55210
2017
2017
eng
1003
1019
17
4
14
article
Copernicus
Göttingen
1
2017-03-03
2017-03-03
--
Detecting small-scale spatial heterogeneity and temporal dynamics of soil organic carbon (SOC) stocks
Carbon (C) sequestration in soils plays a key role in the global C cycle. It is therefore crucial to adequately monitor dynamics in soil organic carbon (Delta SOC) stocks when aiming to reveal underlying processes and potential drivers. However, small-scale spatial (10-30 m) and temporal changes in SOC stocks, particularly pronounced in arable lands, are hard to assess. The main reasons for this are limitations of the well-established methods. On the one hand, repeated soil inventories, often used in long-term field trials, reveal spatial patterns and trends in Delta SOC but require a longer observation period and a sufficient number of repetitions. On the other hand, eddy covariance measurements of C fluxes towards a complete C budget of the soil-plant-atmosphere system may help to obtain temporal Delta SOC patterns but lack small-scale spatial resolution. To overcome these limitations, this study presents a reliable method to detect both short-term temporal dynamics as well as small-scale spatial differences of Delta SOC using measurements of the net ecosystem carbon balance (NECB) as a proxy. To estimate the NECB, a combination of automatic chamber (AC) measurements of CO2 exchange and empirically modeled aboveground biomass development (NPPshoot / were used. To verify our method, results were compared with Delta SOC observed by soil resampling. Soil resampling and AC measurements were performed from 2010 to 2014 at a colluvial depression located in the hummocky ground moraine landscape of northeastern Germany. The measurement site is characterized by a variable groundwater level (GWL) and pronounced small-scale spatial heterogeneity regarding SOC and nitrogen (Nt) stocks. Tendencies and magnitude of Delta SOC values derived by AC measurements and repeated soil inventories corresponded well. The period of maximum plant growth was identified as being most important for the development of spatial differences in annual Delta SOC. Hence, we were able to confirm that AC-based C budgets are able to reveal small-scale spatial differences and short-term temporal dynamics of Delta SOC.
Biogeosciences
a comparison between automatic chamber-derived C budgets and repeated soil inventories
10.5194/bg-14-1003-2017
1726-4170
1726-4189
wos:2017
WOS:000395322400002
Hoffmann, M (reprint author), Leibniz Ctr Agr Landscape Res ZALF, Inst Soil Landscape Res, Eberswalder Str 84, D-15374 Muncheberg, Germany., mathias.hoffmann@zalf.de
2022-06-17T07:28:14+00:00
sword
importub
filename=package.tar
63ba29c4323c8be38bcebdfe7b713015
false
true
Mathias Hoffmann
Nicole Jurisch
Juana Garcia Alba
Elisa Albiac Borraz
Marten Schmidt
Vytas Huth
Helmut Rogasik
Helene Rieckh
Gernot Verch
Michael Sommer
Jürgen Augustin
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
36890
2011
2011
eng
289
300
12
1-2
342
article
Springer
Dordrecht
1
--
--
--
Within-field variation of mycotoxin contamination of winter wheat is related to indicators of soil moisture
Humidity is an important determinant of the mycotoxin production (DON, ZEA) by Fusarium species in the grain ears. From a landscape perspective humidity is not evenly distributed across fields. The topographically-controlled redistribution of water within a single field rather leads to spatially heterogeneous soil water content and air humidity. Therefore we hypothesized that the spatial distribution of mycotoxins is related to these topographically-controlled factors. To test this hypothesis we studied the mycotoxin concentrations at contrasting topographic relief positions, i.e. hilltops and depressions characterized by soils of different soil moisture regimes, on ten winter wheat fields in 2006 and 2007. Maize was the preceding crop and minimum tillage was practiced in the fields. The different topographic positions were associated with moderate differences in DON and ZEA concentrations in 2006, but with significant differences in 2007, with six times higher median ZEA and two times higher median DON detected at depression sites compared to the hilltops. The depression sites correspond to a higher topographic wetness index as well as redoximorphic properties in soil profiles, which empirically supports our hypothesis at least for years showing wetter conditions in sensitive time windows for Fusarium infections.
Plant and soil
10.1007/s11104-010-0695-5
0032-079X
1573-5036
wos:2011-2013
WOS:000289562000023
Muller, MEH (reprint author), Leibniz Ctr Agr Landscape Res, Inst Landscape Matter Dynam, Eberswalder Str 84, D-15374 Muncheberg, Germany., mmueller@zalf.de
Marina Elsa Herta Mueller
Sylvia Koszinski
Alexander Brenning
Gernot Verch
Ulrike Korn
Michael Sommer
eng
uncontrolled
Wheat
eng
uncontrolled
Mycotoxins
eng
uncontrolled
Within-field variation
eng
uncontrolled
Topography
eng
uncontrolled
Humidity
eng
uncontrolled
Soil redoximorphic feature
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
41711
2017
2019
eng
17
666
postprint
1
2019-03-04
2019-03-04
--
Detecting small-scale spatial heterogeneity and temporal dynamics of soil organic carbon (SOC) stocks
Carbon (C) sequestration in soils plays a key role in the global C cycle. It is therefore crucial to adequately monitor dynamics in soil organic carbon (Delta SOC) stocks when aiming to reveal underlying processes and potential drivers. However, small-scale spatial (10-30 m) and temporal changes in SOC stocks, particularly pronounced in arable lands, are hard to assess. The main reasons for this are limitations of the well-established methods. On the one hand, repeated soil inventories, often used in long-term field trials, reveal spatial patterns and trends in Delta SOC but require a longer observation period and a sufficient number of repetitions. On the other hand, eddy covariance measurements of C fluxes towards a complete C budget of the soil-plant-atmosphere system may help to obtain temporal Delta SOC patterns but lack small-scale spatial resolution.
