Global Tree Cover and Biomass Carbon on Agricultural Land : The contribution of agroforestry to global and national carbon budgets Arctic foxes as ecosystem engineers : increased soil nutrients lead to increased plant productivity on fox dens

Zomer, R. J., Gharajehdaghipour, T., Roth, J. D., Fafard, P. M., & Markham, J. H. (2016). Global Tree Cover and Biomass Carbon on Agricultural Land : The contribution of agroforestry to global and national carbon budgets Arctic foxes as ecosystem engineers : increased soil nutrients lead to increased plant productivity on fox dens. Nature Publishing Group, (August). Retrieved from http://dx.doi.org/10.1038/srep24020