Experimental removal and addition of leaf litter inputs reduces nitrate production and loss in a lowland tropical forest

Wieder, William R.; Cleveland, Cory C.; Taylor, Phillip; Nemergut, Diana R.; Hinckley, Eve‐Lyn S.; Philippot, Laurent; Bru, David; Weintraub, Samantha R.; Martín, M. Ángeles Muñoz; Townsend, Alan R.

doi:10.1007/s10533-012-9793-1

Cited by 39 publications

(51 citation statements)

References 87 publications

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“…After 6 years of litter manipulation, surface soils (0-10 cm) had lower NO 3 and K in litter removal plots and higher NO 3 and Zn in litter addition plots; other nutrients were not significantly affected (Sayer et al, 2012). In Costa Rica after 2.5 years of litter manipulation, surface soils (0-10 cm) had lower net nitrification in both litter removal and addition treatments, while NH 4 concentrations were significantly lower in litter removal plots (NH 4 was 83-91 % of the extractable N; Wieder et al, 2013). Thus, several soil nutrients in surface soils change following litter manipulation, but there is no consistent pattern for N, very little data for P or cations (the latter were not reported for the Costa Rican experiment), and no data for soils deeper than 10 cm.…”

Section: Introductionmentioning

confidence: 88%

“…In the nutrient addition experiment, Koehler et al (2012) reported that NH 4 also decreased less with depth (at 200 cm it was 41 % of surface soils) than NO 3 (to 17 % of surface soils) and that NH 4 was the dominant form of total inorganic N (about 80 %) -the same patterns as in our litter manipulation experiment. Nitrogen dynamics in soils have also been measured in a litter manipulation experiment in Costa Rica (Wieder et al, 2013), where nitrification rates were lower in both litter removal and litter addition plots and extractable NH 4 was significantly lower in litter removal plots. This contrasts with our results of greater NO 3 in litter addition compared to litter removal and no effect on NH 4 ; the differences between the experiments might be due in part to different soils and a wetter climate in Costa Rica (ca.…”

Section: Litter Manipulation -Depth Of Effectsmentioning

confidence: 99%

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Changes in soil carbon and nutrients following 6 years of litter removal and addition in a tropical semi-evergreen rain forest

2016

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Abstract. Increasing atmospheric CO 2 and temperature may increase forest productivity, including litterfall, but the consequences for soil organic matter remain poorly understood. To address this, we measured soil carbon and nutrient concentrations at nine depths to 2 m after 6 years of continuous litter removal and litter addition in a semi-evergreen rain forest in Panama. Soils in litter addition plots, compared to litter removal plots, had higher pH and contained greater concentrations of KCl-extractable nitrate (both to 30 cm); Mehlich-III extractable phosphorus and total carbon (both to 20 cm); total nitrogen (to 15 cm); Mehlich-III calcium (to 10 cm); and Mehlich-III magnesium and lower bulk density (both to 5 cm). In contrast, litter manipulation did not affect ammonium, manganese, potassium or zinc, and soils deeper than 30 cm did not differ for any nutrient. Comparison with previous analyses in the experiment indicates that the effect of litter manipulation on nutrient concentrations and the depth to which the effects are significant are increasing with time. To allow for changes in bulk density in calculation of changes in carbon stocks, we standardized total carbon and nitrogen on the basis of a constant mineral mass. For 200 kg m −2 of mineral soil (approximately the upper 20 cm of the profile) about 0.5 kg C m −2 was "missing" from the litter removal plots, with a similar amount accumulated in the litter addition plots. There was an additional 0.4 kg C m −2 extra in the litter standing crop of the litter addition plots compared to the control. This increase in carbon in surface soil and the litter standing crop can be interpreted as a potential partial mitigation of the effects of increasing CO 2 concentrations in the atmosphere.

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Section: Introductionmentioning

confidence: 88%

Section: Litter Manipulation -Depth Of Effectsmentioning

confidence: 99%

Changes in soil carbon and nutrients following 6 years of litter removal and addition in a tropical semi-evergreen rain forest

2016

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“…We focused on genes involved in nitrogen (N) cycling as well as measurements of nitrification, dissimilatory nitrate reduction to ammonium (DNRA), and nitrous oxide (N 2 O) emission rates determined using 15-N tracers. All data were generated from soils collected in May (early wet season) and October (late wet season) from a lowland tropical forest on the Osa Peninsula, Costa Rica (8 43 0 N, 83 37 0 W; Wieder et al, 2013). Abundances of genes involved in nitrification (bacterial and Thaumarchaeota amoA), nitrate reduction (narG and napA), nitrogen fixation (nifH), and denitrification (a likely source of N 2 O emissions; nirS, nirK, and nosZ) were used as proxies of microbial trait abundances, as described by Wieder et al (2013).…”

