N2O emissions as response of process-related soil microbial activity to different irrigation and nitrogen fertilization regimes in potato cropping

农业土壤是N2O排放的主要来源之一。拟建项目的目的是揭示N2O排放背后复杂的微生物介导过程，即土壤微生物群落的组成、分布和活动，这取决于不同的灌溉施肥制度。灌溉技术和施氮制度影响土壤中水分和氮的时空分布，因此预计会影响产生N2O的微生物种群。该项目结合了农艺和微生物调查以及一氧化二氮排放测量，对马铃薯种植系统进行了田间试验，采用喷灌、滴灌、施肥和不灌溉。确定与面积和产品有关的累积一氧化二氮排放量以及主要的物理、化学和生物因素，以得出适当的管理战略。

Agricultural soils are one of the main sources of N2O emissions. The objective of the proposed project is to reveal the complex microbial-mediated processes behind N2O emissions – i.e. composition, distribution and especially activity of the soil-inhabiting microbial community - depending on different irrigation-fertilization regimes. Irrigation technologies and N fertilization regimes influence the spatial and temporal distribution of water and N in the soil and are hence expected to affect N2O producing microbial populations. The project combines agronomic and microbial investigations and N2O emissions measurements in a field experiment with a potato cropping system under sprinkling, drip irrigation, fertigation and non-irrigation. Cumulative area- and product-related N2O emissions and the major physical, chemical and biological factors are determined to derive appropriate management strategies.