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| Titel |
Vegetation in karst terrain of southwestern China allocates more biomass to roots |
| VerfasserIn |
J. Ni, D. H. Luo, J. Xia, Z. H. Zhang, G. Hu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 6, no. 3 ; Nr. 6, no. 3 (2015-07-02), S.799-810 |
| Datensatznummer |
250115495
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| Publikation (Nr.) |
 copernicus.org/se-6-799-2015.pdf |
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| Zusammenfassung |
| In mountainous areas of southwestern China, especially Guizhou province,
continuous, broadly distributed karst landscapes with harsh and fragile
habitats often lead to land degradation. Research indicates that vegetation
located in karst terrains has low aboveground biomass and land degradation
that reduces vegetation biomass, but belowground biomass measurements are rarely
reported. Using the soil pit method, we investigated the root biomass of
karst vegetation in five land cover types: grassland, grass–scrub tussock,
thorn–scrub shrubland, scrub–tree forest, and mixed evergreen and deciduous
forest in Maolan, southern Guizhou province, growing in two different
soil-rich and rock-dominated habitats. The results show that roots in karst
vegetation, especially the coarse roots, and roots in rocky habitats are
mostly distributed in the topsoil layers (89 % on the surface up to 20 cm
depth). The total root biomass in all habitats of all vegetation degradation
periods is 18.77 Mg ha−1, in which roots in rocky habitat have higher
biomass than in earthy habitat, and coarse root biomass is larger than
medium and fine root biomass. The root biomass of mixed evergreen and
deciduous forest in karst habitat (35.83 Mg ha−1) is not greater than
that of most typical, non-karst evergreen broad-leaved forests in
subtropical regions of China, but the ratio of root to aboveground biomass
in karst forest (0.37) is significantly greater than the mean ratio
(0.26 ± 0.07) of subtropical evergreen forests. Vegetation restoration
in degraded karst terrain will significantly increase the belowground carbon
stock, forming a potential regional carbon sink. |
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