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                  <date type="start">2015-07-07</date>
                  <date type="end">2015-07-10</date>
                  <settlement>Paris</settlement>
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              <p>Soils contain the largest C terrestrial pool and even small  changes  in  soil  organic  C  (SOC)  can  have  a  significant  impact on the atmospheric CO2 concentration.  t he C cycle  feedback to climate will largely depend, in magnitude  and timing, on the response of soil C to climate changes.  However, there is still considerable uncertainty regarding  such effects. While the effect of temperature on soil C mineralization  has been the subject of much work and considerable  debate, much less attention has been paid to the effect  of changes in water regime, another predicted component  of climate change. However, soil moisture has a key role  in regulating soil respiration. Here, we synthesise work  regarding the relation between soil moisture and soil C  dynamics, focusing on the underlying mechanisms, on  the interaction with soil properties and other components  of global changes, and discuss how mechanisms and the  complexity of soils can be integrated into models. t he effect of soil moisture is complex to predict because,  unlike that of temperature, it is strongly dependent on  soil characteristics.  s oil moisture effect on heterotrophic  respiration is represented in most current carbon cycle  models by empirical functions, which are often based on  limited  experimental  data.  We  performed  a  data-driven  analysis of soil moisture respiration relations and showed  how these are consistently affected by soil properties  such as clay content, organic C content, bulk density.  We developed empirical models including the effects of  soil texture, soil organic carbon and bulk density which  improve the functions currently used in different soil  biogeochemical models. p artially responsible for the present state of knowledge  may be the idea that, in biogeochemical models, time-  and spatially averaged or approximate relationship of  microbial  activity  with  moisture  is  sufficient  to  reliably  predict C fluxes. But soil microorganisms live in a complex  3-D framework of mineral and organic particles defining  pores of various sizes, more or less inter-connected,  which result in a variety of microhabitats. Most promising  perspectives in this area are based on mechanistic  approaches, where theoretical linkages between substrate  and gas diffusivity in soil pores and heterotrophic  respiration are explored in different soil matrices.  a  new  generation of biogeochemical models is based on an  explicit representation of soil architecture at a fine scale,  which provides in-depth mechanistic understanding,  and  should  help  to  define  relevant  descriptors  of  soil  characteristics to improve how larger scale models account  for the effects of soil moisture.   t he complex interplay between biological, biogeochemical  and physical processes is apparent when considering the  variability of soil C storage upon a widely used cropping  practice: not tillage, where soil moisture also regulates  the flows of C between soil litter and mineral layers.  The  interactions between soil moisture and other components  of global change, i.e. land use, cropping practices,  temperature, will also result in biogeochemical feedbacks to climate change.</p>
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