The trade-offs between milk production and soil organic carbon storage in dairy systems under different management and environmental factors

摘要: Abstract A possible agricultural climate change mitigation option is to increase the amount of soil organic carbon (SOC). Conversely, some factors might lead inadvertent losses SOC. Here, we explore effect various management options and environmental changes on SOC storage milk production dairy pastures in New Zealand. We used CenW 4.1, a process-based ecophysiological model, run range scenarios assess effects options, plant properties production. tested model by using 2 years observations exchanges water CO2 measured with an eddy covariance system farm Zealand's Waikato region. obtained excellent agreement between observations, especially for evapotranspiration net photosynthesis. For scenario analysis, found that could be increased through supplying supplemental feed, increasing fertiliser application, or availability irrigation very dry sites, but decreased again larger increases availability. Soil warming strongly reduced other key properties, such as water-holding capacity root:shoot ratios, were often negatively correlated The work showed determined complex interplay (1) primary production; (2) fraction taken off-site grazing; (3) allocation within labile stabilised SOC; (4) decomposition rates. There particularly important trade-off either being removed grazing remaining site available formation. Changes cannot fully understood unless all four are considered together overall assessment.