Soil breathing
As soil respiration which is collectively respiration of the microorganisms in the soil ( Microbial respiration ) and the roots, respectively. The contribution of root respiration is estimated to be less than 30%, the contribution of microbes to at least 70% and the proportion of soil animals to be very low. In hydroponic systems exist little microbes because dominates the root respiration (thanks to the root respiration can plant roots absorb nutrients).
As with every breathing process, oxygen (O 2 ) is absorbed and carbon dioxide (CO 2 ) is given off. In general, the carbon dioxide produced is used as a measure of soil respiration. Thus, the soil respiration is an important component of the carbon cycle is because a large proportion of the plants by running through it photosynthesis captured carbon after the death of the plants again as carbon dioxide into the atmosphere is emitted.
Soil respiration is dependent on many factors, including soil temperature and moisture , the amount of organic matter present and the mineral content in the soil. Climate-related changes in soil respiration over the course of the year often clearly outweigh the influence of other factors (e.g. fertilizers or pesticides).