To overcome these limitations, this study presents a reliable method to detect both short-term temporal dynamics as well as small-scale spatial differences of Delta SOC using measurements of the net ecosystem carbon balance (NECB) as a proxy. To estimate the NECB, a combination of automatic chamber (AC) measurements of CO2 exchange and empirically modeled aboveground biomass development (NPPshoot / were used. To verify our method, results were compared with Delta SOC observed by soil resampling.
Soil resampling and AC measurements were performed from 2010 to 2014 at a colluvial depression located in the hummocky ground moraine landscape of northeastern Germany. The measurement site is characterized by a variable groundwater level (GWL) and pronounced small-scale spatial heterogeneity regarding SOC and nitrogen (Nt) stocks. Tendencies and magnitude of Delta SOC values derived by AC measurements and repeated soil inventories corresponded well. The period of maximum plant growth was identified as being most important for the development of spatial differences in annual Delta SOC. Hence, we were able to confirm that AC-based C budgets are able to reveal small-scale spatial differences and short-term temporal dynamics of Delta SOC.
Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
a comparison between automatic chamber-derived C budgets and repeated soil inventories
10.25932/publishup-41711
urn:nbn:de:kobv:517-opus4-417118
1866-8372
online registration
Biogeosciences 14 (2017), pp. 1003–1019 DOI 10.5194/bg-14-1003-2017
false
true
CC-BY - Namensnennung 4.0 International
Mathias Hoffmann
Nicole Jurisch
Juana Garcia Alba
Elisa Albiac Borraz
Marten Schmidt
Vytas Huth
Helmut Rogasik
Helene Rieckh
Gernot Verch
Michael Sommer
Jürgen Augustin
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
666
eng
uncontrolled
net ecosystem exchange
eng
uncontrolled
North Central region
eng
uncontrolled
no-till ecosystem
eng
uncontrolled
eddy covariance
eng
uncontrolled
CO2 fluxes
eng
uncontrolled
dioxide exchange
eng
uncontrolled
United States
eng
uncontrolled
gas-exchange
eng
uncontrolled
agricultural landscapes
eng
uncontrolled
monitoring networks
Geowissenschaften
Biowissenschaften; Biologie
open_access
Mathematisch-Naturwissenschaftliche Fakultät
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/41711/pmnr666.pdf
61046
2021
2021
eng
9
296
article
Elsevier
Amsterdam
1
2020-10-08
2021-01-15
--
A novel robotic chamber system allowing to accurately and precisely determining spatio-temporal CO2 flux dynamics of heterogeneous croplands
The precise and accurate assessment of carbon dioxide (CO2) exchange is crucial to identify terrestrial carbon (C) sources and sinks and for evaluating their role within the global C budget. The substantial uncertainty in disentangling the management and soil impact on measured CO2 fluxes are largely ignored especially in cropland. The reasons for this lies in the limitation of the widely used eddy covariance as well as manual and automatic chamber systems, which either account for short-term temporal variability or small-scale spatial heterogeneity, but barely both. To address this issue, we developed a novel robotic chamber system allowing for dozens of spatial measurement repetitions, thus enabling CO2 exchange measurements in a sufficient temporal and high small-scale spatial resolution. The system was tested from 08th July to 09th September 2019 at a heterogeneous field (100 m x 16 m), located within the hummocky ground moraine landscape of northeastern Germany (CarboZALF-D). The field is foreseen for a longer-term block trial manipulation experiment extending over three erosion induced soil types and was covered with spring barley. Measured fluxes of nighttime ecosystem respiration (R-eco) and daytime net ecosystem exchange (NEE) showed distinct temporal patterns influenced by crop phenology, weather conditions and management practices. Similarly, we found clear small-scale spatial differences in cumulated (gap-filled) R-eco, gross primary productivity (GPP) and NEE fluxes affected by the three distinct soil types. Additionally, spatial patterns induced by former management practices and characterized by differences in soil pH and nutrition status (P and K) were also revealed between plots within each of the three soil types, which allowed compensating for prior to the foreseen block trial manipulation experiment. The results underline the great potential of the novel robotic chamber system, which not only detects short-term temporal CO2 flux dynamics but also reflects the impact of small-scale spatial heterogeneity.
Agricultural and forest meteorology
10.1016/j.agrformet.2020.108206
0168-1923
1873-2240
outputup:dataSource:ScienceDirect:2021
108206
WOS:000595613000002
Vaidya, S (corresponding author), Leibniz Ctr Agr Landscape Res ZALF, Working Grp Isotope Biogeochem & Gas Fluxes, Eberswalder Str 84, D-15374 Muncheberg, Germany., shrijana.vaidya@zalf.de
German Federal Ministry of Food and Agriculture (FNR) [22404117]
Vaidya, Shrijana
2023-10-12T08:11:31+00:00
sword
importub
filename=package.tar
4897161c18e3a17e1067f3bba6a713fd
2012165-9
409905-9
false
true
Shrijana Vaidya
Marten Schmidt
Peter Rakowski
Norbert Bonk
Gernot Verch
Jürgen Augustin
Michael Sommer
Mathias Hoffmann
eng
uncontrolled
Automatic chamber
eng
uncontrolled
Net ecosystem exchange (NEE)
eng
uncontrolled
Gross primary
eng
uncontrolled
productivity (GPP)
eng
uncontrolled
Ecosystem respiration (R-eco)
eng
uncontrolled
Soil erosion
eng
uncontrolled
Soil
eng
uncontrolled
heterogeneity
Geowissenschaften
Landwirtschaft und verwandte Bereiche
Hauswirtschaft und Familie
Referiert
Institut für Umweltwissenschaften und Geographie
Import