions. This in turn has a direct impact on crops and agriculture. For example, in the US alone, droughts and floods were responsible for more than 70% of the decline in cereal yields in 2011 alone. However, the soil environment is a complex ecosystem that is not yet fully understood, making it difficult to predict the impact of climate change on its quality and functioning. In this paper, we discuss the effects of floods and droughts on the soil microbiome and the implications of these changes for agriculture. We suggest that changes in soil moisture are an important factor affecting crop growth and yield, which is of great importance for global food security. [ABSTRACT FROM AUTHOR]

The impacts of agricultural land use are far-reaching and extend to areas outside production. This paper provides an overview of the ecological status of agricultural systems across the European Union in the light of recent policy changes. It builds on the previous review of 2001 devoted to the impacts of agricultural intensification in Western Europe. The focus countries are the UK, The Netherlands, Boreal and Baltic countries, Portugal, Hungary and Romania, representing a geographical spread across Europe, but additional reference is made to other countries. Despite many adjustments to agricultural policy, intensification of production in some regions and concurrent abandonment in others remain the major threat to the ecology of agro-ecosystems impairing the state of soil, water and air and reducing biological diversity in agricultural landscapes. The impacts also extend to surrounding terrestrial and aquatic systems through water and aerial contamination and development of agricultural infrastructures (e.g. dams and irrigation channels). Improvements are also documented regionally, such as successful support of farmland species, and improved condition of watercourses and landscapes. This was attributed to agricultural policy targeted at the environment, improved environmental legislation, and new market opportunities. Research into ecosystem services associated with agriculture may provide further pressure to develop policy that is targeted at their continuous provisioning, fostering motivation of land managers to continue to protect and enhance them. [Copyright &y& Elsevier]