Nitrogen and phosphorus supply controls soil organic carbon mineralization in tropical topsoil and subsoil

Meyer, Nele; Welp, Gerhard; Rodionov, Andrei; Borchard, Nils; Martius, Christopher; Amelung, Wulf

doi:10.1016/j.soilbio.2018.01.024

Cited by 110 publications

(82 citation statements)

References 70 publications

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“…In the young plantation, the quickly accumulated plant biomass needs a large amount of nutrients (Chen et al 2017). However, in the mature plantation, a greater amount of the soil LOC derived from understory plants is likely to be retained due to the greater nutrient availability and/or the relatively slower plant growth, which may also reduce nutrient acquisition and the mineralization of organic matter (Meyer et al 2018). Thus, the decomposition of soil organic matter may be enhanced to meet the need for a large amount of nutrients (Hobbie 2015, Mueller et al 2016.…”

Section: Discussionmentioning

confidence: 99%

“…This could explain our previous finding that both the canopy trees and understory plants stimulate soil respiration in the young plantation ; that is, the increased soil respiration may be related with the rapidly mineralization of new LOC. However, in the mature plantation, a greater amount of the soil LOC derived from understory plants is likely to be retained due to the greater nutrient availability and/or the relatively slower plant growth, which may also reduce nutrient acquisition and the mineralization of organic matter (Meyer et al 2018). This explains our previous observation that the presence of understory plants did not affect soil respiration in the mature plantation ).…”

Section: Discussionmentioning

confidence: 99%

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Labile C dynamics reflect soil organic carbon sequestration capacity: Understory plants drive topsoil C process in subtropical forests

et al. 2019

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The huge background pool of soil organic carbon (SOC) is likely to impede the ready detection of SOC changes. We propose to explore SOC changes by monitoring the dynamics of soil labile organic carbon (LOC); namely if LOC could be largely retained in soils rather than respired rapidly, the SOC would be ready to be sequestered. The effects of the two major functional groups of plants, that is, canopy trees and understory plants, on SOC accumulation were then illustrated with this LOC-based approach. The characteristics of LOC and SOC of topsoils (0-20 cm) in a field manipulation experiment with 5-yr treatments of understory removal and tree girdling in both a young and a mature Eucalyptus plantations were examined. The concentration and potential turnover time of soil LOC were used to indicate the state of vegetation-induced C accumulation in soils, which were estimated by a sequential fumigation-incubation procedure. Soil natural abundances of 13 C and 15 N were measured to reflect the proportion of newly retained LOC in soils. We found that, in the young plantation, understory removal did not significantly affect both soil LOC and SOC concentrations, but significantly increased the potential turnover time of soil LOC. In contrast, in the mature plantation, understory removal significantly decreased soil LOC and SOC concentrations, but did not significantly alter the potential turnover time of soil LOC. However, tree girdling did not significantly affect SOC concentration, soil LOC concentration, or potential turnover time in either the young plantation or the mature plantation. These results demonstrated that understory plantderived C was one of the major components of LOC pool in topsoils, and it may be readily mineralized in the young plantation but accumulated as an important fraction of SOC in the mature plantation. This study suggests that the LOC-based approach is potentially useful in monitoring SOC changes and improves our understanding of how plant functional groups and soil fertility status could jointly affect LOC and SOC dynamics. In considering the great contribution of understory plants to SOC processes, we propose that understory plants should be maintained in subtropical plantation ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Labile C dynamics reflect soil organic carbon sequestration capacity: Understory plants drive topsoil C process in subtropical forests

et al. 2019

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“…Soil texture, total N, available N, and pH, are key factors modulating the effect of N fertilizer on wheat yield. Soil texture is an important soil parameter that affects crop productivity, due to its significant influence on N mineralization [33], soil organic matter storage [34], crop N requirements [35], and microbial biomass [36]. Our results showed that there was a greater increase in yield under conditions of coarse soil texture versus fine and medium soil textures ( Figure 7A).…”

