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Response of soil respiration and ecosystem carbon budget to vegetation removal in Eucalyptus plantations with contrasting ages.

Wu J, Liu Z, Huang G, Chen D, Zhang W, Shao Y, Wan S, Fu S - Sci Rep (2014)

Bottom Line: The net ecosystem production was approximately three times greater in the 2-year-old plantations (13.4 t C ha(-1) yr(-1)) than in the 24-year-old plantations (4.2 t C h(-1) yr(-1)).Our findings confirm the ecological importance of understory plants in subtropical plantations based on the 2 years of data.These results also indicate that Eucalyptus plantations in China may be an important carbon sink due to the large plantation area.

View Article: PubMed Central - PubMed

Affiliation: Institute of Ecology and Environmental Science, Nanchang Institute of Technology, Nanchang 330099, China.

ABSTRACT
Reforested plantations have substantial effects on terrestrial carbon cycling due to their large coverage area. Although understory plants are important components of reforested plantations, their effects on ecosystem carbon dynamics remain unclear. This study was designed to investigate the effects of vegetation removal/understory removal and tree girdling on soil respiration and ecosystem carbon dynamics in Eucalyptus plantations of South China with contrasting ages (2 and 24 years old). We conducted a field manipulation experiment from 2008 to 2009. Understory removal reduced soil respiration in both plantations, whereas tree girdling decreased soil respiration only in the 2-year-old plantations. The net ecosystem production was approximately three times greater in the 2-year-old plantations (13.4 t C ha(-1) yr(-1)) than in the 24-year-old plantations (4.2 t C h(-1) yr(-1)). The biomass increase of understory plants was 12.6 t ha(-1) yr(-1) in the 2-year-old plantations and 2.9 t ha(-1) yr(-1) in the 24-year-old plantations, accounting for 33.9% nd 14.1% of the net primary production, respectively. Our findings confirm the ecological importance of understory plants in subtropical plantations based on the 2 years of data. These results also indicate that Eucalyptus plantations in China may be an important carbon sink due to the large plantation area.

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Soil organic carbon (a), plant biomass carbon (b), litter carbon (c), and total carbon (d) in the 2-year-old and 24-year-old plantations.Values shown are the mean ± 1 SE; n = 3. Within each panel, means with different letters are significantly different (P < 0.05).
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f3: Soil organic carbon (a), plant biomass carbon (b), litter carbon (c), and total carbon (d) in the 2-year-old and 24-year-old plantations.Values shown are the mean ± 1 SE; n = 3. Within each panel, means with different letters are significantly different (P < 0.05).

Mentions: From 2008 to 2009, increases in the diameter at breast height (DBH), coarse root biomass, and understory biomass were greater for the 2-year-old plantations than for the 24-year-old plantations (Table 2). The net primary production (NPP) was greater for the 2-year-old plantations (1717.4 ± 123.11 g C m−2 yr−1) than for the 24-year-old plantations (924.24 ± 62.48 g C m−2 yr−1). The increase in understory plant biomass contributed 33.9% ± 0.08 to the NPP in the 2-year-old plantations and 14.1% ± 0.02 to the NPP in the 24-year-old plantations. The NEP values were consistent with the NPP values and were 1337.30 ± 54.89 g C m−2 yr−1 in the 2-year-old plantations and 420.15 ± 120.75 g C m−2 yr−1 in the 24-year-old plantations (Table 2). The plant biomass was greater in the 24-year-old plantations than in the 2-year-old plantations (P < 0.01), but soil organic carbon and floor litter carbon did not differ between the young and old plantations (Figure 3). The total carbon storage also did not differ between the 2-year-old plantations and the 24-year-old plantations (P = 0.16, Figure 3d), with values of 21.2 ± 0.98 and 24.4 ± 1.51 kg C m−2 yr−1, respectively. Compared with other dominant forest types in China, the NPP and NEP of Eucalyptus forests were significantly higher than the other forest types and the average values for China's forest ecosystems (Table 3).


