Temperature and soil moisture dependence of N mineralization in intact soil cores

Sierra, Jorge

doi:10.1016/s0038-0717(96)00288-x

Cited by 193 publications

(132 citation statements)

References 16 publications

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“…Our observations in this study indicated that soil net N nitrification and net N mineralisation (incubation temperature !08C) increased exponentially with the increase in incubation temperatures, with temperature sensitivity (Q 10 ) of net N mineralisation being 2.20 and 2.49 in the plantation and natural forests. The temperature sensitivity of net N mineralisation observed in our study was comparable to results for coniferous forests of Western Europe (Dalias et al 2002), but greater than the responses from typical Argiudoll, Austrian alpine soil and temperate grassland of Northern China (Sierra 1997;Wang et al 2006;Koch et al 2007).…”

Section: Discussionsupporting

confidence: 83%

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Liu

Yin

2014

Soil Res.

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Abstract. Intact soil cores from two adjacent forest ecosystems (natural coniferous forest and dragon spruce plantation) were incubated in the laboratory to examine effects of temperature, reforestation and their interactions on rates of nitrogen (N) mineralisation, nitrification and ammonification in the subalpine forest of the eastern Tibetan Plateau. Two contrasting soils were incubated at five temperatures (-5, 0, 5, 15 and 258C) for 4 weeks. Rates of N mineralisation and nitrification were insensitive to temperature at lower temperatures (08C and 58C) but increased over higher temperatures (158C and 258C). Large amounts of ammonium were released for each incubation time in both soils when the incubation temperature was À58C. Therefore, the rates of mineralisation and ammonification at À58C were significantly higher than at the other temperatures. Both the accumulations of inorganic N and rates of N transformation were significantly higher in the natural forest than in the plantation. Moreover, temperature sensitivity of net nitrification and N mineralisation were greater in the natural forest than the spruce plantation. Effects of temperature on accumulations of inorganic N and rates of N transformation were dependent on incubation time and forest ecosystem. Our results suggested that À58C might be a key low temperature for N mineralisation in subalpine forest on the eastern Tibetan Plateau; the effect of projected warming on soil N transformation rate may be less significant in plantation forests than natural forests in this specific region.

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Section: Discussionsupporting

confidence: 83%

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Liu

Yin

2014

Soil Res.

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“…Most likely, higher temperatures early in the growing season do not have a large net negative effect on ANPP G early in the growing season because the reduction in growth associated with a decline in soil moisture at that time is offset in part by the positive effects of high temperatures. For example, high temperatures early in the growing season might promote growth directly by raising leaf temperatures closer to the optimum temperature for C 4 photosynthesis (27,28) or indirectly by increasing N mineralization (46).…”

Section: Resultsmentioning

confidence: 99%

Timing of climate variability and grassland productivity

Craine

Nippert

Elmore

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

287

185

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Future climates are forecast to include greater precipitation variability and more frequent heat waves, but the degree to which the timing of climate variability impacts ecosystems is uncertain. In a temperate, humid grassland, we examined the seasonal impacts of climate variability on 27 y of grass productivity. Drought and highintensity precipitation reduced grass productivity only during a 110-d period, whereas high temperatures reduced productivity only during 25 d in July. The effects of drought and heat waves declined over the season and had no detectable impact on grass productivity in August. If these patterns are general across ecosystems, predictions of ecosystem response to climate change will have to account not only for the magnitude of climate variability but also for its timing.Konza | net primary production | streamflow | critical climate periods F uture climates are likely to include more frequent droughts, high-intensity precipitation patterns, and heat waves, (i.e., periods of elevated air temperatures) (1, 2). At their most severe, extreme climate events, such as the mid-American heat waves of 1980 and 2011 and the 2003 European heat wave, involve months of hot, dry weather (3, 4), increasing mortality in humans and wildlife (5, 6) while reducing agricultural and natural-systems productivity (7-10). An increase in climate extremes would have unambiguously negative effects on ecosystems. However, most climate variability would not be considered extreme and occurs on much shorter time scales throughout the growing season with temperature and precipitation frequently disassociated. The response of ecosystems to short-term climate variability at different times of year is thought to vary (11-16), but we know little about how the timing of short-duration climate variability impacts key ecosystem dynamics such as plant productivity.To understand better how the timing of climate variability affects grassland productivity, we applied the critical climate period approach (17, 18) to long-term measurements of grass productivity in a humid, temperate grassland. Aboveground net primary productivity of grass (ANPP G ) was measured at the time of peak standing biomass from 1984-2010 in both shallow-soil upland and deep-soil lowland topographic positions in an annually burned, ungrazed watershed that is dominated by grasses with the C 4 photosynthetic pathway. In attempting to understand how the timing of climate variability affects grass productivity, we analyzed long-term records of precipitation, stream discharge, and air temperature to examine how variation in drought, precipitation intensity, and heat waves affect grass productivity at different times of the growing season. Results and DiscussionAcross 27 y, drought reduced grass productivity over a wide range of dates but had declining effects as the season progressed. ANPP G decreased with decreasing precipitation summed from April 15 to August 2 [day of year (DOY) 105-214] (Fig. 1). ANPP G declined 0.60 ± 0.12 g·m −2 for each millimeter decline in p...

