@misc{MedinskiFreeseBoehmetal., author = {Medinski, Tanya V. and Freese, Dirk and B{\"o}hm, Christian and Slazak, Anna}, title = {Soil carbon fractions in short rotation poplar and black locust coppices, Germany}, series = {Agroforestry Systems}, volume = {88}, journal = {Agroforestry Systems}, number = {3}, issn = {1572-9680}, doi = {10.1007/s10457-014-9709-2}, pages = {505 -- 515}, abstract = {Short rotation coppice (SRC) is seen as a successful management system, which in addition to energy wood production may enhance soil carbon sequestration. The objective of this study was to investigate total, labile and stable soil carbon fractions at SRCs composed of poplar clones Max 1 (Populus nigra x P. maximowiczii), Muhle Larsen (Populus Trichocarpa), and black locust (Robinia pseudoacacia L.). Study was conducted at three SRC sites (Allendorf, Dornburg, and Forst) varying in age (1-4 years old), soil texture and climatic characteristics, in Germany. Composite soil samples collected at SRCs from 0 to 3; 0-10; 10-30; and 30-60 cm depth layers were compared with soils collected from adjacent crop strips. Samples were analysed for total organic carbon (TOC), hot-water extractable carbon (HWC), and organic carbon (OC) at 250-2,000; 53-250; and\53 lm soil-size aggregates. Total OC stocks in 0-60 cm soil layer were the highest at the site with the heaviest texture, Dornburg, followed by Forst and Allendorf, comprising 92-107; 59-74; and 53-64 Mg ha-1, respectively. Although no significant differences in the total OC stocks between SRCs and adjacent crops were found for the 0-60 cm layer, a significantly (p\0.05) higher TOC, HWC, OC at macroaggregates (250-2,000 lm), and the amount of macro-aggregates were found in the top 0-3 cm layer in all SRC sites (except the youngest poplar SRC in Forst) compared to adjacent crop strips. A greater macro-aggregate formation in SRCs related to the lower soil disturbance compared to the tilled crops, revealed a potential of SRC for C sequestration, as C occluded within soil aggregates has a slower decomposition rates and longer residence time.}, language = {en} } @misc{MatosFreeseMendoncaetal., author = {Matos, Eduardo da Silva and Freese, Dirk and Mendon{\c{c}}a, Eduardo S. and Slazak, Anna and H{\"u}ttl, Reinhard F.}, title = {Carbon, nitrogen and organic C fractions in topsoil affected by conversion from silviopastoral to different land use systems}, series = {Agroforestry Systems}, volume = {81}, journal = {Agroforestry Systems}, number = {3}, issn = {1572-9680}, pages = {203 -- 211}, language = {en} } @misc{MatosFreeseSlazaketal., author = {Matos, Eduardo da Silva and Freese, Dirk and Slazak, Anna and Bachmann, Ute and Veste, Maik and H{\"u}ttl, Reinhard F.}, title = {Organic-carbon and nitrogen stocks and organic-carbon fractions in soils under mixed pine and oak forest stands of different ages in NE Germany}, series = {Journal of plant nutrition and soil science}, volume = {173}, journal = {Journal of plant nutrition and soil science}, number = {5}, issn = {1522-2624}, pages = {654 -- 661}, language = {en} } @misc{SlazakFreeseMatosetal., author = {Slazak, Anna and Freese, Dirk and Matos, Eduardo da Silva and H{\"u}ttl, Reinhard F.}, title = {Soil organic phosphorus fraction in pine-oak forest stands in Northeastern Germany}, series = {Geoderma}, volume = {158}, journal = {Geoderma}, number = {3-4}, issn = {0016-7061}, pages = {156 -- 162}, language = {en} } @misc{SlazakFreeseMatosetal., author = {Slazak, Anna and Freese, Dirk and Matos, Eduardo da Silva and Nii-Annang, Seth and H{\"u}ttl, Reinhard F.}, title = {Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use}, series = {Journal of Plant Nutrition and Soil Science}, volume = {177}, journal = {Journal of Plant Nutrition and Soil Science}, number = {2}, issn = {1522-2624}, doi = {10.1002/jpln.201200334}, pages = {159 -- 167}, abstract = {Differences in soil P among silvopasture, grassland, and arable lands have been well established. Nevertheless, most of the reports compare soil properties under long-term sites. Thus, there exists little information on the effect of the conversion of silvopasture to arable or grassland use on soil P pools. The objective of the study was to determine the impact of converting silvopasture system (SP) into arable cropping and grassland system on the distribution of P pools and potential P bioavailability. We compared the following systems: SP system, SP converted to arable cropland (SP-AL), SP converted to grassland (SP-GL), and for comparative purposes, a long-term arable cropland (AL). The P fractionation was performed by a sequential extraction scheme, using acid and alkaline extractants on samples collected from the 0-10 and 10-20 cm soil layers. It was assumed that the large variations in soil-P fractionations are caused by the different management practices associated with land conversion. The results of P fractionation showed a dominance of calcium-bound P, HCl-extractable Pi constituted up to 36\% of the soil total P (TP). However, the type of land use did not affect this P fraction. On the other hand, the reduction in labile-Pi and NaOH-Pi fractions observed at the SP-AL site may have led to the decline in readily available P. The soil total organic P (TPo) content was 8\% and 17\% lower at SP-AL compared to SP and SP-GL site, respectively. Labile organic-P (labile-Po) content was markedly higher at SP site compared to arable soils, and was ≈ 10\% of TPo. The NaOH-Po constituted the highest fraction of the organic-P pool (55\%-79\% of TPo) across all the study systems, and was positively correlated with TPo (p < 0.01). The study indicates that conversion of SP system in temperate regions to arable cropping with conventional tillage seems to result in the reduction of P availability compared to SP, indicating SP as an important land-use practice.}, language = {en} } @inproceedings{GypserSlazakFreese, author = {Gypser, Stella and Slazak, Anna and Freese, Dirk}, title = {Impact of crystallization of iron and aluminium hydroxides on the mechanisms of phosphate binding}, series = {9th International Symposium on Ecosystem Behavior BIOGEOMON, Litomysl, Czech Republic, August 20-24, 2017}, booktitle = {9th International Symposium on Ecosystem Behavior BIOGEOMON, Litomysl, Czech Republic, August 20-24, 2017}, editor = {Nov{\´a}k, Martin and Kr{\´a}m, Pavel and Step{\´a}nov{\´a}, M.}, pages = {366 -- 367}, language = {en} }