Response of soil respiration and ecosystem carbon budget to vegetation removal in Eucalyptus plantations with contrasting ages.

Wu J, Liu Z, Huang G, Chen D, Zhang W, Shao Y, Wan S, Fu S - Sci Rep (2014)

Soil organic carbon (a), plant biomass carbon (b), litter carbon (c), and total carbon (d) in the 2-year-old and 24-year-old plantations.Values shown are the mean ± 1 SE; n = 3. Within each panel, means with different letters are significantly different (P < 0.05).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4151106&req=5

f3: Soil organic carbon (a), plant biomass carbon (b), litter carbon (c), and total carbon (d) in the 2-year-old and 24-year-old plantations.Values shown are the mean ± 1 SE; n = 3. Within each panel, means with different letters are significantly different (P < 0.05).
Mentions: From 2008 to 2009, increases in the diameter at breast height (DBH), coarse root biomass, and understory biomass were greater for the 2-year-old plantations than for the 24-year-old plantations (Table 2). The net primary production (NPP) was greater for the 2-year-old plantations (1717.4 ± 123.11 g C m−2 yr−1) than for the 24-year-old plantations (924.24 ± 62.48 g C m−2 yr−1). The increase in understory plant biomass contributed 33.9% ± 0.08 to the NPP in the 2-year-old plantations and 14.1% ± 0.02 to the NPP in the 24-year-old plantations. The NEP values were consistent with the NPP values and were 1337.30 ± 54.89 g C m−2 yr−1 in the 2-year-old plantations and 420.15 ± 120.75 g C m−2 yr−1 in the 24-year-old plantations (Table 2). The plant biomass was greater in the 24-year-old plantations than in the 2-year-old plantations (P < 0.01), but soil organic carbon and floor litter carbon did not differ between the young and old plantations (Figure 3). The total carbon storage also did not differ between the 2-year-old plantations and the 24-year-old plantations (P = 0.16, Figure 3d), with values of 21.2 ± 0.98 and 24.4 ± 1.51 kg C m−2 yr−1, respectively. Compared with other dominant forest types in China, the NPP and NEP of Eucalyptus forests were significantly higher than the other forest types and the average values for China's forest ecosystems (Table 3).

Bottom Line: The net ecosystem production was approximately three times greater in the 2-year-old plantations (13.4 t C ha(-1) yr(-1)) than in the 24-year-old plantations (4.2 t C h(-1) yr(-1)).Our findings confirm the ecological importance of understory plants in subtropical plantations based on the 2 years of data.These results also indicate that Eucalyptus plantations in China may be an important carbon sink due to the large plantation area.

View Article: PubMed Central - PubMed

Affiliation: Institute of Ecology and Environmental Science, Nanchang Institute of Technology, Nanchang 330099, China.

ABSTRACT
Reforested plantations have substantial effects on terrestrial carbon cycling due to their large coverage area. Although understory plants are important components of reforested plantations, their effects on ecosystem carbon dynamics remain unclear. This study was designed to investigate the effects of vegetation removal/understory removal and tree girdling on soil respiration and ecosystem carbon dynamics in Eucalyptus plantations of South China with contrasting ages (2 and 24 years old). We conducted a field manipulation experiment from 2008 to 2009. Understory removal reduced soil respiration in both plantations, whereas tree girdling decreased soil respiration only in the 2-year-old plantations. The net ecosystem production was approximately three times greater in the 2-year-old plantations (13.4 t C ha(-1) yr(-1)) than in the 24-year-old plantations (4.2 t C h(-1) yr(-1)). The biomass increase of understory plants was 12.6 t ha(-1) yr(-1) in the 2-year-old plantations and 2.9 t ha(-1) yr(-1) in the 24-year-old plantations, accounting for 33.9% nd 14.1% of the net primary production, respectively. Our findings confirm the ecological importance of understory plants in subtropical plantations based on the 2 years of data. These results also indicate that Eucalyptus plantations in China may be an important carbon sink due to the large plantation area.

Show MeSH
Related in: MedlinePlus