Carbon and nitrogen inputs differentially affect priming of soil organic matter in tropical lowland and montane soils

Hicks, Lettice C.; Meir, Patrick; Nottingham, Andrew T.; Reay, Dave; Stott, Andrew; Salinas, Norma; Whitaker, Jeanette

doi:10.1016/j.soilbio.2018.10.015

Cited by 87 publications

(39 citation statements)

References 85 publications

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“…Furthermore, after adding N, little or no change in microbial composition was noticed within 210 days. This result is consistent with the findings of Hicks et al [51], where they stated that nutrient treatments are extremely small—relative to the inherent nutrient status of the soil—to change the microbial composition.…”

Section: Discussionsupporting

confidence: 92%

“…Moreover, the addition of LL and FL significantly increased the relative abundance of fungi, whereas the addition of TR and T significantly decreased the relative abundance of bacteria. This discrepancy indicates that the response of bacteria and fungi to an external C source was determined by the complexity of the C substrates [51]. Wang et al [38] suggested that the differences in the substrate’s chemical quality can change the relative abundance of bacteria and fungi in soils, which can explain the different responses of the microbial community to the addition of different organs.…”

Section: Discussionmentioning

confidence: 99%

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Effects of inorganic nitrogen and litters of Masson Pine on soil organic carbon decomposition

Chao

Zhang

et al. 2019

PLoS ONE

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Soil organic matter (SOM) mineralization represents one of the largest fluxes in the global carbon cycle. Numerous studies have shown that soil organic carbon decomposition was largely changed owing to the addition of litter, however very few studies have focused on the role of plant organs in the priming effects (PEs). Here, we studied the effects of different Pinus massoniana organs (fresh leaf, leaf litter, twigs, absorptive fine roots, and transport fine roots) on C4 soil respiration by applying the 13C isotopic natural abundance method. Results showed that the effects of plant organs on PEs were significantly different at the end of 210 days incubation, which can be ascribed to contrasting organs traits especially non-structural carbohydrates and water-soluble compounds. Transport fine roots and fresh leaf induced positive PE, whereas absorptive fine roots induced negative PE. Leaf litter did not change the native SOC decomposition. Plant organ addition can change the microbial community and result in the reduction of bacteria-to-fungi ratio. Our results suggest that with regard to determining the PE of the entire ecosystem, using fresh leaf to represent leaf litter and aboveground to represent underground is implausible.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Effects of inorganic nitrogen and litters of Masson Pine on soil organic carbon decomposition

Chao

Zhang

et al. 2019

PLoS ONE

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“…There has been increasing interest in understanding how litter quality and environmental variables influence the priming of SOM decomposition. Most studies to date have relied on laboratory incubation experiments to address questions of priming (Anderson & Hetherington, ; Creamer et al, ; Hicks et al, ), with few in situ studies examining PE under field conditions (Kumar, Kuzyakov, & Pausch, ). Results from our field study across two contrasting subtropical sites provide strong evidence that the magnitude of PE is influenced by the interaction of litter quality, site characteristics and home‐field advantage.…”

Section: Discussionmentioning

confidence: 99%

Litter quality and site characteristics interact to affect the response of priming effect to temperature in subtropical forests

et al. 2019

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Forest litter inputs to soil can stimulate the decomposition of older soil organic matter (SOM) via a priming effect (PE). The magnitude and underlying mechanisms driving PE are poorly understood, with especially little know about how litter quality and site conditions affect PE in situ. Further, very few studies have examined PE in tropical and subtropical soils. Here, we established low and high elevation sites (600 vs. 1,400 m a.s.l.) in the subtropical Wuyishan National Park, China, that differed with respect to mean annual temperature (MAT; ∆MAT = 4.2°C), vegetation, soil texture and soil moisture. We conducted a 1‐year field incubation study at these two sites to compare PE induced by adding low‐ and high‐quality 13C‐labelled leaf litter to soils. At the low elevation site, additions of high‐quality (low C/N) litter caused a PE that was 140% greater than the PE observed following additions of low‐quality (high C/N) litter. In contrast, we saw no significant differences in PE between litter types at the high elevation site, perhaps because PE was not limited by substrate quality at this cooler, finer textured and higher soil moisture coniferous site. In addition, we found a negative relationship between home‐field advantage (HFA) for litter decomposition and PE, indicating that specialized litter decomposer community driving HFA may not accelerate SOM decomposition via PE in the same way. In line with our observed strong relationship between PE and the efficiency of priming (PE size per unit of mineralized litter C), PEs induced by the high‐ and low‐quality litters were directed to microbial phosphorus (P) mining rather than nitrogen (N) mining. This interpretation aligns with observed increases in the activity of P acquiring extracellular enzymes, often described as phosphatases (P‐tases), as well as the positive relationship between the PE, P‐tase activity and the activity of C acquiring extracellular enzymes. Overall, this PE study across two contrasting sites highlights the important role of site characteristics and litter quality in regulating PE size. Further, we suggest that MAT may be a dominant driver of soil priming, through both the direct effects of litter quantity on labile substrate supply and the indirect effects of litter quality changes on downstream decomposer communities. A free Plain Language Summary can be found within the Supporting Information of this article.

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“…A composição mineral argilosa, a capacidade de troca catiônica e o tamanho das partículas contribuem para as características de sedimentação dos solos. 42,43 Após a retirada das impurezas do solo, foram verificadas as suas fases.…”

Section: Resultados E Discussõesunclassified

Sequência Didática Para a Promoção De Estudo Prático E Multidisciplinar Com Materiais Acessíveis

et al. 2020

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DIDACTIC SEQUENCE FOR THE PROMOTION OF PRACTICAL AND MULTIDISCIPLINARY STUDY WITH ACCESSIBLE MATERIALS. Innovation and multidisciplinarity are the way to accelerate improvements in education, as well as the search for contextualized content. The multidisciplinarity between chemistry and Biology, allows to explore various contents, one of them is the environment. Works that offer alternatives to simpler experiments are of great help professors. In this context, this study suggests a didactic sequence using easily accessible materials to address chemical and Microbiological concepts of soil. The proposal is aimed at high school students and early undergraduate students. The contents were: hydrogen potentials (pH), mixture separation methods, soil liquid and gas phases and soil microbial population extraction involving bacterial DNA. Thus, the work shows a low cost alternative for the teaching of concepts related to soil, being a contextualized, multidisciplinary, dynamic and attractive proposal.

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Carbon and nitrogen inputs differentially affect priming of soil organic matter in tropical lowland and montane soils

Cited by 87 publications

References 85 publications

Effects of inorganic nitrogen and litters of Masson Pine on soil organic carbon decomposition

Effects of inorganic nitrogen and litters of Masson Pine on soil organic carbon decomposition

Litter quality and site characteristics interact to affect the response of priming effect to temperature in subtropical forests

Sequência Didática Para a Promoção De Estudo Prático E Multidisciplinar Com Materiais Acessíveis

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