INFLUENCE OF BLACK LOCUST (ROBINIA PSEUDOACACIA L.) SHELTERBELTS ON FRACTIONAL HUMUS COMPOSITION AND BIOCHEMICAL PROPERTIES OF ERODED LOESS SOIL
Journal Title: Folia Pomeranae Universitatis Technologiae Stetinensis Agricultura Alimentaria Piscaria et Zootechnica - Year 2016, Vol 39, Issue 328
Abstract
The purpose of the study was to investigate the impact of field shelterbelts on fractional humus composition and biochemical properties of loess soil in the area highly threatened by water erosion. To this end, soil samples were collected along three transects situated within 20-year-old black locust (Robinia pseudacacia L.) shelterbelts. The plantings were established in a loess micro-basin located on arable land. Shelterbelts 1 and 3 are located on the flat hilltop and run north-south whereas shelterbelt 2 is situated along the north-facing slope of 15% at the study site and runs west-east. Overall, 9 soil pits were dug: (i) 3 pits in the central part of each 5 m wide tree strip, and (ii) 6 pits in the adjacent arable fields, with 2 pits at a distance of 2 m and 20 m made for each of 3 plots, perpendicularly to the shelterbelt edges, west of shelterbelts 1 and 2, and south of shelterbelt 3. The shelterbelts had a significant influence on soil organic carbon sequestration and humification progress. Carbon contents of humic substances and fulvic acids as well as values of humic to fulvic acid ratios were higher in the soil under the locust trees than in the soil from the arable field. The carbon content of humic substances and fulvic acids decreased with increasing distance from the tree-planted sites. The increase in soil organic carbon levels in the soil from the shelterbelts led to positive changes in the activity of the enzymes studied (i.e. dehydrogenases, phosphatases, proteases, and urease) catalyzing the most important processes of soil organic matter transformations. Compared to the arable soil, the soil under Robinia pseudacacia had higher enzyme activities decreasing significantly with distance from the tree strips. This confirms a positive impact of agroforestry system on soil biology.
Authors and Affiliations
Barbara FUTA
Keywords
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