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000138296 0247_ $$2doi$$a10.1016/j.geoderma.2013.08.009
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000138296 0247_ $$2ISSN$$a0016-7061
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000138296 037__ $$aFZJ-2013-04452
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000138296 1001_ $$0P:(DE-HGF)0$$aFóti, Szilvia$$b0$$eCorresponding author
000138296 245__ $$aSoil moisture induced changes on fine-scale spatial pattern of soil respiration in a semi-arid sandy grassland
000138296 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2014
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000138296 520__ $$aHigh variability of soil respiration measured at fine spatial scale increases the uncertainty when trying to deter- mine the representative average soil respiration (Rs) flux. A possible way to decrease the uncertainty, while also optimising measurement effort, could be the calculation of required number of Rs measurements (Nopt) together with the optimisation of their spatial arrangement. The goals of this study were to find explanatory variables of the structural parameters of fine-scale Rs spatial pattern and of Nopt for sampling optimisation. We conducted field Rs, soil temperature (Ts) and soil water content (SWC) measurements in a Hungarian sandy pasture over several years along circular transects of 75 evenly spaced (20 cm distance) sampling positions. Structural param- eters of patterns of Rs and the covariates were determined from variograms. Ranges of spatial autocorrelation varied between 0 and 3.6 m for Rs, 0 and 3 m for SWC and 0 and 2.9 m for Ts. Patch size of Rs depended negatively on transect average SWC. To understand and quantify the spatial dependence of variables, cross-variograms were calculated. Rs proved to be positively spatially correlated to SWC at low water supply, while Ts-Rs and SWC-Ts spatial correlations were mostly negative, both due the direct effect of evaporative cooling on Ts. We found that spatial patchiness became less robust and the correlations generally decreased as soil moisture content was high. We found that explanatory variable of Nopt was also SWC, with negative correlation between them. We conclude that sampling could be optimized on the basis of the easily measurable actual SWC, which deter- mines both the optimal number of Rs measurements and the minimum distances between individual samples in semi-arid ecosystems.
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000138296 7001_ $$0P:(DE-HGF)0$$aBalogh, János$$b1
000138296 7001_ $$0P:(DE-HGF)0$$aNagy, Zoltán$$b2
000138296 7001_ $$0P:(DE-Juel1)129469$$aHerbst, Michael$$b3$$ufzj
000138296 7001_ $$0P:(DE-HGF)0$$aPintér, Krisztina$$b4
000138296 7001_ $$0P:(DE-HGF)0$$aPéli, Evelin$$b5
000138296 7001_ $$0P:(DE-HGF)0$$aKoncz, Péter$$b6
000138296 7001_ $$0P:(DE-HGF)0$$aBartha, Sándor$$b7
000138296 773__ $$0PERI:(DE-600)2001729-7$$a10.1016/j.geoderma.2013.08.009$$gVol. 213, p. 245 - 254$$p245 - 254$$tGeoderma$$v213$$x0016-7061$$y2014
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