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Synergic hydraulic and nutritional feedback mechanisms control surface patchiness of biological soil crusts on tertiary sands at a post-mining site

In: Journal of Hydrology and Hydromechanics, vol. 62, no. 4
Thomas Fischer - Stella Gypser - Maria Subbotina - Maik Veste

Details:

Year, pages: 2014, 293 - 302
Keywords:
Recultivation; Pyrite weathering; Bistable ecosystems.
Original source URL: http://www.ih.savba.sk/jhh
About article:
In a recultivation area located in Brandenburg, Germany, five types of biocrusts (initial BSC1, developed BSC2 and BSC3, mosses, lichens) and non-crusted mineral substrate were sampled on tertiary sand deposited in 1985–1986 to investigate hydrologic interactions between crust patches. Crust biomass was lowest in the non-crusted substrate, increased to the initial BSC1 and peaked in the developed BSC2, BSC3, the lichens and the mosses. Water infiltration was highest on the substrate, and decreased to BSC2, BSC1 and BSC3. Non-metric multidimensional scaling revealed that the lichens and BSC3 were associated with water soluble nutrients and with pyrite weathering products, thus representing a high nutrient low hydraulic feedback mode. The mosses and BSC2 represented a low nutrient high hydraulic feedback mode. These feedback mechanisms were considered as synergic, consisting of run-off generating (low hydraulic) and run-on receiving (high hydraulic) BSC patches. Three scenarios for BSC succession were proposed. (1) Initial BSCs sealed the surface until they reached a successional stage (represented by BSC1) from which the development into either of the feedback modes was triggered, (2) initial heterogeneities of the mineral substrate controlled the development of the feedback mode, and (3) complex interactions between lichens and mosses occurred at later stages of system development.
How to cite:
ISO 690:
Fischer, T., Gypser, S., Subbotina, M., Veste, M. 2014. Synergic hydraulic and nutritional feedback mechanisms control surface patchiness of biological soil crusts on tertiary sands at a post-mining site. In Journal of Hydrology and Hydromechanics, vol. 62, no.4, pp. 293-302. 0042-790X (until 2019) .

APA:
Fischer, T., Gypser, S., Subbotina, M., Veste, M. (2014). Synergic hydraulic and nutritional feedback mechanisms control surface patchiness of biological soil crusts on tertiary sands at a post-mining site. Journal of Hydrology and Hydromechanics, 62(4), 293-302. 0042-790X (until 2019) .