Effects of liming and mineral N on initial decomposition of soil organic matter and post harvest root residues of poplar

Wachendorf, Christine

doi:10.1016/j.geoderma.2015.06.013

Cited by 28 publications

(16 citation statements)

References 48 publications

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“…It is known that agricultural liming tends to improve soil cation exchange capacity, ultimately increasing aboveground productivity (Johnson et al 2005, Fornara et al 2011) rather than root productivity. Our results also show that liming was associated with higher root decomposition, which could be driven by liming-induced increases in nutrient availability and cycling (Rangel-Castro et al 2005, Mijangos et al 2010, Wachendorf 2015. Our evidence is that liming contributed to increase the mineralization of N in decomposing root material ( Fig.…”

Section: Discussionsupporting

confidence: 68%

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Long‐term belowground effects of grassland management: the key role of liming

Heyburn

McKenzie

Crawley

et al. 2017

Ecological Applications

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The functioning of human-managed grassland ecosystems strongly depends on how common management practices will affect grassland "belowground compartment" including soil biogeochemistry and plant roots. Key questions remain about how animal grazing, liming (e.g., the addition of CaCO to soils), and nutrient fertilization might affect, in the long-term, soil nutrient cycling and multiple root traits. Here we focus on a mesotrophic grassland located in Berkshire, UK, where contrasting levels of rabbit grazing, liming, and different inorganic fertilizers have been applied since 1991. We ask how (1) soil nitrogen (N) availability and cycling, (2) total root mass, (3) root mass decomposition, and (4) arbuscular mycorrhizal fungal (AMF) root colonization might respond to 22 years of very different management. We found that liming strongly affected total root mass, root decomposition, root AMF colonization as well as soil N availability and cycling and that these effects were mainly driven by liming-induced increases in soil pH. Increases in soil pH were associated with significant (1) decreases in root mass, (2) increases in root mass decomposability and in the mineralization of N in decomposing root detritus, and (3) increases in AMF infection. Soil pH was also significantly related to greater N availability (i.e., soil NO levels) and to lower δ N natural abundance, which suggests more efficient N uptake by plants in limed soils as we found in our study. The application of multiple nutrients (N, P, K, Mg) also reduced total root mass, while N-only fertilization was associated with greater AMF infection. Surprisingly the long-term impact of grazing was generally weak and not significant on most plant and soil parameters. Despite soil pH affecting most belowground variables, changes in soil pH were not associated with any change in soil C and N stocks. Because liming can improve nutrient cycling (and benefits soil pH and grass yields) without negatively affecting soil C sequestration, we suggest that regular liming applications may provide management solutions for increasing the long-term sustainability of permanent grassland.

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Section: Discussionsupporting

confidence: 68%

“…, Mijangos et al. , Wachendorf ). Our evidence is that liming contributed to increase the mineralization of N in decomposing root material (Fig.…”

Section: Discussionmentioning

confidence: 99%

Long‐term belowground effects of grassland management: the key role of liming

Heyburn

McKenzie

Crawley

et al. 2017

Ecological Applications

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“…Conversely, reducing tillage intensity frequently results in an increased C sequestration (Alvarez, ; Mangalassery et al ., ). Decomposing root systems may contribute to C sequestration and increase soil fertility (Van Lear et al ., ), but eventually provoke negative effects, like an immobilization of nitrogen (Toenshoff et al ., ; Wachendorf, ). However, until now effects of conversion of SRC on plant yields of subsequent cultivated agricultural crops have not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Influence of land use and tillage depth on dynamics of soil microbial properties, soil carbon fractions and crop yield after conversion of short‐rotation coppices

Wachendorf

Stuelpnagel

Wachendorf

2017

Soil Use and Management

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The effect of conversion of short-rotation coppices (SRCs) to agricultural land on soil organic carbon (SOC), soil microbial properties and crop yield is largely unknown. The objective of this study was to assess the effects of subsequent land use and tillage depth after conversion of SRCs on (i) total SOC (ii) soil C fractions with differentiation of total harvest residues and woody harvest residues from SRC and maize by 13 C analysis and (iii) dry matter and N yield of grassland and maize. For this purpose, field trials were established after conversion of SRCs at three sites in Germany and cultivated with maize and grassland with shallow (5 cm), medium (15 cm) and deep tillage depth (30 cm). Crops were sampled for 5 yrs, and soil samples were collected at a depth of 0-5, 5-15 and 15-30 cm. Amount of total carbon and soil carbon fractions immediately and 4 yrs after conversion of SRC were compared. Tillage depth had no effect on dry matter yield of maize and grassland. The amount of woody harvest residues decreased over time following conversion at all sites irrespective of land use or tillage depth, but SOC decreased only at one site. Microbial biomass was particularly sensitive to land use, but microorganisms reacted differently to tillage depth depending on the soil conditions. Our results reveal that decomposition of woody harvest residues is rapid and that effects of tillage and land use on different soil C-pools are site specific.

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“…Liming has the potential to decrease C mineralization of SOM and plant residues, but mineral N has a positive effect on increasing CO 2 derived from organic matter. However, N effect was cancelled out if lime and N were applied simultaneously (Wachendorf, 2015).…”

Section: Resultsmentioning

confidence: 99%

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2017

Columella

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Effects of liming and mineral N on initial decomposition of soil organic matter and post harvest root residues of poplar

Cited by 28 publications

References 48 publications

Long‐term belowground effects of grassland management: the key role of liming

Long‐term belowground effects of grassland management: the key role of liming

Influence of land use and tillage depth on dynamics of soil microbial properties, soil carbon fractions and crop yield after conversion of short‐rotation coppices

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