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Differences in Fine-Root Biomass of Trees and Understory Vegetation among Stand Types in Subtropical Forests.

Fu X, Wang J, Di Y, Wang H - PLoS ONE (2015)

Bottom Line: Low basal area did not correlate with low total fine-root biomass in the single-species stands.The mixed stands also did not yield higher total fine-root biomasses.This study suggests that the variation of total fine-root biomass across stand types not only was associated with the characteristics of trees, but also may be highly dependent on the understory layer.

View Article: PubMed Central - PubMed

Affiliation: Qianyanzhou Ecological Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.

ABSTRACT
Variation of total fine-root biomass among types of tree stands has previously been attributed to the characteristics of the stand layers. The effects of the understory vegetation on total fine-root biomass are less well studied. We examined the variation of total fine-root biomass in subtropical tree stands at two sites of Datian and Huitong in China. The two sites have similar humid monsoon climate but different soil organic carbon. One examination compared two categories of basal areas (high vs. low basal area) in stands of single species. A second examination compared single-species and mixed stands with comparable basal areas. Low basal area did not correlate with low total fine-root biomass in the single-species stands. The increase in seedling density but decrease in stem density for the low basal area stands at Datian and the quite similar stand structures for the basal-area contrast at Huitong helped in the lack of association between basal area and total fine-root biomass at the two sites, respectively. The mixed stands also did not yield higher total fine-root biomasses. In addition to the lack of niche complementarity between tree species, the differences in stem and seedling densities and the belowground competition between the tree and non-tree species also contributed to the similarity of the total fine-root biomasses in the mixed and single-species stands. Across stand types, the more fertile site Datian yielded higher tree, non-tree and total fine-root biomasses than Huitong. However, the contribution of non-tree fine-root biomass to the total fine-root biomass was higher at Huitong (29.4%) than that at Datian (16.7%). This study suggests that the variation of total fine-root biomass across stand types not only was associated with the characteristics of trees, but also may be highly dependent on the understory layer.

No MeSH data available.


Related in: MedlinePlus

The FRBs of (a) tree and (b) non-tree species along the soil profile at the two sites.Data was the mean value across three stand types at each site. Error bar represents one standard error of the mean. Different upper-case letters denote significant differences among soil depths within sites ((b) Datian: F = 13.126, P<0.001; Huitong: F = 7.869, P = 0.001). Different lower-case letters denote significant differences between sites within soil depths ((a) 0–10 cm: t = 6.420, P<0.001; 10–20 cm: t = 9.782, P<0.001; 20–40 cm: t = 9.176, P<0.001; (b) 10–20 cm: t = 4.462, P<0.001; 20–40 cm: t = 2.265, P<0.031).
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pone.0128894.g004: The FRBs of (a) tree and (b) non-tree species along the soil profile at the two sites.Data was the mean value across three stand types at each site. Error bar represents one standard error of the mean. Different upper-case letters denote significant differences among soil depths within sites ((b) Datian: F = 13.126, P<0.001; Huitong: F = 7.869, P = 0.001). Different lower-case letters denote significant differences between sites within soil depths ((a) 0–10 cm: t = 6.420, P<0.001; 10–20 cm: t = 9.782, P<0.001; 20–40 cm: t = 9.176, P<0.001; (b) 10–20 cm: t = 4.462, P<0.001; 20–40 cm: t = 2.265, P<0.031).

Mentions: Across stand types, Datian and Huitong had similar fine root distribution along the soil profile (Fig 4). The tree FRB remained stable along the soil profile, however, the non-tree FRB concentrated in the 0–10 cm layer. Compared with Huitong, Datian had higher tree FRB along the entire soil profile but showed similar non-tree FRB at the 0–10 cm depth.


Differences in Fine-Root Biomass of Trees and Understory Vegetation among Stand Types in Subtropical Forests.

Fu X, Wang J, Di Y, Wang H - PLoS ONE (2015)

The FRBs of (a) tree and (b) non-tree species along the soil profile at the two sites.Data was the mean value across three stand types at each site. Error bar represents one standard error of the mean. Different upper-case letters denote significant differences among soil depths within sites ((b) Datian: F = 13.126, P<0.001; Huitong: F = 7.869, P = 0.001). Different lower-case letters denote significant differences between sites within soil depths ((a) 0–10 cm: t = 6.420, P<0.001; 10–20 cm: t = 9.782, P<0.001; 20–40 cm: t = 9.176, P<0.001; (b) 10–20 cm: t = 4.462, P<0.001; 20–40 cm: t = 2.265, P<0.031).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4457824&req=5

pone.0128894.g004: The FRBs of (a) tree and (b) non-tree species along the soil profile at the two sites.Data was the mean value across three stand types at each site. Error bar represents one standard error of the mean. Different upper-case letters denote significant differences among soil depths within sites ((b) Datian: F = 13.126, P<0.001; Huitong: F = 7.869, P = 0.001). Different lower-case letters denote significant differences between sites within soil depths ((a) 0–10 cm: t = 6.420, P<0.001; 10–20 cm: t = 9.782, P<0.001; 20–40 cm: t = 9.176, P<0.001; (b) 10–20 cm: t = 4.462, P<0.001; 20–40 cm: t = 2.265, P<0.031).
Mentions: Across stand types, Datian and Huitong had similar fine root distribution along the soil profile (Fig 4). The tree FRB remained stable along the soil profile, however, the non-tree FRB concentrated in the 0–10 cm layer. Compared with Huitong, Datian had higher tree FRB along the entire soil profile but showed similar non-tree FRB at the 0–10 cm depth.

Bottom Line: Low basal area did not correlate with low total fine-root biomass in the single-species stands.The mixed stands also did not yield higher total fine-root biomasses.This study suggests that the variation of total fine-root biomass across stand types not only was associated with the characteristics of trees, but also may be highly dependent on the understory layer.

View Article: PubMed Central - PubMed

Affiliation: Qianyanzhou Ecological Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.

ABSTRACT
Variation of total fine-root biomass among types of tree stands has previously been attributed to the characteristics of the stand layers. The effects of the understory vegetation on total fine-root biomass are less well studied. We examined the variation of total fine-root biomass in subtropical tree stands at two sites of Datian and Huitong in China. The two sites have similar humid monsoon climate but different soil organic carbon. One examination compared two categories of basal areas (high vs. low basal area) in stands of single species. A second examination compared single-species and mixed stands with comparable basal areas. Low basal area did not correlate with low total fine-root biomass in the single-species stands. The increase in seedling density but decrease in stem density for the low basal area stands at Datian and the quite similar stand structures for the basal-area contrast at Huitong helped in the lack of association between basal area and total fine-root biomass at the two sites, respectively. The mixed stands also did not yield higher total fine-root biomasses. In addition to the lack of niche complementarity between tree species, the differences in stem and seedling densities and the belowground competition between the tree and non-tree species also contributed to the similarity of the total fine-root biomasses in the mixed and single-species stands. Across stand types, the more fertile site Datian yielded higher tree, non-tree and total fine-root biomasses than Huitong. However, the contribution of non-tree fine-root biomass to the total fine-root biomass was higher at Huitong (29.4%) than that at Datian (16.7%). This study suggests that the variation of total fine-root biomass across stand types not only was associated with the characteristics of trees, but also may be highly dependent on the understory layer.

No MeSH data available.


Related in: MedlinePlus