TY  - JOUR
A1  - Sorkau, Elisabeth
A1  - Boch, Steffen
A1  - Boeddinghaus, Runa S.
A1  - Bonkowski, Michael
A1  - Fischer, Markus
A1  - Kandeler, Ellen
A1  - Klaus, Valentin H.
A1  - Kleinebecker, Till
A1  - Marhan, Sven
A1  - Müller, Jörg
A1  - Prati, Daniel
A1  - Schoening, Ingo
A1  - Schrumpf, Marion
A1  - Weinert, Jan
A1  - Oelmann, Yvonne
T1  - The role of soil chemical properties, land use and plant diversity for microbial phosphorus in forest and grassland soils
JF  - Journal of plant nutrition and soil science = Zeitschrift für Pflanzenernährung und Bodenkunde
N2  - Management intensity modifies soil properties, e.g., organic carbon (C-org) concentrations and soil pH with potential feedbacks on plant diversity. These changes might influence microbial P concentrations (P-mic) in soil representing an important component of the Pcycle. Our objectives were to elucidate whether abiotic and biotic variables controlling P-mic concentrations in soil are the same for forests and grasslands, and to assess the effect of region and management on P-mic concentrations in forest and grassland soils as mediated by the controlling variables. In three regions of Germany, Schwabische Alb, Hanich-Dun, and Schorfheide-Chorin, we studied forest and grassland plots (each n=150) differing in plant diversity and land-use intensity. In contrast to controls of microbial biomass carbon (C-mic), P-mic was strongly influenced by soil pH, which in turn affected phosphorus (P) availability and thus microbial Puptake in forest and grassland soils. Furthermore, P-mic concentrations in forest and grassland soils increased with increasing plant diversity. Using structural equation models, we could show that soil C-org is the profound driver of plant diversity effects on P-mic in grasslands. For both forest and grassland, we found regional differences in P-mic attributable to differing environmental conditions (pH, soil moisture). Forest management and tree species showed no effect on P-mic due to a lack of effects on controlling variables (e.g., C-org). We also did not find management effects in grassland soils which might be caused by either compensation of differently directed effects across sites or by legacy effects of former fertilization constraining the relevance of actual practices. We conclude that variables controlling P-mic or C-mic in soil differ in part and that regional differences in controlling variables are more important for P-mic in soil than those induced by management.
KW  - age class forest
KW  - land-use intensity
KW  - meadow
KW  - microbes
KW  - pasture
KW  - unmanaged forest
Y1  - 2018
U6  - https://doi.org/10.1002/jpln.201700082
SN  - 1436-8730
SN  - 1522-2624
VL  - 181
IS  - 2
SP  - 185
EP  - 197
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Bernhard, Nadine
A1  - Moskwa, Lisa-Marie
A1  - Schmidt, Karsten
A1  - Oeser, Ralf Andreas
A1  - Aburto, Felipe
A1  - Bader, Maaike Y.
A1  - Baumann, Karen
A1  - von Blanckenburg, Friedhelm
A1  - Boy, Jens
A1  - van den Brink, Liesbeth
A1  - Brucker, Emanuel
A1  - Buedel, Burkhard
A1  - Canessa, Rafaella
A1  - Dippold, Michaela A.
A1  - Ehlers, Todd
A1  - Fuentes, Juan P.
A1  - Godoy, Roberto
A1  - Jung, Patrick
A1  - Karsten, Ulf
A1  - Koester, Moritz
A1  - Kuzyakov, Yakov
A1  - Leinweber, Peter
A1  - Neidhardt, Harald
A1  - Matus, Francisco
A1  - Mueller, Carsten W.
A1  - Oelmann, Yvonne
A1  - Oses, Romulo
A1  - Osses, Pablo
A1  - Paulino, Leandro
A1  - Samolov, Elena
A1  - Schaller, Mirjam
A1  - Schmid, Manuel
A1  - Spielvogel, Sandra
A1  - Spohn, Marie
A1  - Stock, Svenja
A1  - Stroncik, Nicole
A1  - Tielboerger, Katja
A1  - Uebernickel, Kirstin
A1  - Scholten, Thomas
A1  - Seguel, Oscar
A1  - Wagner, Dirk
A1  - Kühn, Peter
T1  - Pedogenic and microbial interrelations to regional climate and local topography
BT  - New insights from a climate gradient (arid to humid) along the Coastal Cordillera of Chile
JF  - Catena : an interdisciplinary journal of soil science, hydrology, geomorphology focusing on geoecology and landscape evolution
N2  - The effects of climate and topography on soil physico-chemical and microbial parameters were studied along an extensive latitudinal climate gradient in the Coastal Cordillera of Chile (26 degrees-38 degrees S). The study sites encompass arid (Pan de Azucar), semiarid (Santa Gracia), mediterranean (La Campana) and humid (Nahuelbuta) climates and vegetation, ranging from arid desert, dominated by biological soil crusts (biocrusts), semiarid shrubland and mediterranean sclerophyllous forest, where biocrusts are present but do have a seasonal pattern to temperate-mixed forest, where biocrusts only occur as an early pioneering development stage after disturbance. All soils originate from granitic parent materials and show very strong differences in pedogenesis intensity and soil depth. Most of the investigated physical, chemical and microbiological soil properties showed distinct trends along the climate gradient. Further, abrupt changes between the arid northernmost study site and the other semi-arid to humid sites can be shown, which indicate non-linearity and thresholds along the climate gradient. Clay and total organic carbon contents (TOC) as well as Ah horizons and solum depths increased from arid to humid climates, whereas bulk density (BD), pH values and base saturation (BS) decreased. These properties demonstrate the accumulation of organic matter, clay formation and element leaching as key-pedogenic processes with increasing humidity. However, the soils in the northern arid climate do not follow this overall latitudinal trend, because texture and BD are largely controlled by aeolian input of dust and sea salts spray followed by the formation of secondary evaporate minerals. Total soil DNA concentrations and TOC increased from arid to humid sites, while areal coverage by biocrusts exhibited an opposite trend. Relative bacterial and archaeal abundances were lower in the arid site, but for the other sites the local variability exceeds the variability along the climate gradient. Differences in soil properties between topographic positions were most pronounced at the study sites with the mediterranean and humid climate, whereas microbial abundances were independent on topography across all study sites. In general, the regional climate is the strongest controlling factor for pedogenesis and microbial parameters in soils developed from the same parent material. Topographic position along individual slopes of limited length augmented this effect only under humid conditions, where water erosion likely relocated particles and elements downward. The change from alkaline to neutral soil pH between the arid and the semi-arid site coincided with qualitative differences in soil formation as well as microbial habitats. This also reflects non-linear relationships of pedogenic and microbial processes in soils depending on climate with a sharp threshold between arid and semi-arid conditions. Therefore, the soils on the transition between arid and semi-arid conditions are especially sensitive and may be well used as indicators of long and medium-term climate changes. Concluding, the unique latitudinal precipitation gradient in the Coastal Cordillera of Chile is predestined to investigate the effects of the main soil forming factor - climate - on pedogenic processes.
KW  - Climate
KW  - Topography
KW  - Soil texture
KW  - Total organic carbon
KW  - Carbon isotope ratio (delta C-13(TOC))
KW  - Microbial abundance
Y1  - 2018
U6  - https://doi.org/10.1016/j.catena.2018.06.018
SN  - 0341-8162
SN  - 1872-6887
VL  - 170
SP  - 335
EP  - 355
PB  - Elsevier
CY  - Amsterdam
ER  -