Microbial C, N and P in soils of Mediterranean oak forests: influence of season, canopy cover and soil depth

Aponte, Cristina; Marañón, Teodoro; García, Luis V.

doi:10.1007/s10533-010-9418-5

Cited by 147 publications

(119 citation statements)

References 65 publications

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“…In the case of N, the immobilization flux is 1.7 times larger than plant uptake. The more dominant role of microbes in P immobilization compared to N is supported by the finding of Aponte et al (2010) that 8.8 % of total P is immobilized by microbes compared to 4.7 % in the case of N. The mineralization of P from slowly decomposing soil organic matter can occur by biological and biochemical mineralization (McGill and Cole, 1981). Biochemical mineralization is mediated by extracellular enzymes which specifically cleave out P from organic matter; thus it is controlled by the P demand of biota (Stewart and Tiessen, 1987).…”

Section: Present Day: Comparison With Observationsmentioning

confidence: 91%

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

et al. 2012

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Abstract.Terrestrial carbon (C) cycle models applied for climate projections simulate a strong increase in net primary productivity (NPP) due to elevated atmospheric CO 2 concentration during the 21st century. These models usually neglect the limited availability of nitrogen (N) and phosphorus (P), nutrients that commonly limit plant growth and soil carbon turnover. To investigate how the projected C sequestration is altered when stoichiometric constraints on C cycling are considered, we incorporated a P cycle into the land surface model JSBACH (Jena Scheme for Biosphere-Atmosphere Coupling in Hamburg), which already includes representations of coupled C and N cycles.The model reveals a distinct geographic pattern of P and N limitation. Under the SRES (Special Report on Emissions Scenarios) A1B scenario, the accumulated land C uptake between 1860 and 2100 is 13 % (particularly at high latitudes) and 16 % (particularly at low latitudes) lower in simulations with N and P cycling, respectively, than in simulations without nutrient cycles. The combined effect of both nutrients reduces land C uptake by 25 % compared to simulations without N or P cycling. Nutrient limitation in general may be biased by the model simplicity, but the ranking of limitations is robust against the parameterization and the inflexibility of stoichiometry. After 2100, increased temperature and high CO 2 concentration cause a shift from N to P limitation at high latitudes, while nutrient limitation in the tropics declines. The increase in P limitation at high-latitudes is induced by a strong increase in NPP and the low P sorption capacity of soils, while a decline in tropical NPP due to high autotrophic respiration rates alleviates N and P limitations. The quantification of P limitation remains challenging. The poorly constrained processes of soil P sorption and biochemical mineralization are identified as the main uncertainties in the strength of P limitation. Even so, our findings indicate that global land C uptake in the 21st century is likely overestimated in models that neglect P and N limitations. In the long term, insufficient P availability might become an important constraint on C cycling at high latitudes. Accordingly, we argue that the P cycle must be included in global models used for C cycle projections.

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Section: Present Day: Comparison With Observationsmentioning

confidence: 91%

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

et al. 2012

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“…These include such elements as phosphorus (Berg and Joern, 2006;Bünemann et al, 2011;Fernandes et al, 2000;Mc Dowell and Sharpley, 2003), potassium (Brennan and Bell, 2013;Fotyma, 2007;Moody and Bell, 2006), magnesium (Tkaczyk et al, 2016;Tyler and Olsson, 2001) and sulphate-sulphur (Gąsior and Alvarez, 2012;Szulc et al, 2014), and microelements such as boron (Majidi et al, 2010;Shaaban, 2010;Szulc and Rutkowska, 2013), copper Su and Yang, 2008), iron (Mcgrath and Zhao, 2006), manganese (Antonkiewicz et al, 2016) and zinc (Barczak et al, 2009;Domańska, 2009;Rutkowska et al, 2014a). This knowledge should be complemented by the equally important data on other physicochemical properties of the fertilised soils, such as pH KCl or humus content (Aponte et al, 2010;Lipiński and Bednarek, 1998). Another agro-technical treatment which should be considered as greatly influencing crop yield and quality is acidic-soil liming (Tkaczyk and Bednarek, 2011).…”

