TY  - JOUR
A1  - Gerke, Horst H.
A1  - Rieckh, Helene
A1  - Sommer, Michael
T1  - Interactions between crop, water, and dissolved organic and inorganic carbon in a hummocky landscape with erosion-affected pedogenesis
JF  - Macromolecular rapid communications
N2  - Hummocky soil landscapes are characterized by 3D spatial patterns of soil types that result from erosion-affected pedogenesis. Due to tillage and water erosion, truncated profiles have been formed at steep and mid slopes and colluvial soils at hollows, while intact profiles remained at plateau positions. Pedogenetic variations in soil horizons lead to spatial differences in the soil water balance at hillslope positions. Here, possible interactions between erosion affected soil properties, the water balances, and the crop growth and feedback effects of erosion on the leaching rates were assumed. The hypothesis was tested by water balance simulations comparing uniform with hillslope position-specific crop and root growths for soils at plateau, flat mid slope, steep slope, and hollow using the Hydrus-1D program. The boundary condition data were monitored at the CarboZALF-D experimental field site, which was cropped with perennial lucerne (Medicago sativa L.) in 2013 and 2014. Crop and root growth at the four hillslope positions was assumed proportional to observed leaf area index (LAI). Fluxes of dissolved organic and inorganic carbon (DOC, DIC) were obtained from simulated water fluxes and measured DOC and DIC concentrations. For the colluvic soil at hollow, the crop growth was initially highest and later limited by an increasing water table; here the predominately upward flow led to a net input in DIC and DOC. For the truncated soils at steep slopes, simulations support the hypothesis that reduced crop growth caused an increase in percolation and DIC leaching from the subsoil horizons, which in turn led to accelerated soil development and more soil variations along eroding hillslopes in arable soil landscapes. (C) 2015 Elsevier B.V. All rights reserved.
KW  - Hydrus-1D
KW  - LAI
KW  - Eroded soil types
KW  - Hillslope pedosequence
KW  - Soil C leaching
KW  - DOC vs. DIC
KW  - Soil water balance simulation
KW  - Root water uptake
KW  - Rooting depth
Y1  - 2016
U6  - https://doi.org/10.1016/j.still.2015.09.003
SN  - 0167-1987
SN  - 1879-3444
VL  - 156
SP  - 230
EP  - 244
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Premke, Katrin
A1  - Attermeyer, Katrin
A1  - Augustin, Jürgen
A1  - Cabezas, Alvaro
A1  - Casper, Peter
A1  - Deumlich, Detlef
A1  - Gelbrecht, Jörg
A1  - Gerke, Horst H.
A1  - Gessler, Arthur
A1  - Großart, Hans-Peter
A1  - Hilt, Sabine
A1  - Hupfer, Michael
A1  - Kalettka, Thomas
A1  - Kayler, Zachary
A1  - Lischeid, Gunnar
A1  - Sommer, Michael
A1  - Zak, Dominik
T1  - The importance of landscape diversity for carbon fluxes at the landscape level: small-scale heterogeneity matters
JF  - Wiley Interdisciplinary Reviews : Water
N2  - Landscapes can be viewed as spatially heterogeneous areas encompassing terrestrial and aquatic domains. To date, most landscape carbon (C) fluxes have been estimated by accounting for terrestrial ecosystems, while aquatic ecosystems have been largely neglected. However, a robust assessment of C fluxes on the landscape scale requires the estimation of fluxes within and between both landscape components. Here, we compiled data from the literature on C fluxes across the air–water interface from various landscape components. We simulated C emissions and uptake for five different scenarios which represent a gradient of increasing spatial heterogeneity within a temperate young moraine landscape: (I) a homogeneous landscape with only cropland and large lakes; (II) separation of the terrestrial domain into cropland and forest; (III) further separation into cropland, forest, and grassland; (IV) additional division of the aquatic area into large lakes and peatlands; and (V) further separation of the aquatic area into large lakes, peatlands, running waters, and small water bodies These simulations suggest that C fluxes at the landscape scale might depend on spatial heterogeneity and landscape diversity, among other factors. When we consider spatial heterogeneity and diversity alone, small inland waters appear to play a pivotal and previously underestimated role in landscape greenhouse gas emissions that may be regarded as C hot spots. Approaches focusing on the landscape scale will also enable improved projections of ecosystems’ responses to perturbations, e.g., due to global change and anthropogenic activities, and evaluations of the specific role individual landscape components play in regional C fluxes. WIREs Water 2016, 3:601–617. doi: 10.1002/wat2.1147
Y1  - 2016
U6  - https://doi.org/10.1002/wat2.1147
SN  - 2049-1948
SN  - 2049-1948
VL  - 3
SP  - 601
EP  - 617
PB  - Wiley
CY  - Hoboken
ER  -