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“…This higher soil moisture may have led to overestimating production and uptake rates [29]. However, Sierra [73] did not find a high response of mineralisation to an increase in soil moisture inside incubated cylinders of soil, and nor did Jussy [40] find such a response in laboratory incubations of this specific soil. Other explanations may be linked to the extra mineralisation of severed roots within the cylinders [33] which would also lead to overestimating T 1 .…”

Section: Limits Of the In Situ Incubation Methodsmentioning

confidence: 98%

“…Numerous studies discuss the possible bias of the in situ incubation method (see for instance Raison et al [65], Adams et al [2], Sierra [73], Jussy et al [41]). The method is based on the assumptions that physical and chemical conditions are similar inside and outside the cylinders and that the production rate of mineral N is not modified inside the cylinders.…”

Section: Limits Of the In Situ Incubation Methodsmentioning

confidence: 99%

Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation

et al. 2004

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-In situ net nitrogen mineralisation, deposition, uptake and leaching fluxes were determined in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation in the Beaujolais mountains. Measurements were performed during five years before the clear-cut of the stand and two years after the clear-cut. Deposition and mineralisation of N decreased after the harvest. The drastic decrease in tree N uptake was counteracted by the developing understorey vegetation. Microbial immobilisation, favoured by the input of organic matter and the increase in temperature, was probably the cause of a decrease in the net mineralisation of N. Leaching of mineral N at 15 cm depth decreased after the harvest. However, fluxes of Mg and Ca leached at 60 cm depth did not vary after the harvest.nitrogen cycle / clear-cut / Pseudotsuga menziesii / leaching / soil Résumé -Effet de la coupe à blanc d'une plantation de Douglas (Pseudotsuga menziesii (Mirb.) Franco) de 67 ans, sur la production in situ d'azote minéral et sur le cycle de l'azote. La minéralisation nette, les dépôts, l'absorption et le drainage d'azote ont été mesurés in situ dans une plantation de Douglas (Pseudotsuga menziesii (Mirb.) Franco) de 67 ans, située sur sol acide dans les monts du Beaujolais. Les mesures ont été effectuées pendant cinq ans avant la coupe à blanc du peuplement, puis pendant 2 ans après la coupe. Les dépôts d'azote atmosphérique et la minéralisation de l'azote diminuent après la récolte. La diminution du prélèvement d'azote par les racines est limitée par le développement de la végétation herbacée. L'immobilisation microbienne de l'azote, favorisée par les apports de matière organique et l'augmentation de la température, est supposée être la cause de cette diminution de la minéralisation nette. En conséquence, le drainage d'azote minéral à 15 cm de profondeur est réduit après la coupe. Toutefois, les flux de Mg et Ca dans les solutions gravitaires à 60 cm de profondeur ne sont pas modifiés après la coupe. cycle de l'azote / coupe à blanc / Pseudotsuga menziesii / drainage / sol

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Temperature and soil moisture dependence of N mineralization in intact soil cores

Cited by 193 publications

References 16 publications

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Effects of temperature on soil net nitrogen mineralisation in two contrasting forests on the eastern Tibetan Plateau, China

Timing of climate variability and grassland productivity

Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation

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