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N2 O排放的主要来源之一。拟议项目的目标是揭示N2 O排放背后复杂的微生物介导的过程-即土壤微生物群落的组成，分布，特别是活性-取决于不同的灌溉-施肥制度。灌溉技术和氮肥施肥制度影响土壤中水和氮的时空分布，因此预计会影响产生N2 O的微生物种群。该项目结合农艺学和微生物调查以及N2 O排放量测量，对马铃薯种植系统进行了喷灌、滴灌、施肥和非灌溉的田间试验。确定与区域和产品相关的N2 O累积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.