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000916936 0247_ $$2doi$$a10.1016/j.soilbio.2022.108885
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000916936 1001_ $$0P:(DE-HGF)0$$aKeller, Nora$$b0$$eCorresponding author
000916936 245__ $$aCatchment scale spatial distribution of soil enzyme activities in a mountainous German coniferous forest
000916936 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2023
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000916936 520__ $$aTopography features within catchments influence soil properties, nutrient status, microbial dynamics and ultimately enzyme activities. Extracellular soil enzymes are essential for the decomposition of organic substrates and play a central role in global biogeochemical cycles. How topography and soil properties drive the spatial expression of enzyme activities at the catchment scale is still underexplored, especially in coniferous forest ecosystems. This study investigated the activity of four extracellular soil enzymes: β-glucosidase (β-glu), β-cellobiosidase (β-cello), acid phosphatase (pho) and leucine-aminopeptidase (l-leu) in Oh and Ah horizons of a (27 ha) mountainous coniferous forest catchment (Wüstebach, Eifel National Park, Germany). Spatial patterns and "hot spots" of activities of these four enzymes (involved in C-,N-, and P- cycling) were examined in connection to catchment units differing in slope, exposure and soil type (Cambisol vs. Gleysol), and multiple soil parameters (i.e., moisture content, pH, C, N, P, K, Fe, Mn content, C:N, C:P and N:P ratio). Catchment enzyme activities were overall, except for β-cello, significantly higher in the Oh than Ah horizon. Lower β-glu, and l-leu activities were found where more anaerobic soil conditions did occur, e.g., the river valleys (RV). Neither enhanced Oh horizon erosion on steeper Eastern (ES) and Northeastern (NES) slopes nor larger spatial soil nutrients heterogeneity on Northern (NS) and Western (WS) slopes, did significantly affect enzyme activity. Landscape topography did lead to a spatial variation of the activity of the four enzymes examined. The site-specific variation in C-cycling enzymes (β-glu and β-cello) was most marked at drier East, Northeast and Northern slopes, for P-cycling (pho) within the central wetter river valley but was for N-cycling (l-leu) enzyme activity more homogeneously distributed over the whole catchment. Overall, enzyme activities were strongly correlated to soil properties (especially soil moisture and organic carbon), but locations NS (Wüstebach source area) and RV (Wüstebach river flow path) showed less site-specific correlations. Further refinement of site-specific soil and external factors driving spatial distribution of enzyme activities at catchment scales and beyond will help to further tool up this research at larger spatial scales.
000916936 536__ $$0G:(DE-HGF)POF4-2173$$a2173 - Agro-biogeosystems: controls, feedbacks and impact (POF4-217)$$cPOF4-217$$fPOF IV$$x0
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000916936 7001_ $$0P:(DE-Juel1)145865$$aBol, Roland$$b1
000916936 7001_ $$0P:(DE-HGF)0$$aHerre, Michael$$b2
000916936 7001_ $$0P:(DE-HGF)0$$aMarschner, Bernd$$b3
000916936 7001_ $$0P:(DE-HGF)0$$aHeinze, Stefanie$$b4
000916936 773__ $$0PERI:(DE-600)1498740-5$$a10.1016/j.soilbio.2022.108885$$gVol. 177, p. 108885 -$$p108885 -$$tSoil biology & biochemistry$$v177$$x0038-0717$$y2023
000916936 8564_ $$uhttps://juser.fz-juelich.de/record/916936/files/Paperspatialenzymed_SBB19716R4-proof.pdf$$yPublished on 2022-11-18. Available in OpenAccess from 2024-11-18.
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