Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1111/ejss.13417
Lizenz creative commons licence
Titel (primär) Temperature and soil moisture change microbial allocation of pesticide-derived carbon
Autor Wirsching, J.; Chavez Rodriguez, L.; Ditterich, F.; Pagel, H.; He, R.; Uksa, M.; Zwiener, C.; Kandeler, E.; Poll, C.
Quelle European Journal of Soil Science
Erscheinungsjahr 2023
Department UMB
Band/Volume 74
Heft 5
Seite von e13417
Sprache englisch
Topic T7 Bioeconomy
Keywords anabolism; carbon use efficiency (CUE); catabolism; effect of soil moisture and temperature; gene-centric process model; MCPA biodegradation
Abstract Temperature and soil moisture are known to control pesticide mineralization. Half-life times (DT50) derived from pesticide mineralization curves generally indicate longer residence times at low soil temperature and moisture but do not consider potential changes in microbial allocation of pesticide-derived carbon (C). We aimed to determine carbon utilization efficiency (CUE, formation of new biomass relative to total C uptake) to better understand microbial utilization of pesticide-derived C under different environmental conditions and to support the conventional description of degradation dynamics based on mineralization. We performed a microcosm experiment at two MCPA (2-methyl-4-chlorophenoxyacetic acid) concentrations (1 and 20 mg kg-1) and defined 20°C/pF 1.8 as optimal and 10°C/pF 3.5 as limiting environmental conditions. After four weeks, 70% of the initially applied MCPA was mineralized under optimal conditions but MCPA mineralization reached less than 25% under limiting conditions. However, under limiting conditions, an increase in CUE was observed, indicating a shift toward anabolic utilization of MCPA derived C. In this case, increased C assimilation implied C storage or the formation of precursor compounds to support resistance mechanisms, rather than actual growth, since we did not find an increase in the tfdA gene relevant to MCPA degradation. We were able to confirm the assumption that under limiting conditions, C assimilation increases relative to mineralization and that C redistribution, may serve as an explanation for the difference between mineralization and MCPA dissipation derived degradation dynamics. In addition, by introducing CUE to the temperature- and moisture-dependent degradation of pesticides, we can capture the underlying microbial constraints and adaptive mechanisms to changing environmental conditions.
dauerhafte UFZ-Verlinkung
Wirsching, J., Chavez Rodriguez, L., Ditterich, F., Pagel, H., He, R., Uksa, M., Zwiener, C., Kandeler, E., Poll, C. (2023):
Temperature and soil moisture change microbial allocation of pesticide-derived carbon
Eur. J. Soil Sci. 74 (5), e13417 10.1111/ejss.13417