Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
Abstract (EDOC: 14258)
The impact of alley cropping on post lignite mine soils developing from quaternary deposits after 9 years of recultivation was evaluated on the basis of microbial indicators, organic C and total N contents, and the isotope characteristics of soil C. Soils were sampled at 0 3, 3 10 and 10 30 cm depths under black locust (Robinia pseudoacacia L.), poplar clone (Populus spp.), and the transition zone and the middle of alley under rye (Secale cereale). There was no significant vegetation effect on microbial properties probably, due to the high variability, whereas organic 418 C and total N contents at the 0 3 cm layer were significantly higher under black locust and poplar than in the transition zone and rye field. Organic C and total N contents, basal respiration, microbial biomass and microbial quotient decreased with soil depth. Soil organic C and total N contents more than doubled after 9 years of recultivation, with an annual C and N accretion rate of 162 g Corg m-2 year-1 and 6 g Nt m-2 year-1. The values of microbial properties indicated that the soils are in early stages of development; the C isotope characteristics confirmed that the sequestered C was predominantly from C3 plants of the alley-cropping systems.
(2009): Microbial activity, organic C accumulation and 13C abundance in soils under alleycropping systems after 9 years of recultivation of quaternary deposits. Book of Abstracts : 2nd World Congress of Agroforestry ; Agroforestry - The Future of Global Land Use, 23-28 August 2009 Nairobi, Kenya, 2nd World Congress of Agroforestry (Nairobi 2009), 417-418.