Section: Introductionmentioning

confidence: 99%

Relationship between assimilable-nutrient content and physicochemical properties of topsoil

Tkaczyk¹,

Bednarek²,

Dresler³

et al. 2017

International Agrophysics

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In the years 2008-2011, an environmental study was conducted for Polish soils, focusing on the south-eastern Poland soils, as they exhibit significant acidification. This study aimed at assessing the current pHKCl and the supply of basic macro- (P, K, Mg and S-SO4) and microelements (B, Cu, Fe, Mn and Zn) in the collected soil samples, and also at determining their relationship with the soil agronomic category, humus content and pH class. Soil reaction and humus and macronutrient content were positively correlated with the amount of colloidal clay and particles < 0.02 mm. In the majority of cases, the macro-element content in the soil was positively correlated with soil pH and humus content. As for microelements, a usually significant and positive correlation was found between the soil agronomic category and the content of manganese, iron and zinc, whereas for the content of boron and copper, no such relationship was observed. A significant and positive correlation between soil reaction and the content of manganese, iron and boron was also found. Such correlations were not observed in relation to copper and zinc content. Statistical analysis indicated that the content of boron and manganese depended to the greatest extent on the investigated physicochemical properties.

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“…Variation in tree canopy cover can change soil microclimatic environment, soil physicochemical properties as well as soil carbon input and accumulation (Aponte et al 2010;Zhang et al 2011;Cahoon et al 2012). For example, variations in soil temperature and moisture within the forest ecosystem are very likely caused by canopy cover due to canopy shading and rainfall interception, especially for a small precipitation event (Cable and Huxman 2004;McCarthy and Brown 2006;Potts et al 2006b;Emmerich and Verdugo 2008).…”

Section: Introductionmentioning

confidence: 99%

Variation in soil respiration under the tree canopy in a temperate mixed forest, central China, under different soil water conditions

Liu¹,

Wang²,

Zhu³

et al. 2013

Ecological Research

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The forest canopy cover can directly and indirectly affect soil conditions and hence soil carbon emission through soil respiration. Little is known, however, on the effects of canopy cover on soil respiration under the canopy of different tree species and soil water conditions. We have examined the variation in soil respiration at different soil water conditions (dry <10 %, wet >20 %, v/v) under different tree canopy covers in comparison with the canopy interspace in a temperate coniferous (Pinus armandii Franch) and broadleaved (Quercus aliena var. acuteserrata) mixed forest in central China. The results show that soil respiration measured under tree canopy cover varied with canopy size and soil water content. Soil respiration under small‐sized canopies of P. armandii (PS) was higher than that under large‐sized (PL) canopies, but the difference was only significant under the dry soil condition. However, soil respiration under large‐sized canopies of Q. aliena (QL) was significantly greater than that under small‐sized (QS) canopies under both dry and wet soil conditions. The difference in soil respiration between differently sized canopies of Q. aliena (33.5–35.8 %) was significantly greater than that between differently sized canopies of P. armandii (2.4–8.1 %). Differences in soil respiration between inter‐plant gaps and under QS canopies in both the dry and wet soil conditions were significant. Significant increases in soil respiration (9.7–32.2 %) during the transition from dry to wet conditions were found regardless of canopy size, but the increase of soil respiration was significantly lower under P. armandii canopies (9.7–17.7 %) than under Q. aliena canopies (25.9–31.5 %). Our findings that the canopy cover of different tree species influences soil respiration under different soil moisture conditions could provide useful information for parameterizing and/or calibrating carbon flux models, especially for spatially explicit carbon models.

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Microbial C, N and P in soils of Mediterranean oak forests: influence of season, canopy cover and soil depth

Cited by 147 publications

References 65 publications

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

Nutrient limitation reduces land carbon uptake in simulations with a model of combined carbon, nitrogen and phosphorus cycling

Relationship between assimilable-nutrient content and physicochemical properties of topsoil

Variation in soil respiration under the tree canopy in a temperate mixed forest, central China, under different soil water conditions

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