Effects of phosphorus addition on N&lt;sub&gt;2&lt;/sub&gt;O emissions from an &lt;i&gt;Acacia mangium&lt;/i&gt; soil in relatively aerobic condition

Mori, Taiki; Ishizuka, Shigehiro; Konda, Ryota; Wicaksono, Agus; Heriyanto, Joko; Hardjono, Arisman; Ohta, Seiichi

doi:10.3759/tropics.ms15-15

Cited by 14 publications

(8 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our result is supported by some previous studies. For example, Mori et al (2016) found that CO 2 emission rates in tropical forest soils were stimulated by P addition at high C concentrations (1 mg C/g soil was added as glucose) but not at low C conditions (0.1 mg g −1 soil), whereas Qian et al (2016) reported that there was no response of soil microbial CO 2 emission to P addition. Indeed, in this study, the EV-RT soil in Puerto Rico with the highest C content (7.21%) showed the strongest response to P addition among the four soils.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Hui

Porter

Phillips

et al. 2020

European J Soil Science

View full text Add to dashboard Cite

Ecosystem functional responses such as soil CO 2 emissions are constrained by microclimate, available carbon (C) substrates and their effects upon microbial activity. In tropical forests, phosphorus (P) is often considered as a limiting factor for plant growth, but it is still not clear whether P constrains microbial CO 2 emissions from soils. In this study, we incubated seven tropical forest soils from Brazil and Puerto Rico with different nutrient addition treatments (no addition, Control; C, nitrogen (N) or P addition only; and combined C, N and P addition (CNP)). Cumulative soil CO 2 emissions were fit with a Gompertz model to estimate potential maximum cumulative soil CO 2 emission (C m ) and the rate of change of soil C decomposition (k). Quantitative polymerase chain reaction (qPCR) was conducted to quantify microbial biomass as bacteria and fungi. Results showed that P addition alone or in combination with C and N enhanced C m , whereas N addition usually reduced C m , and neither N nor P affected microbial biomass. Additions of CNP enhanced k, increased microbial abundances and altered fungal to bacterial ratios towards higher fungal abundance. Additions of CNP, however, tended to reduce C m for most soils when compared to C additions alone, suggesting that microbial growth associated with nutrient additions may have occurred at the expense of C decomposition. Overall, this study demonstrates that soil CO 2 emission is more limited by P than N in tropical forest soils and those effects were stronger in soils low in P. Highlights• A laboratory incubation study was conducted with nitrogen, phosphorus or carbon addition to tropical forest soils. Soil CO 2 emission was fitted with a Gompertz model and soil microbial abundance was quantified using qPCR. Phosphorus addition increased model parameters C m and soil CO 2 emission, particularly in the Puerto Rico soils. Soil CO 2 emission was more limited by phosphorus than nitrogen in tropical forest soils.

show abstract

Section: Discussionmentioning

confidence: 99%

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Hui

Porter

Phillips

et al. 2020

European J Soil Science

View full text Add to dashboard Cite

show abstract

“…Twenty bottles (4 subplots × 5 time-series) were placed in a cold room (3°C) for 5, 13, 23, 58, and 90 days. Water evaporation was prevented by covering bottles with polyethylene sheets (Mori et al, 2016). After incubation, tea bags were immediately oven-dried for few days to stop further decomposition.…”

Section: Methodsmentioning

confidence: 99%

Validation of the Tea Bag Index as a standard approach for assessing organic matter decomposition

Mori

2022

Preprint

Self Cite

View full text Add to dashboard Cite

The Tea Bag Index (TBI), a novel approach to assessing organic matter decomposition using commercial tea bags, has been increasingly utilized as a standard method in academic studies worldwide. This approach was designed to obtain an early-stage decomposition constant (k) indicative of early-stage decomposition rates and a litter stabilization factor (S) indicative of long-term carbon stability by using two types of teas—green and rooibos. However, despite the worldwide usage of the method, the accuracy of this approach has never been validated in terrestrial ecosystems. Here, the validity of this approach was tested by examining the two essential premises of the TBI using a laboratory incubation experiment. The first premise of the TBI—namely, that the unstabilized hydrolyzable fraction of green tea is mostly decomposed within 90 days—did not hold in the present study, which caused overestimations of the S of rooibos tea, as well as k. The second premise—namely, that the ratio of stabilized to total hydrolyzable fractions (i.e., S) of rooibos tea is equal to that of green tea—was also rejected, which resulted in substantial underestimations of the S of rooibos tea and k. Overall, the TBI largely underestimated the S of rooibos tea and k (more than 1.5 and 5 times smaller than those determined by time-series data, respectively). The present study suggests that time-series mass loss data of rooibos tea should be obtained to accurately determine k, rather than assuming that the S of rooibos tea is equal to that of green tea.

show abstract

“…The samples were incubated for 142.6 h at 20°C in the dark. At the start of the incubation, all bottles were covered with polyethylene plastic wrap to prevent water evaporation (Mori et al 2016a).…”

Section: Incubationmentioning

confidence: 99%

Testing potassium limitation on soil microbial activity in a sub-tropical forest

Mori

Wang

et al. 2018

J. For. Res.

Self Cite

View full text Add to dashboard Cite

Because potassium (K) is a rock-derived essential element that can be depleted in highly-weathered tropical soils, K availability may limit some portion of soil microbial activity in tropical forest ecosystems. In this paper we tested if K limits microbial activity in the condition of sufficient labile C supply. An incubation experiment was performed using surface soil samples (0-10 cm depth) obtained from four permanent ecological research plots in a natural subtropical forest in southern China. Soil samples were taken in September 2016. Heterotrophic soil respiration rates and microbial biomass were measured after the addition of glucose (both D and L) with and without K (potassium chloride). We did not observe any effects of K addition on soil microbial respiration, suggesting that K does not limit the microbial activity in the condition of sufficient labile C supply. The lack of microbial response to added K can be attributed to the high mobility of K in forest ecosystems, which may have provided sufficient K to microbes in our soil samples (already provided at the beginning of the incubation). However, at the present stage, we cannot conclude that K is not a limiting factor of soil microbial activity in other tropical forest ecosystems because of the heterogeneity of tropical forest ecosystems and few observations. The hypothesis needs to be tested in larger numbers of tropical forests.

show abstract

Effects of phosphorus addition on N<sub>2</sub>O emissions from an <i>Acacia mangium</i> soil in relatively aerobic condition

Cited by 14 publications

References 28 publications

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Validation of the Tea Bag Index as a standard approach for assessing organic matter decomposition

Testing potassium limitation on soil microbial activity in a sub-tropical forest

Contact Info

Product

Resources

About

Effects of phosphorus addition on N<sub>2</sub>O emissions from an <i>Acacia mangium</i> soil in relatively aerobic condition

Cited by 14 publications

References 28 publications

Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

Phosphorus rather than nitrogen enhances CO2 emissions in tropical forest soils: Evidence from a laboratory incubation study

Validation of the Tea Bag Index as a standard approach for assessing organic matter decomposition

Testing potassium limitation on soil microbial activity in a sub-tropical forest

Contact Info

Product

Resources

About

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study

Phosphorus rather than nitrogen enhances CO₂ emissions in tropical forest soils: Evidence from a laboratory incubation study