**Acknowledgements**

To V. Alejandro Deregibus, the director of my master's degree, for his teaching and support; to Roberto Distel, for having helped me, discussing ideas with me, to Natalia *Why Are Moss Biocrusts Necessary for System Conservation in a Semiarid Region of Southern… DOI: http://dx.doi.org/10.5772/intechopen.106746*

Villasuso, for having always collaborated in the field work. Many of these trials were carried out with financial aid from CONICET (National Council of Scientific Research) and the National University of Comahue.
