Variability of nitrification potentials in patches of undergrowth vegetation in primary Scots pine stands

Boer, Wietse de; Kester, R.A.

doi:10.1016/s0378-1127(96)03789-9

Cited by 15 publications

(4 citation statements)

References 32 publications

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“…This result is similar to that of DeBoer and Kester (1996) who found that differences in vegetation patches, herbaceous to ericaceous, did not significantly influence rates of nitrification. In contrast to our work, De Boer and Kester (1996) showed no relationship between nitrification and the presence of Empetrum nigrum. However, E. nigrum is known to not produce the putative allelopathic compound batatasin-III (see Nilsson et al 2000).…”

Section: Discussioncontrasting

confidence: 99%

Nitrogen mineralization and phenol accumulation along a fire chronosequence in northern Sweden

2002

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Scots pine (Pinus sylvestris L.) forests of northern Sweden are often considered to be N limited. This limitation may have been exacerbated by the elimination of wildfire as a natural disturbance factor in these boreal forests. Phenolic inhibition of N mineralization and nitrification (due to litter and exudates of ericaceous shrubs) has been proposed as a mechanism for N limitation of these forests, but this hypothesis remains largely untested. N mineralization rates, nitrification rates, and sorption of free phenolic compounds were assessed along a fire-induced chronosequence in northern Sweden. A total of 34 forest stands varying in age since the last fire were identified and characterized. Overstorey and understorey vegetative composition and depth of humus were analysed in replicated plots at all 34 sites. Eight of the forest stands aged 3-352 years since the last fire were selected for intensive investigation in which ten replicate ionic resin capsules (used to assess net N mineralization and nitrification) and non-ionic carbonaceous resin capsules (used to assess free phenolic compounds) were installed at the interface of humus and mineral soil. A highly significant correlation was observed between site age and net sorption of inorganic N to resin capsules. Net accumulation of NH and NO on resin capsules followed a linear decrease (R =0.61, P<0.01) with time perhaps as a result of increased N immobilization with successional C loading. NO sorption to resin capsules followed a logarithmic decrease (R =0.80, P<0.01) that may be related to a logarithmic increase in dwarf shrub cover and decreased soil charcoal sorption potential along this chronosequence. A replicated field study was conducted at one of the late successional field sites to assess the influence of charcoal and an added labile N source on N turnover. Three rates of charcoal (0, 100, and 1,000 g M) and two rates of glycine (0 and 50 g N as glycine M) were applied in a factorial design to microplots in a randomized complete block pattern. Net ammonification (as assessed by NH sorption to resins) was readily increased by the addition of a labile N source, but this increase in NH did not stimulate nitrification. Nitrification was stimulated slightly by the addition of charcoal resulting in similar levels of resin-sorbed NO as those found in early successional sites. Resin-sorbed polyphenol concentrations were decreased with charcoal amendments, but were actually increased with N amendments (likely due to decomposition of polyphenols). Net N mineralization appears to be limited by rapid NH immobilization whereas nitrification is limited by the lack of an appropriate environment or by the presence of inhibitory compounds in late successional forests of northern Sweden.

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Section: Discussioncontrasting

confidence: 99%

Nitrogen mineralization and phenol accumulation along a fire chronosequence in northern Sweden

2002

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“…De Boer and Kester (1996) found no indications that the relatively high content of polyphenolics in dwarf shrubs was important as a regulator of the nitrification process. In some laboratory experiments, polyphenols or condensed tannins inhibited nitrification in soil (Lodhi and Killingbeck 1980;Baldwin et al 1983;Kraal et al 2009); but in other experiments there was no effect (McCarty and Bremner 1986).…”

Section: Tannins Affect Soil Microbial Processes In Several Ways and mentioning

confidence: 98%

Nitrogen transformations in boreal forest soils—does composition of plant secondary compounds give any explanations?

