Microbial competition for nitrogen and carbon is as intense in the subsoil as in the topsoil

摘要: Abstract Most studies on plant nutrition tend to focus the topsoil (plough layer) and frequently neglect subsoil processes. However, cereal roots can potentially acquire nutrients including organic inorganic nitrogen (N) from deep in soil profile. Greater knowledge interaction of plants microbes environments is required evaluate whether rooting traits cereals will achieve greater nutrient use efficiency carbon (C) storage cropping systems. This study aimed relationship between root distribution, N availability potential supply at critical growth period during wheat cycle a sand textured Eutric Cambisol. Our results provide evidence significant microbial capacity subsoil. The rate residue turnover mineralization C substrates (glucose, amino acids, peptides, protein) declined slightly with increasing depth; however, these rates were not correlated basal respiration, biomass or community structure. suggests that population more limited but its activity be readily stimulated upon substrate addition. A for was also demonstrated depth similar abundance ammonifiers ammonia oxidizing bacteria (AOB) archaea (AOA) throughout Again, subsoils appears limited. Root density rapidly down profile few present past 50 cm; suggesting this major factor limiting recharge matter subsoils. proliferation could allow capture water recapture lost by leaching; our suggest plant-microbial competition as intense topsoil. We conclude while deeper may improve it lead much sequestration subsoils, least short term.