Section: Introductionmentioning

confidence: 99%

“…All data were generated from soils collected in May (early wet season) and October (late wet season) from a lowland tropical forest on the Osa Peninsula, Costa Rica (8 43 0 N, 83 37 0 W; Wieder et al, 2013). Abundances of genes involved in nitrification (bacterial and Thaumarchaeota amoA), nitrate reduction (narG and napA), nitrogen fixation (nifH), and denitrification (a likely source of N 2 O emissions; nirS, nirK, and nosZ) were used as proxies of microbial trait abundances, as described by Wieder et al (2013). Edaphic factors, including pH, moisture, NO 3 À and NH 4 þ pools, and total C and N content were collected to describe environmental conditions (Wieder et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Abundances of genes involved in nitrification (bacterial and Thaumarchaeota amoA), nitrate reduction (narG and napA), nitrogen fixation (nifH), and denitrification (a likely source of N 2 O emissions; nirS, nirK, and nosZ) were used as proxies of microbial trait abundances, as described by Wieder et al (2013). Edaphic factors, including pH, moisture, NO 3 À and NH 4 þ pools, and total C and N content were collected to describe environmental conditions (Wieder et al, 2013). Because only a subset of the data for which we had qPCR data were used, some of the relationships identified here vary slightly from those presented in Wieder et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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Do we need to understand microbial communities to predict ecosystem function? A comparison of statistical models of nitrogen cycling processes

Graham

Wieder

Leff

et al. 2014

Soil Biology and Biochemistry

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155

104

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The characteristics of soil N transformations regulate the composition of hydrologic N export from terrestrial ecosystem

et al. 2016

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It is important to clarify the quantity and composition of hydrologic N export from terrestrial ecosystem and its primary controlling factors, because it affected N availability, productivity, and C storage in natural ecosystems. The most previous investigations were focused on the effects of N deposition and human disturbance on the composition of hydrologic N export. However, few studies were aware of whether there were significant differences in the concentrations and composition of hydrologic N export from natural ecosystems in different climate zones and what is the primary controlling factor. In the present study, three natural forest ecosystems and one natural grassland ecosystem that were located in different climate zones and with different soil pH range were selected. The concentrations of total dissolved N, dissolved organic nitrogen (DON), NH4+, NO3− in soil solution and stream water, soil properties, and soil gross N transformation rates were measured to answer above questions. Our results showed that NO3− concentrations and the composition pattern of hydrologic N export from natural ecosystems varied greatly in the different climate zones. The NO3− concentrations in stream water varied largely, ranging from 0.1 mg N L−1 to 1.6 mg N L−1, while DON concentration in stream water, ranging from 0.1 to 0.9 mg N L−1, did not differ significantly, and the concentrations of NH4+ were uniformly low (average 0.1 mg N L−1) in all studied sites. There was a trade‐off relationship between the proportions of NO3− and DON to total dissolved N in stream water. In subtropical strongly acidic forests soil site, DON was the dominance in total dissolved N in stream water, while NO3−‐N became dominance in temperate acidic forests soil site, subtropical alkaline forests soil region, and the alpine meadow sites on the Tibetan Plateau. The proportions of NO3− to total dissolved N in both soil solution and stream water significantly increased with the increasing of the gross autotrophic nitrification rates (p < 0.01). Our results indicated that the characteristics of soil N transformations were the most primary factor regulating the composition of hydrologic N losses from ecosystems. The nitrification was the central soil N transformation processes regulating N composition in soil solution and hydrologic N losses. These results provided important information on understanding easily the composition of hydrologic N export from terrestrial ecosystem.

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Experimental removal and addition of leaf litter inputs reduces nitrate production and loss in a lowland tropical forest

Cited by 39 publications

References 87 publications

Changes in soil carbon and nutrients following 6 years of litter removal and addition in a tropical semi-evergreen rain forest

Changes in soil carbon and nutrients following 6 years of litter removal and addition in a tropical semi-evergreen rain forest

Do we need to understand microbial communities to predict ecosystem function? A comparison of statistical models of nitrogen cycling processes

The characteristics of soil N transformations regulate the composition of hydrologic N export from terrestrial ecosystem

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