Smolander¹,

Kanerva

Adamczyk³

et al. 2011

Plant Soil

121

103

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Two major groups of plant secondary compounds, phenolic compounds and terpenes, may according to current evidence mediate changes in soil C and N cycling, but their exact role and importance in boreal forest soils are largely unknown. In this review we discuss the occurrence of these compounds in forest plants and soils, the great challenges faced when their concentrations are measured, their possible effects in regulating soil C and N transformations and finally, we attempt to evaluate their role in connection with certain forest management practices. In laboratory experiments, volatile monoterpenes, in the concentrations found in the coniferous soil atmosphere, have been shown to inhibit net nitrogen mineralization and nitrification; they probably provide a C source to part of the soil microbial population but are toxic to another part. However, there is a large gap in our knowledge of the effects of higher terpenes on soil processes. According to results from laboratory experiments, an important group of phenolic compounds, condensed tannins, may also affect microbial processes related to soil C and N cycling; one mechanism is binding of proteins and certain other organic N-containing compounds. Field studies revealed interesting correlations between the occurrence of terpenes or phenolic compounds and C or net N mineralization in forest soils; in some cases these correlations point in the same direction as do the results from laboratory experiments, but not always. Different forest management practices may result in changes in both the quantity and quality of terpenes and phenolic compounds entering the soil. Possible effects of tree species composition, clear-cutting and removal of logging residue for bioenergy on plant secondary compound composition in soil are discussed in relation to changes observed in soil N transformations.

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“…The studies revealed that the N min levels vary between different plant species. Ewel also found differences in N min under different trees in the plantation (P = 0.025) in the absence of an interactive effect of the species and their rotation (P = 0.196), indicating that the species is the determining factor [54] .…”

Section: Ecosystem/vegetationmentioning

confidence: 90%

“…Only one study considered crop rotation [54] and found it to impact N min significantly. When comparing cultivated versus uncultivated soils, the former had a higher N min (P < 0.001).…”

Section: Managementmentioning

confidence: 99%

Importance and inconsistencies of the influence of soil properties on nitrogen mineralization: a systematic review

Mendoza-Carreón¹,

Márgez²,

Osuna-Ávila³

et al. 2023

Soil Health

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Climate and soil properties profoundly impact N mineralization (Nmin). Hence, there is a critical need to identify how physical-chemical-biological factors involved in organic matter decomposition influence globally reported predictive models. This paper reflects research focused on those factors considered relevant and used during the construction of Nmin models. The literature data found on factors affecting Nmin or N availability in soils published since 1990 was downloaded to a database in Access. Using different bivariate and multivariate statistical techniques, we compiled results of 785 statistical analyses presented by authors of 90 research articles that related Nmin and environmental factors, management strategies, and soil biological and physicochemical attributes. For organization purposes, we decided to group results according to the similarity of properties related to mineralization into environmental factors (18.6%), ecosystem/vegetation (14.52%), management (7.64%), soil physicochemical properties (34.65%), organic matter (16.05%), and microbiota (6.37%). The measurements of the response variables were 16.2% using N content in soil (as ammonium, nitrates, Organic N and Total N), and 83.88% represent N in the process of mineralization, including potentially mineralized N. As Nmin is the dependent variable, the results included 109 independent variables, of which 47.7% presented seemingly inconsistent results, which means different effects in Nmin. The difference in results was found to be related mostly to a difference in ecosystems or variable interactions. We conclude that acquiring a general prediction model for Nmin or constructing a specific equation for local conditions poses a limitation to optimizing N management for crop production. A more useful strategy is to generate a prediction model for Nmin, including significative soil and weather conditions, within a region and ecosystem; thus, the information can support soil and crop management decisions.

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Variability of nitrification potentials in patches of undergrowth vegetation in primary Scots pine stands

Cited by 15 publications

References 32 publications

Nitrogen mineralization and phenol accumulation along a fire chronosequence in northern Sweden

Nitrogen mineralization and phenol accumulation along a fire chronosequence in northern Sweden

Nitrogen transformations in boreal forest soils—does composition of plant secondary compounds give any explanations?

Importance and inconsistencies of the influence of soil properties on nitrogen mineralization: a systematic review

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