Section: Soil Factorsmentioning

confidence: 70%

Synthesis of Climate, Soil Factors, and Nitrogen Management Practices Affecting the Responses of Wheat Productivity and Nitrogen Use Efficiency to Nitrogen Fertilizer in China

et al. 2018

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The reported effects of nitrogen (N) fertilizer on wheat yield and nitrogen use efficiency (NUE) vary greatly, due to differences in climate, soil factors, and N management practices in different regions of China. We collected literature published during 1950-2017 that reported the yield and NUE for wheat in China, under N application and control treatments, and analyzed the data therein. A significant increase in yield was observed with N application, and varied with climate, soil factors, and N management practices in different regions. A larger increase in yield was observed under an average annual temperature of 13-15 • C, an average annual precipitation of >800 mm, respectively. Greater yield-increasing effects were observed in soil with a coarse soil texture, lower soil total N, available N, and a soil pH of ≤7 and >8, respectively. In Northwest China, the yield increase was greater under multiple coated urea applications after anthesis, while the higher NUE was observed under single coated urea application before anthesis. In North China, the yield and NUE were greater under multiple coated urea applications before anthesis. In South China, the yield and NUE were greater under multiple N applications. Consequently, to improve wheat yield and NUE, site-specific N management practices should be adopted.

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“…There are two possible reasons for the increase of Q 10 . Firstly, the root respiration substrate is derived from the distribution of photosynthetic products to the underground (Meyer et al 2018), and Ra is closely related to the supply of photosynthetic substrate (Aaltonen et al 2016). Photosynthesis depends on a variety of enzymes, and higher temperature can accelerate the enzymatic reaction and promote photosynthesis.…”

Section: Effects Of N Addition On Q 10mentioning

confidence: 99%

Effects of long-term nitrogen addition on soil respiration and its components in a boreal forest

Liu

Yan

et al. 2020

Preprint

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Background Atmospheric nitrogen (N) deposition in boreal forest ecosystems increased gradually with the development of industry and agriculture, but the effects of N input on soil CO2 fluxes in these ecosystems were rarely reported in previous studies. To evaluate the effect of N addition on soil respiration is of great significance for understanding the distribution of soil carbon (C) on the N gradient in forest ecosystems.Results In this study, four treatment levels of N addition (0, 25, 50, 75 kg N ha− 1 yr− 1) were applied to natural Larix gmelinii forest in Greater Khingan Mountains of northeast China. We focused mainly on the dynamics of soil respiration (Rs), heterotrophic respiration (Rh), autotrophic respiration (Ra), microbial biomass C and N (MBC and MBN) and fine root biomass (FRB) in a growing season. We found that low N addition significant increased Rs, Rh and Ra, but with the increase of N addition, the promotion effect was gradually weakened. Medium N increased the temperature sensitivity (Q10) of Rs and Rh components, while medium N and high N significantly reduced the Q10 of Ra. Ra was positively correlated with FRB; Rh was positively correlated with soil MBC and MBN; and RS was probably driven by Ra from May to July, while by Rh in August and September.Conclusions Long-term N addition alleviated microbial N limitation, promoted soil respiration and accelerated soil C and N cycle in boreal forest ecosystems.

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Nitrogen and phosphorus supply controls soil organic carbon mineralization in tropical topsoil and subsoil

Cited by 110 publications

References 70 publications

Labile C dynamics reflect soil organic carbon sequestration capacity: Understory plants drive topsoil C process in subtropical forests

Labile C dynamics reflect soil organic carbon sequestration capacity: Understory plants drive topsoil C process in subtropical forests

Synthesis of Climate, Soil Factors, and Nitrogen Management Practices Affecting the Responses of Wheat Productivity and Nitrogen Use Efficiency to Nitrogen Fertilizer in China

Effects of long-term nitrogen addition on soil respiration and its components in a boreal forest

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