Leaf litter contributes more to soil organic carbon than fine roots in two 10-year-old subtropical plantations

Cao, Jianbo; He, Xinxing; Chen, Yuanqi; Chen, Yuping; Zhang, Yanju; Yu, Shiqin; Zhou, Lixia; Liu, Zhanfeng; Zhang, Chenlu; Fu, Shenglei

doi:10.1016/j.scitotenv.2019.135341

Cited by 53 publications

(34 citation statements)

References 66 publications

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“…The SOC differences among three water levels were caused by different soil mineralization in different environments. Soil mineralization in aerobic environment (-25 cm) was significantly higher than that in the flooded environment (0 cm, +25 cm) (Qiu et al, 2018), so the SOC at -25 cm water level was lower than the other two water levels. To avoid confusion, we have added the baseline SOC (63.32g kg-1) in section 2.2 in line 10.…”

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confidence: 81%

“…Use of the most up-to-date sources and an accurate reflection of those sources adds value to the manuscript. I recommend adding a citation such as (Kayranli et al 2010), which could also be useful in your discussion considering what happens to the SOC after it is leached from the litter into the soil. Response 2.3 We are sorry for the mistake and thank the reviewer very much for the commendation and suggestion.…”

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confidence: 99%

“…Response 2.3 We are sorry for the mistake and thank the reviewer very much for the commendation and suggestion. We have add the value into the manuscript, and cited the references (Kayranli C2 et al, 2010;Kochy et al, 2015). The sentences have been rephrased as follows: Wetlands are important terrestrial carbon pools.…”

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Dou¹

2020

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Comment 2.1 Line 20 and 46: I recommend including (Cao et al. 2020), and references therein, that address aboveground litter decomposition on SOC pools. Response 2.1 Thank you for your recommendation, we had cited (Bowden et al., 2014; Cao et al., 2020) in the revised manuscript in line 46. Comment 2.2 Line 30: The SOC increase due to litter application (Figure 5d) appears to be calculated from Figure 5a, but I could not reconcile the value for-25 cm. While Figure 5 does seem to support that litter increases SOC, I have two concerns about this presentation. First, the differences in Figure 5a for the 0 cm water levels is labelled as significant, but the error bars clearly C1

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confidence: 81%

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2020

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“…Currently, China contains the largest land mass of plantations in the world (~69 million ha in 2013) 11 . An estimated 80% of the increase in the national C sink can be attributed to forest plantations, with those in southern China representing 65% of the national C sink 12 . Eucalyptus spp.…”

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Improving understanding of carbon stock characteristics of Eucalyptus and Acacia trees in southern China through litter layer and woody debris

Zhang

Jiang

Song

et al. 2020

Sci Rep

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Surveying the quality and quantity of carbon stock in litter layer and woody debris of Eucalyptus andAcacia plantations is critical in understanding their carbon pools. Here, the focus of the present study was on a number of Eucalyptus and Acacia plantations of different stand aged in the Pearl River Delta region of southern china. the plantation type proved to be a crucial driver of the carbon concentration in litter layer and woody debris, with Acacia exhibiting a superior ability to Eucalyptus to accumulate carbon with stand age in both these materials. the relative contribution of the litter layer and woody debris to the carbon stock of the ecosystem was also significantly higher under mature Acacia (8% and 7%, respectively) than that under mature Eucalyptus (4% and 1%, respectively). Most of the carbon stock within the litter layer was present in the leaf debris. the carbon stock in woody debris was mainly contained in the components within the 10-20 cm diameter class during the primary decay stage, represented as snags in middle-aged and mature Acacia, and as logs for mature Eucalyptus, respectively. The results indicate that both plantation type and stand age influence the characteristics of carbon stored in litter layer and woody debris significantly.

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“…Wang et al (2017) also found that aboveground and belowground litter contribute equally to soil CO2 emissions. Therefore, the study of root litter decomposition is essential for understanding the formation of soil organic matter and nutrient cycling in forest ecosystems (Cao et al 2020). Previous studies have involved the comparative study between root decomposition and aboveground litter decomposition (Urcelay et al 2011;Sun et al 2018).…”

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Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

et al. 2020

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Background: Microorganisms play a crucial role in litter decomposition in terrestrial ecosystems. However, it remains unclear, which effects of leaf litter and root species on bacterial community composition and diversity after one year's decomposition. Methods: The leaf and fine roots litters of Robinia pseudoacacia , Quercus acutissima , Pinus tabulaeformis and Pinus densiflora , which are the dominant afforestation species in Mount Tai, were analysed using the Nylon litterbag method and Illumina Miseq high-throughput sequencing for the amplification of bacterial 16S rRNA V4-V5. We measured the remaining litter mass and the bacterial community composition and assessed the effects of leaf and root litter species on the bacterial community after one-year decomposition periods.Results: (1) The remaining masses of leaf and fine roots litters of the four plant species were significantly influenced by organ type and species. The remaining mass of fine root litter was smaller than that of leaf litter for broad-leaved species, and the opposite result was found for coniferous species. (2) The observed species Chao1 and phylogenetic diversity values were significantly lower for leaf litters than for fine root litter. The community richness index was positively correlated with the C content, C:N and lignin content and negatively correlated with N:P, N content and P content. The bacterial community structure differed significantly among leaf and root litter decomposition for the four species ( p <0.05). The bacterial community structure in leaf litter was most highly correlated with the initial N content and N:P. The bacterial community structure in fine roots was most highly correlated with the lignin content. (3) The bacterial phyla Bacteroidetes , Acidobacteria and Gemmatimonadetes were significantly affected by litter and species type, and the relative abundances of Firmicutes and Chloroflexi were only affected by litter type. The relative abundances of Acidobacteria , Firmicutes and Chloroflexi in fine root litter were higher than those in leaf litter, while the opposite result was found for Bacteroidetes . The bacterial genera Burkholderia-Paraburkholderia , Sphingomonas and Mucilaginibacter were affected by litter type ( p <0.05). The relative abundance of Burkholderia-Paraburkholderia in fine root litter was higher than that in leaf litter, while the opposite result was found for Bradyrhizobium , Sphingomonas and Mucilaginibacter . Pearson correlation analysis showed that the average relative abundance of the dominant phyla and genera was affected by the initial litter properties, especially for Bacteroides , Acidobacteria , Burkholderia , and Sphingomonas . Conclusions: Litter type, interaction between litter type and species were important than species in shaping the bacterial diversity and community composition in decomposing litter. And this were affected by initial chemical properties of the litter.

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Leaf litter contributes more to soil organic carbon than fine roots in two 10-year-old subtropical plantations

Cited by 53 publications

References 66 publications

Response to specific comments

Response to specific comments

Improving understanding of carbon stock characteristics of Eucalyptus and Acacia trees in southern China through litter layer and woody debris

Leaf and Root Litter Species Identity Influences Bacterial Community Composition in Short-Term Litter Decomposition

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