TY - GEN A1 - Medinski, Tanya V. A1 - Freese, Dirk A1 - Böhm, Christian A1 - Slazak, Anna T1 - Soil carbon fractions in short rotation poplar and black locust coppices, Germany T2 - Agroforestry Systems N2 - 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. Y1 - 2014 U6 - https://doi.org/10.1007/s10457-014-9709-2 SN - 1572-9680 VL - 88 IS - 3 SP - 505 EP - 515 ER - TY - GEN A1 - Matos, Eduardo da Silva A1 - Freese, Dirk A1 - Mendonça, Eduardo S. A1 - Slazak, Anna A1 - Hüttl, Reinhard F. T1 - Carbon, nitrogen and organic C fractions in topsoil affected by conversion from silviopastoral to different land use systems T2 - Agroforestry Systems Y1 - 2011 SN - 1572-9680 VL - 81 IS - 3 SP - 203 EP - 211 ER - TY - GEN A1 - Matos, Eduardo da Silva A1 - Freese, Dirk A1 - Slazak, Anna A1 - Bachmann, Ute A1 - Veste, Maik A1 - Hüttl, Reinhard F. T1 - Organic-carbon and nitrogen stocks and organic-carbon fractions in soils under mixed pine and oak forest stands of different ages in NE Germany T2 - Journal of plant nutrition and soil science Y1 - 2010 SN - 1522-2624 VL - 173 IS - 5 SP - 654 EP - 661 ER - TY - GEN A1 - Slazak, Anna A1 - Freese, Dirk A1 - Matos, Eduardo da Silva A1 - Hüttl, Reinhard F. T1 - Soil organic phosphorus fraction in pine-oak forest stands in Northeastern Germany T2 - Geoderma Y1 - 2010 SN - 0016-7061 VL - 158 IS - 3-4 SP - 156 EP - 162 ER - TY - GEN A1 - Slazak, Anna A1 - Freese, Dirk A1 - Matos, Eduardo da Silva A1 - Nii-Annang, Seth A1 - Hüttl, Reinhard F. T1 - Phosphorus pools in soil after land conversion from silvopasture to arable and grassland use T2 - Journal of Plant Nutrition and Soil Science N2 - 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. Y1 - 2014 U6 - https://doi.org/10.1002/jpln.201200334 SN - 1522-2624 VL - 177 IS - 2 SP - 159 EP - 167 ER - TY - CHAP A1 - Gypser, Stella A1 - Slazak, Anna A1 - Freese, Dirk ED - Novák, Martin ED - Krám, Pavel ED - Stepánová, M. T1 - Impact of crystallization of iron and aluminium hydroxides on the mechanisms of phosphate binding T2 - 9th International Symposium on Ecosystem Behavior BIOGEOMON, Litomysl, Czech Republic, August 20-24, 2017 Y1 - 2017 UR - http://www.biogeomon.cz/documents/Abstracts.pdf SP - 366 EP - 367 ER -