Carbon fluxes in soil food webs of increasing complexity revealed by 14C labelling and 13C natural abundance

Ruf, Andrea; Kuzyakov, Yakov; Lopatovskaya, O. G.

doi:10.1016/j.soilbio.2006.03.008

Cited by 88 publications

(62 citation statements)

References 46 publications

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“…This agrees with our hypothesis that P. armata would derive more of it resources from roots than the two other species because it can feed directly on roots. Our finding that the rhizosphere channel was the main supplier of energy in the soil food web is in line with previous findings (Garrett et al 2001;Pelz et al 2005;Ruf et al 2006). However, the large loss of LGM-C at the beginning of the experiment indicates that LGM-C was very important for fuelling the microbial mediated release of mineral N and subsequent plant growth.…”

Section: Discussionsupporting

confidence: 93%

Assimilation dynamics of soil carbon and nitrogen by wheat roots and Collembola

Larsen

Gorissen²,

Krogh

et al. 2007

Plant Soil

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It has been demonstrated that plant roots can take up small amounts of low-molecular weight (LMW) compounds from the surrounding soil. Root uptake of LMW compounds have been investigated by applying isotopically labelled sugars or amino acids but not labelled organic matter. We tested whether wheat roots took up LMW compounds released from dual-labelled ( 13 C and 15 N) green manure by analysing for excess 13 C in roots. To estimate the fraction of green manure C that potentially was available for root uptake, excess 13 C and 15 N in the primary decomposers was estimated by analysing soil dwelling Collembola that primarily feed on fungi or microfauna. The experimental setup consisted of soil microcosm with wheat and duallabelled green manure additions. Plant growth, plant N and recoveries of 13 C and 15 N in soil, roots, shoots and Collembola were measured at 27, 56 and 84 days. We found a small (<1%) but significant uptake of green manure derived 13 C in roots at the first but not the two last samplings. About 50% of green manure C was not recovered from the soil-plant system at 27 days and additional 8% was not recovered at 84 days. Up to 23% of C in collembolans derived from the green manure at 56 days (the 27 days sampling was lost). Using a linear mixing model we estimated that roots or root effluxes provided the main C source for collembolans (54À79%). We conclude that there is no solid support for claiming that roots assimilated green manure derived C due to very small or no recoveries of excess 13 C in wheat roots. During the incubation the pool of green manure derived C available for root uptake decreased due to decomposition. However, the isotopic composition in Collembola indicated that there was a considerable fraction of green manure derived C in the decomposer system at 56 days thus supporting the premise that LMW compounds containing C from the green manure was released throughout the incubation.

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Section: Discussionsupporting

confidence: 93%

Assimilation dynamics of soil carbon and nitrogen by wheat roots and Collembola

Larsen

Gorissen²,

Krogh

et al. 2007

Plant Soil

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“…Based on the importance for utilization by soil microbes, there are three main carbon sources in forest ecosystems: plant root exudates, litter, and soil organic matter (Ruf et al 2006). As a result, either understory or litter is of paramount importance to maintain a large amount of soil microbe biomass.…”

Section: Effects Of Understory Removal On Soil Physical and Chemical mentioning

confidence: 99%

“…Litter cover acts as a protective layer for maintaining soil physical properties, like retention for soil moisture (Ginter et al 1979), buffering against soil temperature and compaction change (MacKinney 1929), and soil conservation from erosion or leaching (Geddes and Dunkerley 1999;Mo et al 2003). Litter also provides habitats and substrates for soil fauna (Attignon et al 2004) and microorganisms (Ruf et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Impacts of litter and understory removal on soil properties in a subtropical Acacia mangium plantation in China

et al. 2008

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In forest ecosystems, the effects of litter or understory on soil properties are far from being fully understood. We conducted a study in a pure Acacia mangium Willd. plantation in southern China, by removing litter or understory or both components and then comparing these treatments with a control (undisturbed), to evaluate their respective effects on soil physical, chemical and biological properties. In addition, a litter decomposition experiment was conducted to understand the effects of understory on litter decomposition. Our data showed that the presence of understory favored litter decomposition to a large extent. In 1 year, 75.2 and 37.

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“…Therefore, soil quality can be assessed by physical, chemical and microbiological properties of soil together with the abundance and diversity of edaphic fauna (nematodes, Acari, Collembola, Symphyla, Chilopoda, Pauropoda, enchytraeids, earthworms); furthermore, the determination of community structure adds significant information on the soil status (Cole et al, 2006;De Goede and Brussard, 2002;Duelli and Obrist, 2003;Menta et al, 2008;van Straalen, 1998;Yan et al, 2012). In a well-balanced soil, mesofauna is highly biodiversified and occupies all trophic levels within the soil food webs (Ruf et al, 2006). Therefore, the loss of mesofauna diversity is a negative consequence on soil biota, since it is involved in fundamental ecosystem services such as nutrient cyclings Narula et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

Case study of microarthropod communities to assess soil quality in different managed vineyards

Gagnarli¹,

Goggioli²,

Tarchi³

et al. 2015

SOIL

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Abstract. Land use influences the abundance and diversity of soil arthropods. The evaluation of the impact of different management strategies on soil quality is increasingly sought, and the determination of community structures of edaphic fauna can represent an efficient tool. In the area of Langhe (Piedmont, Italy), eight vineyards characterized for physical and chemical properties (soil texture, soil pH, total organic carbon, total nitrogen, calcium carbonate) were selected. We evaluated the effect of two types of crop management, organic and integrated pest management (IPM), on abundance and biodiversity of microarthropods living at the soil surface. Soil sampling was carried out in winter 2011 and spring 2012. All specimens were counted and determined up to the order level. The biodiversity analysis was performed using ecological indexes (taxa richness, dominance, Shannon-Wiener, Buzas and Gibson's evenness, Margalef, equitability, Berger-Parker), and the biological soil quality was assessed with the BSQ-ar index.The mesofauna abundance was affected by both the type of management and sampling time. On the whole, a higher abundance was in organic vineyards (N = 1981) than in IPM ones (N = 1062). The analysis performed by ecological indexes showed quite a high level of biodiversity in this environment, particularly in May 2012. Furthermore, the BSQ-ar values registered were similar to those obtained in preserved soils.

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Carbon fluxes in soil food webs of increasing complexity revealed by 14C labelling and 13C natural abundance

Cited by 88 publications

References 46 publications

Assimilation dynamics of soil carbon and nitrogen by wheat roots and Collembola

Assimilation dynamics of soil carbon and nitrogen by wheat roots and Collembola

Impacts of litter and understory removal on soil properties in a subtropical Acacia mangium plantation in China

Case study of microarthropod communities to assess soil quality in different managed vineyards

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