The CO&60; sub&62; 2&60;/sub&62; exchange of biological soil crusts in a semiarid grass-shrubland at the northern transition zone of the Negev desert, Israel Academic Article uri icon

abstract

  • Biological soil crusts (BSC) contribute significantly to the soil surface cover in many dryland ecosystems. A mixed type of BSC, which consists of cyanobacteria, mosses and cyanolichens, constitutes more than 60% of ground cover in the semiarid grass-shrub steppe at Sayeret Shaked in the northern Negev Desert, Israel. This study aimed at parameterizing the carbon sink capacity of well-developed BSC in undisturbed steppe systems. Mobile enclosures on permanent soil borne collars were used to investigate BSC- related CO&60; sub&62; 2&60;/sub&62; fluxes in situ and with natural moisture supply during 10 two-day field campaigns within seven months from fall 2001 to summer 2002. Highest BSC-related CO&60; sub&62; 2&60;/sub&62; deposition between–11.31 and–17.56 mmol m&60; sup&62; &minus&59; 2&60;/sup&62; per 15 h was found with BSC activated …

publication date

  • January 1, 2008