1. Acea MJ, Diz N, Ferna’ndez AP (2001) Microbial populations in heated soils inoculated with cyanobacteria. Biol Fertil Soils 33:118–125
2. Aradottir AL, Arnalds O (2001) Ecosystem degradation and restoration of birch woodlands in Iceland. In: Wielgolaski FE (ed) Nordic mountain birch ecosystems. UNESCO, Paris and Parthenon Publishing, Carnforth, pp 295–308
3. Aradottir AL, Svavasdottir K, Jonsson XH, GuCbergsson G (2000) Carbon accumulation in vegetation and soils by reclamation of degraded areas. Icel Agric Sci 13:99–113
4. Asai H, Samson BK, Stephan HM, Songyikhangsuthor K, Homma K, Kiyono Y, Inoue Y, Shiraiwa T, Horie T (2009) Biochar amendment techniques for upland rice production in Northern Laos 1. Soil physical properties, Leaf SPAD and grain yield. Field Crop Res 111:81–84
5. Ashley J, Rushforth SR (1984) Growth of soil algae on top soil and processed oil shale from the Uintah Basin, Utah, U.S.A. Reclam Reveg Res 3:49–63